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The rack mainly by the fan-shaped gate valve, on the thread coupling, seals the flange plate, the both sides base plate, changes the diameter clamp, the by-pass ball valve and diffuses the installment and so on several parts to be composed balanced. The rack is the opening machine, the trap, under stops up uses in common the part. In the construction work, opens through rack’s on fan-shaped gate valve shuts the function, carries on the opening trap equipment’s replacement.