Pressure relieving linear motion valve

Details Pressure relieving linear motion valve Pressure relieving linear motion valve

1986-04-17

1987-06-23

Michalsky, Gerald A.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

91446, 91459, 137488, 1376253, 187110, 25112911, F15B 13044

Patent

active

046745270

ABSTRACT:
The point at which pump out pressure exceeds load is sensed to provide a point for scheduling flow to an actuator in a hydraulic system. Flow is controlled by a stepper motor (28) that moves a flow control valve (27). The steps needed to achieve fixed flow changes are greater for high flow positions. When the pump (21) is turned on, the valve (27) is positioned to bypass flow; the bypass flow is then programmably decreased to the actuator. Reverse flow is regulated by the valve (27) to control actuator retraction. Reverse flow is initiated by opening a check valve (40) with an actuator (50) that opens it first to reduce pressure across the valve, then fully. The flow control valve (27) also operates to relieve excess pressure in the system.

REFERENCES:
patent: 3842943 (1974-10-01), Nakamura et al.
patent: 4239179 (1980-12-01), Geier
patent: 4318332 (1982-03-01), Shingu et al.

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