Torque, speed, pressure. Three are interacting maintenance pump (domestic), a parameter has changed, the other two have to change. Must be determined in accordance with the load torque. Then consider the speed of the motor to determine the type and then determine the pressure, take a look at the feasibility of the selected motor types. No words have weight to service the pump (domestic), for a motor types. After determining the pressure and speed, we can determine the motor displacement. Hydraulic pump flow can be adjusted according to whether the classification can be divided into: variable displacement pump and dosing pumps. Output flow can be adjusted as needed is called variable displacement pump, the flow rate can not be adjusted is called a metering pump. Commonly used by the hydraulic system pump structure is divided into: gear pumps, vane pumps and piston pumps three kinds. Gear pumps: smaller, simpler structure, strict requirements for cleanliness oil pump, the price is cheaper; but the shaft by the unbalanced force, badly worn, leaking large. Vane pump: divided double acting and single acting vane pump vane pump. The pump flow evenly, smooth operation, low noise, high efficiency for the pressure and volume than the gear pump, complex structure than the gear pump. Piston: high volumetric efficiency, the leak is small, can work under pressure, mostly for high power hydraulic system; but the complex structure, materials and processing high precision, expensive, high oil cleanliness requirements. Acting pump (domestic) _ hydraulic pump _ 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!