Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1977-05-31
1978-12-26
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
60418, G05D 1610
Patent
active
041311256
ABSTRACT:
An accumulator charging valve has a housing with an inlet and two outlet orifices respectively connected to the pump outlet, to a fluid accumulator and to an open center hydraulic circuit. A main passage is provided between the inlet orifice and the second outlet orifice, with a movable valve member mounted in the main passage, and operated by a differential piston having a face of smaller diameter exposed to the pressure prevailing at the inlet orifice and a face of larger diameter projecting into a control chamber, forming a resilient variable volume enclosure. A leakage passage is provided between the inlet orifice and a low pressure reservoir and has a first portion with an orifice of restricted cross-section situated between the inlet orifice and control chamber, and a second portion also with an orifice of restricted cross-section situated between the control chamber and the reservoir. The first portion comprises pilot means for permitting or interrupting the flow through the leakage passage as a function of the pressure level prevailing in the chamber of the accumulator.
REFERENCES:
patent: 2779346 (1957-01-01), Curlett
patent: 4016895 (1977-04-01), Budecker
Decker Ken C.
Nilson Robert G.
Schoenle Paul David
Societe Anonyme D.B.A.
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