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The valve is consisting of check valve, butterfly valve and cylinder. The nimble hammer-type check valve makes it possible that have no oil when closing down instantly. The close of butterfly valve is controlled by cylinder which is load open and unload closed, users can designate the unload hole on butterfly valve or standardized collocate. When the unload pressure or activate pressure need up regulation, it can adjust the gap size of butterfly valve that match the area of the unload hole. The valve is consist of three intake valve series that include normally closed type , normally open type and invert type, each series can match flange and have many chooses of install hole and filter interface, it is widely assorted with hand piece.