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Gear pump selection principles: 1, the selected pump type and performance in line with the device flow, head, pressure, temperature, cavitation flow, suction stroke and other process parameters. 2, must meet the characteristics of the media requirements. Pumps that deliver flammable, explosive toxic or valuable media require dependable shaft seals or leak-free pumps such as magnetically driven pumps, diaphragm pumps, shielded pumps. Pumps that deliver corrosive media require convective components to be corrosion resistant, such as Verderair Pneumatic Diaphragm Pumps and Verdermag Magnetic Drive Pumps. Pumps containing solid particulate media, or media containing more solid particles, are required to have a wear-resistant material for the convection components and flush with the cleaning fluid if necessary. 3, high mechanical reliability, low noise, small vibration. 4, the economic should take into account the equipment costs, operating costs, maintenance costs and management fees the lowest total cost. 5, centrifugal pump with high speed, small size, light weight, high efficiency, large flow, simple structure, infusion without pulsation, stable performance, easy operation and maintenance features such as convenience. Therefore, in addition to the following circumstances, the centrifugal pump should be used as far as possible: a, there are metering requirements, the selection of metering pumps, peristaltic pumps, hoses b, high lift requirements, flow is small and not suitable for small flow high lift centrifugal pump Optional, the choice of reciprocating pump, plunger pump, such as cavitation less demanding can also use the vortex pump, vane pump c, low lift, flow is large, the choice of axial flow pump and mixed flow pump. d, medium viscosity (greater than 650 ~ 1000mm2 / s), consider the choice of rotor pump or reciprocating pump (gear pump, screw pump) e, gear pump medium gas content of 75%, the flow is smaller and the viscosity is less than 37.4mm2 / s, the optional vortex pump. f, on the occasion of frequent or inconvenient irrigation pump should be used with self-priming pumps, such as hose pumps, self-priming vortex pumps, pneumatic diaphragm pumps
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