登車橋http://www.qdcbgg.com/雙泵供油的疾速運動回路為雙泵供油的疾速運動回路，高壓小流量泵 的流量應略大于最大工進速度所需要的流量，作業壓力由溢流閥調定。登車橋低壓大流量泵與泵的流量之和應等于液壓體系疾速運動所需要的流量，其作業壓力應低于液控次序閥的調定壓力。液控次序閥的調定壓力應比疾速運動時的最高作業壓力高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.

登車橋http://www.qdcbgg.com/疾速運動時，因為負載小，體系壓力較低，閥封閉，泵輸出的油液經單向閥與泵I輸出的油液聚集在一起進人液壓缸，然后完成疾速運動；作業進給時，負載較大，體系壓力升高至大于閥的調定壓力，閥翻開，單向閥封閉，泵卸荷，此刻 體系僅由泵I供油，完成慢速作業進給。這種回路功率使用合理，效率高。但回路較復雜，本錢較高，適用于快、慢速差值較大的液壓體系。
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.