登车桥http://m.iyunsun.com/双泵供油的疾速运动回路为双泵供油的疾速运动回路，高压小流量泵 的流量应略大于最大工进速度所需要的流量，作业压力由溢流阀调定。登车桥低压大流量泵与泵的流量之和应等于液压体系疾速运动所需要的流量，其作业压力应低于液控次序阀的调定压力。液控次序阀的调定压力应比疾速运动时的最高作业压力高0.5 -- 0.8MPa。
Ramps double pumps the rapid movement of the loop for the double pump oil fast motion loops, high pressure low flow pump flow should be slightly larger than the maximum flow rate required to work into the job by the pressure relief valve setting. Ramps flow of low pressure high flow pump and pump and hydraulic system should be equal to the required rapid movement of traffic, its operating pressure should be lower than the set pressure of the hydraulic control valve order. Set pressure of the hydraulic control valve should be higher order than the highest operating pressure of rapid movement of 0.5 - 0.8MPa.

登车桥http://m.iyunsun.com/疾速运动时，因为负载小，体系压力较低，阀封闭，泵输出的油液经单向阀与泵I输出的油液聚集在一起进人液压缸，然后完成疾速运动；作业进给时，负载较大，体系压力升高至大于阀的调定压力，阀翻开，单向阀封闭，泵卸荷，此刻 体系仅由泵I供油，完成慢速作业进给。这种回路功率使用合理，效率高。但回路较复杂，本钱较高，适用于快、慢速差值较大的液压体系。
Ramps when fast motion, because the load is small, low system pressure, the valve closed, the pump output of oil through the check valve and the pump I output the oil into the cylinders together, and then complete the fast movement;when the job feed, load a larger system pressure increases to the set pressure is greater than the valve, the valve open, the check valve closed, pump unloading system at the moment only the oil from the pump I, completed the slow job feed. This loop power use reasonable and efficient. However, the circuit is more complex, higher costs for fast, slow the larger the difference between the hydraulic system.