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Inverted Taper Pressure Balanced Lubricated

Inverted Taper Pressure Balanced Lubricated

Inverted Taper Pressure Balanced Lubricated

(OP)
what does Inverted Taper Pressure Balanced Lubricated valve mean

always i see this on a plug valve spec.

best regards

RE: Inverted Taper Pressure Balanced Lubricated

Normally a plug valve has a top-entry and the plug is tapered wider at the top. An inverted plug valve is inserted from the bottom, so there is a bottom flange AND a shaft seal.  This can be made to balance the axial forces on the plug so it is not displaced by the process pressure.  I assume you know the lubricated part, but in a lubricated plug valve a >SEALANT< is hydraulically injected to float the plug free of the body so it can turn.  I highlighted "sealant" because it is more than a lubricant: it is specially formulated so that it neither is soluble nor reactive with whatever the process fluid is.

Maybe this link will work.  If not, go to FLowserve.com, valves, and Nordstrom.

http://fcd.flowserve.com/valves/products/valve.jsp?pageid=NVA0009

Lubricated plug valves are used in refining, water and waste,  and mining applications.  

There are also NONlubricated plug valves.  These have a tapered plug that nests into a (usually) tfe sleeve/liner in the body.  These tend to be more useful in chemical applications.  These are also in the Flowserve.com website under "Durco".

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