China CF8 Wafer High Performance Butterfly Valve with Support Manufacturers, Factories
Product Description
Double-Offset (Eccentric) Design
The shaft is offset from the disc centerline and pipe centerline, reducing seat wear and friction during operation. This ensures a tight seal, minimizes leakage, and enhances longevity.
Resilient & Replaceable Sealing
Equipped with resilient seats, typically RPTFE (reinforced Teflon) for enhanced temperature resistance (up to ~200°C) or EPDM/NBR for general applications. Some models offer replaceable seats for easy maintenance.
Bi-Directional Sealing
Provides reliable sealing under full pressure in both flow directions, ideal for preventing backflow.
High Flow Capacity
The streamlined disc design ensures large flow capacity with low pressure drop, optimizing fluid control.
Actuator Support
Worm gear, pneumatic or electric actuators are commonly supported, ensuring precise control. Electric models maintain position on power loss, while spring-return pneumatic models fail closed.
| Size & Pressure Rating & Standard | |
|---|---|
| Size | DN40 - DN1800 |
| Pressure Rating | Class 125B, Class 150B, Class 250B |
| Face to Face STD | AWWA C504 |
| Connection STD | ANSI/AWWA A21.11/C111 Flanged ANSI Class 125 |
| Upper Flange STD | ISO 5211 |
| Material Specifications | |
| Body | Carbon Steel, Stainless Steel |
| Disc | Carbon Steel, Stainless Steel |
| Stem / Shaft | SS416, SS431, SS |
| Seat | Stainless Steel with welding |
| Bushing | PTFE, Bronze |
| O-Ring | NBR, EPDM |
| Actuator Options | Hand Lever, Gear Box, Electric Actuator, Pneumatic Actuator |
The double-offset (eccentric) design offsets the shaft from both the disc centerline and the pipe centerline. This configuration dramatically minimizes contact friction between the disc and the seat during operation, resulting in reduced seat wear, reliable bi-directional shutoff, lower operating torque, and extended valve service life.
The valves feature resilient seats such as RPTFE (reinforced Teflon) capable of handling elevated working temperatures up to roughly 200°C, as well as EPDM and NBR options for general fluid services. Replaceable seat options are also offered for simplified site maintenance.
Yes, these valves are engineered for bi-directional sealing under full differential pressure in both directions. This capability prevents backflow and makes the valve versatile across various piping arrangements.
The valves can be equipped with manual hand levers, worm gearboxes, pneumatic actuators, or electric actuators. The standard top mounting adheres to ISO 5211 for direct and reliable actuator integration. Electric actuators can retain their position upon power failure, and spring-return pneumatic actuators can provide fail-closed functionality.
The product line spans nominal diameters from DN40 up to DN1800, meeting AWWA C504 face-to-face dimensions and ANSI Class 125/150/250 pressure specifications with ANSI/AWWA flanged end configurations.
