Thermostatic valve pressure drop
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I would like to ask fellow sailors: the pressure at the inlet of the drain valve is 9 kilograms, while the pressure at the outlet is 4 kilograms, as calculated based on the pressure difference in the system downstream of the valve and the pipeline resistance. So what causes the 5-kilogram pressure difference across the drain valve? Is it due to the internal structure of the valve or some other factor? Please advise
The pressure at the inlet of the condensate is caused by the steam pressure; after it exits, this pressure cannot be maintained at 9 kilograms – it drops to only 4 kilograms. After exiting, the pressure is determined by the back pressure, and it has little to do with the internal structure of the drain valve. That’s what I think
Well, thank you. Then what causes the pressure difference generated by the check valve? Could you please explain?
The vapor condensation pressure will definitely decrease. Just think about it: if you put a bottle of liquid in a sealed container and then open it after some time, it will be easier to see the contents. Pressure is caused by molecular collisions; now, with so many water molecules colliding together, they turn into a liquid, and therefore the pressure must decrease
Well, thank you. Isn’t the temperature and pressure of the condensate formed after saturated steam condenses the same as those of the saturated steam? It’s the latent heat of that steam that is used, so I don’t understand how the pressure can decrease. Please advise
It’s like this before the steam trap: the pressure can be 9 kilograms. But after the valve, for example, in the case of direct discharge, the atmospheric pressure is only 1 kilogram. Do you think the condensate water can still maintain a pressure of 9 kilograms? Of course not; it will quickly flash down to 1 kilogram
Pressure is determined by the pressure in the system before the valve and the pressure in the system after the valve! ! ! ! ! ! ! ! ! ! ! !
Hello, have you figured out why the condensate creates a 5-kilogram pressure drop across the steam trap? Thank you
Everything in the past was a liquid; if its volume decreases, can pressure not drop?
The steam trap also serves as a pressure division point in the steam system; it is often the part of the system where the greatest pressure drop occurs. The pressure before the steam trap can generally be considered to be the inlet steam pressure, while the pressure after the steam trap is typically the pressure in the condensate system (also known as backpressure). Incorrect selection of steam traps can sometimes result in the traps not opening and closing properly, and it can also lead to problems related to their lifespan and leakage rate.