When the flow rate at the pump outlet is low, reduce the flow by closing the pump outlet valve and expand the adjustment range of the control valve
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When the flow rate at the pump outlet is low, measures such as increasing the pre-heating temperature of the standby pump, reducing the throttling effect of the pump outlet valve, and expanding the adjustment range of the control valve are taken. Is there a risk of reduced sealing performance due to cavitation at the outlet valve? The medium is condensate water.
It can be found by checking the pump outlet pressure and the water vaporization curve.
I recommend a must-read reference book in this field: \"Principles of Chemical Engineering.\" The college version is sufficient, so it’s worth giving it a try. Let me organize the questions you raised; perhaps including a schematic diagram would make it clearer, so it’s easier to understand right now. The types of pumps are quite diverse; centrifugal pumps can be controlled using discharge valves, whereas positive displacement pumps cannot be controlled in this manner. There’s also terminology like “amplifying control valves” and “cavitation sealing”. It would be best to include a diagram with annotations of the relevant conditions, to facilitate discussion and serve as a reference.
Over time, the outlet valve will start to leak internally, and the pump won’t be able to shut off properly. I think it’s possible to limit this by using a manual valve in front of the control valve, haha
Condensate pumps generally have a minimum flow line; if this is not activated, it should be able to resolve this issue. :L