Under conditions of constant speed, constant output flow pressure can be mobilized for the variable vane pump, constant pressure and flow are not adjustable for quantitative vane pump. Their biggest difference is that the variable vane pump shaft is installed then the heart. After a simple quantitative terms specializing vane pump speed selected variable pump +, he would certainly flow and pressure, it can not recuperate. Output flow variable vane pump according to the hydraulic system pressure changes (external load size) automatically flow conditioning treatments variable pump +, is the output of high pressure low flow, variable flow pump output pressure is low, so that he can save the number of hydraulic components, thus simplifying the hydraulic system, and can reduce heating oil. The disadvantage is that the flow pulsation serious hydraulic system pressure poised, short life maintenance variable pump pump + phone, pump bearings easily broken, because he was then the heart of the installation, and the big pump bruit. By conditioning eccentricity vane pump, piston slide angle can be achieved through the conditioning variables. Quantitative vane pump works: sealed volume of the stator and rotor valve plate is composed of blade divided into several, one week per revolution of the rotor, each sealed space complete two suction and pressure oil, so called quantitative vane pump. Variable vane pump works: variable vane pump can pitch by changing rotor and stator eccentricity e conditioning pump flow to the hydraulic system at work feeding the energy use of justice, the effectiveness of the high, low temperature of the oil. Eccentric actually change from e achieved only by moving the stator, the rotor and shaft position is the prime mover of the axis defined by the limit-pressure variable vane pump can automatically adjust the flow according to load size, power use is reasonable, can be reduced heating oil, so often used to perform fast or slow component packing requirements or the requirements of the occasion. Fast load is small, low pressure, flow, pump in characteristic curve segment. Slow feed, load, high pressure, low flow, the pump automatically switches to characteristic curve segment. When packing, at near point work, provide a small leakage flow to compensate for this limited-pressure system variable vane pump rated pressure 6.3pa? Care + variable displacement pump, variable pump, hydraulic pressure from Jinan Jing Jing Chong Chong Hydraulic Machinery Co., Ltd. available. 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!