Start-up methods and suggestions for slide valve pumps in cold environments

In winter, many users said that the pump is difficult to start and has other problems. The following are the pump starting methods and suggestions.

Preparation before starting.
1) Check the belt tightness. It can be looser before starting, adjust the bolts after starting, and slowly tighten them to reduce the starting torque.
2) Check whether the parts are loose, whether the wiring is correct, and whether the motor steering is in line with the requirements of the pump.
3) Check whether the oil level in the oil tank is about half of the oil mark. Avoid the oil level being too high or too low.
4) For the pump that has not worked for a long time, check whether the rotation is flexible by hand rotation or intermittent motor tapping method before starting. Pay attention to the electric spacing time to avoid motor burnout.
5) Open the cooling water valve.
6) In winter, if the room temperature is too low, use hand rotation or intermittent motor start before starting the pump. Because of the oil viscosity at low temperature, such as a sudden start, will make the motor overload and damage the pump parts.
7) If the oil level on the oil tank is significantly different from the oil level when the pump is stopped, the pump pulley must be rotated so that the oil stored in the pump cavity can be discharged into the oil tank before starting. The pump is not allowed to start when more oil is stored in the pump cavity under vacuum at the same time.
8) Do not operate the pump when the deflation pipe is closed in order to avoid personal injury caused by excessive pressure.

Starting: Newly purchased or long-term out-of-use pumps must turn the coupling by hand for several revolutions in order to confirm whether it is stuck or damaged by transportation. Long-term disuse of the water inlet pipe or newly installed water pipe, should be disconnected from the pump, open the water inlet valve, flush the pipeline, and then connect back to the pump after cleaning well. The starting sequence is as follows.
1) Close the valve on the air inlet pipe.
2) Turn on the motor and pay attention to the pump’s steering.
3) Open the water inlet valve, adjust the water inlet and pressure to the specified requirements.
4) Slowly open the valve on the inlet pipe, at this time the pump is pumping to the system.
5) When pumps are working in the limit conditions, due to the physical action of the pump (cavitation) and a strong storm whine, a short time will not produce great damage to the pump, power consumption will not increase, but a long time in this case to operation, will produce serious damage to the pump parts, and sometimes even break the vane and shaft. Therefore, we should try to avoid long time operation in the limit condition.

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