The so-called self-priming pump, is not required before the start of irrigation (after the installation of the first start still need irrigation), after a short period of operation, by the pump itself, that is, the water can be sucked up, put into normal jobs. Now take a look at self-priming pump categories and their working principle. Self-priming pump self-priming pump according to the working principle is divided into the following categories: 1. Gas-liquid hybrid (including the internal and external mix) Gas-liquid hybrid self-priming pump work process: As the self-priming pump body Structure, after the pump stops, there is a certain amount of water in the pump body. After the pump starts again, due to the rotation of the impeller, the air and water in the suction pipe are fully mixed and discharged to the gas-water separation chamber and the gas in the upper part of the gas-water separation chamber Overflow, the lower part of the water back to the impeller, re-intake pipe and the remaining air mixed until the pump and the suction pipe all the gas discharge, to complete self-absorption, and normal pumping. 2. Water ring wheel water ring wheel self-priming pump is the water ring and pump impeller combination of a shell, with the water ring to the gas discharge, to achieve self-absorption. When the pump is working properly, the valve of the water ring and the pump impeller can be cut off by the valve, and the liquid in the water ring wheel can be released. 3. Jet (including liquid jet and gas jet) Jet self-priming pump by the centrifugal pump and jet pump (or injector) a combination of relying on the jet device, resulting in a vacuum nozzle to achieve suction. Further Reading: pump valve pipe fittings Exhibition Water Expo Xiamen exhibition of marine equipment Internet + Forum Yiwu Fair 2016 exhibition mold top ten brands of the Internet information industry (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / WeChat: 2355962924) http://beng.liuti.cn/ (Service Hotline: 400-6030-811)