Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Patent
1974-10-31
1976-12-07
Spear, Jr., Frank A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
210136, B01D 2710
Patent
active
039961370
ABSTRACT:
Coaxial bidirectional flow control and relief valves are provided especially suited for use in hydrostat systems containing a filter or filters interposed between a pump and a hydraulic motor, to direct flow in one direction through a filter, and to direct flow in the opposite direction to bypass the filter. The valves are space-saving, can be kept closed under low biasing forces, and can be made light in weight, affording a low-mass valve that can be moved in milliseconds from a closed to an open position. The valves can control not only bidirectional forward and reverse flow paths but also a relief path for flow to bypass a filter which is clogged. When two valves are used, unidirectional flow through can be achieved regardless of direction of flow in the fluid line.
REFERENCES:
patent: 3262567 (1966-07-01), Pall et al.
patent: 3289841 (1966-12-01), Quinting
patent: 3322281 (1967-05-01), Gulick
patent: 3799347 (1974-03-01), McDuffie
Pall Corporation
Spear, Jr. Frank A.
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