Refers to a two-way variable pump pump, variable pump finishing in case the same direction of rotation of the prime mover, such as changing the method by changing the variable displacement mechanism tilt direction or the compression ratio of the axial piston pump swash plate and other means. Examples such as the original is northeast - southwest direction, to the northwest - southeast direction, the variable pump suction port becomes the original oil outlet, original oil outlet into a suction port variable pump sales, which changes the flow stream. In closed loop, thus changing the direction of rotation of the load, such as rotating swash plate and cylinder swash plate pump exists in the cylinder plunger while absorbing, while oil pressure. Edit difference variable pump and a metering pump 1. In the variable vane pump, the oil pressure when the blade is in the zone, the bottom of the blade through the variable pressure oil pump, when the blade is in the sucking section, the bottom of the blade through the suction chamber, so that the top of the blade and fluid pressure at the bottom of the basic balance, which avoids the quantitative vane pump stator surface area within the suction serious wear problems. If you still pass the oil pressure in the suction chamber at the bottom of the blade, the top surface of the stator blade will give greater friction force, so that weakened the pressure feedback effect. 2. The blade also has the inclination, but the tilt direction exactly opposite vane pump and quantitative proxy variable displacement pump, it is because the blade down pressure variable vane pump is balanced blade movement outward centrifugal suction area rely mainly on the role of its rotation. According to mechanical analysis, this is more conducive to the blade tilt direction extending outwardly in centrifugal effect. 3. The variable vane pump complex structure, large contour size, multiple parts in relative motion, the larger the leak, the shaft radial hydraulic pressure imbalance, noisy, volumetric and mechanical efficiency are not fixed displacement vane pump is high; However, it can automatically adjust the pressure according to the load flow, power use is reasonable, can reduce heating oil. Variable pump maintenance, crystal creating hydraulic (certified), variable pump 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.