Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1983-01-17
1985-01-29
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
G05D 1103
Patent
active
044959621
ABSTRACT:
A fluid control valve assembly for use in a hydraulic system, comprises: a valve body having a valve cavity extending axially thereof and fluid inlet and outlet ports communicating respectively with discharge and suction ports of a fluid feed pump; a valve spool received in the valve cavity and having at least one annular groove formed therein, the valve body and the valve spool defining in combination high-pressure and low-pressure chambers in the valve cavity. The valve body further has a discharge passageway held in communication with the high-pressure chamber through an orifice passageway, a first control passageway having an upstream end open to the high-pressure chamber and a downstream end communicating with the annular groove in the valve spool, a second control passageway having an upstream end and a downstream end open to the discharge passageway, and a third control passageway having one end held in communication with the upstream end of the second control passageway and the other end open to the low-pressure chamber; wherein the valve body is formed with a flow restriction passageway having one end held in communication with the upstream end of the second control passageway and the other end communicating with the annular groove of the valve spool and restricted or closed by the valve spool when the valve spool is axially moved away from the high-pressure chamber.
REFERENCES:
patent: 3028876 (1962-04-01), Gratzmuller
patent: 3618628 (1971-11-01), Kramer
patent: 4244389 (1981-01-01), Shimoura
patent: 4343324 (1982-08-01), Ohe
Hattori Noboru
Suzuki Yoshitomo
Nilson Robert G.
Nissan Motor Company Limited
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