Patent ID: 6283149
Filing Date: 2001-09-04
Classification: F15B,Y10T

Abstract:
A directional control valve having a position detecting function, comprising:a plurality of ports;a valve hole, wherein each of said plurality of ports is opened to said valve hole;a casing having said plurality of ports and said valve hole therein;a valve member for changing over fluid flow passages, said valve member being received in said valve hole;driving means for driving said valve member;a magnet installed so as to be displaced in synchronization with said valve member, said magnet being disposed at a position which is shut off from said fluid flow passages, and which is adjacent to at least one end of said valve member;at least one magnetic sensor installed so as to be able to detect magnetism from said magnet, said at least one magnetic sensor being disposed at a portion opposite to said magnet in said casing;breathing chambers opened to an outside, each of said breathing chambers being disposed at positions facing end faces of said valve member;end sealing members for shutting off said breathing chambers from said fluid flow passages in said valve hole, said end sealing members being installed on outer peripheries of end portions of said valve member; andsaid magnet being installed at a first end portion of said end portions of said valve member, said first end portion being adjacent to one of said breathing chambers and being more exterior that one of said end sealing members.