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 according to the needs of the franchise called variable pump hydraulic motor (domestic), the flow can not be adjusted called quantitative 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 cleanliness requirements for oil, the price is cheaper; but unbalanced force maintenance shaft by a hydraulic motor (domestic), 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 repairs hydraulic motor (domestic) telephone, materials and processing high precision, expensive, clean of oil high requirements. Hydraulic pump hydraulic motor at rated pressure and rated flow, the motor power can be detected directly from the sample pump. In general, according to the formula to calculate the power required for the motor. When on the steam map Nt gentle curve, according to the work cycle, the maximum power point selection formula: N = (Ps * Qp) / η N-- prime mover power Ps * Qp-- product pump pressure and flow η-- maximum pump efficiency. Gear pumps 0.6-0.7; vane pump 0.6-0.75; 0.8-0.85 maintenance piston hydraulic motor (domestic), hydraulic motors, hydraulic pressure 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!