Drilling Equipment Key Features ●Compared with the centrifugal pump, screw pump does not need to install the valve, the flow is stable linear flow. ●Compared with the pneumatic diaphragm pump, screw pump can transport a variety of mixed impurities containing gas/ solid particles/ fibers of the media, as well as a variety of corrosive substances. ●Compared with the gear pump, screw pump can transport high viscosity material. ●Compared with the plunger pump, diaphragm pump and gear pump, screw pump can be used for chemical filling and metering.