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 swash plate angle control mechanism to control the stroke of the plunger was to achieve the purpose of flow control; variable vane pump outlet pressure feedback mechanism controlled by the eccentricity of the eccentric ring to achieve the purpose of flow control; that is, a variable vertical plunger swash plate when the flow is zero, vane pump empathy. Centrifugal pump works: Before working pump, pump and into the water tank must be filled with water to form a vacuum, when the prime mover driven impeller rotation, forcing the fluid impeller blades rotate at the same time, the fluid in the inertial force Under the action, from the center to the intensive variable flow pump impeller to the edge and out of the impeller at high speed, press out into the room, and then discharged through the diffuser, this process is called pressurized water process. Meanwhile proxy variable pump, the fluid flow impeller center edge, forming a low pressure region in the center of the impeller variable pump, when it has a sufficient vacuum at the suction side under the action of pressure (usually atmospheric pressure), the fluid through the suction chamber into the impeller maintenance variable pumps, this process is called absorption process. Because of the continuous rotation of the impeller, the fluid will continuously discharge, suction, so that centrifugal successive working. It is worth mentioning: it has to start before the centrifugal pump housing later filled with water before start, otherwise will not be able to complete the suction pump, causing the pump heat, vibration, no water, resulting in "idle" damage to the pump (referred to as "gas tied") caused by equipment accidents. Maintenance variable hydraulic pump telephone _ Crystal Chong (certified) _ variable pump provided by Jinan Jing Chong Hydraulic Machinery Co., Ltd .. 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.