Electro-hydraulic valve-actuator system

Details Electro-hydraulic valve-actuator system Electro-hydraulic valve-actuator system

1991-08-02

1992-03-24

Cohan, Alan

Fluid handling

Processes

13762412, 137569, 60394, F16K 31122

Patent

active

050978578

ABSTRACT:
An electro-hydraulic valve-actuator system (30) includes an electric motor (58) for driving a hydraulic pump (60), with an electrical control circuit (68) energizing the electric motor to thereby furnish hydraulic fluid to a valve actuator (16). A timer (90, 92) times activation of the electric motor and extinguishes such activation at expiration of a time period required to approximately move a valve (22) to a desired position. A four-way electric solenoid valve (66) is coupled to the electrical control circuit for channeling pumped hydraulic fluid to either close or open the valve. An adjustable hydraulic bypass relief valve (76) is coupled to the hydraulic pump for establishing a hydraulic-fluid pressure provided by the pump. Individual electro-hydraulic valve-actuator systems of this invention can replace a pneumatic valve-actuator system, or electro-mechanical valve actuators.

REFERENCES:
patent: 3195879 (1965-07-01), Bond
patent: 3475000 (1969-10-01), Fry et al.
patent: 3553965 (1971-01-01), Lathrop
patent: 3630025 (1971-12-01), Henry
patent: 4268007 (1981-05-01), Chittenden
patent: 4744542 (1988-05-01), Heusser

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