초록 ▼

A flapper valve assembly (110) having a biasing flapper closure assembly (102) is disclosed. The flapper valve assembly (110) comprises tubular valve housing (94) having a hinge (100) and a longitudinal hole (104). A valve seat (92) is mounted within the housing (94) having a flow passage therethrou

A flapper valve assembly (110) having a biasing flapper closure assembly (102) is disclosed. The flapper valve assembly (110) comprises tubular valve housing (94) having a hinge (100) and a longitudinal hole (104). A valve seat (92) is mounted within the housing (94) having a flow passage therethrough. A flapper closure plate (86) is rotatably disposed within the housing (94) about the hinge (100). The flapper closure plate (86) is rotatable between a valve open position and a valve closed position. The flapper closure plate (86) has a notch (132) on the side opposite its sealing surface (114) that is spaced a distance (136) from the hinge (100). The flapper closure assembly (102) includes a spring (116) mounted within the longitudinal hole (104) and a connection member (122) operably coupled to the spring (116) and engaging the notch (132) 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.

대표청구항 ▼

[ What is claimed is:] [1.]1. A flapper valve assembly comprising:a tubular valve housing having a hinge and a hole;a valve seat mounted within the housing having a valve seat sealing surface, the valve seat defining a flow passage therethrough;a flapper closure plate rotatably coupled to the hinge

[ What is claimed is:] [1.]1. A flapper valve assembly comprising:a tubular valve housing having a hinge and a hole;a valve seat mounted within the housing having a valve seat sealing surface, the valve seat defining a flow passage therethrough;a flapper closure plate rotatably coupled to the hinge and rotatable between a valve open position in which the flapper closure plate is removed from the valve seat and a valve closed position in which a sealing surface of the flapper closure plate sealingly engages the valve seat sealing surface for preventing flow through the flow passage; anda flapper closure assembly biasing the flapper closure plate toward the closed position, the flapper closure assembly including a spring mounted within the hole and a connection member operably coupling the spring to the flapper closure plate, the spring being compressed when the flapper closure plate is moved toward the open position causing the connection member to urge the flapper closure plate toward the closed position, the connection member having a arcuate shape such that the connection member exerts a moment on the flapper closure plate when the flapper closure plate is in the open position.