Operation issues and key points for high-speed pumps

I think large fluctuations in the outlet pressure of high-speed pumps are usually caused by pumping out gas! When operating, it is important to open the outlet valve slowly and monitor the fluctuations in outlet pressure. The working principle of a high-speed pump is gear speed increase

The reason for excessive pressure fluctuations at the outlet of a high-speed pump is too low flow rate. Precautions for operating a high-speed pump: 1. The high-speed pump must not be operated without liquid under any circumstances, to prevent damage to its components.  2 It is not allowed to start the high-speed pump with the discharge valve closed for shut-off operation.  .3 The flow rate must be regulated using a discharge valve; it is absolutely not permissible to use a suction valve for this purpose. A high-speed pump is essentially a centrifugal pump, with its rotation speed increased by adding an accelerator. High-speed centrifugal pumps are single-suction, single-stage or two-stage horizontal high-speed pumps. They consist mainly of the pump unit, a speed increase mechanism, lubrication and monitoring systems, a base, and a motor. Thanks to the use of variable-pitch inducer wheels and composite impeller technology, these pumps offer stable performance at low flow rates, excellent cavitation resistance, and high efficiency. Additionally, they feature a compact structure, ease of maintenance, wide applicability, good reliability, and a long service life, making them the trend in the development of centrifugal pumps in the future. Multi-stage self-priming centrifugal pumps or reciprocating plunger pumps with the same parameters, on the other hand, have disadvantages such as complex structure, difficult maintenance, many vulnerable components, and poor reliability; therefore, they are being replaced by high-performance high-speed centrifugal pumps. Rotational speed n=4500~19000rpm