PILOT PRESSURE OPERATED DIRECTIONAL CONTROL VALVE AND OPERATION CYLINDER CONTROL DEVICE

摘要

A pilot pressure operated directional control valve wherein a spool hole having a port is formed in a housing, a spool being slidably fitted in the spool hole such that it is caused to slide by means of a spring and by virtue of pilot pressure led into a pressure receiving chamber, the control valve being characterized in that a spring box is provided on an end surface of the housing as viewed in a longitudinal direction of the spool, and that the spring box has a void portion incorporating therein the spring and constituting the pressure receiving chamber and a pilot pressure intake port communicating with the void portion and made open in the longitudinal direction of the spool.