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China Double Eccentric Flanged Butterfly Valve Suppliers - Quality Factory Direct Rubber Sealing Valves
Features
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Bubble-tight shut-off at full pressure rating
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Double eccentric design optimizes the seal of the seat retaining ring allowing the disc to seal tightly while retaining the seat in position against high pressure and flow
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Standardized actuator flange for easy operator interchangeability
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Top bushing absorbs side thrust loads
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Hub seal provided by preloaded contact between flatted seat surface and disc hub area for positive sealing at all disc positions
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Specially engineered seat sealing system adds to longer service life and lower operating torque
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Molded-in O-rings provides flange sealing and eliminates need for gaskets
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Universal Mounting Flange — The cast-in actuator flange is universally designed in accordance with ISO 5211 standard dimensions. The mounting flange can accommodate all types of operators such as: gear operators, electric actuators, and pneumatic actuators.
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Compared with the midline butterfly valve, the double eccentric butterfly valve is more resistant to high pressure, longer life, and good stability
Materials Of Main Parts
| ITEM | PART NAME | MATERIAL |
| 1 | Body Material | Ductile iron / CF8 / CF8M / CF3M / WCB |
| 2 | Seat Material | EPDM / NBR / Buna / Viton, Etc. |
| 3 | Stem Material | SS420 / SS410 / SS416 / SS316 / SS304 / Duplex Stainless Steel, Etc. |
| 4 | Disc Material | Ductile Iron Epoxy / CF8 / CF8M / CF3M / Duplex SS / Al-Bronze, Etc. |
| 5 | Gear Box | Ductile Iron / Aluminum |
| 6 | Bushing | PTFE / Bronze |
| 7 | O Ring | NBR / EPDM / VITON |
Valve Standard
| Category | Details |
| Type | Double Eccentric Flanged |
| Face to Face | BS5155, EN558-1 Series 13 / Series 14, ISO5752 Series 13 / Series 14 |
| Flange Drilling | EN1092 PN10 / PN16 / JIS10K / ANSI150 / SANS |
| Mounting Flange | ISO5211 |
| Pressure Rating | PN10 / PN16 / PN25 / 150PSI / 200PSI / Class 150 |
| Application | HVAC, Water Supply & Sewage, Food & Beverage, Chemical / Petrochemical Processing, Power and Utilities, Paper and Pulp, Marine |
Dimensions (mm)
More Details
Frequently Asked Questions
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What is a double eccentric butterfly valve and how does it differ from a standard butterfly valve?
A double eccentric (double offset) butterfly valve features two offset points — the stem is offset from both the centerline of the disc and the centerline of the bore. This design allows the disc to lift away from the seat immediately upon opening, significantly reducing wear and operating torque compared to a standard concentric butterfly valve. It also offers superior sealing performance under high pressure and extended service life.
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What pressure ratings are available for this double eccentric butterfly valve?
This valve is available in multiple pressure ratings to suit various applications: PN10, PN16, PN25, 150PSI, 200PSI, and Class 150. Please contact us to confirm the appropriate pressure rating for your specific system requirements.
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What body and disc materials are available?
The valve body is available in Ductile Iron, CF8, CF8M, CF3M, and WCB. Disc materials include Ductile Iron Epoxy, CF8, CF8M, CF3M, Duplex Stainless Steel, and Aluminum Bronze. A wide range of seat materials is also offered, including EPDM, NBR, Buna, and Viton, allowing the valve to be configured for diverse media and temperature conditions.
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What types of actuators are compatible with this valve?
The valve features a universal mounting flange designed in accordance with ISO 5211 standard dimensions. This allows it to accommodate all common operator types, including manual gear operators, electric actuators, and pneumatic actuators, making it highly versatile for automated or manual control systems.
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What industries and applications is this valve suitable for?
This double eccentric butterfly valve is suitable for a wide range of industries, including HVAC systems, water supply and sewage treatment, food and beverage processing, chemical and petrochemical processing, power generation and utilities, paper and pulp manufacturing, and marine applications.
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What international standards does this valve comply with?
The valve is manufactured in compliance with recognized international standards. Face-to-face dimensions conform to BS5155, EN558-1 Series 13 & 14, and ISO5752 Series 13 & 14. Flange drilling complies with EN1092 PN10/PN16, JIS10K, ANSI150, and SANS standards. The actuator mounting flange follows ISO 5211 dimensions.