Due to the impact the efficiency of the transmission, hydraulic "constant power" Governor's ratio is limited. By "dosing pumps - variable motor" constant power speed systems and - Characteristics "Quantitative variable pump motor" constant power control system of analysis, we can see that each speed ratio is not very large. In addition, several aspects of the efficiency of the device power, maximum flow rate of the system to compare variable pump testing, before a system is better than the latter. So generally do not use the latter. Variable pump pressure low flow, high pressure flow is small, the flow is automatically adjusted according to the pressure. The purpose is to save energy. Because most of the press are to be pressure-hour traffic, it is only a small flow rate to the high pressure. Relief valve is automatically opened overflow relief at a set pressure. The purpose is to limit the pressure, avoid overload, security. There are simply discharged for a certain pressure off the excess traffic. If there is no relief valve, pressure pump may not be limited to increased variable pump until the pump itself can reach the maximum pressure. This is overloaded, you may want to damage the equipment was. So, with variable pump can not remove relief valve. Variable pump accessories, variable pump, hydraulic preferred by the Jinan Jing Jing Chong Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead crystal create hydraulic and you hand into the brilliant, for a better future!