Automatic switching valve

Details Automatic switching valve Automatic switching valve

1990-06-14

1991-05-14

Cohan, Alan

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

G05D 701

Patent

active

050147331

ABSTRACT:
A valve including spools each responsive to fluid pressure and each spring biased to an open position. Multiple sources of pressure, such as tanks, serve the valve. Tank pressure is directed in sequence through a spool in the open position to an end chamber of the remaining spool to shift the latter spool for uninterrupted passage of fluid pressure into an outlet of the end chamber and past a flow separator spool to a pressure regulator. Switching to a second tank occurs automatically upon a drop in end chamber pressure permitting shifting of a spool to an open position to direct fluid pressure to the end chamber of the remaining spool.

REFERENCES:
patent: 2518894 (1950-08-01), Humbarger
patent: 3658081 (1972-04-01), Renaudie
patent: 3896837 (1975-07-01), Rohling
patent: 3968814 (1976-07-01), Swanson

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