초록 ▼

A switching valve for delivering fluids from different inlets to a pumping outlet utilizes a pressure responsive spool movable due to a pressure differential in the inlets to one position wherein one of the inlets feeds the outlet and a second position wherein the other of the inlets feeds the outle

A switching valve for delivering fluids from different inlets to a pumping outlet utilizes a pressure responsive spool movable due to a pressure differential in the inlets to one position wherein one of the inlets feeds the outlet and a second position wherein the other of the inlets feeds the outlet. The spool carries a pair of umbrella valves for effectively controlling the flow of fluid to the outlets as well as a pair of biasing springs acting on each side of a piston diaphragm which has limited travel on the spool. An adjustable detent arrangement is provided on the end of the spool to keep the spool travel balanced and cooperates with the springs to furnish a snap acting valve.

대표청구항 ▼

A switching valve comprising: a. a housing having spaced apart fluid inlets, an outlet and an internal compartment; b. a valve member longitudinally movable in said compartment due to a pressure differential in one of said fluid inlets to a first position in which one of said inlets communicates wit

A switching valve comprising: a. a housing having spaced apart fluid inlets, an outlet and an internal compartment; b. a valve member longitudinally movable in said compartment due to a pressure differential in one of said fluid inlets to a first position in which one of said inlets communicates with said outlet and a second position in which the other of said inlets communicates with said outlet; c. pressure responsive sealing means secured in said housing and dividing said compartment into a pair of chambers, each chamber having one of said fluid inlets, said pressure responsive sealing means being slidably disposed for limited travel on said valve member; d. a valving means mounted on said valve member in each of chambers for controlling the flow of fluid from each of said inlets to said outlet; e. biasing means mounted on said valve member and acting on each side of said pressure responsive sealing means for assisting the movement of said valve member and said valving means; and f. adjustable detent means located at one end of said valve member for retaining said valve member at first and second positions, said biasing means and said detent means cooperating together to ensure a snap action switch between said first and second positions.