The actual working pressure of the pump is determined by the size of the load, and then a big load of course, can not exceed the maximum pressure of the pump design. If the dosing pumps, flow through an external valve adjustment you will not change the output pressure of the pump, but if your load is very small, even the oil pump are back in the tank, and that the pump can not build up pressure. If the variable displacement pump, it is a great relationship (hydraulic motor) specializing in specific flow curve depends on some pressure hour, traffic flow; pressure, the flow is small. For example, constant power variable pump. Hydraulic motor, speed is increased is also limited by the back pressure. E.g., crankshaft connecting rod type hydraulic motor (hydraulic motor) maintenance, speed is increased when the hydraulic motor, the oil return back pressure must be significantly increased in order to ensure the link will not strike the surface of the crankshaft, thereby avoiding collision phenomenon. As the speed increases, the required return value back pressure oil chamber should also be increased. But excessive increase back pressure of the hydraulic motor efficiency will drop significantly. In order to make the efficiency of the motor is not too low, the motor speed should not be too high. (Hydraulic motor) sales, crystal create a hydraulic (certified), hydraulic motor from Jinan Jing Chong hydraulic machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) Shandong Jinan, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In the crystal to create a hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal to create a better future for the hydraulic.