Pump before opening the pump, suction pipe and the pump must be filled with liquid. After opening the pump impeller speed rotating D80-30 * 8 multi-stage pump, in which the blades rotate together as a liquid under the action of centrifugal force, left the impeller outside shot D80-30 * 7 multi-stage pump, injection of liquid diffusion pump housing indoor speed gradually slows, gradually increase the pressure from the pump outlet and discharge pipe outflow. 5, sealing ring, also known as Save the drain ring. Too gap caused by the impeller inlet and pump water into the pump housing between the high pressure region through the gap of the low pressure area, the impact of multi-stage pump out the water pump, reduce the efficiency! Gap is too small will cause the impeller and pump casing friction wear. In order to increase the resistance to reduce leakage reflux, delayed impeller and pump housing that life, with sealing ring in the pump casing and impeller foreign aid junction edge, sealing the gap is maintained between 0.25 ~ 1.10mm is appropriate. D80-30 * 4 multi-stage pump | mechanical seal (certified) | Multistage Pump Co. sent by Shijiazhuang-pump. Shijiazhuang-school Pump Co., Ltd. (www.shipaipump.com) is Shijiazhuang, other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Pump in Shijiazhuang-school leadership with the staff warmly welcome all inquiries negotiations to create the Shijiazhuang-pump send a better future.