【Discussion】Issues regarding the selection of valves for steam pipelines
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Who can talk about the selection principles for low-pressure steam valves? Why are globe valves chosen so often? What is the difference between it and ball valves or gate valves? Please share your thoughts, thank you
Ball valves are generally not chosen because when used at around 150 degrees Celsius, if the valve cannot be fully opened or closed, the seat will suffer severe damage. As for the choice between gate valves and globe valves, it depends on their function: a globe valve is used for regulation, while a gate valve is used for opening and closing
Someone upstairs feels the same! :lol
There are more plunger valves; ball valves are more expensive.
You can just take a look at the second floor; the answers there are quite complete
If the steam industry uses ball valves as shut-off valves, it will be relatively expensive. If it is used for regulation, a V-ball valve is a good choice, and it is also inexpensive. V-type control ball valves are generally available in smaller diameters; since their flow characteristics are approximately proportional, their regulation accuracy is on par with that of single-seat valves. Moreover, their service life and performance far exceed those of straight-stroke control valves. The reason why globe valves are widely used in the steam industry is their low cost. If you are using electric or pneumatic control types as well as on/off types, I personally feel that globe valves are not as good as stop valves. Due to the structure of this type of valve, its failure rate is very high; it will start leaking internally after a short time, and it won’t be possible to shut it off completely. As a result, when choosing valves with this structure, customers generally opt for manual valves as an alternative to electric or pneumatic on/off valves and control valves, in terms of cost. As mentioned above, using a plunger valve is actually a good option as well. If it’s a manual valve, the plunger valve will be more expensive than a globe valve. The specific type of valve to use should be determined based on the company’s actual circumstances; it’s advisable to communicate more with the people from valve manufacturers. QQ: 928976489 (Your control valve consultant). 13764138563 – MR GUO
Our pipeline pressure is very low, only 2 to 6 Bar g, and the temperature is in the high 130s degrees; we generally use ball valves
The temperature of the medium in steam pipes is generally relatively high, usually above 150 degrees. Under such operating conditions, globe valves can perform very well； As the diameter increases, the price of ball valves tends to rise accordingly. Ball valves typically use soft seals, which are surface-based seals; the seat seal is usually made of PTFE, and their temperature resistance is generally below 150 degrees. In steam pipelines, whether it’s a shut-off valve or a control valve, I recommend using globe valves whenever possible. This is experience from practical applications QQ:120519927
Globe valves are generally used for steam pipelines! Gate valves do not provide effective flow restriction, making it difficult to start and stop the flow of steam for pipe warming; on the other hand, globe valves have a certain check function that provides some protection for the equipment and pipelines.