Selection of bypass valve
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Which types of bypass valves are generally used? What are their characteristics and what working conditions are they suitable for? Please discuss them.
The stop valve uses its function to regulate flow when the regulating valve is damaged and repaired.
I agree with the answer above. Generally, a stop valve is used for bypass, and ball valves are also used instead, but the effect is not as good as a stop valve. :handshake
The bypass valves of the self-regulating valves in our factory all use gate valves (for liquid media), but the compressed air uses plunger valves.
Generally, a stop valve is used for bypass, and a ball valve is also used instead, but the effect is not as good as a stop valve.
In the past, the bypass valve of our most important pressure regulating valve used a ball valve, mainly because the material viscosity was high and a stop valve could not be used. Of course, for low-viscosity fluids such as water, it is better to use a stop valve to regulate the flow. Now this kind of regulating valve has been replaced by the frequency conversion method of the delivery pump.
Throttle stop valves can be used for pipelines with higher pressure, and ball valves and regulating valves can also be used for pipelines with lower pressure.
It should be possible to use a stop valve or a ball valve for bypass. The specific selection must be combined with the characteristics of the process conditions and should not be generalized.
I have seen that most bypass valves use stop valves!
The stop valve is easy to adjust the flow rate finely, has good sealing performance, and is easy to open and close. Ball valves are rarely used as bypass valves. Especially high-temperature pipes such as steam and water drainage cannot be used, and it is inconvenient to use ball valves to open and close when the diameter is large.
In steam pipelines and large-diameter water supply pipelines, gate valves are used because fluid resistance is generally required to be small.
Generally, stop valves are used more often, but it mainly depends on your usage environment. Stop valves are more adaptable. Butterfly valves, gate valves, and ball valves are all used.
Which valve to choose depends on your media conditions, temperature, pressure, viscosity, etc. Each valve has its own characteristics. There is no best valve.
There is an introduction on it, but I can’t find the book.
If the adjustment function is not critical, it should be possible to use a gate valve.
Selection of steam valves: Shut-off valve DN100~250, bypass valve DN20~25; shut-off valve DN300~600, bypass valve DN25~50;
The selection of the bypass valve of the regulating valve is based on meeting the corresponding process requirements. As long as it can meet the process production requirements and can be regulated when needed, the most commonly produced ones are stop valves, ball valves for oxygen systems, butterfly valves for low-pressure systems, and angle valves that require more precise adjustment amounts!