Quantitative pump system, if you want to speed on the job, then generally only use variable speed throttle pump, so it is more powerful domestic energy waste variable pump for low power systems, power is already small, wasted little too Nothing, power systems waste up to much, so less power metering pump + throttle speed program. Variable pump can be volume control, greatly reducing energy than throttle speed variable displacement piston pump, for high-power systems, energy consumption is very important evaluation factor. 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 adjust the angle made such a variable displacement pump is inevitable. motors (or other power source) forward and reverse rotation, two-way rotary vane pump driven variable displacement pump, complete back into the oil. Because of their own great power motor rotation inertia not 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 opening and closing mechanism grabs the port). Finishing variable pump crystal Seiko create hydraulic repair (certified), 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.