Initial displacement of the largest displacement motor, when the working pressure is lower than the set pressure valve 7, valve 7 can not afford to control action, motor displacement with X port pilot control pressure changes between the maximum and minimum infinitely variable, in order to achieve the pilot pressure control. Variable pump motor repair phone when A, B port to provide any work pressure oil * When pressure oil can enter the variable cylinder small chamber 5 through the check valve. When X port pilot pressure increases variable pump Training *, pilot control oil pressure acting on the valve a force to overcome the spring force regulator spring 2 and 3, to promote a move to the right valve, when the pilot pressure is increased to motor variable initial pressure, the valve will be in a neutral position. If the pilot pressure continues to rise, the servo valve will be further to the right, one in the left position servo valve function, motor working pressure oil through a valve into the variable cylinder 5 and 7 large cavity. Due to the variable area of ??the piston 6 is not equal at both ends, when both ends of the role of oil under pressure, variable piston moves to the left, fixed variable piston lever will drive the oil pan and cylinder swing, so the cylinder and the spindle reduce the angle between the variable displacement pump care *, so that the motor displacement decreases. When X port control pressure is reduced, the motor control process with the above process is reversed, not repeat them here. In summary, when the pilot pressure to terminate the pressure change between the initial pressure and variables in the variable variable pump, motor displacement will change accordingly between the maximum and minimum. Variable pump and variable motor speed control loop is often applied to the composition of the volume of open and closed-circuit hydraulic system. Volume loop speed control circuit by changing the pump or hydraulic motor to achieve the speed of displacement. Its main advantage is a small power loss (no overflow losses and throttle loss) and the working pressure varies with the load, so that a high efficiency, low temperature of the oil, especially for high-speed, high-power systems. Variable pump repair phone *, variable pump, hydraulic from 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 continuous improvement to create innovative ideas will lead crystal hydraulic and you hand into the brilliant, for a better future!