Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1980-12-08
1983-05-31
Schwadron, Martin P.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
13759615, 13762414, 251297, G05D 1610
Patent
active
043856390
ABSTRACT:
A self-cycling valve including a main valve and an operator valve. The main valve comprises a body having an inlet port, an exhaust port, and two outlet ports, and valve elements for controlling communication between each outlet port and the inlet and exhaust ports. The operator valve has a valve member movable between two extreme positions for controlling operation of the valve elements of the main valve. In one extreme position of the valve member, one outlet port of the main valve communications with the inlet port and the other outlet port communicates with exhaust; in the other extreme position of the valve member, the outlet port connections are reversed. The valve member of the operator valve cycles between its extreme positions in response to fluid pressure levels at the outlet ports of the main valve. A spring-biased, pivoting detent urges the operator valve member into each of its extreme positions, the spring force being applied to the detent along a line transverse to the direction of movement of the valve member, so that the biasing force decreases during the movement of the valve member from each extreme position toward its midpoint of travel and increases during movement of the valve member from the midpoint of its travel to the other extreme position. Pistons at opposite ends of the operator valve member respond to fluid pressures at the outlet ports, respectively, for moving the valve member back and forth between its two extreme positions.
REFERENCES:
patent: 1920003 (1933-07-01), Chenault
patent: 3051188 (1962-08-01), Tilney
patent: 3080887 (1963-03-01), Brandenberg
patent: 3614965 (1971-10-01), Metivier
patent: 3996956 (1976-12-01), Taft
patent: 4029119 (1977-06-01), Klieves
patent: 4037617 (1977-07-01), Perales
patent: 4285268 (1981-08-01), Deckler
Automatic Switch Company
Levine Alan H.
Schwadron Martin P.
Shay James R.
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