Pulsation limiter for manually actuated hydraulic valve

Details Pulsation limiter for manually actuated hydraulic valve Pulsation limiter for manually actuated hydraulic valve

1985-12-18

1987-04-14

Garrett, Robert E.

Expansible chamber devices

With cushioning means effective over a portion only of stroke

91378, 251 51, 188282, 188316, F01B 1102, F15B 910

Patent

active

046569243

ABSTRACT:
A pulsation limiter for a manually actuated hydraulic valve includes a spring biased, motion retarding plunger in an auxiliary bore within the valve housing and having a helical groove disposed on its periphery abuts against the input sleeve during the initial portion of its travel to actuate the brakes, a check valve in the plunger allowing filling of the expanding cavity in the auxiliary bore behind the motion retarding plunger. When the brake pedal is released partially or completely, the input sleeve moves until it abuts against the plunger. Thereafter, the pressure buildup in the auxiliary bore cavity closes the check valve in the plunger and the input sleeve can only move relatively slowly back to its initial position as the fluid trapped in the auxiliary bore cavity exits through the helical groove.

REFERENCES:
patent: 540346 (1895-06-01), Baker
patent: 2452618 (1948-11-01), Weeks
patent: 2893721 (1959-07-01), Hupp
patent: 4028891 (1977-06-01), Belart
patent: 4287813 (1981-09-01), Chatterjea et al.

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