Variable-regeneration directional control valve for construction

Details Variable-regeneration directional control valve for construction Variable-regeneration directional control valve for construction

1996-12-10

1999-01-26

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91436, F15B 1304

Patent

active

058628312

ABSTRACT:
A variable-regeneration directional control valve for construction vehicles is disclosed. The control valve has a pressure control means for controlling the opposite pressure caused by elasticity of a valve spring. The opposite pressure acts on one end of a regeneration switching spool, while a self pressure (hydraulic pressure of pressurized fluid output from a pump) acts on the other end of the regeneration switching spool and thereby moves the spool. In the preferred embodiment, the means is a pressure control piston, which is provided on the end of the valve spring. The pressure control piston receives an outside control signal through an electronic proportional control valve and thereby continuously moves. The electronic proportional control valve outputs pressurized fluid in proportion to a current amount of the outside control signal.

REFERENCES:
patent: 4107923 (1978-08-01), Budzich
patent: 4303091 (1981-12-01), Hertell et al.
patent: 4339927 (1982-07-01), Sarcia
patent: 4642019 (1987-02-01), Sutton
patent: 5615705 (1997-04-01), Cho

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