Pressure medium valve

Details Pressure medium valve Pressure medium valve

1988-10-27

1990-03-06

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 44, F16K 31124

Patent

active

049059599

ABSTRACT:
Pressure medium valve having a valve piston located in a valve housing for control of a main pressure medium flow through the valve by the aid of a pilot flow through a variable pilot flow restriction disposed in the valve piston, the pilot flow being derived from the main pressure medium flow and being controllable by means of a control pilot valve. To achieve temperature independent control without area increase in the pilot flow chambers, an additional restriction between the valve piston and the cylindrical wall surrounding the valve piston of the valve housing is incorporated. The additional restriction has the form of a peripheral clearance of a substantially greater axial length than height.

REFERENCES:
patent: 1046236 (1912-12-01), Wagner
patent: 2055576 (1936-09-01), Hollerith
patent: 4535809 (1985-08-01), Andersson
patent: 4779836 (1988-10-01), Marklund

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