The speed control valve is a combined valve composed of a constant differential pressure reducing valve and a throttle valve connected in series. The throttle valve is used to regulate the flow rate passing through, while the constant difference pressure reducing valve automatically compensates for the influence of load changes, keeping the pressure difference before and after the throttle valve a constant value and eliminating the impact of load changes on the flow rate.
The pressures before and after the throttle valve are respectively led to the right and left ends of the valve core of the pressure reducing valve. When the load pressure increases, the liquid pressure acting on the left end of the pressure reducing valve core increases, the valve core moves to the right, the pressure reducing port increases, and the pressure drop decreases, thereby keeping the pressure difference of the throttle valve constant. And vice versa. In this way, the flow rate of the speed control valve remains constant (not affected by the load). The speed control valve can also be designed with a structure that throttles first and then reduces pressure.
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