When the motor is working pressure is lower than the initial pressure variable pressure variable pump · maintenance of telephone, constant pressure control servo valve 7 function in the left position, the servo valve 7 is a section of the oil passage, motor complete control by the pilot pressure. At this point, the big variable cylinder chamber oil passage is closed variable pumps, motors will maintain the current displacement. When the motor is operating pressure continues to rise, the servo valve 7 will be in the left position location function, the variable low pressure oil chamber and a large cylinder is turned, a variable piston moves to the right under the action of the small chamber oil pressure, the motor displacement increases great. We know that if the load torque due to the reason or due to a decrease in motor swing angle of the system pressure increases, when it reaches the set value of the constant control of variable displacement pump · Specialist, motor pendulum swing to a larger angle. When the external load decreases, the motor control process with the above process is reversed, not repeat them here. In short constant voltage control function of the motor is automatically changed according to changes in external load motor displacement, so that the motor operating pressure is kept within the set range. Variable hydraulic variable displacement pump and variable mechanism motor pump has a variety of variables · refinement, which can be divided into two categories: the first category divided according to type manually operated, motorized, electric, hydraulic and electro-hydraulic proportional control control etc., are applied to the signal control variables; second class by adjusting the way to distinguish, which automatically controls the pump (motor) basic parameters (including pressure, flow, power, etc.) change according to certain rules, such as constant power, constant pressure, constant flow. · Variable pump maintenance, 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!