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                閥門中的可拆裝表面工件用于撐持閥芯的緊閉狀態,并形成密封副。通常閥座直徑是閥門的較大流量直徑。如蝶閥的材質種類各式各樣,各種橡膠、金屬材質都可以作為閥座材質。閘閥內部可拆卸的工件用于維持閥芯的全閉狀態,形成密封副。一般直徑是閘閥較大的商品流通直徑。

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