Variable type of pump, the output pressure is less than it is set constant pressure, the output pressure of the oil full displacement, i.e. quantitative output, when the output fluid pressure reaches the set pressure, the pump flow rate is automatically adjusted to ensure constant pressure variable pump maintenance, to meet the system requirements. Pump output constant value of the variable pump models, variable pump as needed, in the pressure range can be set stepless adjustment, the structure of the pump output pressure of the oil at the same time to control the oil inlet through the lower chamber and piston variable and constant pressure valve , when the output pressure is less than it is set constant pressure, constant pressure acting on the spool of the hydraulic thrust is smaller than it is set spring force, damage. Piston pump works schematic diagram; the drive shaft with a rotation by diesel engines, and drive cylinder rotates, the cylinder piston and the cylinder rotates together. Excavators variable swash plate pump does not rotate around its center point just swing around. The left end of the spherical portion of the plunger to slide on the swash plate. When the plunger to the above figure below, the axial position of the plunger at the bottom dead center went dead and go on a trip. In this case the suction of the plunger a certain amount of oil. As the plunger continues from a lower position to an upper position again when it and from the top dead center in the axial direction come lower dead point, the suction of a quantity of oil discharged from the drain hole. This is the pump discharge pressure oil. Each cylinder 1 a plunger, which is spinning cylinder with oil pump continuously from the hydraulic tank suction and discharge pressure of the hydraulic oil. Variable Pump Repair | crystal create a trusted (authenticated) | Binzhou 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.