What are water seals and liquid seals? What are their functions?

A water seal uses a certain height of water to contain the gas, as gases are insoluble in water. If the gas can dissolve in water, another liquid is used; this is then called liquid sealing.

A water seal is a separation method that uses water to isolate the two gases that need to be separated from each other. The most common example of this approach is household toilets, followed by industrial ventilation and isolation systems. :)

A water seal is a separation method that uses water to isolate the two gases that need to be separated from each other. The most common example of this approach is household toilets. Another example is industrial ventilation isolation systems, such as the zipper-type water seal devices located beneath sintering machines; our factory still uses such devices. However, the biggest drawback of these water seals is that the air stream contains water vapor, which makes it difficult to use electrostatic precipitators (as it can cause corrosion to the precipitators). The height of the water remaining in the toilet after each flush acts as a bend, preventing odors from escaping; it is a form of water seal. A liquid seal is used to prevent the liquid contained within from reacting with external gases such as air, which could cause the liquid to deteriorate, or to prevent external gases from dissolving into the liquid and contaminating it. It does this by using a liquid that does not react with the contained liquid, is immiscible with it, and has a lower density than the liquid itself, thereby separating the liquid from the external environment. The conditions for using a liquid seal are as follows: 1. The two liquids must have different densities; 2. They must not be miscible with each other (for example, alcohol and water have different densities but are miscible, so they cannot be used for liquid sealing). When placed in the same container, they should form distinct layers. Examples of such combinations include CCl4 and H2O, or gasoline and water – in these cases, a clear layering occurs quite quickly. The main purpose of using a liquid seal is to prevent the liquid from coming into contact with air and to stop it from evaporating. For instance, liquid bromine requires a liquid seal because it evaporates easily. By placing a layer of water on top of it, its evaporation can be prevented, thus avoiding contamination of the air ； There is one type, and then there’s another type such as those like K that burn violently upon contact with air; in these cases, kerosene is used as a sealant, and because kerosene has a higher density than the other substance, it sinks to the bottom and thus does not come into contact with air. In short, it is necessary to avoid contact between the reagent and air.

The two students above have already explained what a water seal is; I will now add some information regarding its functions: 1. Preventing backflow of gases: such as the water seals in gas generation and cleaning towers, as well as those at the inlet of gas holders； 2. Explosion-proof pressure relief water seals, such as those used in desulfurization cleaning towers. Are there any other additions from everyone?

I think there is no difference in the function of a water seal and a liquid seal; the only difference lies in whether water or some other liquid is used. 1. The gas passes through the water seal tank to separate the liquid from the gas. 2. It ensures a certain liquid level inside the storage tank.

A water seal uses water to separate two gases, while a liquid seal uses a liquid (which can be water or some other liquid) to separate the liquid contained within from air, preventing it from coming into contact with air and thus avoiding oxidation and deterioration.

In some cases, water seals and liquid seals can be simply regarded as check valves. Is it possible to understand it this way?

The water seal functions essentially as a vent valve; when draining flammable gases, it is placed in the water seal to prevent the gases from escaping. It is important to ensure that the water seal has an overflow mechanism

A water seal is a sealing device in pipeline structures that is made using the principle of a communicating vessel. It is widely used in industrial machinery, control systems, processes, and everyday life. Its main function is to separate two portions of gas. The types of sealing fluids include water, seawater, sulfuric acid, and so on. A liquid seal refers to a seal created using a liquid. General liquid seals are suitable for situations where the pressure difference between the inside and outside of the area to be sealed is not very large, as well as in places where high sealing standards are required or where it is not convenient to install valves. The medium used for liquid sealing is generally required not to react with the gas being sealed; water or oil is commonly used.

The water seal helps maintain the pressure inside the equipment container; when the pressure becomes too high, the water seal breaks to protect the equipment

A water seal is used to prevent the leakage of useful gases

A water seal and a liquid seal work on the same principle; the only difference is the medium used, and they are simply simple safety devices for isolation.