Pressure control valve

Details Pressure control valve Pressure control valve

1998-08-18

1999-06-15

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

91433, F15B 13043

Patent

active

059112441

ABSTRACT:
A pressure control valve system for a friction device has a regulator valve with a plurality of pressure feedback differential areas which are selectively pressurized during the engagement of a friction device to control the apply pressure at one rate during normal operation and at a higher rate during high torque demand operation. A plug valve is disposed adjacent the regulator valve to establish two variable control forces acting on the regulator valve in response to a variable control pressure. The combination of the differential areas and the plug valve permit the regulator valve to establish two distinct pressure gain functions, each of which has a knee or inflection point resulting in two pressure gain ratios.

REFERENCES:
patent: 4617968 (1986-10-01), Hendrixon
patent: 5492028 (1996-02-01), Raszkowski
patent: 5496231 (1996-03-01), Eaton
patent: 5564543 (1996-10-01), Wilson
patent: 5601506 (1997-02-01), Long et al.
patent: 5616093 (1997-04-01), Long et al.
patent: 5643125 (1997-07-01), Long et al.
patent: 5669473 (1997-09-01), Long et al.
patent: 5685408 (1997-11-01), Long
patent: 5738608 (1998-04-01), Long

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