Hydraulic servovalve

Details Hydraulic servovalve Hydraulic servovalve

1996-07-11

1997-12-16

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762569, F15B 13043

Patent

active

056974019

ABSTRACT:
A hydraulic servovalve controls the direction of flow of a working fluid and a flow rate of a working fluid between a plurality of ports. The hydraulic servovalve includes a spool axially movably disposed in a valve body for changing a direction of a working fluid and varying a flow rate of the working fluid, a sleeve disposed in the valve body and having a spool hole for housing the spool, a pair of hydrostatic bearings disposed in the sleeve around respective opposite end portions of the spool, and a plurality of windows defined in the sleeve as control orifices for controlling a flow rate of a working fluid. The hydraulic servovalve further includes a fluid passageway communicating between the supply port and the control port through one of the windows, and a fluid passageway communicating between the control port and the return port through the other of the windows.

REFERENCES:
patent: 2920650 (1960-01-01), Moog
patent: 3370613 (1968-02-01), Weaver
patent: 3472281 (1969-10-01), Chiba et al.
patent: 3581772 (1971-06-01), Wills
patent: 3712339 (1973-01-01), Bartholomaus et al.
patent: 3814131 (1974-06-01), Takahashi et al.
patent: 3857541 (1974-12-01), Clark
patent: 4840111 (1989-06-01), Garnjost
patent: 5186213 (1993-02-01), Urata et al.
John F. Blackburn, et al. "Fluid Power Control", Published jointly by The Technology Press of M.I.T. and John Wiley & Sons, Inc. (pp. 185, 189, 208-209, 250-251, 263-264), 1960.

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