US 12,135,090 B2
Check valve
Jeffrey Michael Partridge, Spring, TX (US)
Filed by FMC Technologies, Inc., Houston, TX (US)
Filed on Sep. 27, 2019, as Appl. No. 16/586,752.
Prior Publication US 2021/0095772 A1, Apr. 1, 2021
Int. Cl. F16K 15/03 (2006.01); F16K 27/02 (2006.01)
CPC F16K 15/03 (2013.01) [F16K 27/0227 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A check valve comprising:
a valve body which includes an inlet end, an outlet end and a flow bore that extends between the inlet and outlet ends;
a valve seat which is positioned across the flow bore; and
a flapper which is configured to seal against the valve seat, the flapper being connected to or formed integrally with a pivot pin and being pivotable between a closed position in which the flapper is positioned against the valve seat and an open position in which the flapper is displaced from the valve seat;
wherein the pivot pin comprises opposite first and second ends, each of which is supported in a corresponding resilient bushing which is fixed in position relative to the valve body;
wherein the resilient bushings are configured to generate a spring force on the pivot pin; and
wherein each bushing is configured to bias the pivot pin toward the inlet end of the valve body.