Flow control valve

Details Flow control valve Flow control valve

1985-09-16

1987-10-20

Schwadron, Martin P.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

137504, G05D 701, F16K 31122

Patent

active

047007338

ABSTRACT:
A flow control valve which exhibits a drooping response, namely, having a response which causes the flow rate supplied to a hydraulic instrument to be reduced as the discharge flow from a pump increases is disclosed. A spool valve is received in a bore, in which a union is disposed and secured. An orifice is formed in the union, and a sleeve is fitted around the union. A restriction which limits the passage of hydraulic fluid therethrough is formed on the external surface of the sleeve. A pressure differential between the upstream and the downstream side of the restriction is effective to cause a sliding movement of the sleeve to thereby reduce the area of the orifice, thus gradually decreasing the flow rate supplied to the hydraulic instrument.

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patent: 4243064 (1981-01-01), Nolte
patent: 4302937 (1981-12-01), Aubert
patent: 4343324 (1980-12-01), Ohe et al.
patent: 4361166 (1982-11-01), Honaga et al.
patent: 4442857 (1984-04-01), Ohe et al.

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