OPERATING PRESSURE DETECTING CONSTRUCTION OF PILOT PRESSURE OPERATED TYPE DIRECTIONAL CONTROL VALVE OPERATING DEVICE

摘要

A pilot pressure operated type directional control valve operating device comprises in combination a plurality of pilot pressure operated type directional control valves each of which comprises a spool fitted in a spool bore provided in a valve body and having a plurality of ports, valve blocks each provided on both sides of the spool with a pilot pressure receiving chamber and a spring, said spool being adapted to slidably shift to a neutral position and a pressure oil supply position by the spring and an operating pressure in the pilot pressure receiving chamber. An operating pressure detecting construction of the pilot pressure operated type directional control valve operating device is such that provided in the respective valve blocks are oil holes communicating between the valve blocks, and a shuttle valve for allowing the respective oil holes to communicate with the respective pilot pressure receiving chambers, and pressure detecting means is provided in another oil hole which communicates with one of the respective oil holes.