Instruction Manual
D101634X012
HP and HPA Valves
October 2014
9
When using packing with a lantern ring (key 24) it may be possible to add packing rings above the lantern ring as a
temporary measure without removing the actuator from the valve body.
1. Isolatethecontrolvalvefromthelinepressure,releasepressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut-off all pressure lines to the power
actuator,releaseallpressurefromtheactuator.Uselock-outprocedurestobesurethattheabovemeasuresstayin
effect while you work on the equipment.
2. Remove the packing flange nuts (key 21) and lift the packing flange, upper wiper, and packing follower (keys 19, 27,
and 28) away from the valve body.
3. Itmaybepossibletodigouttheoldpackingringsontopofthelanternring,butusecaretoavoidscratchingthe
valve plug stem or packing box wall. Clean all metal parts to remove particles that would prevent the packing from
sealing.
4. Remove the stem connector and slip the packing rings over the end of the valve plug stem.
5. Reassemble the packing follower, upper wiper, packing flange, and packing flange nuts (keys 28, 27, 19, and 21).
6. Reconnect the body-actuator stem connection according to the appropriate actuator instruction manual.
7. Tighten the packing flange nuts only far enough to stop leakage under operating conditions. Check for leakage
around the packing follower when the valve is being put into service. Retighten the packing flange nuts as required
(see table 7).
Replacing Packing
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
Key numbers referred to in this procedure are shown in figure 16, 17, o r 18, unless otherwise indicated.
1. Isolatethecontrolvalvefromthelinepressure,releasepressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut-off all pressure lines to the power
actuator,releaseallpressurefromtheactuator.Uselock-outprocedurestobesurethattheabovemeasuresstayin
effect while you work on the equipment.
2. Removethecapscrewsinthestemconnector,andseparatethetwohalvesofthestemconnector.Thenexhaustall
actuator pressure, if any was applied, and disconnect the actuator supply and any leakoff piping.
3. Removeeithertheyokelocknut(key32)orthehexnuts(key30),andremovetheactuatorfromthebonnet(key
18).
4. Loosen the packing flange nuts (key 21) so that the packing (keys 22, 23, 209, or 210, figure 3) is not tight on the
valve plug stem (key 6). Remove any travel indicator disk and stem locknuts from the valve plug stem threads.
CAUTION
When lifting the bonnet (key 18), be sure that the valve plug and stem assembly (keys 5 and 6) remains on the seat ring
(key 4). This avoids damage to the seating surfaces a s a result of the assembly dropping from the bonnet after being lifted
part way out. The parts are also easier to handle separately.
Use care to avoid damaging gasket sealing surfaces.
The HPD and HPAD piston rings (key 8) are brittle and in two pieces. Avoid damaging the piston rings by dropping or rough
handling.
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