Fluid handling – Systems – Multi-way valve unit
Patent
1979-10-01
1981-05-05
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
251 31, 251126, F15B 13042, F16K 3140, F16K 31383
Patent
active
042652723
ABSTRACT:
A control valve assembly (10) is provided for controlling a hydrostatic transmission including a fluid pump having a variable swashplate, a source of control fluid under pressure, and a servo system responsive to the control fluid for varying the swashplate of the fluid pump. The control valve includes a valve body (12), first (26) and second (28) fluid chambers disposed in the valve body, a first fluid passageway (30) disposed in the valve body for directing pressurized control fluid to the first and second fluid chambers and a valve member (16) located in the valve body for controlling the flow of control fluid to the servo system. The pressurized fluid in the first fluid chamber acts on the valve member to bias the valve member in a first direction and the pressurized fluid in the second chamber acts on the valve member to bias the valve member in the second direction opposite the first direction. A viscosity sensitive restriction (64) is disposed in the first fluid passageway and control fluid is directed therethrough to the first and second fluid chambers. The viscosity sensitive restriction maintains substantially equal pressures in the first and second chambers upon initial pressurization thereof. The fluid flow through the viscosity sensitive restriction is laminar and has a Reynolds number of less than 2,000.
REFERENCES:
patent: 3035593 (1962-05-01), Page
patent: 3646762 (1972-03-01), Hawk et al.
patent: 3791619 (1974-02-01), Pett
patent: 3857541 (1974-12-01), Clark
patent: 3934812 (1976-01-01), Pett
Cornell Charles R.
Klimowicz Michael A.
Eaton Corporation
McCloskey R. J.
Michalsky Gerald A.
Union M. L.
Yakimow J.
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