Synthesized flow-control servovalve

Details Synthesized flow-control servovalve Synthesized flow-control servovalve

1992-03-13

1993-08-31

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

91433, 13762564, F15B 13043

Patent

active

052400417

ABSTRACT:
An improved two-stage servovalve (70) has a pilot-stage and an output-stage. A torque motor (16) produces pivotal movement of a flapper (18) in response to a supplied electrical current. The pilot-stage produces a flow which is used to selectively displace a second-stage spool (61) relative to a body bore. The servovalve has a hydromechanical pressure feedback loop closed about the load and second-stage spool. The pressure feedback loop is intertwined with an electrical spool position feedback loop closed about the spool and driver. The command to the pressure loop is a function of the error of the spool position loop. The gain of the spool position loop dominates that of the pressure loop. The valve has pressure-flow characteristics approximating those of a "flow-control" servovalve but affords access to an electrical signal substantially proportional to the load pressure differential.

REFERENCES:
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patent: 2953123 (1960-09-01), Reen et al.
patent: 2964059 (1960-12-01), Geyer
patent: 3390615 (1968-07-01), Hayner et al.
patent: 3464318 (1969-09-01), Thayer et al.
patent: 3555970 (1971-01-01), Borgeson et al.
patent: 3757823 (1973-11-01), Knutson
patent: 4061155 (1977-12-01), Sophia
patent: 4456031 (1984-06-01), Taplin
patent: 4623003 (1986-11-01), Leonard
patent: 4635682 (1987-01-01), Walters
patent: 4938118 (1990-07-01), Wolfges et al.

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