2. The characteristics of the hydraulic pump (1) having a plurality of sealing the space and because changes periodically. And the volume change amount of frequency change per unit of time and the pump output flow is proportional to the space within, regardless of other factors. (2) the absolute pressure of the liquid in the tank must be identically equal to or greater than the atmospheric pressure. This is a positive displacement pump oil can be inhaled external conditions. So as to ensure the normal suction pumps hydraulic motors overhaul, tank must be vented to the atmosphere, or the use of sealed sub tank filling. (3) have a corresponding assignment mechanism. The suction tank and discharge tank separated pump regularly to ensure continuous suction liquid. When the suction valve 5 is closed and 6 open; when the oil pressure of the hydraulic motor is detected, the valve 5 open, 6 closed. 2, displacement and flow (1) per revolution displacement hydraulic pump V, the volume of liquid discharged by sealed volume changes calculated geometry called displacement pump. Displacement hydraulic pump can be adjusted is called a variable pump; pump displacement can not be adjusted is called a metering pump. (2) Theoretical Theoretical flow refers to the flow rate at the leakage flow rate of the hydraulic pump without considering the conditions, the liquid volume discharged per unit time. If the pump displacement V hydraulic motor, which spindle speed is n, then the pump flow rate qt theory is qt = Vn where V is the pump displacement (m3 / r), n is the spindle speed (r flow ql / s) liquid volume (3) the actual flow qt hydraulic conditions within a particular hydraulic motor repair, discharge per unit time is called the actual flow rate, which is equal to the theoretical flow qt minus leakage and compression loss after that q = qt a ql (4) qn nominal flow under normal operating conditions, the test standards (such as at rated pressure and rated speed) must ensure that traffic. Acting hydraulic motors | hydraulic motors | 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 constantly improving innovative ideas will lead crystal create hydraulic and you hand into the brilliant, for a better future!