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The detachable surface part of the valve is used to support the fully closed position of the valve core and constitute a sealing pair. The general seat diameter is the maximum diameter of the valve. The seat is made of a wide range of materials. All kinds of rubber, plastic and metal materials can be used as Valve Seat materials, such as: EPDM, NBR, NR, PTFE, PEEK, PFA, SS315, STELLITE and so on.