The function of the small circulation valve in Nasim equipment
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When starting the Nasim (water ring pump), why is it necessary to open the small circulation valve? What is the purpose of this?
When starting the Nasim water ring pump for the first time, nitrogen should be used for purging first. Additionally, the valves in the small circulation loop must be opened, while the outlet valve should remain closed； When switching to a standby unit during normal operation, simply open the inlet valve and the small circulation valve; after completing all inspections, just start it up. This ensures that there is sufficient inlet gas flow until the compressor stabilizes in operation; only then should the outlet valve be gradually opened and the valves of the small circulation loop closed.
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Is that the correct way to understand it? To minimize pressure fluctuations in the system, when the Kanasim is opened, the valve position of the main recirculation valve also allows more backflow, thereby helping to distribute the pressure. What consequences will occur if the small circulation valve is not opened? Thank you
When switching units during normal operation, large-scale recirculation can occur; however, generally the outlet valve remains closed when a unit is running, so large-scale recirculation does not take place. Without opening the small recirculation valve, how can you stabilize the amount of air entering the inlet of the water ring pump? Insufficient gas extraction by the unit can cause the pump to stall.
This happens instantaneously. If the small recirculation valve isn’t opened—following the usual procedure for operating a pump, i.e., opening the inlet valve, starting the pump, and then opening the outlet valve—it seems like the pump gets congested. Could you elaborate on this? It seems that the flow rate suddenly increases. At that point, the small recirculation valve is opened; subsequently, as the opening degree of the large recirculation valve increases (resulting in more pressure division and reflux), the small valve is gradually closed until it’s completely shut. This is done to control the flow rate in the main pipe (and stabilize pressure fluctuations), preventing any sudden rise in flow rate that could otherwise cause pressure variations in the system. Just asking; this is my personal understanding. Thank you
Hello, senior. The import flow has been activated and the medium is flowing in – why is the pump still not running? ? ? With a small circulation loop, the pump isn’t subjected to backpressure anymore. How do I understand this? Please let me know, under self-circulation? ? The pressure is only about 2 kPa
What state is a pump in when it’s “choked”? Is there a problem with the outlet check valve? Or is it an outlet liquid seal or a regulating valve liquid seal?
Senior, why are we opening the small recirculation valve? ? A better cycle?