JPS56131805A - Combination valve - Google Patents

Abstract

PURPOSE: To simplify the structure of a pressure compensating valve in a combination valve provided with a directional control valve and a pressure compensating valve by a structure wherein when the operating amount of the directional control valve exceeds a certain value, nearly the same pressure is given to the pressure chamber of the pressure compensating valve as to the spring chamber thereof.

CONSTITUTION: The directional control valve 2 having passages 20a, 20b connected with pressure chambers 13, 15 of an actuator 1 through ducts 14, 16 is provided with a spool 25 for connecting or disconnecting a discharge passage 24 and the like connected with a bridge passage 23, a tank 9. The pressure compensating valve 4 is made up so that a valve body 51 is inserted slidably into an inner hole 45 having an annulur groove 42 connecting with a pressure fluid source 3 and an annulur groove 43 connecting with annulur grooves 27a, 27b of the valve 2 and this valve body 51 is pushed by a spring 54 toward a pressure chamber 52. The fluid pressure from the fluid source 3 is controlled suitably by moving the valve body 51 in accordane with the difference between the fluid pressures which act in the pressure chamber 52 and the spring chamber 53.

COPYRIGHT: (C)1981,JPO&Japio