... or the thing block, at the same time reduce the maintenan main features ce cost, and allow the solid particle to pass ... , buna-N rubber, EPDM and so on, and flange material is Q235, 304, 316 and so on. Applications : This valve is widely used in the ... -way valve, its required specifications is few and the diameter is small, but the amount demand is large, is very suitable for mass production. Duckbill ...