SD341X flange expansion butterfly valve has the function of automatically compensating for the thermal expansion and contraction of the pipeline to facilitate loading and unloading, and is used for regulating the flow and carrying off the fluid on the industrial pipelines of petroleum, chemical industry, electric power, papermaking, water supply and drainage, and municipal construction with the temperature below 80℃ and the nominal pressure below 1.6MPa.
SD341X flanged telescopic butterfly valve is divided into three types
- A. Ordinary type: design and install according to the design specification of the expansion joint when selecting, if need to add limit bolt, please specify when purchasing.
- B. Fixed limit type: it can be retracted and limited, with the function of fixing the retracted part to prevent it from retracting. It is characterized by more functions and wider scope of application.
- C. Extended type: it is the ordinary type expansion butterfly valve expansion joint lengthening, so that its length in line with the length required by the user (excluding expansion), which is characterized by the transformation of the old pipeline, the original pipeline valves need to be upgraded, do not need to be the original pipeline valves on the connecting part of the cut, you can replace it. Extended selection should also be considered when adding limit measures, such as the need for limit please specify when purchasing.
Product Features
- The sealing part can be adjusted and replaced, and the sealing performance is reliable.
- Flexible design, light weight, labor-saving, rapid opening and closing.
- Expansion butterfly valve can not only compensate for the pipeline temperature difference shrinkage generated by thermal expansion and contraction of the function, but also for the maintenance of the valve installation and replacement to provide convenience.
Product Parameters
Product Model | SD341X-16Q |
Valve body material | Ductile Iron |
Valve plate material | Ductile Iron/304 Stainless Steel |
Rubber lining material | EPDM |
Nominal pressure | ≤1.6Mpa |
Applicable medium | Water, Gas, Oil, etc. |
Applicable temperature | ≤80°C |
Product Size Reference

Nominal Diameter | L | telescoping volume | D | n-φd |
DN50 | 145 | 15 | 125 | 4-19 |
DN65 | 160 | 20 | 145 | 4-19 |
DN80 | 170 | 25 | 160 | 8-19 |
DN100 | 185 | 25 | 180 | 8-19 |
DN125 | 190 | 30 | 210 | 8-19 |
DN150 | 210 | 30 | 240 | 8-22 |
DN200 | 220 | 35 | 295 | 12-22 |
DN250 | 240 | 35 | 355 | 12-28 |
DN300 | 260 | 40 | 410 | 12-28 |
DN350 | 275 | 40 | 470 | 16-28 |
DN400 | 290 | 40 | 525 | 16-31 |
DN450 | 310 | 45 | 585 | 20-31 |
DN500 | 330 | 55 | 650 | 20-34 |
DN600 | 350 | 55 | 770 | 20-37 |
DN700 | 405 | 55 | 840 | 24-37 |
DN800 | 435 | 55 | 950 | 24-40 |
DN900 | 485 | 65 | 1050 | 28-40 |
DN1000 | 760 | 125 | 1170 | 28-43 |
DN1200 | 820 | 125 | 1390 | 32-49 |












