Switching valve

Details Switching valve Switching valve

1986-09-12

1987-06-23

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

1376255, 251 75, F16K 11044

Patent

active

046745262

ABSTRACT:
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.

REFERENCES:
patent: 2651491 (1953-09-01), Ashton et al.
patent: 3008481 (1961-11-01), Matheson
patent: 3533431 (1970-10-01), Kuenzel et al.
patent: 3970100 (1976-07-01), Jones
patent: 4014461 (1977-03-01), Harvill
patent: 4275823 (1981-06-01), Credle, Jr.
patent: 4281677 (1981-08-01), Hoffman
patent: 4354518 (1982-10-01), Kuroda et al.
patent: 4467941 (1984-08-01), Du
patent: 4493435 (1985-01-01), Hartley

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