The exit flow of the throttle valve exit is related to the adjustment nut opening (the size of the flow area) is related to the front and rear pressure difference between the throttle valve. In order to change the flow rate flowing through the throttle without changes with the load, the other end measures is to keep the differential pressure before and after the flow of the throttle, is maintained as an approximation constant, which is to perform pressure compensation, and thus appears. Control Valve. There are two commonly described in pressure compensation: one is to connect the fixed pressure regulating valve and the throttle valve, constitute a reduced pressure throttle; the other is parallel to the fixed difference overflow valve and the throttle valve. The overflow festival flow type speed control valve. The stability of the overflow speed valve is not as good as the decompression type speed control valve, which is only applicable to the high power stability requirements of less high power in an imported throttle speed hydraulic system.

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