Flowserve Serck Audco Twin Isolation Plug Valve - Manual (Page 14)

7.2.4 RELOADING THE STEM PACKING COMPOUND INJECTOR
If the hexagon socket/headed screw bottoms out inside the SPCIU, and the stem is still leaking, then more
stem packing compound needs to be loaded into the SPCIU. This is done by removing the hex socket/headed
screw and putting a new piece of Serck Audco stem packing compound into the SPCIU and energizing it with
the hexagon socket /headed screw. To the torque values listed above (section 7.2.3). Note: always apply
Anti - seize to the stem packing before injection.
CAUTION: Never unscrew the stem packing compound injector out of the TIPV valve body while
the valve is under pressure.
7.3 ADJUSTMENT OF THE PLUG LOADING SCREW
The plug loading screw is preset at the factory to position the tapered plug in optimum contact with the
tapered body, i.e. the valve will seal off bubble tight and be readily operated. Most users of TIPV plug
valves will never need to adjust this fitting, but occasionally it can be of benefit to adjust the plug into
or out of the body seat.
Equipment Needed: Adjustable crescent wrench;
Hammer, and steel punch, (to loosen cap over plug loading screw.)
7.3.1 WHEN TO ADJUST THE PLUG LOADING SCREW
If a TIPV plug valve leaks across the seats even after injection of sufficient sealant onto the valve
seats and is very easy to operate, then the plug is probably not in close enough contact with the body
seat, and needs to be adjusted into the tapered body seat.
NOTE: Damaged metal seats can also produce these symptoms.
If a TIPV plug valve is very hard to operate, even after injection of sufficient sealant, then the plug
could be pushed too far into the tapered body seat and needs adjusting out a little.
NOTE: Solids from the media (slurries, etc.) and from sealants with high levels of clay filler can also
make the valve hard to turn.
7.3.2 ADJUSTING THE PLUG LOADING SCREW
This operation can be carried out with the valve on pressure.
7.3.2.1 EXPOSE THE PLUG LOADING SCREW
Identify the lock nut or cap that protects the plug loading screw. It is located in the centre of the valve
cover. Remove the lock nut or cap by unscrewing it (counter-clockwise viewed from below the valve).
On valves with cast caps there is a notch on the edge into which a steel punch can be inserted and
tapped to loosen the cap.
7.3.2.2 ADJUSTING INTO THE TAPERED SEATS
To adjust the plug into the body seat, use an adjustable crescent wrench to tighten the plug loading
screw until it becomes significantly harder to turn. It should take no more than one turn to tighten the
plug loading screw, unless the it has already been slackened off. Once the plug loading screw feels
tight enough, back it off by 1/8th of a turn.
CAUTION: Do not over-tighten the plug loading screw as this will jam the plug into the body seat.
7 MAINTENANCE (cont.)
Serck Audco TIPV Twin Isolation Plug Valve FCD - SRENIM0005-04 (A4) – 02/14
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