Function of installing a breather valve in the heat exchanger return pipeline
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I saw a heat exchanger design in which safety valves and breather valves were installed on the heat exchanger’s circulation water pipeline. I don’t understand what the function of the breathing valve is. It is said that this heat exchanger is installed at a relatively high position, on the third floor or above; according to the data sheet, the operating condition for this valve is water hammer. The main operating condition is suction; is it possible for a vacuum to be created? Has anyone encountered a similar situation?
When the water cooler is located at a high position, it is common for the siphonic effect of the circulating water flowing downward to create negative pressure at the higher sections of the return water line.
Could you explain it in more detail? Is it still clear how negative pressure is generated – is it because the pressure in the water inlet pipe is not sufficient, preventing water from flowing in?
Same question: Could the senior on the first floor please provide a detailed explanation of why negative pressure is created? Furthermore, could this negative pressure cause an increase in the flow rate of the coolant (such as circulating water) within the heat exchanger?
Results of pipe network analysis, but those with orifice plates are more common