Check valve
AssigneeFMC Corporation
InventorsCharles C. Partridge, Howard G. Boswell, Lawrence E. Branch
Life of this patent
Estimating the term…
Abstract
A fluid flow check valve with two disc closure elements pivotally mounted in the valve's body. A concave surface on the upstream side of each disc assists in stabilizing the discs against flutter during flow through the valve, and angular lugs on the downstream side of the discs cooperate with a stop shaft to further stabilize the assembly when the discs are fully open. The valve also includes a resilient seat with an annular sealing bead to facilitate a high unit load on the seat at low pressures, and with a large seal area to support the discs at high back pressures.
Claims8
In a check valve assembly comprising a valve body with a fluid flow passage therethrough, at least one valve disc pivotally mounted on a hinge shaft within the flow passage for movement between open and closed positions, said valve disc having a sealing surface, and stop means for preventing pivotal movement of the disc beyond a predetermined position, the improvement comprising a concave surface on the upstream side of the valve disc for cooperation with fluid flowing through the valve to establish a force tending to urge said disc towards its fully opened position, and at least one wedging means on the surface of the downstream side of the valve disc, said wedging means having a functional surface disposed at an acute angle with respect to a line perpendicular to the valve disc sealing surface, said functional surface cooperating with said stop means to bias said valve disc in a downstream direction.
In a check valve assembly comprising a valve body with a fluid flow passage therethrough, at least one valve disc pivotally mounted on a hinge shaft within the flow passage for movement between open and closed positions, said valve disc having a sealing surface, and a stop shaft loosely and securely mounted in the valve body for preventing pivotal movement of the disc beyond a predetermined position, the improvement comprising at least one wedging means on the surface of the downstream side of the valve disc, said wedging means having a functional surface disposed at an acute angle with respect to a line perpendicular to the valve disc sealing surface, said wedging means cooperating with the stop shaft to hold said valve disc in an unfluttering, stable condition during fluid flow through said valve assembly, said wedging means also causing said stop shaft to move in a generally upstream direction into a position wherein the valve disc and the stop shaft are held together in a stable condition.
Dependencies are inferred from the claim text.