Valve diameter and pipe diameter
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For the valves on pipelines, the valve diameter is generally slightly smaller than the pipe diameter. Is there any standard specifying by how much? Besides being used for regulation, what other reasons are there for this?
:o I’ve never heard of this; it seems that this phenomenon only occurs with control valves, and it depends on calculations based on the process requirements, with flow rate being a key factor
Generally, the valve diameter of a valve is the same as the pipe diameter. Control valves usually have a different diameter from that of the pipes, as their selection requires calculation based on the process conditions; in particular, the Cv value must meet the process requirements. As a result, the control valve chosen is generally slightly smaller in diameter than the pipe. (Usually grades 1–3)
Ordinary valves are the same as those used in pipes; only some used for control may differ
Agree with what was said above: victory:
Ball valves come in straight-bore and reduced-bore types, but it seems other valves do not have this feature
Butterfly valves also come in reduced-diameter versions; generally, the degree of reduction should be determined based on the Kv value at different angles. However, the reduced diameter must not be less than half of the pipe diameter – this is something that requires special attention!~
Generally, only control valves are subject to such requirements; the diameters of the other valves are basically the same as those of the pipes.
In my opinion: unless there is a specific requirement that the flow area of most valves be smaller than that of the pipeline, I believe it is related to saving on material costs
For the valve diameter, it’s sufficient to use the same diameter as that of the pipe; there’s no need to worry too much about it!!!