Digital electro-hydraulic valve arrangement

Details Digital electro-hydraulic valve arrangement Digital electro-hydraulic valve arrangement

1985-01-28

1987-02-03

Scott, Samuel

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

91444, 91450, 137613, 13759617, F16D 3302

Patent

active

046400958

ABSTRACT:
Electro-hydraulic valve arrangements are useful in controlling a displacement control member of a variable displacement pump or motor. However, previous digital electro-hydraulic valves having brief pulse widths required special high speed solenoids to speed up the response time of the valve and resulted in increased cost of the valve. The subject digital electro-hydraulic valve arrangement includes a pair of on/off solenoid actuated valves arranged in series so that a flow path is initiated by a first of the valves and is disrupted by the second valve. The response times of the valves are equal such that directing an electrical signal to the second valve during the response time of the first valve results in extremely brief pulse widths of the valve arrangement. Using two solenoid actuated valves in this manner permits the use of less costly solenoid valves to provide very brief pulse widths through the total valve arrangement.

REFERENCES:
patent: 2183338 (1939-12-01), Slough
patent: 3754565 (1973-08-01), Gennetten
patent: 3851635 (1974-12-01), Murtin et al.

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