译文：
它由定差减压阀，液动换向阀和简式节流阀三部分组成。油缸停歇后，调速阀中没有油液流过，减压阀处于全开状态，而液动换向阀处于关闭状态。再次启动时，液压油必须首先打开液动换向阀，同时由于减压阀弹簧腔油压很低，减压阀被抬起，阀口被关小，通过的流量很小。当油缸油压建立起来后，减压阀芯上下两腔受力逐渐达到平衡，维持一个适当的开口，与后面的节流阀一起起调速作用。因此不会出现前冲现象。 新型调速阀的原理及应用 它由定差减压阀、电磁换向阀和两个简式节流阀组成。当换向阀上位接通时，通过的流量由阀调节，当换向阀下位接通时，通过的流量由阀调节。 两种工进速度可以单独调节，由一种工进转入另一种工进时，由于减压阀一直处于减压状态，油缸不会出现前冲现象。而且该回路的速度调节灵活方便。回路发热少，效率高。 新型调速阀在结构上是由两个节流阀共用一个定差减压阀，在定差减压阀与两个节流阀之间嵌入换向阀，与原先用两个调速阀与一个换向阀组成的速度换接回路相比，大大缩小了占用的空间，还简化了回路。调速性能与普通调速阀相同，而速度换接性能却显著提高。这种新型调速阀尤其适用于液压系统集成块尺寸受限制的场合。 新型调速阀和新型调速阀，克服了以前调速阀节流调速回路及工进速度换接回路中的不足，在液压机床上有广阔的发展前景。 　　

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原文：
It is certainly worse by the pressure reducing valve, hydraulic throttle valve and the short form of three parts. Tank stop, the control valve does not flow through the oil, pressure reducing valve is fully open state, while the hydraulic valve is turned off. Again, the hydraulic oil must first open the hydraulic valve, and because low oil pressure relief valve spring chamber, pressure reducing valve to be lifted, I was off valve is small, the flow through very small. When the hydraulic cylinder built up, the valve core upper and lower chamber by the force gradually achieve a balance, to maintain an appropriate opening, and later played with the throttle speed function. Therefore, the phenomenon does not appear pediment. New Theory and Application of Speed Control Valve It is certainly worse by the pressure reducing valve, solenoid valve and the composition of the two simplified throttle. When connected to the upper valve when the flow through the valve adjustment, when the valve connected to the next place, through the flow by the valve adjustment. Into two operating speeds can be individually adjusted by a work into another work entered into, due to pressure reducing valve has been in a vacuum state, the fuel tank does not appear pediment phenomenon. And adjust the speed of the loop flexibility. Loop less heat, and high efficiency. The structure of the new control valve is determined by the difference between the two share a throttle valve, reducing valve in the set difference between the two throttle valve embedded with the original speed control valve with two A valve comprising Speed Exchanging compared to much smaller footprint, but also simplifies the circuit. Speed performance and the same common control valve, while the rate for access performance is significantly enhanced. The new control valve particularly suitable for hydraulic manifold block size limited occasions. New control valve and a new control valve, throttle control valve to overcome the previous speed circuit and work into the Speed Exchanging the deficiencies in the hydraulic machines have broad prospects for development.