Must the valve for the vent pipe be a gate valve?

A stop valve will work as well; it’s no problem. However, it should be noted that the pipeline must be empty of solids at the time of draining; otherwise, the stop valve may not close properly.

Gate valves or plug valves are generally used. Never use it if the stop valve does not close properly.

Globe valves cannot regulate flow, whereas globe valves can be used for shutting off or opening flow. Globe valves are primarily used for cutting off flow. . . . . .

Globe valves, also known as gate valves, are a type of valve that is widely used. Its principle of closure relies on the highly smooth and even surfaces of the gate seal face and the valve seat seal face, which fit together to prevent the flow of the medium; the sealing effect is enhanced by the use of a top mold, springs, or the shape of the gate itself. It mainly serves to cut off flow in the pipeline. Its advantages are: low fluid resistance, easy operation for opening and closing, the ability to be used when the medium flows in both directions without any directionality issues, the sealing surface is not prone to erosion when fully open, and it has a short structural length; therefore it is suitable not only for small valves but also for large valves. Compared to gate valves, globe valves have a simpler structure, are easier to manufacture and maintain, and offer good regulating performance; they are widely used in pipelines for transporting various types of media. However, as the fluid changes direction when passing through the stop valve, the resistance is high; therefore it is not suitable for use in pipelines containing materials with high viscosity, suspended particles, or those that tend to crystallize. It is also not appropriate as a vent valve or a valve for low-vacuum systems. Stop valves are widely used in various pipelines for pressurized fluids, and they are also commonly employed in steam and compressed air pipelines. A stop valve is a commonly used shut-off valve, primarily used to connect or disconnect the fluid in a pipeline, and it is generally not used for regulating flow. Gate valves can operate over a wide range of pressures and temperatures, but they are generally used in pipes with medium and small diameters. A valve in which the closing element (valve disc) moves along the center line of the valve seat, and the change in the opening of the valve seat is directly proportional to the travel distance of the valve disc.

With a gate valve, I feel it mainly gets clogged, but it’s easy to clean :)

Gate valves have low resistance, allowing for timely drainage. It is also easy to clean

For higher pressure levels, gate valves are used; in most cases, globe valves are sufficient.

Gate valves have low resistance, allow for timely drainage, and are not prone to being blocked by solid particles carried during drainage, which could prevent the valve from closing properly. For the drain valve, I think a plug valve is better – it’s easy to operate, not prone to clogging, and it’s simple to clean if it does get clogged.

Generally, I use ball valves more often. Gate valves are used for larger diameters, while globe valves are used for higher pressures.

Most use globe valves and gate valves; we use globe valves a bit more often

Generally, gate valves are chosen for applications that require constant operation, while globe valves are used for regulating flow

The type of valve to be used for venting depends on the diameter of the pipeline, the medium flowing through it, and the available space at the site. If the diameter is small and the pressure is high, globe valves or gate valves are used; if the diameter is larger and the pressure isn’t too high, disc valves can be employed. At China National Coal Group, I used a 40-kilogram three-eccentric disc valve for venting – the diameter wasn’t large, but a disc valve was chosen due to the limited space available at the site

Gate valves have low resistance and are not prone to clogging, while globe valves have high resistance and sometimes cannot be closed tightly

We use ball valves quite often; especially for larger pipe diameters, ball valves are easy to operate.