Instruction Manual
D100392X012
EH Valves NPS 8 through 14
July 2014
20
Figure7.StaketheThreadsoftheBoreSealRetainer
Bore Seal
METAL
PLUG
SEAL
VALVE
PLUG
FLOW DOWN
PISTON
RING
RETAINER
DEFORM THREAD TO
STAKE Bore Seal RETAINER
A6779
Figure8.InstallingtheBoreSealPlugSeal
Using the Installation Tool
Bore Seal
METAL
PLUG
SEAL
INSTALLATION
TOOL
A6778
VALVE
PLUG
HORIZONTAL
REFERENCE
SURFACE
FLOW DOWN
NOTE: PRESS THE INSTALLATION TOOL OVER THE VALVE PLUG UNTIL THE TOOL
CONTACTS THE HORIZONTAL REFERENCE SURFACE OF THE VALVE PLUG.
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 9).
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 9).
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 9) 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
valveplugcontactstheseatring.ThesecondseatingsurfaceisfoundwheretheBoreSealplugsealcontactstheupper
seatingsurfaceinthecage.Thecagedoesnotrequireanymachining, even when the plug and / or seat ring have been
machined.
Trim Replacement (Bore Seal Constructions)
1. Apply a suitable high-temperature lubricant to the inside diameter of the Bore Seal plugseal.Also,lubricatethe
outside diameter of the valve plug where the Bore S eal plug seal must be pressed into t he proper sealing position
(figure 5).
2. OrienttheBoreSealplugsealforcorrect sealing action based on the process fluid flow direction through the valve.
(24 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals