1. The sealing surface of valve seat and hemispheroidal is made of engineering ceramics, which has the property of high rigidity, washing out-resistance and long life time. It is very suitable for start and stop function in the medium mixed with solid and liquid including powdery granular. 2.Hemispheroid adopts fixed style and owns good rigidity. The shape is V type, with small volume and less weight. 3. The seal surface' distance between valve and hemispheroid is adjustable. The distance could adjusted to extended the lifetime after a period of time. 4. The passageway is unblocked and the medium has small flow resistance when the valve is fully open.
 

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