4, self-priming centrifugal pump with a high speed, small size, light weight, high efficiency, large flow, simple structure, no pulse infusion, steady performance, easy operation and convenient maintenance. Therefore, the following exceptions should be used wherever possible self-priming centrifugal pump: a metering requirements, the selection of a high lift pump metering requirements, 250ZX450-55 pump, flow is very small and there is no proper small flow of high-lift self-priming centrifugal pump the selection, the choice of reciprocating pumps, can also be used as pump cavitation vortex less demanding. ZX self-priming pump working principle and structure shows that with this process again and again to proceed, pump, suction line air declining until exhaust gas, complete self-absorption process, the pump will be put into normal operation. In some of the bottom of the pump bearing is not cooling chamber. When the bearing caused by heat bearing temperature rose more than 70 ℃, in the cooling chamber through any one of the coolant pipe fittings, into the coolant circulation cooling. _ 250ZX450-55 priming pump mechanical seal (Online) _ provided by the Shijiazhuang-priming pump Pump Co., Ltd. faction. Shijiazhuang-school Pump Co., Ltd. (www.shipaipump.com) in this area other devoted boundless enthusiasm and passion, Shijiazhuang-pump has been sent to the customer-centric, for customers to create the concept of value, quality, service to win the market, and sincerely hope to cooperate with the community to create success, to create brilliant. Related businesses welcomed the inquiry, Contact: Manager Xu.