Each piston root out the oil drain plug at the increased pressure acting excavator variable pump, drain acting position just at the bottom of the plunger to the bottom of each of the variables when the drain pump will force outside the top hemisphere, so hemisphere action. Increased pressure, the higher the inclination angle of the top will be outwardly hemispherical, hemispherical smaller, oil flow will be smaller, it can be said, high flow rate and pressure are reduced simultaneously. When the oil encountered load, is exactly equal to the desired pressure pump if the maximum pressure that can be output, and that the system pressure is equal to the set pressure pump. Equilibrium, if the pressure is less than the maximum output of the pump pressure required, nor is it not variable, there is a certain variable, but not all of the variables. If the pressure is greater than the desired maximum output pressure of the pump, the pump also reaches the maximum set pressure, maintaining this pressure in cooperation with the other system components, and will not be damaged. The above, you might look out of the variable displacement pump is not only the highest and lowest output setting, but the linear variable output, at different pressures transform different output displacement. Manual variable displacement axial piston pump, which is characterized by the body and body composition variables; body from the pump casing (12), drive shaft (1), the cylinder (15), a plurality of pistons (11), the shoe (10 ), return plate (9), the return spring (13), the sleeve (20), one-way thrust ball bearings (18), a small spring (14), ball joints (8), thimble (22), retainer holes (19), with the oil pan (16) and pump body (17) composition; shaft (1) and the cylinder (15) between the splined coupling, a plurality of plungers (11) respectively mounted in the cylinder (15) hole on the plunger, the plunger (11) of the ball head and the shoe (10) associated variable pump piston, the shoe (10) in the card return plate (9) on the hole, the return disc (9 ) central hole and a ball joint (8) cooperates, the thimble (22) mounted in the cylinder (15) on the thimble hole, the return spring (13) and bushing sleeve small spring (14) after the (20 ) mounted on the drive shaft (1) and the cylinder (15) between the sales variable displacement pump, the pump body (17) and the casing (12) between the screw associated with the oil pan (16) mounted in the cylinder (15) and (17) between the pump body; hole retainer (19) mounted in the cylinder (15) near one end of the oil pan (16); and variable by the variable housing body (2), the variable head (3), small Dial block (4), dial column (5), variable valve (6) and a large dial blocks (7), with the top screwed in the variable housing (2) variable valve (6), variable head (3) and variable housing (2) through the bush between (23) linked to a small dial blocks (4) mounted on the dial column (5) mounted on the rear in the variable valve (6), the lower dial column (5) inserted in the large dial One end of the block hole (7) on the big dial block (4) with screws in the variable head (3), between the main body and the variables associated with screws, drive shaft (1) through a bearing mounted on the pump ( 17) on the other end by a bearing mounted in the variable housing (2), the one-way thrust ball bearings (18) mounted between the pump (bearings and bushings 17) (20). Piston Pump v | variable displacement pump | 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 continuous improvement to create innovative ideas will lead crystal hydraulic and you hand into the brilliant, for a better future!