For soft sealing butterfly valve, there are soft back seat butterfly valve and hard back seat butterfly valve. The sealing seat in soft sealing butterfly valve can be EPDM, NBR, or PTFE. The hardback seated butterfly valve and softback seated butterfly valve both refer to the soft sealing butterfly valve. Both types kind of sealing seat(no matter hardback seat or softback seat) can achieve zero leakage, they almost have the same long service life, even in terms of price, the hardback seated butterfly valve is cheaper than the softback seated butterfly valve.
Components for no pin soft back seated concentric wafer lever butterfly valve:
|1||Valve seat||Ductile cast iron|
|2||Valve stem without pins||SS416|
|3||Valve disc without pins||CF8|
|5||Lever hand||Aluminum alloy|
Advantages of resilient seated concentric wafer type manual lever butterfly valve:
1. the thickness of the valve body of the softback seated butterfly valve is a little thicker than that of the hardback seat butterfly valve;
2. The groove inside the valve body of the soft back seat butterfly plays a important role in guaranteeing the sealing performance of the soft back seat butterfly valve;
3. The valve seat and valve body of the soft back seat butterfly valve are separated, which is easy for maintenance and replacement;
4. The valve seat of the soft back seat butterfly valve is made of pure rubber, which ensures its rubber content, and enhances the resilience of the rubber valve seat. The soft back seat butterfly valve has a long service life and is easy and convenient to replace the sealing seat;
5. The soft back seat butterfly valve has small torque, is light to open and close, has good sealing performance, and can maintain and stabilize the pressure for a long time;
6. The soft back seat butterfly valve no pin has better sealing performance, there is no pin hole to leak.
7. The aluminum alloy lever handle is used in soft back seat butterfly valve, which has good corrosion resistance; the pinless valve stem is easy to replace the valve stem and the valve plate(disc), the material is SS 316, which has strong strength and toughness, and the valve stem will not be broken;
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