Regarding the diameter change of control valves
Thread Content
When the size of the control valve does not match that of the connected process pipe, reducers are generally used for connection. Please discuss whether it is better to use concentric reducers or eccentric reducers
I think an eccentric large and small end should be chosen. Substances with a density greater than that of air tend to accumulate at the bottom of the inlet, so an eccentric elbow with a flat bottom is chosen; conversely, an eccentric elbow with a flat top is selected.
I think it should be the same as the considerations for regular pipeline diameter changes! It is chosen based on the medium flowing through the pipeline, as well as the route of the pipe. Pipelines are sensitive to liquid accumulation or the presence of particles, so a bottom flat design is used; for gas pipelines, a top flat design is generally employed.
For the diameter change of control valves, a concentric design is generally chosen, right?
In fact, both concentric and eccentric designs have their own advantages and disadvantages. By using concentric reducers, the flow condition of the control valve improves, and the control accuracy becomes more precise. The use of eccentric tees prevents fluid accumulation in the pipes at both ends of the control valve. In design, concentric reducers of different sizes are commonly used, but the reason for such a design has not been explained.
For the diameter change of control valves, a concentric design is generally chosen, right?
There are both concentric and eccentric cases, and different engineers have different considerations. But concentric is the simplest; there’s no need to consider whether the top or bottom should be level, as is the case with eccentric designs.
It seems that most of the common ones are concentric.
Any size of fitting can be used for gases; eccentric reducers can be employed in cases where liquid pockets may form
It mainly depends on the fluid flowing through the pipeline and the specific requirements; for example, in industries with high hygiene standards, different types of eccentric tees must be used as appropriate, with flat bottoms being the common choice； For pipelines that do not have hygiene requirements, concentric reducers can be used, resulting in a relatively stable flow of the fluid within the pipeline.