Hello everyone, a newcomer seeking help
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Hello everyone. I’m a newcomer, and my questions are quite basic; I hope you can understand me and offer some help. Reciprocating compressors have loaders that can be operated with gas present, either for loading or unloading. Unloading with gas is easy to understand – it involves pushing the intake valve open to allow gas to flow back. However, all of our 4 compressors are loaded while there is gas present. What is the principle behind loading with gas, and how can the valves function properly in such conditions? In our workshop, there is a shielded pump made by Dalian Haimi; the fluid used is desalinated water. There is also an auxiliary metering pump, and the fluid delivered by this pump is also desalinated water. The pipeline connected to the metering pump leads to the cooler attached to the shielded pump, where it is cooled by circulating water. This pipeline also leads inside the shielded pump itself. From what I’ve found online, shielded pumps are equipped with auxiliary impellers that serve to lubricate the components and cool the motor – so why is a metering pump needed as well?
It’s very simple: when there is wind, the wind force acts to open the valve flap; when there is no wind, the spring force does the same. A shielded pump combined with a metering pump is generally used when the pressure of the pump is very high, and sometimes in pumps that operate at high temperatures.
Thank you, my best friend. I understand the concept of the pressure valve now, but I still have a question regarding the shielded pump. Our medium is at around 43°C and the pressure is about 4.8 Mpa – does this fall under the situation you mentioned?
Expert, I have a question: Is what the original poster said about loading under pressure and unloading under pressure correct? Isn’t the air valve designed to release pressure when there is air, and to apply pressure when there is no air? Can a gas valve still be in a state of loading and unloading while there is gas present?» Seek an answer
I’ve looked up information online about canned motor pumps, and they all have auxiliary impellers that serve to lubricate the motor and cool it. There are also models designed for use at high temperatures; I don’t think there are any other types
The cooling of the shielded pump motor is achieved by circulating cooling water through the water jacket surrounding the motor. Although internal circulation can cool the motor, external cooling is required when the temperature of the medium is high. A metering pump is used for pressurization and metering.