China Vulcanized Seat Flanged Long Stem Butterfly Valve Factory, Factories
Product Description
1. Vulcanized Valve Seat
Made of special vulcanized material, it has good wear resistance and sealing performance, ensuring long-term stable operation of the valve.
2. Extended Stem Butterfly Valve
This design is used in underground or buried service applications. The extended stem allows the valve to be operated from the surface or by extending the actuator. This makes it ideal for underground pipelines.
3. Flange Connection
Standard flange connection is used to facilitate connection with other equipment and has a wide range of applications.
4. Various Actuators
Electric actuators, but other actuator also can be selected according to user needs to meet different operating needs, such as worm gear, pneumatic, etc.
5. Scope of Application
Widely used in pipeline flow control in petroleum, chemical industry, metallurgy, water treatment and other fields.
6. Sealing Performance
When the valve is closed, it can ensure complete sealing and prevent fluid leakage.
| Size & Pressure Rating & Standard | |
|---|---|
| Size | DN40-DN1800 |
| Pressure Rating | Class125B, Class150B, Class250B |
| Face to Face STD | AWWA C504 |
| Connection STD | ANSI/AWWA A21.11/C111 Flanged ANSI Class 125 |
| Upper Flange STD | ISO 5211 |
| Material | |
| Body | Ductile Iron, WCB |
| Disc | Ductile Iron, WCB |
| Stem/Shaft | SS416, SS431 |
| Seat | NBR, EPDM |
| Bushing | PTFE, Bronze |
| O Ring | NBR, EPDM, FKM |
| Actuator | Hand Lever, Gear Box, Electric Actuator, Pneumatic Actuator |
The extended stem allows the valve to be installed underground or in buried service while still enabling seamless surface operation and actuator adjustment without requiring direct pit entry.
A vulcanized seat is firmly bonded to the valve body, providing outstanding wear resistance, preventing movement or peeling under high pressure, and ensuring long-term stable shut-off performance.
Our valves are configured to match various operational needs, supporting manual hand levers, worm gearboxes, electric actuators, and pneumatic actuators using the standard ISO 5211 upper flange connection.
These double flange butterfly valves range in size from DN40 up to DN1800, with working pressure ratings covering Class 125B, Class 150B, and Class 250B according to AWWA standards.
They are widely applied in flow regulation and shut-off pipelines across water treatment plants, municipal engineering, petroleum processing, chemical industries, and metallurgical applications.
The valve configuration utilizes NBR, EPDM, and FKM materials for seats and O-rings, ensuring full tightness and zero leakage suitable for diverse fluid media.
