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# Bolaikong Technology (Wuxi) Co., Ltd.: 本公司主导生产：球阀、蝶阀、闸阀、截止阀、止回阀、过滤器、水利控制阀、减压阀、平衡阀、调节阀、气动阀门、电动阀门等高、中、低压阀门。不断吸取国内外先进技术，产品结构合理，制造工艺独特精湛、规格齐全、质量可靠，广泛适用于石油、化工、天然气、金属冶炼、电力、印染、矿业、钢铁、纺织、食品饮料、环保、制药、造纸、高层建筑给排水工程市政工程等领域。

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## Posts
- [304 Stainless Steel Electric Thin-Body Wafer-Type Ball Valve Q971F-16P](https://www.bllyco.com/stainless-steel-electric-wafer-type-ball-valve-q971f-16p.html): The Q971F Electric Thin-Body Wafer-Type Ball Valve consists of an electric actuator and an ultra-slim ball valve. Compared to standard electric ball valves, it features a compact design, small size, and light weight. The short distance between the seat and the end flange minimizes material retention and ensures superior sealing performance. Typically, electric slim-profile wafer ball valves are suitable for applications with limited installation space and are widely used in automatic control systems across industries such as chemicals, petroleum, pharmaceuticals, and light industry. The V-channel ball design, when paired with an electronic electric actuator, enables flow regulation. Additionally, the seat features an elastic sealing structure, ensuring reliable sealing and smooth opening and closing. The valve is equipped with a fire-resistant design, allowing for reliable operation and maintaining excellent sealing performance even in the event of a fire.
- [Cast Steel Electric High-Performance Butterfly Valve D972F-16C](https://www.bllyco.com/high-performance-cast-steel-electric-butterfly-valve-d972f-16c.html): The D972F Electric High-Performance Butterfly Valve is suitable for applications involving frequent opening and closing cycles. Thanks to its excellent sealing performance, long service life, and sleek design, it has successfully replaced traditional butterfly valves, ball valves, and gate valves in numerous applications. It is used in: medium-temperature water systems, compressed air systems, vacuum systems, corrosive media, and olefin media. The electric high-performance butterfly valve features a double-offset design and utilizes a variety of materials, including those compliant with NACE standards and resistant to erosion. The valve offers reliable sealing performance, a wide range of operating conditions, low operating torque, a long service life, and safety features for fire prevention in special operating conditions. It is widely applicable for common media such as water, gas, and oil, as well as industrial media in the food and pharmaceutical sectors, and corrosive media in the chemical industry.
- [304 Stainless Steel Electric High-Performance Butterfly Valve D972F-16P](https://www.bllyco.com/stainless-steel-electric-high-performance-butterfly-valve-d972f-16p.html): The D972F Electric High-Performance Butterfly Valve is suitable for applications involving frequent opening and closing cycles. Thanks to its excellent sealing performance, long service life, and sleek design, it has successfully replaced traditional butterfly valves, ball valves, and gate valves in numerous applications. It is used in: medium-temperature water systems, compressed air systems, vacuum systems, corrosive media, and olefin media. The electric high-performance butterfly valve features a double-offset design and utilizes a variety of materials, including those compliant with NACE requirements and resistant to erosion. The valve offers reliable sealing performance, broad operating conditions, low operating torque, a long service life, and safety features for fire prevention in special operating conditions. It is widely applicable for common media such as water, gas, and oil, as well as industrial media in the food and pharmaceutical sectors, and corrosive media in the chemical industry.
- [304 Stainless Steel Electric Fluorine Lined Flanged Ball Valve Q941F46-16P](https://www.bllyco.com/stainless-steel-electric-actuated-fluorinated-lined-flanged-ball-valve-q941f46-16p.html): The Q941F46-16P Electric Fluorine Lined Flanged Ball Valve is a 90° rotary ball valve characterized by excellent sealing performance, high flow capacity, low flow resistance, simple structure, easy maintenance, and a long service life. Both the valve body and the ball are lined with corrosion- and aging-resistant polyvinylidene fluoride (F46) using a high-pressure injection molding process, ensuring reliable corrosion resistance and sealing performance. It is widely used in industrial sectors such as chemicals, petroleum, metallurgy, and pharmaceuticals to regulate or shut off highly corrosive media such as acids and alkalis during production processes, and demonstrates significant effectiveness in water treatment process control.
- [304 Stainless Steel Electric Hard-Seal Flanged Ball Valve Q941H-16P](https://www.bllyco.com/stainless-steel-electric-hard-sealed-flanged-ball-valve-q941h-16p.html): The Q941H Electric Hard-Seal Flanged Ball Valve is suitable for on/off and regulating applications. The ball valve is directly connected to the actuator. Electric metal-sealed ball valves are primarily suitable for operating conditions with temperatures ≤325℃. Electric metal-sealed ball valves are mainly divided into two sealing configurations: single-direction sealing and double-direction sealing. Single-direction sealing: Sealing is only effective in the specified direction, as indicated on the valve. Double-direction sealing: Sealing is effective in both directions. The structural types of electric hard-sealed ball valves include floating ball and fixed ball designs. Connection types include flanged, welded, and threaded connections. The electric actuator features a built-in servo system, eliminating the need for a separate servo amplifier. It can be controlled by inputting a 4–20 mA signal and connecting to a 220 V AC or 380 V AC power supply. Electric hard-seal ball valves offer advantages such as simple wiring, compact design, small dimensions, light weight, low resistance, and stable operation.
- [Cast Steel Electric Hard-Seal Flanged Ball Valve Q941H-16C](https://www.bllyco.com/cast-steel-electric-hard-sealed-flanged-ball-valve-q941h-16c.html): The Q941H Electric Hard-Seal Flanged Ball Valve is suitable for on/off and control applications. The ball valve is directly connected to the actuator. Electric metal-sealed ball valves are primarily suitable for operating conditions with temperatures ≤325℃. Electric metal-sealed ball valves are mainly divided into two sealing configurations: single-direction sealing and double-direction sealing. Single-direction sealing: Sealing is only effective in the specified direction, as indicated on the valve. Double-direction sealing: Sealing is effective in both directions. The structural types of electric hard-sealed ball valves include floating ball and fixed ball designs. Connection types include flanged, welded, and threaded connections. The electric actuator features a built-in servo system, eliminating the need for a separate servo amplifier. It can be controlled by inputting a 4–20 mA signal and connecting to a 220 V AC or 380 V AC power supply. Electric metal-sealed ball valves offer advantages such as simple wiring, compact design, small dimensions, light weight, low resistance, and stable operation.
- [Cast Steel Electric Triple-Eccentric Hard-Seal Butterfly Valve D943H-16C](https://www.bllyco.com/cast-steel-electric-triple-eccentric-hard-seal-butterfly-valve-d943h-16c.html): The D943H/W Electric Triple-Eccentric Hard-Seal Butterfly Valve features a precision J-shaped elastic seal ring and a triple-offset multi-layer metal hard-seal structure. It is widely used in industrial pipelines in the metallurgy, power, petrochemical, water supply and drainage, and municipal construction sectors—where the medium temperature is ≤325℃—for regulating flow and shutting off fluid. This valve employs a triple-offset design, with both the seat and the disc sealing surfaces made of stainless steel with varying hardness levels, ensuring excellent corrosion resistance and a long service life. The valve features bidirectional sealing capability and complies with the national GB/T 13927-92 valve pressure testing standard.
- [304 Stainless Steel Electric Triple-Eccentric Hard-Seal Butterfly Valve D943W-16P](https://www.bllyco.com/stainless-steel-electric-triple-eccentric-hard-seal-butterfly-valve-d943w-16p.html): The D943H/W Electric Triple-Eccentric Hard-Seal Butterfly Valve features a precision J-shaped elastic seal ring and a triple-eccentric, multi-layer metal hard-seal structure. It is widely used in industrial pipelines in the metallurgy, power, petrochemical, water supply and drainage, and municipal construction sectors—where the medium temperature is ≤325℃—for regulating flow and shutting off fluid. This valve employs a triple-offset design, with both the seat and the disc sealing surfaces made of stainless steel with varying hardness levels, ensuring excellent corrosion resistance and a long service life. The valve features bidirectional sealing capability and complies with the national GB/T 13927-92 standard for valve pressure testing.
- [Cast Steel Electric Triple-Eccentric Hard-Seal Butterfly Valve D973H-16C](https://www.bllyco.com/cast-steel-electric-triple-eccentric-hard-seal-butterfly-valve-d973h-16c.html): The D973H/W Electric Triple-Eccentric Hard-Seal Butterfly Valve features a precision J-shaped elastic seal ring and a triple-eccentric, multi-layer metal hard-seal structure. It is widely used in industrial pipelines in the metallurgy, power, petrochemical, water supply and drainage, and municipal construction sectors—where the medium temperature is ≤325℃—for regulating flow and shutting off fluid. This valve employs a triple-offset design, with both the seat and the disc sealing surfaces made of stainless steel with varying hardness levels, ensuring excellent corrosion resistance and a long service life. The valve features bidirectional sealing capability and complies with the national GB/T 13927-92 valve pressure testing standard.
- [304 Stainless Steel Electric Triple-Eccentric Hard-Seal Butterfly Valve D973W-16P](https://www.bllyco.com/stainless-steel-electric-triple-eccentric-hard-seal-butterfly-valve-d973w-16p.html): The D973H/W Electric Triple-Eccentric Hard-Seal Butterfly Valve features a precision J-shaped elastic seal ring and a triple-eccentric, multi-layer metal hard-seal structure. It is widely used in industrial pipelines in the metallurgy, power, petrochemical, water supply and drainage, and municipal construction sectors—where the medium temperature is ≤325℃—for regulating flow and shutting off fluid. This valve employs a triple-offset design, with both the seat and the disc sealing surfaces made of stainless steel with varying hardness levels, ensuring excellent corrosion resistance and a long service life. The valve features bidirectional sealing capability and complies with the national GB/T 13927-92 valve pressure testing standard.
- [304 Stainless Steel Dual-Gauge Adjustable Pressure Reducing Valve YZ11X-16P](https://www.bllyco.com/stainless-steel-dual-gauge-adjustable-pressure-reducing-valve-yz11x-16p.html): The YZ11X stainless steel Dual-Gauge Adjustable Pressure Reducing Valve is a direct-acting diaphragm pressure reducing valve, representing an improved version of the original model of the same type. It consists primarily of a diaphragm, valve disc, spring, and other components. The diaphragm senses changes in downstream pressure to drive the valve disc up or down, thereby adjusting the valve opening to achieve pressure reduction and stabilization. This ensures more uniform water pressure distribution, prevents overpressure in certain supply lines, and optimizes water supply zoning in high-rise buildings. It is primarily used in various building water systems, fire protection systems, central air conditioning systems, and heating systems.
- [304 Stainless Steel Single-Gauge Adjustable Pressure Reducing Valve YZ11X-16P](https://www.bllyco.com/stainless-steel-single-gauge-adjustable-pressure-reducing-valve-yz11x-16p.html): The YZ11X stainless steel Single-Gauge Adjustable Pressure Reducing Valve is a direct-acting diaphragm pressure reducing valve, representing an improved version of the original model of the same type. It consists primarily of a diaphragm, valve disc, spring, and other components. The diaphragm senses changes in downstream pressure to drive the valve disc up or down, thereby adjusting the valve opening to achieve pressure reduction and stabilization. This ensures more uniform water pressure distribution, prevents overpressure in certain supply lines, and optimizes water supply zoning in high-rise buildings. It is primarily used in various building water systems, fire protection systems, central air conditioning systems, and heating systems.
- [304 Stainless Steel Piston-Type Pressure Reducing Valve YZ12X-16P](https://www.bllyco.com/stainless-steel-piston-type-pressure-reducing-valve-yz12x-16p.html): The YZ12X adjustable Piston-Type Pressure Reducing Valve is primarily used in various building water supply systems, fire protection systems, central air conditioning systems, and heating systems. It is designed for pressure reduction in branch pipes; once adjusted, it ensures more balanced pressure distribution and optimizes water supply efficiency in high-rise buildings. Its installation can replace pressure-zoning or variable-frequency water supply systems, thereby reducing pressure loads on water fixtures in lower zones, conserving water, and effectively preventing valve failures caused by debris blockages.
- [304 Stainless Steel Branch-Type Pressure Reducing Valve YZ11X-16P](https://www.bllyco.com/stainless-steel-branch-type-pressure-reducing-valve-yz11x-16p.html): The YZ11X stainless steel Branch-Type Pressure Reducing Valve is a direct-acting diaphragm pressure reducing valve, representing an improved version of the original model of the same type. It consists primarily of a diaphragm, valve disc, spring, and other components. The diaphragm senses changes in downstream pressure to drive the valve disc up or down, thereby adjusting the valve opening to achieve pressure reduction and stabilization. This ensures more uniform water pressure distribution, prevents overpressure in certain supply lines, and optimizes water supply zoning in high-rise buildings. It is primarily used in various building water systems, fire protection systems, central air conditioning systems, and heating systems.
- [Cast Steel ANSI Y-Filter GL41H-150LBC](https://www.bllyco.com/cast-steel-ansi-y-strainer-gl41h-150lbc.html): The GL41H ANSI Y-Filter complies with MFG standards, and its testing and inspection meet API 1598 requirements. Flange connection dimensions adhere to the ANSI B16.5 standard. Manufactured to a pressure rating of Class 150, it is primarily used to filter mechanical impurities from pipelines, thereby protecting pipeline fittings from wear and blockages. It features excellent flow capacity, low pressure drop, and high resistance to fouling.
- [Cast Steel Free Float Steam Trap CS11H-16C](https://www.bllyco.com/cast-steel-free-float-steam-trap-cs11h-16c.html): The CS11H female-threaded Free Float Steam Trap utilizes the density difference between condensate and steam. As the condensate level changes, the hollow float presses against the valve seat to open or close the valve, thereby trapping steam and draining condensate. This valve operates on the principle of buoyancy. The float rises and falls with changes in the condensate water level, automatically adjusting the opening of the control valve seat orifice to continuously discharge condensate. When condensate stops entering, the float drops to the bottom under its own weight, closing the drain seat. Since the drain seat orifice is located below the condensate water level, water and steam naturally separate, forming a water seal that prevents steam leakage.
- [Cast Steel ANSI Swing Check Valve H44H-150LBC](https://www.bllyco.com/cast-steel-ansi-swing-check-valve-h44h-150lbc.html): The H44H ANSI Swing Check Valve is manufactured in accordance with ANSI B16.34 and API 16D standards. It is designed for use in piping systems carrying water, oil, steam, and other media at Class 150 LB pressure, and is used to prevent backflow of the medium. It is widely used in various industries, including chemical, metallurgical, and pharmaceutical.
- [304 Stainless Steel Steam Pressure Reducing Valve Y43W-16P](https://www.bllyco.com/stainless-steel-steam-pressure-reducing-valve-y43w-16p.html): The Y43W Steam Pressure Reducing Valve sets the outlet pressure by adjusting the spring tension. It uses a diaphragm to sense changes in outlet pressure, and the pilot valve opens and closes to drive the piston, thereby regulating the flow area at the main valve’s throttling section to achieve pressure reduction and stabilization. This product is primarily used in steam piping systems to reduce and stabilize pressure.
- [304 Stainless Steel Ammonia Globe Valve J41B-25P](https://www.bllyco.com/stainless-steel-ammonia-shut-off-valve-j41b-25p.html): The J41B Ammonia Globe Valve features stable sealing performance, safe and reliable operation, strong corrosion resistance, no internal or external media leakage, and easy operation. It successfully addresses the challenges faced by standard valves used in chemical pipelines, such as poor corrosion resistance, susceptibility to body perforation, poor sealing performance, and frequent leakage. It is particularly suitable for the transmission of ammonia and natural gas in the chemical industry and meets the requirements for long-term reliable operation, including sealing performance, maintainability, and safety. It is widely used in industries such as freezing, refrigeration, chemicals, petroleum, food processing, smelting, and liquefied petroleum gas (LPG).
- [Cast Steel ANSI Bellows Globe Valve WJ41H-150LBC](https://www.bllyco.com/cast-steel-ansi-corrugated-tube-globe-valve-wj41h-150lbc.html): The WJ41H ANSI Bellows Globe Valve is suitable for flammable, explosive, toxic, highly permeable, radioactive, valuable, and high-purity media. Its key component, the metal bellows, is automatically roll-welded to the stem assembly at the bottom and to the connecting plate at the top, creating a metal barrier between the fluid medium and the atmosphere to ensure zero leakage from the stem.
- [Cast Steel ANSI Flanged Globe Valve J41H-150LBC](https://www.bllyco.com/cast-steel-ansi-flanged-globe-valve-j41h-150lbc.html): The J41H ANSI Flanged Globe Valve is designed and manufactured in accordance with the American National Standard ANSI B16.34 and is suitable for ANSI Class 150. It is designed for use in various piping systems with operating temperatures ranging from -29℃ to +250℃ to shut off or allow the flow of media within the pipeline. The body and bonnet of the J41H ANSI flanged globe valve feature excellent strength, rigidity, and flow capacity. The bonnet is designed with an upper seal seat, which ensures a more reliable packing seal when the valve is fully open and facilitates packing replacement. Packing and gaskets can be selected and configured according to actual operating conditions or user requirements, making the valve suitable for various pressure, temperature, and medium conditions with reliable sealing. Medium- and large-diameter models are equipped with roller bearings for smooth opening and closing.
- [Cast Steel ANSI Flanged Gate Valve Z41H-150LBC](https://www.bllyco.com/cast-steel-ansi-flanged-gate-valve-z41h-150lbc.html): The Z41H ANSI Flanged Gate Valve is suitable for use in various piping systems with an ANSI Class 150LB rating and operating temperatures below 250℃. It is designed to shut off or allow the flow of media within the pipeline. By selecting different materials, it can be used with a wide range of media, including water, steam, oil, nitric acid, acetic acid, strong oxidizing agents, and urea.
- [Brass Proportional Pressure Reducing Valve YB13X-16T](https://www.bllyco.com/brass-fixed-ratio-pressure-reducing-valve-yb13x-16t.html): The YB13X Proportional Pressure Reducing Valve is also an automatic valve. This valve utilizes the pressure difference created by the differing cross-sectional areas on either side of the internal floating piston to adjust the pressure conditions of the inlet and outlet water, thereby achieving pressure reduction. The YB13X proportional pressure reducing valve features an attractive design, wear- and corrosion-resistant internal components, precise proportional control, and smooth operation. It is widely used in domestic water supply and fire protection zone water supply systems.
- [304 Stainless Steel ANSI Flanged Ball Valve Q41F-150LBP](https://www.bllyco.com/stainless-steel-ansi-flanged-ball-valve-q41f-150lbp.html): How ANSI Flanged Ball Valve Work: The operating principle relies on rotating the valve core to open or close the valve. Ball valves are easy to operate, compact in size, and can be manufactured in very large diameters. They offer reliable sealing, a simple structure, and easy maintenance. Since the sealing surface and the ball surface are typically in a closed state, they are not easily eroded by the medium, making them widely used across various industries. Two-piece flanged ball valves offer unique advantages, such as frictionless operation, wear-resistant seals, and low torque requirements for opening and closing. These features allow for the use of smaller-sized actuators. They are widely used in petrochemical and municipal water supply and drainage applications with stringent operational requirements.
- [304 Stainless Steel Fluorine Lined Flanged Ball Valve Q41F46-16P](https://www.bllyco.com/stainless-steel-fluorinated-lined-flanged-ball-valve-q41f46-16p.html): The Q41F46 Fluorine Lined Flanged Ball Valve is designed for opening and closing control in pipelines carrying various highly corrosive media. Both the valve body cavity and the ball are lined with corrosion- and aging-resistant polyperfluoroethylene (F46) using a high-pressure injection molding process, ensuring reliable corrosion resistance and sealing performance. Widely used in industrial sectors such as chemicals, petroleum, metallurgy, and pharmaceuticals, this valve is used to regulate or shut off highly corrosive media such as acids and alkalis during production processes. Its performance is particularly effective in water treatment process control. It is currently one of the ideal choices among corrosion-resistant valve equipment.
- [304 Stainless Steel Hard-Seal Flanged Ball Valve Q41H-16P](https://www.bllyco.com/stainless-steel-hard-sealed-flanged-ball-valve-q41h-16p.html): The Q41H-16P Hard-Seal Flanged Ball Valve is designed for shutting off, distributing, and redirecting the flow of media. The valve features a leaf-spring-loaded metal-to-metal seal structure, ensuring smooth opening and closing even at high temperatures. The ball and seat undergo special hardening treatment to prevent scuffing of the sealing surfaces. It is widely used in urban construction, chemical, metallurgical, petroleum, pharmaceutical, food, beverage, and environmental protection industries.
- [Cast Iron Flanged Two-Way Plug Valve X43W-10](https://www.bllyco.com/cast-iron-flange-two-way-plug-valve-x43w-10.html): The X43W Flanged Two-Way Plug Valve features a straight-through design with a valve body cast from Gray cast iron (HT200). It is suitable for use with water, air, and oils at operating temperatures below 100℃. It is primarily used to open and close pipelines and equipment media; the plug rotates with the valve stem to perform the opening and closing actions. Small, packing-less plug valves are also known as “cocks.” The plug of a plug valve is typically conical (though cylindrical types also exist) and forms a sealing pair with the conical bore of the valve body.
- [Cast Iron Female Threaded Two-Way Plug Valve X13W-10](https://www.bllyco.com/cast-iron-internal-thread-two-way-plug-valve-x13w-10.html): The X13W Female Threaded Two-Way Plug Valve features a straight-through design with a valve body made of cast ron (HT200). It is suitable for use with water, air, and oils at operating temperatures below 100℃. It is primarily used to open and close pipelines and equipment media; the plug rotates with the valve stem to perform the opening and closing operations.
- [Cast Iron Female Threaded Globe Valve J11T-16](https://www.bllyco.com/cast-iron-female-threaded-globe-valve-j11t-16.html): The J11T Female Threaded Globe Valve is a commonly used shut-off valve primarily designed to open or close the flow of media in pipelines; it is generally not used for flow regulation. Globe valves are suitable for a wide range of pressures and temperatures, but are typically used in medium- and small-diameter pipelines.
- [Carbon Steel Grooved Water Hammer Arrester G9000X-16C](https://www.bllyco.com/carbon-steel-grooved-water-hammer-arrestor-g9000x-16c.html): The G9000X Grooved Water Hammer Arrester is a device designed to eliminate water hammer shock waves caused by various factors in pipelines, thereby protecting pipes and equipment from damage. Suitable for various water supply and drainage systems in industrial facilities, enterprises, high-rise buildings, power plants, and other settings, it utilizes the expansion and contraction of air in the upper chamber of the piston to cushion sudden shock waves, thereby reducing their intensity and effectively preventing equipment damage caused by massive water hammer forces. The device features a simple structure, high-quality materials, and a long service life.
- [Carbon Steel Fire Pressure Switch YLKG-16C](https://www.bllyco.com/carbon-steel-pressure-switch-for-fire-protection-ylkg-16c.html): A Fire Pressure Switch is a controllable switch that converts changes in water pressure into an electrical signal. It is an essential component of various automatic sprinkler systems and is commonly used in conjunction with wet alarm valves, deluge valves, and pre-action systems to transmit alarm signals. When activated, it triggers the fire pump control panel to start the fire pump. Fire pressure switches are typically installed in the alarm piping of wet alarm valve assemblies or in the piping networks of pre-action systems.
- [Brass Air Compressor Safety Valve A28X-16T](https://www.bllyco.com/safety-valve-for-brass-air-compressors-a28x-16t.html): The A28X Air Compressor Safety Valves are suitable for use as overpressure protection devices on equipment or pipelines carrying media such as Gases, oils, etc. at operating temperatures of ≤200℃.
- [Ductile Iron Telescopic Flanged Butterfly Valve SD341X-16Q](https://www.bllyco.com/ductile-iron-expandable-flanged-butterfly-valve-sd341x-16q.html): The SD341X Telescopic Flanged Butterfly Valve features automatic compensation for thermal expansion and contraction of pipelines, making it easy to install and remove. It is used in industrial pipelines—including those in the petroleum, chemical, power, paper, water supply and drainage, and municipal construction sectors—where temperatures do not exceed 80°C and nominal pressure does not exceed 1.6 MPa, to regulate flow and shut off fluid.
- [Cast Steel Pneumatic Triple-Eccentric Hard-Seal Butterfly Valve D643H-16C](https://www.bllyco.com/cast-steel-pneumatic-triple-eccentric-hard-seal-butterfly-valve-d643h-16c.html): The D643H/W Pneumatic Triple-Eccentric Hard-Seal Butterfly Valve consists of a pneumatic actuator and a triple-offset hard-seal butterfly valve. This valve features bidirectional sealing, requires low opening torque, and is flexible, convenient, and energy-efficient. Its three-dimensional offset structure ensures that the disc tightens further as it closes, providing reliable sealing performance and achieving a leak-free seal; There is virtually no friction between the disc and the seat during opening and closing, which reduces wear on the seat sealing surface and extends the service life of the butterfly valve. The seat seal employs a metal hard-seal structure, offering significantly higher temperature resistance than soft-seal butterfly valves and making it suitable for high-temperature media. The pneumatic actuator drives the butterfly valve to open and close rapidly, making it suitable for quick shut-off. It is equipped with a solenoid valve and limit switch accessories for convenient remote control. An electric valve positioner must be installed when proportional control is required.
- [304 Stainless Steel Pneumatic Triple-Eccentric Hard-Seal Butterfly Valve D643W-16P](https://www.bllyco.com/304-stainless-steel-pneumatic-triple-eccentric-hard-seal-butterfly-valve-d643w-16p.html): The D643H/W Pneumatic Triple-Eccentric Hard-Seal Butterfly Valve consists of a pneumatic actuator and a triple-offset hard-seal butterfly valve. This valve features bidirectional sealing, requires low opening torque, and is flexible, convenient, and energy-efficient. Its three-dimensional offset structure ensures that the disc tightens further as it closes, providing reliable sealing performance and achieving a leak-free seal; There is virtually no friction between the disc and the seat during opening and closing, which reduces wear on the seat sealing surface and extends the service life of the butterfly valve. The seat seal employs a metal hard-seal structure, offering significantly higher temperature resistance than soft-seal butterfly valves and making it suitable for high-temperature media. The pneumatic actuator drives the butterfly valve to open and close rapidly, enabling quick shutoff. It is equipped with a solenoid valve and limit switch accessories for convenient remote control. An electric valve positioner must be installed when proportional control is required.
- [Cast Steel Pneumatic Triple-Eccentric Hard-Seal Butterfly Valve D673H-16C](https://www.bllyco.com/cast-steel-pneumatic-triple-eccentric-hard-seal-butterfly-valve-d673h-16c.html): The D673H/W Pneumatic Triple-Eccentric Hard-Seal Butterfly Valve consists of a pneumatic actuator and a triple-offset hard-seal butterfly valve. This valve features bidirectional sealing, requires low opening torque, and is flexible, convenient, and energy-efficient. Its three-dimensional offset structure ensures that the disc tightens further as it closes, providing reliable sealing performance and achieving a leak-free seal; There is virtually no friction between the disc and the seat during opening and closing, which reduces wear on the seat sealing surface and extends the service life of the butterfly valve. The seat seal employs a metal hard-seal structure, offering significantly higher temperature resistance than soft-seal butterfly valves and making it suitable for high-temperature media. The pneumatic actuator drives the butterfly valve to open and close rapidly, making it suitable for quick shut-off applications. It is equipped with a solenoid valve and limit switch accessories for convenient remote control. An electric valve positioner must be installed when proportional control is required.
- [304 Stainless Steel Pneumatic Triple-Eccentric Hard-Seal Butterfly Valve D673W-16P](https://www.bllyco.com/stainless-steel-pneumatic-triple-eccentric-hard-seal-butterfly-valve-d673w-16p.html): The D673H/W Pneumatic Triple-Eccentric Hard-Seal Butterfly Valve consists of a pneumatic actuator and a triple-offset hard-seal butterfly valve. This valve features bidirectional sealing, low opening torque, and is flexible, convenient, and energy-efficient. Its three-dimensional offset structure ensures that the disc tightens further as it closes, providing reliable sealing performance and achieving a leak-free seal; There is virtually no friction between the disc and the seat during opening and closing, which reduces wear on the seat sealing surface and extends the service life of the butterfly valve. The seat seal employs a metal hard-seal structure, offering significantly higher temperature resistance than soft-seal butterfly valves and making it suitable for high-temperature media. The pneumatic actuator drives the butterfly valve to open and close rapidly, enabling quick shutoff. It is equipped with a solenoid valve and limit switch accessories for convenient remote control. An electric valve positioner must be installed when proportional control is required.
- [Cast Steel Natural Gas Flanged Globe Valve J41F-25C](https://www.bllyco.com/cast-steel-gas-flanged-globe-valve-j41f-25c.html): The J41F Natural Gas Flanged Globe Valve features stable sealing performance, safe and reliable operation, strong corrosion resistance, no internal or external media leakage, and easy operation. It successfully addresses the challenges faced by standard valves used in chemical pipelines, such as poor corrosion resistance, susceptibility to body perforation, poor sealing performance, and frequent leakage. It is particularly suitable for the transmission of ammonia and natural gas in the chemical industry and meets the requirements for long-term reliable operation, including sealing performance, maintainability, and safety. It is widely used in industries such as freezing, refrigeration, chemicals, petroleum, food processing, smelting, and liquefied petroleum gas.
- [The Role of Diaphragm Pump Safety Valve: Ensuring System Stability](https://www.bllyco.com/function-of-diaphragm-pump-safety-valve.html): This article systematically discusses the core functions, operating principles, selection criteria, and maintenance practices of safety valves for diaphragm pumps. As a critical overpressure protection device, the safety valve automatically opens to release excess pressure, effectively preventing equipment damage such as diaphragm rupture and pipe bursts, mitigating water hammer effects, and ensuring process stability as well as personnel and environmental safety. The article analyzes major valve types, such as spring-loaded and weight-loaded models, and emphasizes that selection requires comprehensive consideration of set pressure, flow capacity, material compatibility, and medium characteristics. Furthermore, by introducing typical application scenarios and combining installation and maintenance guidelines with troubleshooting procedures—supplemented by actual retrofit case studies—the article demonstrates the significant value of properly configuring and maintaining safety valves in enhancing system reliability, extending equipment lifespan, and reducing overall operational and maintenance costs.
- [What to Do If Your Electric Ball Valve Keeps Making Noise? Quick Troubleshooting Tips and Long-Term Solutions](https://www.bllyco.com/what-should-i-do-if-the-electric-ball-valve-keeps-making-noise.html): This article systematically outlines the diagnostic process and long-term management strategies for abnormal noise in electric ball valves. Regarding diagnosis, it proposes a five-step troubleshooting method: “auscultation and localization → power-off inspection → installation and alignment → lubrication and sealing → electrical troubleshooting,” emphasizing the combination of sound characteristics, manual testing, and instrument-based detection to ensure accurate diagnosis. For long-term management, the paper recommends establishing a regular maintenance schedule, optimizing spare parts management, promoting technological upgrades, and strengthening staff training to build a preventive maintenance system. The paper aims to help users transition from reactive repairs to proactive management, thereby thoroughly resolving noise issues in electric ball valves.
- [Choosing a Third-Party Valve Testing Organization: The Best Way to Ensure Safety and Quality](https://www.bllyco.com/select-a-third-party-valve-inspection-agency.html): As a critical component of industrial equipment, valves play a vital role in various production and transportation processes. Selecting a professional third-party valve testing organization is an effective way to ensure the quality, safety, and reliability of valves. This article will explore in depth the importance of third-party valve testing organizations and how to choose the right testing services to help businesses improve product quality and competitiveness.
- [Understanding the Differences Between Brass Gate Valve and Brass Globe Valve: Choosing the Right Valve Is Crucial](https://www.bllyco.com/analysis-of-the-differences-between-copper-gate-valves-and-copper-globe-valves.html): The selection of brass gate valves and brass globe valves is particularly important in piping systems, as each has distinct characteristics and applications. Understanding the differences between the two can help you make more informed decisions in practical applications, ensuring the system operates safely and efficiently.
- [Copper Ball Valve Size Chart: A Comprehensive Guide to Selection and Application](https://www.bllyco.com/copper-ball-valve-size-comparison-chart.html): Familiarize yourself with the brass ball valve size chart to easily select the correct specifications when purchasing brass ball valves, ensuring smooth plumbing installation and system operation. Master the sizing standards for brass ball valves to optimize your piping configuration and management.
- [Understanding Copper Ball Valve Models, Specifications, and Sizes: Selecting the Right Copper Ball Valve to Ensure Safe and Efficient Projects](https://www.bllyco.com/dimension-chart-for-brass-ball-valves.html): As an important control component commonly used in piping systems, brass ball valves are widely applied in water supply, heating, and gas systems. Understanding the models, specifications, dimensions, and selection criteria of brass ball valves helps users identify the most suitable product from a wide range of options, thereby enhancing the safety and efficiency of their projects.
- [Types of Valves in Municipal Water Supply Systems](https://www.bllyco.com/municipal-water-supply-system-valve-type.html): Detailed Explanation of Valves, Core Components of Municipal Water Supply Systems: Hydraulic control valves regulate water flow direction, flow rate, and pressure to ensure system stability; globe valves are used to shut off water flow, facilitating maintenance and emergency response; anti-contamination valves strictly prevent the intrusion of contaminants to ensure water quality safety; while relief valves and pressure reducing valves control water levels and reduce water pressure, respectively, to prevent equipment damage. This article outlines the functions and importance of these key valves, emphasizing that their proper selection and management are indispensable for ensuring the safe and stable operation of water supply systems.
- [Advantages of Cast Steel Butterfly Valve Over Cast Iron Butterfly Valve](https://www.bllyco.com/advantages-of-cast-steel-butterfly-valve-over-cast-iron-butterfly-valve.html): This article provides a comparative analysis of the key differences between cast steel butterfly valves and cast iron butterfly valves. Cast steel butterfly valves, made from high-strength carbon steel, offer significant advantages in terms of corrosion resistance, high-temperature and high-pressure performance, service life, and maintenance costs, making them particularly suitable for harsh operating conditions. Cast iron butterfly valves, while lower in cost, have inferior strength and corrosion resistance and are more suitable for water systems operating at normal temperatures and pressures. Engineering selection must be based on specific operating conditions, balancing performance and cost to ensure the safe and stable operation of the system.
- [Differences Between PTFE and EPDM Sealing Materials in Butterfly Valve](https://www.bllyco.com/the-butterfly-valve-seal-is-made-of-ptfe-and-epdm.html): This article compares the performance differences and application scenarios of two key sealing materials used in butterfly valves: PTFE (polytetrafluoroethylene) and EPDM (ethylene propylene diene monomer). PTFE is renowned for its exceptional chemical stability, corrosion resistance (resistance to acids, alkalis, and solvents), and low coefficient of friction, and is widely used in the chemical, petroleum, and pharmaceutical industries; however, it has relatively low mechanical strength and requires caution when used at high temperatures. EPDM, on the other hand, offers excellent weather resistance (resistance to aging, ozone, high temperatures, and moisture) and insulation properties, making it particularly suitable for outdoor piping, waterproofing, and electrical applications; however, its chemical stability is relatively weaker than that of PTFE. When selecting a material, the characteristics of both must be weighed against specific operating conditions (fluid properties and environmental conditions) to optimize the performance and service life of the butterfly valve.
- [The Difference Between Wafer-Type and Flanged Butterfly Valve](https://www.bllyco.com/the-difference-between-a-clamp-butterfly-valve-and-a-flanged-butterfly-valve.html): This article systematically analyzes the key differences between wafer-type butterfly valves and flanged butterfly valves. Wafer-type butterfly valves feature a lightweight and simple design; they are installed by clamping between pipe flanges, making them easy to install and remove. They are suitable for applications with limited space or those requiring frequent maintenance (such as ventilation and water treatment systems); Flange-mounted butterfly valves, on the other hand, utilize pre-fabricated flanges for a secure connection, offering superior sealing performance and exceptional high-pressure resistance, making them suitable for demanding industries such as petrochemicals and power generation. Each type has distinct strengths in terms of sealing performance, maintenance costs, and application scenarios, providing a critical reference for selecting industrial fluid control valves.
- [An Analysis of the Applications and Advantages of Soft-Seal Gate Valve](https://www.bllyco.com/analysis-of-the-use-and-advantages-of-soft-seal-gate-valves.html): This article provides a detailed overview of the core advantages and practical value of soft-seal gate valves. Their exceptional elastic sealing performance effectively prevents leaks, reduces energy consumption, and minimizes safety risks; their simple design, easy operation, and long maintenance intervals significantly reduce maintenance costs and downtime; and their excellent corrosion and wear resistance, combined with a long service life, make them suitable for harsh operating conditions and capable of substantially lowering operational costs for businesses. Soft-seal gate valves are essential equipment for enhancing the efficiency and safety of industrial piping systems.
- [Applications of Hard-Seal Butterfly Valve](https://www.bllyco.com/application-areas-of-hard-seated-butterfly-valves.html): Thanks to their simple structure, ease of operation, and excellent sealing performance, hard-seal butterfly valves have become essential fluid control equipment in harsh environments involving high temperatures, high pressures, and corrosive media. This article focuses on their widespread application in industrial sectors such as chemicals (precision control, corrosion resistance), oil and gas (high-pressure, high-temperature transportation and processing), as well as power generation, metallurgy, and papermaking (regulating media such as water, steam, gas, and pulp). These valves meet stringent requirements for stability and reliability, effectively enhancing production efficiency and safety.

## FAQ
- [What is a control valve? What are the characteristics of a control valve?](https://www.bllyco.com/faq/10049): A control valve is a type of valve used to regulate the flow or pressure of a medium. Since the flow or pressure of the medium affects certain control processes, control valves are typically operated by remote signals from independent devices such as electric, pneumatic, or pneumatic-hydraulic actuators.
- [Are pressure reducing valves for liquids the same as those for gases?](https://www.bllyco.com/faq/10048): Pressure reducing valves for liquids and those for gases have essentially the same basic design and operating principles, but their settings differ. Pressure reducing valves designed for gases cannot be used with liquids without being re-calibrated.
- [What is the pressure characteristic of a pressure reducing valve? What is the flow characteristic of a pressure reducing valve?](https://www.bllyco.com/faq/10047): The pressure characteristic of a pressure reducing valve refers to the functional relationship between the outlet pressure and the inlet pressure under steady-state flow conditions, when parameters such as flow rate remain constant.
- [What is the difference between a direct-acting pressure reducing valve and a pilot-operated pressure reducing valve?](https://www.bllyco.com/faq/10046): A direct-acting pressure reducing valve is a type of pressure reducing valve that uses changes in outlet pressure to directly control the movement of the valve disc.
- [What is a pressure reducing valve? What is the purpose of using a pressure reducing valve?](https://www.bllyco.com/faq/10045): A pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure through throttling by a closing element, and maintains the outlet pressure essentially constant by utilizing the energy of the medium itself when the inlet pressure and flow rate fluctuate.
- [What is a direct-acting safety valve? What is a pilot-operated safety valve?](https://www.bllyco.com/faq/10044): A direct-acting safety valve is a safety valve that uses a mechanical load, such as a weight, a lever-operated weight, or a spring, to counteract the force generated by the pressure of the medium beneath the disc.
- [Do spring-loaded safety valves with different pressure ratings require replacement of their springs? How many springs should typically be used in a PN16 spring-loaded safety valve? What are the specified pressure ranges?](https://www.bllyco.com/faq/10043): The springs in spring-loaded safety valves designed for different pressures must be replaced.
- [What is frequent tripping of a safety valve? What is flutter in a safety valve?](https://www.bllyco.com/faq/10042): Frequent fluttering of a safety valve refers to the rapid, abnormal back-and-forth movement of the valve disc, during which the disc comes into contact with the seat.
- [How is the relationship between the theoretical discharge capacity and the actual discharge capacity of a safety valve expressed?](https://www.bllyco.com/faq/10041): The theoretical discharge capacity of a safety valve is the calculated discharge capacity of an ideal nozzle with a flow passage cross-sectional area equal to that of the safety valve.
- [What is the disc area of a safety valve? What is the relationship between the disc area and the flow passage area of a safety valve?](https://www.bllyco.com/faq/10040): The orifice area of a safety valve refers to the area of the cylindrical or conical passage formed between the sealing surfaces of the disc and the seat when the disc lifts above the seat.
- [What is the difference between the reseating pressure and the sealing pressure of a safety valve?](https://www.bllyco.com/faq/10039): The reseating pressure of a safety valve refers to the static pressure at the inlet when the valve disc comes back into contact with the seat after the valve has discharged, i.e., when the lift is reduced to zero.
- [What is the difference between the opening pressure and the discharge pressure of a safety valve?](https://www.bllyco.com/faq/10038): The opening pressure of a safety valve refers to the inlet pressure at which the valve disc begins to lift under operating conditions; at this pressure, a measurable lift height begins, and the medium is discharged continuously in a manner that can be detected visually or audibly.
- [How can you tell the difference between a full-lift safety valve and a low-lift safety valve?](https://www.bllyco.com/faq/7298): Full-Lift Safety Valve:
- [What is a safety valve?](https://www.bllyco.com/faq/7297): A safety valve is an automatic valve that discharges a predetermined volume of fluid using the force of the medium itself, without any external force, to prevent the pressure within the system from exceeding a predetermined safety limit. Once the pressure returns to normal, the valve closes to prevent further discharge of the medium.
- [What is the load factor of a steam trap?](https://www.bllyco.com/faq/7296): The load factor of a steam trap refers to the percentage of the actual hot condensate discharge during the test period relative to the maximum hot condensate discharge at the test pressure.
- [What does the operating temperature of a steam trap refer to—under what conditions and at what location?](https://www.bllyco.com/faq/7295): The operating temperature of a steam trap refers to the temperature at the inlet of the steam trap under operating conditions.
- [What is the significance of backpressure in a steam trap? Is a high or low backpressure tolerance better? Why?](https://www.bllyco.com/faq/7294): The backpressure of a steam trap refers to the pressure at the outlet end of the steam trap under operating conditions.
- [What is subcooling? What is the difference between valve-open subcooling and valve-closed subcooling? Which one is greater?](https://www.bllyco.com/faq/7293): The absolute value of the difference between the condensate temperature and the saturated temperature at the corresponding pressure is the subcooling.
- [What is gauge pressure? What is absolute pressure? What is the relationship between gauge pressure and absolute pressure?](https://www.bllyco.com/faq/7292): Pressure measured relative to atmospheric pressure (set as 0) is called gauge pressure.
- [What is sensible heat? What is latent heat?](https://www.bllyco.com/faq/7291): Sensible heat:
- [When selecting a steam trap, why is it necessary to multiply the trap’s discharge capacity by a safety factor?](https://www.bllyco.com/faq/7290): For these two reasons, when selecting a steam trap, the trap’s discharge capacity should be multiplied by a safety factor.
- [What factors should be considered when selecting a steam trap?](https://www.bllyco.com/faq/7289): There are many factors to consider when selecting the right steam trap, but the main ones are as follows:
- [What is critical temperature? What is critical pressure?](https://www.bllyco.com/faq/7288): In the phase transition of water, a system in which water and water vapor coexist in equilibrium is called saturated. This saturated state has a critical point; the temperature at this critical point is called the critical temperature, which is 374.15 ℃.
- [What is the steam leakage rate of a steam trap? Why is the steam leakage rate used to evaluate the performance of a steam trap?](https://www.bllyco.com/faq/7287): The steam leakage rate of a steam trap is classified into two categories: under-load steam leakage rate and no-load steam leakage rate.
- [What is a steam trap? What are the key performance indicators for steam traps?](https://www.bllyco.com/faq/7286): A steam trap is a valve that automatically removes condensate from steam lines and steam-using equipment and prevents steam leaks.
- [Why are steel and cast iron plug valves not suitable for corrosive media?](https://www.bllyco.com/faq/7285): Because the contact area between the valve body and the plug of a plug valve is very large, rotating the plug generates significant torque. In this case, surface corrosion can quickly cause the sealing element to lose its seal, and increase the torque required to operate the plug valve.
- [What do national standards stipulate regarding the installation of ball valve stems?](https://www.bllyco.com/faq/7284): National Standard GB/T 12237, “Steel Ball Valves for the Petroleum, Petrochemical, and Related Industries,” stipulates that the ball valve stem shall be designed such that, under the pressure of the medium, the stem will not be forced out of the valve body even when the stem packing is removed (e.g., when the packing gland is removed).
- [How are single-seal butterfly valves and double-seal butterfly valves distinguished?](https://www.bllyco.com/faq/7283): Single-Seal Butterfly Valves
- [What is the relationship between the pivot pin and the sealing surface in a swing check valve?](https://www.bllyco.com/faq/7282): The horizontal projection of the pivot pin axis of a swing check valve is perpendicular to the axis of the valve body’s flow passage and forms an angle with the sealing surface.
- [What is the direction of flow for the medium in a globe valve?](https://www.bllyco.com/faq/7281): In a standard globe valve, the medium flows in from below the disc and out from above the disc. If the globe valve has a double disc, the medium flows in from above the disc and out from below the disc. Globe valves with a DN greater than 250 mm allow the medium to flow in from above the disc.
- [What should be considered when conducting performance tests on steel gate valves?](https://www.bllyco.com/faq/7280): When conducting performance tests on steel gate valves, care must be taken to ensure that no external forces are applied to either end of the valve that could affect leakage at the sealing surfaces.
- [What are the requirements of national standards regarding the installation of gate valve stem nuts?](https://www.bllyco.com/faq/7279): National Standard GB/T 12234, “Steel Gate Valves with Bolted Covers for the Oil and Gas Industry”, stipulates that the valve stem nut shall be installed from the top of the bracket, and the upper part of the gate valve stem nut shall be a polygonal cylinder with a keyway or a structure of equivalent strength connected to the handwheel. When the valve is open, the handwheel shall be removable without causing the valve stem and gate to drop to the closed position. If a threaded bearing gland is used, it shall be secured by spot welding or other methods.
- [For gate valves, what is a double-sided forced seal? What is a single-sided forced seal?](https://www.bllyco.com/faq/7278): Double-sided forced sealing in gate valves:
- [How many types of gate valves are there? How are they classified?](https://www.bllyco.com/faq/7277): Ⅰ.Classified into two categories based on gate plate construction
- [What are the specifications for the minimum valve stem diameter and the minimum valve stem diameter?](https://www.bllyco.com/faq/7276): The minimum stem diameter refers to the diameter of the portion of the stem that comes into contact with the packing. The minimum stem diameter refers to the diameter of the undercut on the stem threads.
- [What are the regulations regarding the painting of valve handles and handwheels?](https://www.bllyco.com/faq/7270): The paint on the handles and handwheels corresponds to the paint colors of the sealing surface materials; see the table below for details.
- [What are the specified directions for opening and closing general-purpose valves?](https://www.bllyco.com/faq/7269): The standard opening and closing directions for general-purpose valves are as follows: clockwise is closed, and counterclockwise is open.
- [What are the regulations regarding the labeling of general-purpose valves?](https://www.bllyco.com/faq/7268): The mandatory and optional markings for general-purpose valves are shown in the table below.
- [In the valve model designation system, how are the codes for sealing surfaces or lining materials specified?](https://www.bllyco.com/faq/7265): The material code for sealing surfaces machined directly from the valve body is denoted by “W”; see the table below for the codes of other materials.
- [What is the relationship between sealing pressure, specific sealing pressure, and allowable specific sealing pressure?](https://www.bllyco.com/faq/7262): For gate valves, globe valves, check valves, ball valves, and butterfly valves, the sealing pressure qMF must be less than the sealing pressure q, and the sealing pressure must be less than the allowable sealing pressure (i.e., qMF < q < ).
- [What are the test pressures for the body and seals of general-purpose valves?](https://www.bllyco.com/faq/7256): The test pressure for the body of general-purpose valves is 1.5 times the rated working pressure of the material at 38°C. The high-pressure seal test is conducted at 1.1 times the rated working pressure of the material at 38°C. Requirements for low-pressure seal tests vary by standard.
- [How are high-temperature valves, heat-resistant valves, low-temperature valves, and cryogenic valves distinguished?](https://www.bllyco.com/faq/7255)
- [How are the sizes of extra-large, large, medium, and small valves distinguished?](https://www.bllyco.com/faq/7254)
- [How are ultra-high-pressure, high-pressure, medium-pressure, and low-pressure valves classified by pressure?](https://www.bllyco.com/faq/7253)
- [What are the types of valves and their general classification?](https://www.bllyco.com/faq/7252): Classification of valves by application or primary structural features.
- [What are valve model numbers and what do they signify?](https://www.bllyco.com/faq/7250): Valve model numbers are composed of codes representing the valve type, actuation method, connection type, construction type, sealing surface material or lining material type, pressure rating or operating pressure at the specified temperature, and body material.
- [What is the nominal pipe size (NPS) of a valve?](https://www.bllyco.com/faq/7275): NPS：
- [What is the nominal pressure class of a valve?](https://www.bllyco.com/faq/7274): Class：
- [What is the nominal size (DN) of a valve?](https://www.bllyco.com/faq/7273): DN：
- [What is the nominal pressure (PN) of a valve?](https://www.bllyco.com/faq/7249): PN：

## 下载
- [Working and Test Pressures for Standard Pressure Class Valves as Specified in ASME B16.34‑2004](https://www.bllyco.com/download/7259): This standard specifies the specific test pressures for shell tests, high-pressure seal tests, and high-pressure upper seal tests for Class 150 to Class 2500.
- [GB/T 12221-2005 Structural Length of Metal Valves](https://www.bllyco.com/download/7245): This standard specifies the nominal lengths of flanged valves, welded-end valves, wafer-type valves, female-threaded valves, and male-threaded valves, as well as the permissible deviations for their dimensions.
- [GB/T 12238-2008 Flanged and Wafer-Type Butterfly Valves with Elastic Seals](https://www.bllyco.com/download/7233): This standard specifies the structural configurations, technical requirements, materials, test methods and inspection procedures, marking, painting, packaging, and storage and transportation of flanged and wafer-type elastic-seal butterfly valves.

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