Variable piston pumps for single-acting vane pumps, radial or axial piston pump gear pump and double acting vane pump for dosing pumps are generally complex variable pump, high price;. Variable piston pump outlet pressure by feedback institutional control piston pump swash plate angle v38, thereby controlling the piston stroke was to achieve the purpose of flow control; variable vane pump outlet pressure by a feedback mechanism to control the amount of eccentricity eccentric ring to achieve the purpose of flow control; that is, the variables When the plunger swash plate vertical flow is zero, vane pump empathy. Pump itself can be "positive and negative", it depends on the direction of the swash plate two swings for the job outside of the casing of the pump control module must have variable traction swash plate. As long as the amount of external control some adjustment. Easily complete the swash angle adjustment variable vane pump, which made the variable displacement pump is inevitable. motors (or other power source) forward and reverse rotation driven pump bi-directional rotation, complete back into the oil. Because of their own great power motor rotation inertia piston pump, variable pump can not be quickly brake, reverse, so this approach is only suitable for small power motors (such as large valve opening and closing mechanism), or commutation infrequent systems (such as port opening and closing mechanism grabs ). Domestic variable displacement pump variable pump _ _ creating hydraulic expertise crystal grain from Jinan 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!