Pilot stage of an electrohydraulic control valve

Details Pilot stage of an electrohydraulic control valve Pilot stage of an electrohydraulic control valve

1996-12-09

1999-06-22

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

13762564, 91 52, B60T 838, E03B 3100, F15B 1302

Patent

active

059135778

ABSTRACT:
A pilot stage of an electrohydraulic control valve controls the position of a pilot actuated main stage by controlling fluid flow through a flow path that connects a supply port to an exhaust port and to an end of the main stage. A proportional valve of the pilot stage has a valve element for establishing a variable flow control orifice to control fluid flow through the flow path and a bleed orifice disposed in the flow path downstream of the proportional valve to generate fluid pressure upstream of the bleed orifice and at the end of the main stage.

REFERENCES:
patent: 4774976 (1988-10-01), Janecke et al.
patent: 5051631 (1991-09-01), Anderson
patent: 5472266 (1995-12-01), Volz et al.
patent: 5562125 (1996-10-01), Bray
patent: 5588463 (1996-12-01), Kervagoret
patent: 5611370 (1997-03-01), Najmolhoda
patent: 5628550 (1997-05-01), Zaviska et al.
patent: 5647645 (1997-07-01), Muller et al.
patent: 5713641 (1998-02-01), Hosoya

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