Instruction Manual

Instruction Manual
D103553X012
Large ET and ED Valves
September 2014
22
Figure10.StaketheThreadsoftheBoreSealRetainer
Bore Seal
METAL
PLUG
SEAL
VALVE
PLUG
FLOW DOWN
PISTON
RING
RETAINER
DEFORM THREAD TO
STAKE Bore Seal RETAINER
A6779
4. Locate the break between sections of the piston ring(s). Using an appropriate tool such as a flat-blade screwdriver,
carefully pry out the piston ring from the groove in the Bore Seal retainer.
5. After removing the piston ring, locate the 1/4-inch diameter hole in the groove.
6. Selectanappropriatetoolsuchasapunchandplacethetipofthetoolintotheholewiththebodyofthetoolheld
tangent to the outside diameter of the retainer. Strike the tool with a hammer to rotate the retainer and free it from
thevalveplug.Removetheretainerfromtheplug.
7. Use an appropriate tool such as a flat-blade screwdriver to pry the Bore Seal plug seal off the plug. Use caution to
avoid scratches or other damage to the sealing surfaces where the Bore Seal plug seal makes contact with the valve
plug (figure 11).
8. Inspect the lower seating surface where the valve plug contacts the seat ring for wear or damage which would
prevent proper operation of the valve. Also, inspect the upperseatingsurfaceinsidethecagewheretheBoreSeal
plugsealcontactsthecage,andinspectthesealingsurfacewheretheBoreSealplugsealmakescontactwiththe
plug (figure 11).
9. Replace or repair trim parts according to the following procedure for lapping metal seats, remachining metal seats,
or other valve plug maintenance procedures as appropriate.
Lapping Metal Seats (Bore Seal Constructions)
Before installing a new Bore Seal plug seal, lap the lower seating surface (valve plug to seat ring, figure 11) following
appropriate procedures in the Lapping Seats section of this manual.
Remachining Metal Seats (Bore Seal Constructions)
A valve plug with a Bore Seal metal plug seal features two seating surfaces. One seating surface is found where the
valve plug contacts the seat ring. The second seating surfaceisfoundwheretheBoreSealcontactstheupperseating
surface in the cage. The cage does not require any machining, even when the plug and / or seat ring have been
machined.