It consists of fixed valve, hydraulic valve and throttle three parts. After the fuel tank is stopped, there is no oil flow in the governor valve, the relief valve is in the fully open state, and the hydraulic directional valve is in the closed state. Start again, the hydraulic oil must first open the hydraulic valve, at the same time as the valve spring cavity oil pressure is very low, the valve is lifted, the valve port is closed, the flow through the small. When the cylinder hydraulic pressure is established, the relief valve core force gradually up and down the balance between the two chambers to maintain a suitable opening, with the back of the throttle together speed effect. So there will be no rush phenomenon. The principle of the new speed control valve and its application by the fixed valve, solenoid valve and two simple throttle components. When the valve connected to the upper pass, the flow through the valve to adjust, when the valve connected to the next, the flow through the valve to regulate. Two kinds of work rate can be adjusted separately, from one type of work into another into the work, because the pressure reducing valve has been in a state of decompression, the cylinder will not appear hedging phenomenon. And the loop speed regulation flexible and convenient. Circuit fever, high efficiency. The new governor valve structure by the two throttle valve share a fixed valve, valve in the fixed valve and two throttle valve embedded between the switching valve, and the original with two speed control valve A reversing valve composed of speed exchange circuit compared to greatly reduce the occupied space, but also simplify the loop. Speed ​​control performance and ordinary speed control valve the same, but the speed of performance is significantly improved. This new speed control valve is especially suitable for applications where the size of the hydraulic system manifold is limited. The new speed control valve and the new speed control valve to overcome the previous governor valve throttling speed control circuit and the work of speed switching circuit in the lack of hydraulic machine tools have broad prospects for development.
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