Cast Steel Hydraulically Operated Normally Closed Steam Trap S7B41F-7C

Product Description

The S7B41F hydraulic normally closed steam trap is a non-leaking, high-efficiency, energy-saving steam trap that meets all performance requirements specified in national standards GB/T 12251-89 and ZBJ16007-90. This trap combines the advantages of inverted bucket and free-float designs; the float is the only moving part inside the body, ensuring a simple structure, stable and reliable operation, and excellent energy efficiency. It is widely used in steam distribution networks, heating equipment, air compressors, air dryers, and other related applications.

How It Works

When there is no condensate inside the valve, the float closes the valve tightly under the combined action of its own weight and the steam pressure in the system. When the condensate level rises to a certain height, the float rises in a controlled manner due to the buoyancy of the liquid, opening the valve to allow the condensate to drain out. When the water level drops to a certain point, the valve closes rapidly due to the force of the steam and the float’s own weight, while retaining a certain amount of water at the bottom of the valve to serve as a water seal.

Performance Features

1. Both the valve seat and the valve orifice are made of special materials that offer high hardness and wear resistance, and are equipped with cushioning components, resulting in a long service life. The national standard for mechanical steam traps specifies a service life of ≥8,000 hours; this valve has a service life exceeding 16,000 hours.
2. It features a dual-seal design: a valve seat seal and a water seal. Steam traps with other designs, both domestic and international, all have a certain steam leakage rate. The national standard permits a steam leakage rate of ≤3%, while this valve has a steam leakage rate of ≈0. This significantly reduces energy consumption and improves thermal efficiency.
3. With a high backpressure ratio of up to 99% and a subcooling of 0°C, it is even more suitable for the recovery and reuse of thermal energy. The national technical standard (ZBJ16007-90) stipulates that the backpressure ratio for mechanical steam traps must be ≥80%.
4. The correction factor—or safety factor—for condensate discharge is low, and the calculation is simple; generally, setting the correction factor to around 1.5 is sufficient, and no calculations by a professional thermal engineer are required.
5. The correction factor—or safety factor—for condensate discharge is low, and the calculation is simple; generally, setting the correction factor to around 1.5 is sufficient, and no calculations by a professional thermal engineer are required.
6. Condensate can be drained at atmospheric pressure, and the system continuously discharges condensate until the equipment is completely drained. This ensures that no condensate accumulates inside the equipment even when it is shut down, which helps maintain the equipment over the long term and prevents water hammer in the piping.
7. Installation is simple. By combining the bypass and steam lines into a single installation, user costs are reduced and the complex piping network is simplified.

Installation Instructions

1. A drain outlet that is essentially perpendicular to the pipe indicates that the arrows on the inlet and outlet should point in the same direction as the flow.
2. It should be installed at the lowest point of the steam and water system.
3. The operating pressure must not exceed the valve's specified maximum operating pressure.
4. Before installation, all debris must be removed from the piping to prevent it from entering the valve.
5. The bypass valve should be installed downstream of the steam trap to facilitate the removal of debris.
6. Please select the correct model based on the displacement chart.

Installation Schematic for Improving Steam Network Production Efficiency

Energy-Saving Benefits

The S7B41F-7C hydraulic normally closed steam trap has a maximum discharge capacity of 1,300 kg/h at 0.5 MPa. Its typical operating discharge rate is 60%, meaning it discharges 780 kg/h of condensate. Energy savings: 780 kg/h × 3% × 24 h (per day) × 30 days ≈ 16.8 metric tons of steam per month. According to statistics from relevant national authorities, the production cost of industrial steam nationwide in 2025 will be approximately 198 yuan per metric ton.

Conclusion: The S7B41F-7C hydraulic normally closed Steam Trap, operating at a pressure of 0.5 MPa, can save 3,326 RMB per month.

Product Specifications

Condensate Discharge Rate [Maximum Discharge Rate (kg/h) at Different Pressure Differences (MPa)]