Wholesale Double Eccentric Butterfly Valves Surfacing SS304 Sealing Manufacturers, Factories
Product Description
Product Specifications
Characteristics
The eccentric butterfly valve adopting a double eccentric structure design, it has the functions of intercepting, connecting, and regulating flow, which can meet the diverse needs of urban water supply and drainage, building fire protection, metallurgical hydropower and other system pipelines. Its sealing surface is welded with stainless steel material, combined with a dual sealing ring structure, which effectively solves the problem of shaft hole leakage while improving corrosion resistance. The product achieves or exceeds the national standard level in performance indicators through the application of flow field simulation and stress measurement technology.
Key Advantages
Reduced Wear & Extended Life: The axis of the valve stem deviates from the center of the sealing surface and the center of the pipeline, causing the butterfly plate to quickly detach or come into contact with the valve seat during the opening and closing process, greatly reducing friction. Significantly reduce the wear of the sealing surface, extend the service life of the valve seat and butterfly plate, especially suitable for frequent operation occasions.
Zero Leakage Performance: The eccentric structure utilizes the principle of mechanical torque to generate stronger sealing pressure during closure, ensuring a tight seal. It can achieve bidirectional sealing (partially designed), with a leakage level of up to ANSI Class VI (zero leakage), suitable for demanding working conditions.
High Temp & Pressure Resistance: The eccentric structure allows the use of metal sealing rings (such as stainless steel, hard alloy) instead of traditional rubber soft seals, which can withstand higher temperatures and pressures (commonly up to 200 ° C or higher, PN16-PN40 or higher). Can be used for complex media such as steam, gas, corrosive fluids, granular slurries, etc.
Material Configurations
| Body | Plate | Rotating Shaft | Bushing | Seat | Operating Temp (°C) |
|---|---|---|---|---|---|
| Ductile Iron + SS304 | Electroplated Nodular Cast Iron | Stainless Steel | PTFE | EPDM Rubber | -45～+135 (Short-time -50～+150) |
| Ductile Iron + SS304 | Ductile Iron | Stainless Steel | PTFE | Hypalon | -18～+135 (Short-time -18～+149) |
| Carbon Steel + SS304 | Stainless Steel | Carbon Steel | PTFE | Abrasion-Resistant Rubber | -10～+50 |
| - | CF8M Stainless Steel | - | - | Fluororubber | -23～+150 |
| - | - | - | - | Heat-Resistant EPDM Rubber | -20～+150 |
| - | - | - | - | PTFE | +10～+150 |
Dimensions
Packaging Details
Standard export wooden case packaging is used to guarantee maximum safety during maritime and international transit.
Application Scenarios
The double eccentric butterfly valves are suitable for room temperature clean water, cooling water, circulating water systems, as well as municipal water supply, building pipelines, fire protection pipelines, etc. They are generally suitable for applications with pressure levels of PN1.0-PN1.6MPa.
Frequently Asked Questions (FAQ)
What design standards does this eccentric butterfly valve meet?
Our eccentric butterfly valves comply with the EN593 international standard and are manufactured using precision investment casting to ensure high structural integrity and reliability.
How does the double eccentric structure extend the valve's service life?
The axis of the valve stem is offset from the sealing surface and pipe center. This allows the butterfly plate to quickly disengage from the seat during opening, dramatically reducing friction, minimizing seat wear, and extending operational life under frequent cycles.
What is the sealing grade and direction of this valve?
It provides bidirectional sealing capability with zero leakage performance (up to ANSI Class VI tightness), preventing fluid leakage in either direction across the pipeline.
What operating temperatures and media can this valve handle?
Standard operating temperatures range from -20°C to 120°C (with options extending up to 150°C-200°C+ depending on seat configuration). Suitable media include clean water, cooling water, circulating water, steam, gases, and corrosive or slurried fluids.
What pressure ratings are supported for application scenarios?
The double eccentric butterfly valves are generally designed for working pressure levels between PN1.0 and PN1.6MPa, with metal-sealed options available for higher pressure classes up to PN40.
How are the valves packed for export transport?
All valves are packed in standard export wooden cases to prevent mechanical damage, corrosion, or shifting during ocean or air transport.
