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The slab gate valve can be classified into single gate plate flat gate valve and double gate plate slab gate valve based on the structure of the gate plate. The single gate plate valve has two types: floating valve seat and fixed valve seat, which achieves single-sided sealing by relying on the medium pressure. The double gate plate valve is equipped with a spring or wedge-type opening mechanism between the two gate plates, enabling double-sided forced sealing or switching to single-sided sealing under high pressure.