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Class Information
Number: 137/246.19
Name: Fluid handling > With cleaner, lubrication added to fluid or liquid sealing at valve interface > Liquid supplied at valve interface > Screw feed > Jacking
Description: Valves wherein the lubrication pressure lifts the valve from its seat.

Patents under this class:

Patent Number Title Of Patent Date Issued
4619283 Stem seal for tapered lubricated plug valves Oct. 28, 1986

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