TOBO STEEL GROUP CHINA
TOBO STEEL GROUP CHINA
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WCB Wafer Style Resilient Seated Butterfly Valves DN200 PN16
Design Features:
Upper and Lower Bearings to maximize valve life
Direct Mount
2”-12” standard with lever
14”and larger standard with gear
Support shaft seal: bonding of elastomer to phenolic backing ring protects against distortion, a common cause of shaft leakage
Integral ISO mounting pad for easy valve operation; no bracket needed
One piece stem ensures dependability and positive disc positioning
Available in Wafer and Lug styles
Disc has a precision profile that provides bubble tight shut off and assures minimum torque
Seat Materials: Multiple seat materials available
Seat Face negates need for flange gaskets
O-Ring ensures dependability and positive disc positioning
2”- 12” 200 psi
14”- 24” 150 psi
A Butterfly valve is a quarter-turn rotary motion valve, that is used to stop, regulate, and start the flow. Butterfly valves are a quick open type. A 90° rotation of the handle can completely close or open the valve. Normally, they are used in systems where a positive shut-off is not required. In this article, you will learn about following types of Valve.
Large Butterfly valves are usually equipped with gearbox type actuator, where the handwheel is connected to the stem via a gearbox. This will reduce the force but at the same time reduce the speed of the operation. This type of valve should be installed in the open position. If the valve is closed during installation, the rubber seat will wedge against the valve disc and make it difficult to open.
| Part | Materials |
|---|---|
| Body | Ductile Iron |
| Seat | EPDM / BUNA / VITON / PTFE |
| Disc | Ductile Iron / 316 Stainless Steal / Bronze |
| Seat | BUNA / EPDM / PTFE |
| Bushing | PTFE |
| O-Ring | EPDM / BUNA |
| Taper Pin | 316 Stainless Steel |
| Stem | 416 Stainless Steel |
Materials
Dimensions
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Types of Butterfly Valves Based on Body Construction
Based on the type of ends of the body butterfly valves are available in following types.
Both Flanged Ends
Wafer Type Ends
Lug Type Ends
Butt Welded Types Ends
Water Type
The wafer body is placed between pipe flanges, and the flange bolts surround the valve body. A wafer type butterfly valve is easy to installed but it cannot be used as an isolation valve.
Seat Types
Butterfly valves can be metal-to-metal seated, soft seated, or with a fully lined body and disc. The first image is of a soft seated fully lined body and disc valve. Second, is a soft seat with metal disk and the third is metal to metal seat type valve.
