Flowserve Serck Audco Twin Isolation Plug Valve - Manual (Page 12)

7 MAINTENANCE (cont.)
7.1.4.5 START PUMPING
Inject sealant either by pumping the handle on a manual gun, or connecting the air supply to the
pneumatic gun. Monitor the pressure gauge during the sealant injection process. For sealant to flow
onto the valve seats, enough sealant at sufficient pressure has first to be injected to over come the line
pressure, to fill any cavities in the sealant chamber and grooves, and to overcome the flow resistance through
the valve sealant system.
Sealant is flowing onto the seats when the pressure gauge on the gun is significantly higher than the line
pressure and then falls slowly. Note that on low pressure valves the pressure required to inject sealant may be
significantly higher than the CWP.
With a valve that is regularly injected with sealant, the sealant pressure will quickly build up. A valve
that has not been well maintained could require a significant amount of sealant to be injected before
pressure builds up and sealant flows onto the seats. See Section 8 - ‘Trouble Shooting Guide’ for potential
injection problems.
7.1.4.6 DISCONNECT
After injection of sufficient sealant, relieve the internal pressure in the gun, and disconnect it from the
‘Giant Buttonhead’ fitting. CAUTION: The sealant gun should not be connected or disconnected while
it still has internal pressure.
7.1.4.7 OPERATE THE VALVE
It is desirable but not essential, to operate the valve either partially or fully after injecting sealant, to
help spread the sealant over the entire seating surfaces.
Serck Audco TIPV Twin Isolation Plug Valve FCD - SRENIM0005-04 (A4) – 02/14
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