초록 ▼

A valve adapted to be connected in a fluid line for shutting off flow in response to fluid pressure in excess of a predetermined pressure. The valve includes a housing provided with inlet and outlet ports separated by a valve seat. A pressure chamber in the housing is defined by a diaphragm subjecte

A valve adapted to be connected in a fluid line for shutting off flow in response to fluid pressure in excess of a predetermined pressure. The valve includes a housing provided with inlet and outlet ports separated by a valve seat. A pressure chamber in the housing is defined by a diaphragm subjected to the pressure of fluid flowing through the housing. The diaphragm is a unitary, homogenous, fluid impervious snap disc movable between two over center stable positions. A valve member cooperating with the valve seat is connected to the diaphragm by a stem, and the valve is open in one diaphragm position and closed in the other diaphragm position. A spring biases the valve member toward the closed position and is adjusted to preload the diaphragm so that when fluid pressure exceeds a predetermined value the diaphragm moves from the valve open to the valve closed position. A reset member is carried by the diaphragm and permits manual reopening of the valve.

대표청구항 ▼

An excess pressure shutoff valve comprising: a housing including inlet and outlet ports: a chamber in said housing in pressure communication with at least one of said inlet and outlet ports; a valve seat in said housing between said inlet and outlet ports; said chamber being defined in part by a dia

An excess pressure shutoff valve comprising: a housing including inlet and outlet ports: a chamber in said housing in pressure communication with at least one of said inlet and outlet ports; a valve seat in said housing between said inlet and outlet ports; said chamber being defined in part by a diaphragm; a valve member movable relative to said valve seat between valve open and valve closed positions; a stem interconnecting said diaphragm and said valve member for simultaneous movement; said diaphragm consisting of a unitary, one-piece, fluid impervious bistable snap disc having two over-center stable positions corresponding respectively to said valve open and valve closed positions; and a spring urging said valve member toward the valve closed position.