Internal leakage of the valve
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Why do some valves leak internally and cause heating behind them, while others, when they leak, produce a large amount of water that is very cold!
I have never encountered a situation where there is internal leakage in the valve and heating occurs downstream of the valve; however, I have seen cases where water is present downstream of the valve and the temperature there is very low. In such cases, the medium flowing through the valve must be gas. When there is internal leakage with gas as the medium, the gas expands and absorbs heat, which results in a decrease in temperature downstream of the valve. This drop in temperature causes the water vapor in the surrounding air to condense into liquid water
1. Medium: Compressed carbon dioxide gas; internal leakage in the valve results in a decrease in temperature downstream of the valve. There is condensed water on the outer wall of the valve body, as the expansion of gas absorbs heat, causing the water in the air to condense and precipitate. 2. Medium: Medium-pressure steam; internal leakage in the valve, resulting in an increase in temperature downstream of the valve. The reason is a leak; the heat conducted by the leaking steam raises the temperature of the flange and pipes downstream of the valve.