control valve discussion _ linkedin
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11/10/13 control valve discussion | LinkedIn
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ahmad rokni and 2 more commented on:
control valve discussion4 hours ago
Ali Jeddi commented in the group onregarding control valves: For choosing valvecharacteristics, also you can note to naturalphenomena as like as flashing, cavitation,chocked flow or etc I think. For...11 hours ago
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control valve discussion
Veera prasad Gadde
23 years experience Instrumentation professional
Please comment on my below 4 queries.
1) What do we mean “eccentric” when we say eccentric butterfly control
valve?
2) Some standards recommend Ball valves for throttling purpose and
some standards donot recommend Ball valves for throttling purpose .
why is to so?
3) What is the difference between plug valve and Globe valve : Send me
some pictures or drawings to [email protected]
4) What is meant by “balanced” type control valve?
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Like Reply privatelyFlag as inappropriate 23 hours ago
François Chabanne
Project Manager (technical business framework)
Eccentric butterfly control valve:
Triple eccentric (offset) Design prevents galling and scratches between the metal seat and the
metal disc due to its unique design. The only time where the seal comes into contact with the
seat is at the point of complete closure. Triple offset valves are generally used in applications
which require bi-directional tight shut-off in oil and gas, LNG/NPG terminal and tanks, chemical
factories, and shipbuilding. They are also used for dirty/heavy oil to prevent extrusion.
Difference between plug valve and Globe valve:
A Plug Valve is a Globe Valve. Very generally speaking there are two major catagories of
Industrial Process Control Valves, Sliding Stem and Rotary. Globe Bodies valves fall into the
category of Sliding Stem Valves. Butterfly and Ball valves fall into the category of Rotary valves.
However there are what is referred as Rotary Plug Valves, whereby a partial sphere has a shaft
eccentrically mounted, that rotates into and out of a metal or composition seat acting as a plug.
Most plug valves are sliding stem.
Like Reply privatelyFlag as inappropriate 22 hours ago
François Chabanne
Project Manager (technical business framework)
Ball valves do not offer the fine control of other valves for throttling purposes, but they can be used
for some degree of throttling. In general, plug valves offer even less control for throttling.
SANTHIRAJ SATHANNA
Engineering,Procurement,Construction,Commissioning Professional,Project Manager,E&I
Specialist
Q4
A balanced glove valve's plug has holes. These holes facilitate equalization of process pressure on
both sides of the plug. Plug travels easily
In contrast, unbalanced valve does not have holes in the plug.The process pressure is only on one
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11/10/13 control valve discussion | LinkedIn
www.linkedin.com/groupItem?srchtype=discussedNews&trk=eml-anet_dig-b_pd-ttl-cn&gid=2630737&view=&ut=2bEvM3KOE5_RY1&item=58045427225303613… 2/2
ahmad
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Like Reply privatelyFlag as inappropriate 17 hours ago
end. So, it requires more efforts to keep the plug in place and move it
Like Reply privatelyFlag as inappropriate 4 hours ago
ahmad rokni
Instrument and Control Engineer at MAPNA
I highly recommend see hand book , i 'll send you.
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