Flowserve Serck Audco Twin Isolation Plug Valve - Manual (Page 15)

7.3.2.3 ADJUSTING OUT OF THE TAPERED SEATS
To adjust a seized or hard to turn plug out of the body taper, slacken off the plug loading screw by 1/4
turn, then inject sealant into the valve, and this should ease the plug out sufficiently to make it operate
smoothly.
CAUTION: Do not remove the plug loading screw from the valve cover.
7.3.2.4 AFTER ADJUSTING THE PLUG LOADING SCREW, refit the lock nut or protector cap, but do not over-tighten.
PLUG REVERSAL, AND GEAR UNITS
7.4 ROTATING PLUG THROUGH 180 DEGREES
Most TIPV plug valves are used where the flow is always in one direction. As TIPV are primarily
downstream seating, the downstream seat takes the brunt of the wear and tear from normal usage.
Typically the downstream face of the plug erodes first and causes leakage. There can be instances
where the downstream plug seat is eroded while the upstream plug seat is still in good condition -
by rotating the plug through 180 degrees, the good condition plug seat becomes the downstream seat
and leakage will be stopped or substantially reduced, so extending the valve life.
CAUTION: Do not undertake this procedure with product flowing through the valve.
7.4.1 ROTATING THE PLUG ON WRENCH OPERATED TIPV VALVES
The ‘V’ shaped position indicator plate attached to the stem, stops the valve from being rotated more
than 90 degrees. To rotate through 180 degrees, slide the snap-ring and position indicator plate off the
valve stem and rotate the plug one half turn using the correct Serck Audco wrench. Refit the position
indicator plate and snap-ring. Retest the valve seats as appropriate.
7 MAINTENANCE (cont.)
15 flowserve.com
Serck Audco TIPV Twin Isolation Plug Valve FCD - SRENIM0005-04 (A4) – 02/14