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First, the start of the screw pump Screw pump suction stop valve should be fully open in case of starting to prevent overload or suction air. Although the pump has dry suction capacity, but must prevent dry rotation, so as not to scratch the work surface. If the pump needs to be started with very low oil temperature or high viscosity, it should be started with the suction valve and by-pass valve fully open to minimize the load when starting the pump. Until the prime mover reaches the rated speed, Bypass valve gradually closed. When the by-pass valve is opened, the liquid is circulated and circulated in the pump under the condition of throttling, and the more the circulating oil is, the longer the circulating time is, the more severe the heat of the liquid is, and even the pump factor High temperature deformation and damage, we must pay attention. Second, the operation of the screw pump Screw pump must be in accordance with the established direction of operation to produce a certain suction row. Pump work, should pay attention to check the pressure, temperature and mechanical seal work. Shaft seal should allow a trace of leakage, such as leakage does not exceed 20-30 seconds / drop, then that normal. If the pump is noisy at work, it is often caused by too low an oil temperature, too high a viscosity of the fluid, air entering the fluid, loss of coupling, or excessive wear on the pump. Third, the screw pump stop screw pump parking, you should close the discharge valve to stop, and to be stopped after the pump stopped inhalation stop valve. Screw pump due to the larger working screw length, poor rigidity, easily lead to bending, resulting in abnormal work. Shaft connection must be well centered; the best work is to be carried out after the installation of positioning, so as not to cause deformation of the pipeline implicated; connection pipe should be independently fixed, as far as possible to reduce the implication of the pump. In addition, the spare screw, it is best to save the suspension method used to avoid uneven placement caused by the deformation.
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