Electrically controlled pressure-holding valve

Details Electrically controlled pressure-holding valve Electrically controlled pressure-holding valve

1995-08-09

1996-09-24

Michalsky, Gerald A.

Fluid handling

Systems

Hydraulic brake line

188353, 192 13A, 25112902, 477198, B60T 1536, B60K 4124

Patent

active

055581234

ABSTRACT:
A pressure-holding valve for a brake system having a body with a blind bore therein. The body has a first passage which connects the blind bore with a variable pressure inlet port and a pressure outlet port. The blind bore is closed by seals carried on a plug having an axial passage therein connecting said inlet port with a second passage connected to the first passage. A non-return valve is located in said blind bore between the plug and the bottom of the blind bore while a valve controlled by an electromagnet is locate in the plug. In response to an operational signal the valve controlled by the electromagnet is moved into engagement with a seat to interrupt communication between the inlet port and the first passage. If the pressure holding valve is on an incline plane, the non-return valve moves to close the axial passage to prevent the return of pressurised fluid from the outlet port toward the inlet port and thereby maintain the fluid pressure in the system at a value of the fluid pressure at the outlet port to sustain a brake application.

REFERENCES:
patent: 2596779 (1952-05-01), McCoy
patent: 3759293 (1973-09-01), Tanaka
patent: 4658942 (1987-04-01), Kubota et al.
patent: 4802563 (1989-02-01), Kojima et al.
patent: 5316378 (1994-05-01), Maehara

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