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OEM Short Pattern U Shape Double Eccentric Butterfly Valve Factories, Exporters
Product Description
Double Offset Butterfly Valve Characteristics
- 1st Offset: The axis of the shaft deviates from the center of the disc.
- 2nd Offset: The axis of the shaft deviates from the pipeline center.
Suitable Applications: Working pressure under 4MPa, working temperature under 180℃ as it is equipped with a rubber sealing surface.
| Technical Specifications | |
|---|---|
| Size & Pressure Rating & Standard | |
| Size | DN40-DN2200 |
| Pressure Rating | PN10, PN16, CL150, JIS 5K, JIS 10K |
| Face to Face STD | API609, BS5155, DIN3202, ISO5752 |
| Connection STD | PN6, PN10, PN16, PN25, 150LB, JIS5K, 10K, 16K, GOST33259 |
| Upper Flange STD | ISO 5211 |
| Material | |
| Body | Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB A216), Stainless Steel (SS304 / SS316 / SS304L / SS316L) |
| Disc | DI+Ni, Carbon Steel (WCB A216), Stainless Steel (SS304 / SS316 / SS304L / SS316L) |
| Stem / Shaft | SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel |
| Seat | NBR, EPDM / REPDM, Viton, Silicon |
| Bushing | PTFE, Bronze |
| O Ring | NBR, EPDM, FKM |
| Actuator | Hand Lever, Gear Box, Electric Actuator, Pneumatic Actuator |
Frequently Asked Questions (FAQ)
What are the "two offsets" in a double offset butterfly valve?
The two offsets refer to the axis geometry of the valve: the first offset is the axis of the shaft deviating from the center of the sealing disc, and the second offset is the axis of the shaft deviating from the pipeline center. This design allows the disc to lift off the seat quickly, reducing friction and extending seat life.
What are the operating temperature and pressure limits?
Due to its resilient rubber sealing construction, this valve configuration is suitable for systems operating under a maximum working pressure of 4MPa and a working temperature up to 180℃.
Which standard dimensions and pressure ratings are available?
Valves are available in nominal sizes from DN40 to DN2200, with pressure classes conforming to PN10, PN16, Class 150, JIS 5K, and JIS 10K.
Can these valves be automated?
Yes. Equipped with an ISO 5211 standard upper mounting flange, the valves easily accommodate various automation setups, including electric actuators and pneumatic actuators, as well as manual hand levers and gearboxes.
What seat and body material options are supported?
Body material options include Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB), and Stainless Steel (SS304/SS316). Resilient seats are offered in NBR, EPDM/REPDM, Viton, and Silicon depending on media compatibility.
