Patent ID: 8763632

Claim:
A flow-control valve comprising: a valve housing having an intake port, an outlet port, and a flow passage extending therebetween in which liquid normally flows in a flow direction from the intake port to the outlet port; a upstream valve defining an opening of variable flow cross section in the flow passage adjacent the intake port; a downstream valve defining an opening of variable flow cross section in the flow passage adjacent the outlet port; an intermediate valve defining an opening of variable flow cross section in the flow passage between the upstream and downstream valves; a movable partition connected to the upstream valve and exposed on one side to pressure of liquid at the intake port and on an opposite side to pressure of liquid in the passage downstream of the upstream valve such that a pressure differential across the partition will vary the flow cross section of the upstream valve; an actuator on one side of the housing; an actuating part extending through the housing and connected between the actuator and the intermediate valve for control of the intermediate valve by the actuator on the one side of the housing; a handle on an opposite side of the housing; and an actuating spindle extending through the housing and connected between the downstream valve and the handle for controlling the downstream valve from the handle on the opposite side of the housing.