US 4,304,255 AGranted

Swing check valve

AssigneeK-F Prince Valve, Inc.

InventorDarryll G. Prince

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Abstract

A swing check valve having a generally cylindrical body with a fluid passageway extending therethrough, an annular resilient seat molded in place within said passageway and oriented normal to the passageway axis, and a clapper assembly pivotally mounted for rotation about an axis normal to the passageway axis. The clapper assembly includes a spring biased pivoting arm and a generally circular valve loosely mounted to the arm and adapted to engage the seal. The arm and valve are connected by a threaded fastener fixedly mounted to the valve and extending through an oversized aperture near the free end of the arm, and an adjustment nut. During assembly the free movement of the valve with respect to the arm is adjusted by rotating the valve and fastener with respect to the nut until the desired amount of movement is obtained and then welding this nut to the fastener. Any tendency of the valve to spin during operation is eliminated by the walls of a recess formed in the arm which prevent the adjustment nut, fastener and valve assembly from turning.

Claims11

Dependent claims

A swing check valve comprising:

a generally cylindrical body having an upstream face and an opposing downstream face arranged for disposition between a pair of opposed flanges in a fluid conduit and defining therebetween the axial length of said body, and a fluid passageway extending axially through said body;
an annular, resilient seat disposed within said fluid passageway, said seat including a first annular seating surface;
an arm pivotally mounted within said body for rotation within said fluid passageway about an axis substantially normal to a central longitudinal axis of said fluid passageway, said arm including a recess defined by a pair of opposing walls on said arm;
a generally circular valve loosely connected to said arm, said valve having an upstream face including a second annular seating surface adapted to sealably engage said first annular seating surface when said valve is in a closed position;
biasing means connected to said arm for urging said valve into said closed position;
and
a threaded fastener for connecting said valve and said arm, said fastener being fixedly attached to said valve, said valve being secured to said arm with an adjustment nut secured to said fastener and at least partially disposed within said recess and engageable with said walls on said arm to restrict the rotation of said nut and said valve about the axis of said fastener while permitting said valve two degrees of limited rotational freedom with respect to said arm.

4 more elements

A swing check valve comprising:

a generally cylindrical body having an upstream face and an opposing downstream face arranged for disposition between a pair of opposed flanges in a fluid conduit and defining therebetween the axial length of said body, and a fluid passageway extending axially through said body;
an annular, resilient seat disposed within said fluid passageway, said seat including a first annular seating surface;
an arm pivotally mounted within said body for rotation within said fluid passageway about an axis substantially normal to a central longitudinal axis of said fluid passageway;
a generally circular valve loosely connected to said arm, said valve having an upstream face including a second annular seating surface adapted to sealably engage said first annular seating surface when said valve is in a closed position;
biasing means connected to said arm for urging said valve into said closed position;
and
a threaded fastener for connecting said valve and said arm, said fastener being fixedly attached to said valve and including means cooperable with said arm to provide for two degrees of limited rotational freedom of said valve with respect to said arm while cooperating with said arm to restrict the rotation of said valve about the axis of said fastener.

4 more elements

Dependencies are inferred from the claim text.