Piloted pressure relief valve

Details Piloted pressure relief valve Piloted pressure relief valve

1990-07-19

1991-12-31

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

137508, 303116R, 303 68, 303 841, B60T 832

Patent

active

050766473

ABSTRACT:
The piloted pressure relief valve (90) comprises a valve body (92) having a stepped bore (96) which receives a stationary bearing member (110) with a central through opening (117) through which extends a longitudinal extension (137) of a movable piston (130). The movable piston (130) has one end (133) sealingly received within a reduced diameter section (97) of the bore (96) and the opposite longitudinal extension (137) engages a valve member (154) captured between the bearing member (110) and a shoulder of the bore (96). The moveable piston (130) has a longitudinal through passage (132) permitting fluid flow therethrough when the piston (130) moves away from the valve member (154). A spring (140) disposed within the stepped bore (96) biases the piston (130) toward the valve member (154). The relief valve (90) enables a pumpback traction control system (10) to relieve fluid pressure buildup to the master cylinder ( 12) when a predetermined pressure limit is exceeded.

REFERENCES:
patent: 2839078 (1958-06-01), Lornitzo
patent: 4887638 (1989-12-01), Hellquist et al.
patent: 4971400 (1990-11-01), Jonner

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