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Because of its variable pump delivery, self-priming ability, reversible, capable of conveying liquids containing solid particles and other characteristics of the sewage treatment plant, is widely used in the transport of water, sludge and flocculant liquid chemical . Screw pump selection should follow the economic, reasonable and reliable principles. If the design selection of ill-considered, will give future use, management, maintenance trouble, so choose a production according to actual needs, reasonable and reliable screw pump can ensure the smooth production, but also reduce repair costs. Screw pump speed selection Screw pump flow and speed into a linear relationship, relative to the low-speed screw pump, high-speed screw pump to increase the flow and lift, but significantly increased power, high speed accelerated between the rotor and stator Of the wear and tear, will inevitably lead to failure of the screw pump, screw rotor and high-speed fixed rotor length is very short, easy to wear and tear, thus shortening the service life of the screw pump. Through the speed reducer or stepless speed regulating mechanism to reduce the speed, the speed maintained at a reasonable range of three hundred revolutions per minute, and high-speed operation of the screw pump, the service life can be extended several times. The quality of the screw pump Screw pumps on the market now more types, relatively speaking, the imported screw pump design, excellent material, but the higher prices, some services are not in place, high parts prices, long ordering period may Affect the normal operation of production. Most of the domestic production of imported products imitation, product quality varies greatly in the choice of domestically produced products, considering its cost-effective time, the choice of low speed, long lead, transmission parts of good quality, long life rating of the product. To ensure that debris does not enter the pump Wet sludge mixed with solid impurities will screw the rubber material stator damage, so to ensure that debris does not enter the cavity of the pump is very important, many sewage treatment plant before the installation The grinder, and some install grille device or filter, block debris into the screw pump, grill should be promptly salvaged to avoid clogging. Avoid broken screw pump Never allow the case of broken material operation, once occurred, the rubber stator due to dry friction, instantaneous heat generated and burned, so the grinder intact grille is a necessary condition for the normal operation of the screw pump First, for this reason, some screw pumps are still installed in the pump body off material shutdown device, when there is a broken material, due to the self-priming screw pump has the characteristics of the cavity will produce a vacuum, the vacuum device will make the screw pump stop running. Maintain a constant outlet pressure Screw pump is a positive displacement rotary pump, when the outlet is blocked, the pressure will gradually increase, so that the pressure exceeds the predetermined value. At this time the motor load increased dramatically. Transmission machinery related parts load will exceed the design value, severe motor burn occurs, the transmission parts broken. In order to avoid damage to the screw pump, generally installed at the outlet of the screw pump bypass relief valve to stabilize the outlet pressure to maintain the normal operation of the pump.