The function of a liquid seal
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While working on the piping, I noticed that each ball valve was equipped with a pipe section over 500 MM in height, used as a liquid seal. I would like to ask the experts here: what is the principle and function of this? Thank you!
There is a gas-liquid two-phase flow to prevent vaporization. :L
Whether in front of or behind the valve, what 3# said makes some sense – it’s probably to prevent vaporization or something similar. I don’t agree with what 2# said; are valves really at risk of getting soaked?
I’m not quite sure what a liquid seal is like – is the valve located at a higher position or a lower one? ? The original poster didn’t explain it very clearly. Ball valves generally have a fast switching speed. In locations where vaporization can occur, or when there is a risk of backflow and emptying, a liquid seal is used – this is to prevent the fluid in the pipeline from exerting strong forces on the valve and other pipe fittings when the valve is opened or closed, as this can easily damage the equipment and tear apart the gaskets. Adding a liquid seal serves a protective purpose. But ordinary pipes don’t have such a design either. Not every one will be like this; only the valves in special locations have them. As LZ said, it’s available for each valve; it’s best to confirm what manufacturing process is used.
I’m just worried about vaporization; that’s what I did. At first I didn’t set it up, and they told me to do it in the shed. Also, a liquid seal needs to be installed when the liquid from the condenser enters the tower. When I first started working, I didn’t know anything about this, but now I do. Another thing is the drain liquid; beginners should pay more attention to this!
Could the poster add a simple schematic diagram? This is beneficial for experts to analyze, as well as for beginners to learn how to use it! For example, as the original poster mentioned, a 500MM pipe was added – is it a vertical dead end pipe or something else? Beginners don’t understand that.