manual throttling of plug valve
manual throttling of plug valve
(OP)
Hello,
I would like to ask if it is possible to use plug valve in manual throttling service and keep it partially close for a long times like 2 or 3 months in gas service ??
if not, what is the suitable type of valves can do that
thank you in advance
I would like to ask if it is possible to use plug valve in manual throttling service and keep it partially close for a long times like 2 or 3 months in gas service ??
if not, what is the suitable type of valves can do that
thank you in advance





RE: manual throttling of plug valve
Given that unless the inlet and outlet conditions stay exactly the same (pressure, temperature, composition) the pressure drop or flow rate will also vary even if the valve is not damaged. This is why control valves exist....
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RE: manual throttling of plug valve
If there are any solids or liquids, it might still last a long time, but it might not- it depends on how closed you're operating it, how much solid or liquid is present, and the nature of that solid or liquid content, and of course on the materials of construction of the valve trim and body.
The gas itself will not erode the valve parts.
Plug and ball valves without seat or hole characterization are rather difficult to use as throttling valves. They are very, very sensitive to the rotational position when nearly closed, and quite insensitive when nearly open. When using these valves for manual rather than automatic throttling, we generally put a gear operator on them, since trying to make adjustments with a handle alone is too frustrating to tolerate.
RE: manual throttling of plug valve
Proper throttle valves like a globe valve, variable choke, or V-Ball will tend to be a lot closer to linear where I'm getting 8% of flow at 5% open and 12% at 10% open and 20% at 20% open etc. Much easier to program control.
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: manual throttling of plug valve
If you have sand in the gas in high dp application, then you will most likely have to replace this plug valve with a heavy duty choke valve.