Valves and valve actuation – Fluid actuated or retarded – Dashpot or fluid controlled retarder or timer
Patent
1982-08-02
1984-11-27
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Dashpot or fluid controlled retarder or timer
251 55, F16K 31122
Patent
active
044847262
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: 2500555 (1950-03-01), Majneri
patent: 2679263 (1954-05-01), Kiser et al.
patent: 3316031 (1967-04-01), Henry-Biabaud
patent: 3450381 (1969-06-01), Guin
patent: 3631887 (1972-01-01), Fellbach et al.
patent: 4287813 (1981-09-01), Chatterjea et al.
patent: 4340234 (1982-07-01), Ise
Deutsch Barry E.
Dresser Industries Inc.
Rivell John A.
Schwadron Martin P.
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