Flow control valve unit

Details Flow control valve unit Flow control valve unit

1993-02-16

1994-08-02

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

91426, 91444, 13759612, 137117, F16D 3102

Patent

active

053334540

ABSTRACT:
A connector 5 having an outlet 4 for delivering a pressure oil to a power steering apparatus PS is secured in an opening of a valve receiving bore 2 in which a flow controlling spool valve 3 is received. The connector 5 includes an axial bore 5a which continues from the outlet 4 and in which a valve sleeve 10 is slidably fitted. The valve sleeve 10 has pressure oil passages 11, 12 therein in which orifices 13, 14, 15 are formed, and pressure differentials thereacross are utilized to operate the spool valve 3 in order to return an excess amount of flow. At its outer end, the valve sleeve 10 is formed with a flange 10b, and a restriction 20 is defined between the outer peripheral surface of the flange 10b and the internal peripheral surface of the valve receiving bore 2 for restricting the flow rate of the pressure oil. A pressure differential developed across the restriction 20 is effective to move the valve sleeve 10 to control the orifices 14, 15 so that the latter may be reduced.

REFERENCES:
patent: 4343324 (1982-08-01), Ohe et al.
patent: 4361166 (1982-11-01), Honaga et al.
patent: 4396033 (1983-08-01), Narumi et al.
patent: 4469011 (1984-09-01), Loffler
patent: 4549566 (1985-10-01), Fujiwara et al.
patent: 4700733 (1987-10-01), Uchino
patent: 4753264 (1988-06-01), Uchino et al.

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