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.

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.

Abstract: A swing check valve having a generally cylindrical body with a fluid passageway extending therethrough, an annular resilient seat molded in place within the 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 an arm removably connected to a shaft extending through the body and a generally circular valve loosely mounted to the arm and adapted to engage the seal. The shaft is disposed for rotation within a bore extending completely through the body and a lever is removably attached to the external end of the shaft to permit manual operation of the valve. In order to prevent the valve from slamming shut in the event of a sudden flow reversal, it is spring biased toward a closed position with a spring attached to the lever.