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OEM Flange Connection Double Eccentric Butterfly Valve Manufacturers, Exporters
Product Description
Structure of Double Eccentric Butterfly Valve
Double eccentric butterfly valve also named double offset butterfly valve, it has two offsets:
- 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.
Advantages of Double Eccentric Butterfly Valve
Durability
Double eccentric design minimizes disc-seat contact, extending valve life.
Low Torque
Reduces actuation effort, enabling smaller, cost-effective actuators.
Versatility
Suitable for high-pressure, high-temperature, or corrosive media with proper material selection.
Easy Maintenance
Replaceable seats and seals in many designs.
The suitable application for double offset butterfly valve is: working pressure under 4MPa, working temperature under 180℃ as it has a rubber sealing surface.
Industry Applications
| Industry | Specific Applications |
|---|---|
| Chemical | Handling caustic, corrosive, dry chlorine, oxygen, toxic substances, and aggressive media |
| Oil and Gas | Managing sour gas, oil, and high-pressure systems |
| Water Treatment | Processing wastewater, ultra pure water, seawater, and vacuum systems |
| Power Generation | Controlling steam and high-temperature flows |
| HVAC Systems | Regulating flow in heating, ventilation, and air conditioning systems |
| Food and Beverage | Managing flow in processing lines, ensuring hygiene and safety |
| Mining | Handling abrasive and corrosive media in extraction and processing |
| Petrochemical | Supporting high-pressure and high-temperature petrochemical processes |
| Pharmaceutical | Ensuring precise control in sterile and high-purity environments |
| Pulp and Paper | Managing flow in paper production, including corrosive and high-temperature media |
| Refining | Controlling flow in refining processes, including high-pressure and corrosive conditions |
| Sugar Processing | Handling syrups and other viscous media in sugar production |
| Water Filtration | Supporting filtration systems for clean water supply |
Technical Specifications & Material
| 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 Specifications | |
| 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 | Gear Box, Electric Actuator, Pneumatic Actuator |
Frequently Asked Questions (FAQ)
1. What are the two offsets in a double eccentric butterfly valve?
The first offset is the axis of the shaft deviating from the center of the disc, and the second offset is the axis of the shaft deviating from the pipeline center.
2. What are the primary operating limits for this type of valve?
The typical working application requires a working pressure under 4MPa and a working temperature under 180℃ due to the rubber sealing surface.
3. Why does the double eccentric design reduce operating torque?
The double offset structure minimizes friction and disc-seat contact during opening and closing, which significantly lowers actuation effort and allows the use of smaller actuators.
4. Which actuator options can be installed on these valves?
Double eccentric butterfly valves can be fitted with manual gearboxes, electric actuators, or pneumatic actuators based on system automation requirements.
5. What size ranges and standard pressure ratings are available?
The valves are available in sizes ranging from DN40 to DN2200, with pressure ratings including PN10, PN16, CL150, JIS 5K, and JIS 10K.
