A valve housing, a valve disc disposed in said valve housing so that it is selectively brought into contact with a valve seat provided on said valve housing, a valve rod sealingly projected from the inside of said valve housing to the outside of said valve housing through a bellows,GATE VALVES said valve rod being capable of moving up and down and inclining, and a driving means provided at the outside of said valve housing for moving through said valve rod said valve disc between a position where said valve disc is faced with a gap to said valve seat and a position where said valve disc is not faced to said valve seat, and for inclining said valve rod so that said valve disc is brought into contact under pressure with said valve seat when said valve disc is moved to the position where it is faced to said valve seat,Gate Valves wherein said driving means comprises a piston cylinder means having a piston cylinder, and a piston rod, a yoke connected to said piston rod, a block connected to an upper portion of said valve rod, a step portion formed on an upper surface of said block, a step portion formed on a lower surface of said yoke so as to face to said step of said block, a planar plate cam of a diamond shape in cross section, arranged obliquely between said two steps, a spring for connecting said yoke to said block for suppressing the relative movement in the axial direction of said yoke and block, and a guide formed on a side surface of said piston cylinder for guiding said block so as to move up and down and to incline, and wherein said planar plate cam becomes flat when said yoke is urged toward said valve rod, so that said valve rod is inclined centering around said block and said disc is brought into contact under pressure with said valve seat.

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