Valve device for selectively connecting a pressure gauge

Abstract From the Canadian patent

A rotary valve device for the selective connection of a pressure sensing device to any one of a number of separate pressure lines in a hydraulic control system the se-, lector valve comprising a cylindrical valve base with axial pressure line bores on a circle and a pressure relief bore on a larger radius, each bore having arranged therein a spring-loaded valve with a valve plunger whose protruding head cooperates with a rotatable selector disc. The selector disc, settable by means of a selector sleeve carries a, selector cam for the pressure line valves and a series of pressure relief cams for the pressure relief valve which is opened half-way between adjacent pressure line connection …