Sealing device for valves
AssigneeMatkemi AG
InventorJean Friess
Life of this patent
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Abstract
The device comprises a main valve-seat of sheet metal having an anchoring flange attached to the valve body and a closure structure which is adapted to cooperate with the valve disk by means of an outer wall forming a curled shell, said closure structure being applied against the convex surface of an auxiliary seat which is in turn applied against the valve body in order to ensure resilient coiling-up of the curled shell when closing the valve, thereby reducing the operating torque of the valve and achieving enhanced leak-tightness in the closed position.
Claims17
A sealing device for valves in which provision is made for a main metallic valve seat consisting of a resilient annular closure structure having an outer wall of curled sheet metal, said outer wall having an outer face which is intended to be in contact with the valve element when said element is in the closed position, the device being further provided with means for ensuring leak-tightness between the main seat and the valve body, wherein, in order to decrease the torque and to reduce the friction forces generated by rotation of the valve element, said device further comprises at least one auxiliary seat bearing on said outer face of the outer wall and allowing the closure structure of the main seat to bear on the valve body when the valve element is in the closed position, said auxiliary seat being provided with a convex bearing surface for contact with the valve-closure structure and being arranged as a means for guiding the outer wall of the closure structure in a coiling motion thereof.
Dependencies are inferred from the claim text.