Low current electro-hydraulic metering module

Details Low current electro-hydraulic metering module Low current electro-hydraulic metering module

1993-11-17

1996-09-10

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

13762563, 13762564, F16K 31124

Patent

active

055538274

ABSTRACT:
A fluid flow control device of the type having a spool valve mechanically biased toward a neutral position, a movable fluidic control such as a jet pipe for selectively moving the spool valve from its neutral position, a torque motor movable from a neutral position in response to a driving signal for positioning the fluidic control, a sensor for sensing the position of the spool and providing an output signal indicative thereof, and electronic control circuitry including a feedback circuit which utilizes the sensor signal to selectively modify the torque motor driving signal includes a second feedback arrangement which responds to the position of the fluidic control to modify the spool position. The second feedback arrangement may take the form a resilient mechanical coupling between the spool and the fluidic control and is operable independently of the sensor and feedback circuit.

REFERENCES:
patent: 3326088 (1967-06-01), Hayner et al.
patent: 3946757 (1976-03-01), Wallace
patent: 4040599 (1977-08-01), Smith
patent: 4061155 (1977-12-01), Sopha
patent: 4202171 (1980-05-01), Jurisch et al.
patent: 4227443 (1980-10-01), Toot
patent: 4456031 (1984-06-01), Taplin
patent: 5174339 (1992-12-01), Pickard
patent: 5244002 (1993-09-01), Frederick

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