Electrically operated proportional flow control hydraulic valve and manually operable remote control device therefor

Abstract From the Canadian patent

A proportional fluid flow control hydraulic valve including a valve body in which a by-pass flow passage leads from an inlet port to a by-pass outlet port. A generally cylindrical-shaped valve chamber is arranged between the inlet port and a regulated flow outlet port and the by-pass outlet port. The by-pass flow passage includes an annular auxiliary flow channel which extends circumferentially around the valve chamber. A valve member movably mounted in the valve chamber has valve ports therein for controlling fluid flow from the inlet port and the auxiliary fluid flow channel through the valve member to the regulated flow passage. In one form the valve member is normally disposed in …