Hydraulic pressure control valve

Details Hydraulic pressure control valve Hydraulic pressure control valve

1990-12-17

1991-10-22

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762569, F15B 1302

Patent

active

050586262

ABSTRACT:
A hydraulic pressure control valve includes a valve body having a slide bore with a circular cross-section, an inlet port opened in an inner surface of the slide bore, a control pressure port and an outlet port at axially spaced-apart distances in this sequence; a valve spool axially slidably fitted in the valve body; and a first variable orifice and a second variable orifice both formed between the valve body and the valve spool. The first variable orifice controls the degree of communication between the inlet port and the control pressure port, and the second variable orifice controls the degree of communication between the control pressure port and the outlet port. In this hydraulic pressure control valve, the valve spool has smaller diameter portions coaxially formed therein to define annular oil passages between the inner surface of the slide bore and the valve spool and each smaller diameter portion has an outer diameter set uniformly over the axially entire length thereof.

REFERENCES:
patent: 3018041 (1962-01-01), Browell
patent: 3589401 (1971-06-01), Harding
patent: 3964372 (1976-06-01), Chatterjea
patent: 4069843 (1978-01-01), Chatterjea
patent: 4139985 (1979-02-01), Ruhl et al.
patent: 4923170 (1990-05-01), Takaoka et al.

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