The flanged soft-seal butterfly valve combines the stability of a flange connection with the excellent performance of a soft seal. It reliably connects to the pipeline via flanges at both ends of the valve body, and utilizes soft materials such as rubber and polytetrafluoroethylene (PTFE) to achieve a seal between the valve plate and the valve seat.
Its core advantages lie in its excellent sealing performance, easy opening and closing, and low cost. It is widely used in medium- and low-pressure applications with high sealing requirements, such as water supply and drainage, HVAC, chemical, food, and pharmaceutical industries.
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flanged soft-seal butterfly valve Technical parameters
| Nominal diameter |
DN(mm) |
50~2000 |
||
| Nominal pressure |
PN(MPa) |
0.6 |
1.0 |
1.6 |
|
Test pressure Ps(MPa) |
Strength test |
0.9 |
1.5 |
2.4 |
| Sealing test |
0.66 |
1.1 |
1.76 |
|
| Gas Tightness Test |
0.6 |
0.6 |
0.6 |
|
| Applicable media | Air, water, sewage, steam, gas, oil, etc. | |||
| Drive form | Manual, worm gear drive, pneumatic drive, electric drive. | |||
Parts material of flanged soft-seal butterfly valve
| Part Name | Material |
|---|---|
| Valve Body | Rubber (various types), PTFE |
| Disc | Gray Iron, Ductile Iron, Cast Steel, Stainless Steel, Special Materials |
| Seal Ring | Ductile Iron, Cast Steel, Alloy Steel, Stainless Steel |
| Valve Stem | 2Cr13, Stainless Steel |
| Packing | O-ring, Flexible Graphite |
flanged soft-seal butterfly valve Structural Features
- Flange Connection: The valve body has flanges at both ends, which are directly bolted to the pipe flanges, ensuring reliable sealing and convenient installation, especially suitable for high-pressure and large-diameter applications.
- Soft Seal Structure:
- Sealing Materials: Utilizes elastic materials such as nitrile rubber, ethylene propylene rubber, polytetrafluoroethylene (PTFE), and silicone rubber, providing excellent sealing performance and achieving bidirectional zero leakage.
- Sealing Forms: Includes centerline soft seal and composite seat centerline seal. The centerline soft seal butterfly valve features a spherical outer circle of the butterfly plate, which, when combined with the synthetic rubber valve seat, forms a bidirectional seal. The composite seat centerline butterfly valve uses a combination of soft and hard layered metal sheets (such as a composite of flexible graphite and stainless steel plates), combining the advantages of both hard metal seals and elastic seals.
- Sealing Characteristics: No sliding friction between the butterfly plate and the sealing ring reduces wear and improves sealing reliability. The three-dimensional eccentric structure achieves a "tighter as it closes" sealing function, adapting to high-pressure conditions.
- Disc Design: The disc is a circular or elliptical thin plate that controls the flow rate of the medium by rotating around its own axis (0°~90°). Some discs adopt a double-flat truss flow-through design, which has low flow resistance, high strength, and good vibration resistance.
- Drive Method: Supports multiple drive methods such as manual, electric, and pneumatic to meet the needs of different working conditions. Electric/pneumatic drives can achieve remote control and automatic adjustment, with fast response speed, and are suitable for flammable and explosive environments.
flanged soft-seal butterfly valve Applications
- Water Supply and Drainage Systems: Controls water flow in urban water supply and sewage treatment systems, adapting to conditions containing impurities.
- Food and Pharmaceutical Industries: Controls fluid flow in the production processes of beverages, dairy products, and pharmaceutical solutions, ensuring compliance with hygiene standards.
- Chemical and Petroleum Industries: Regulates the flow of corrosive media such as acids, alkalis, and oils, adapting to high-temperature and high-pressure conditions.
- Light Textile and Paper Industries: Controls the flow of media such as pulp and dyes, adapting to conditions containing fibers.
- Gas and Heating Systems: Regulates the flow of media such as natural gas and steam, ensuring safe system operation.
flanged soft-seal butterfly valve factory
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