Anti jerk valve

Details Anti jerk valve Anti jerk valve

2006-10-24

2006-10-24

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Having means controlling or attenuating shock vibration,...

C060S468000

Reexamination Certificate

active

07124579

ABSTRACT:
A hydraulic control system including a source (11) of fluid having a pressure responsive means (15) and an actuator. A main control valve (21) has ports (27,29) communicating with the actuator ports by means of first (41) and second (43) conduits, and means to generate a load pressure (45). A pressure spike suppression valve (51) has ports connected across the conduits, the valve including a spool (65) moveable between a first position blocking communication between the ports, and a second position permitting communication. The valve (51) defines a spring chamber (67) including a spring (69) biasing the spool toward the first position. The valve defines a load signal passage (83) to communicate the load pressure to a chamber also to bias the spool toward the first position. The valve defines a pressure chamber (81) in communication with the source, fluid pressure therein biasing the spool toward the second position.

REFERENCES:
patent: 3330298 (1967-07-01), Allen
patent: 4040439 (1977-08-01), Uppal
patent: 4838314 (1989-06-01), Gage
patent: 5048296 (1991-09-01), Sunamura et al.
patent: 5050696 (1991-09-01), McGovern et al.
patent: 6176083 (2001-01-01), Ikari
patent: 6474064 (2002-11-01), Heyne et al.

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