Flapper valve with biasing flapper closure assembly

摘要

A flapper valve assembly (110) comprises: a tubular valve housing (94) having a hinge (100) and a hole (104); a valve seat (92) mounted within the housing having a valve seat sealing surface, the valve seat (92) defining a flow passage therethrough; a flapper closure plate (86) rotatably coupled to the hinge (100) and rotatable between a valve open position in which the flapper closure plate (86) is removed from the valve seat (92) and a valve closed position in which a sealing surface of the flapper closure plate (86) sealingly engages the valve seat sealing surface for preventing flow through the flow passage; and a flapper closure assembly (102) biasing the flapper closure plate (86) toward the closed position. The flapper closure assembly (102) includes a spring (116) mounted within the hole (104) and a connection member (122) operably coupling the spring (116) to the flapper closure plate (86) such that when the flapper closure plate (86) is moved toward the open position, the spring (116) is compressed causing the connection member (122) to urge the flapper closure plate (86) toward the closed position.