Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1980-03-17
1982-01-05
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13762566, G05D 1608
Patent
active
043088880
ABSTRACT:
An adjustable pressure regulator for use with pneumatic or hydraulic fluids can be constructed so as to utilize a spool valve structure capable of being operated so as to prevent flow between first, second and third passages or so as to permit the flow from the first passage to the second while blocking flow to or from the third passage and so as to permit flow from the second passage to the third passage while preventing flow to or from the first passage and first and second position control means located adjacent to the valve structure. The first control means includes a bellows having its interior in communication with the first passage. The second control means also includes a second bellows having its interior in communication with the second passage. The movable ends of these bellows are operatively associated with the valve spool so that the operation of the valve structure is determined by the differential in the forces applied to the valve structure by the movable ends of the bellows.
REFERENCES:
patent: 3225619 (1965-12-01), Schaefer
patent: 3416554 (1968-12-01), Liang
patent: 3766934 (1973-10-01), Fuchs
patent: 3774629 (1973-11-01), Enomoto
patent: 4114650 (1978-09-01), Gordon
Hydraulic and Pneumatic Power and Control, Franklin D. Yeaple, McGraw-Hill Book Co., 1966, pp. 177-183.
Nilson Robert G.
O'Brian Edward D.
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