Selection of root valve?
Thread Content
There is an opening on the main natural gas pipeline; local pressure needs to be measured, as well as remote monitoring. What type of valve is suitable for use as the root valve?
It is generally a stop valve. . . . .
Needle valve – a type of globe valve! It has threads and joints on both ends! Screw ball valves can also be used! Both of the above are good choices!
Is it required that the material be stainless steel? It would be best to upload a picture for a look. . .
Given the need for long-distance transmission, and if it is not used frequently, it is recommended to choose a ball valve, as it has low resistance and good sealing performance.
If the pipe diameter is relatively large, it is better to choose pneumatic or electric ball valves
Generally, the opening size does not exceed DN25.
Stop valves or ball valves; other types are not acceptable
Generally, globe valves and stop valves are chosen; this depends on factors such as pressure, medium, and temperature. Globe valves are preferred when clogging is a concern, while stop valves are better suited for higher pressures!
Root valves are mainly used for opening, not for regulation; gate valves or ball valves are generally chosen (depending on the pipe diameter).
Currently, a special type of pressure gauge stop valve is commonly used on gas pipelines; it offers good sealing properties and ease of use. There is also a version with a venting function – when the main valve needs to be closed and the pressure gauge removed, air can be released to lower the pressure, thereby ensuring safety. Although the root valve of a pressure gauge is small and not expensive, it cannot be taken lightly. Choosing it carelessly can lead to many problems, and may even result in production shutdowns for repairs. It’s still best to choose a good one with reliable quality; stainless steel is ideal.
Root valves can only be opened or closed; gate valves are a better choice as they have a simple structure, are not prone to damage, and are relatively inexpensive.
Regarding the pressure gauge mentioned on floor 13, can you send a picture of it along with the stop valve?
Ball valves are great – they offer good sealing and can be opened and closed quickly!
If there is a risk of materials blocking the pressure pipe, it is best to choose a gate valve or ball valve. The material can be selected based on the composition of the substance; generally, the same material as that used for the pipelines carrying the substance is chosen, or a material of a higher grade. It is essential to remember to select the material according to its corrosion resistance properties.
I recently worked on a project for China National Petroleum Corporation, where the design requirement for the root valve was a globe valve. For pressure tapping lines that are operated frequently, it is recommended to use DBB valves (double-block and bleed valves): these valves feature two stages of shutdown as well as a bleed function, which helps to extend their service life
It can also be equipped with a relief valve and a plug
Also, check whether it contains hydrogen sulfide; otherwise, an anti-sulfur variant should be chosen.
I think the first thing to consider is what purpose the flow rate he needs it for serves; after determining the type of valve to use, a needle valve should be chosen for the pressure gauge, while globe valves are used for other purposes. The material depends on the medium being handled.