Flowserve Valtek Mark 14 - Manual (Page 9)


Valtek Mark 14 Control Valves FCD VLENIM0115-00 – 06/06
flowserve.com
6.7 Place lifting rings in both gland flange bolt holes in the bonnet and slowly pull the bonnet,
retaining ring segments, bonnet seal spacer and the bonnet pressure-seal out of the body.
WARNING: It is possible for the plug to lift out with the bonnet. If the plug were then to fall free, it
could damage the plug and cause damage to the other equipment as well as injury to personnel.
If the plug begins to lift as the bonnet is removed, tap the top of the plug stem with a rubber
mallet to keep the plug in place. Do not remove the plug with the bonnet.
NOTE: The pressure seal may expand as it passes by the retaining ring groove and prevent the
bonnet from coming out. In this event, lower the bonnet back down into the body and remove the
pressure seal independently.
6.8 To replace packing or change the packing box configuration, push out packing, spacer and
guides with a dowel slightly larger than the plug stem from underneath the bonnet.
6.9 Remove the pilot plug assembly from the valve by lifting on the plug stem threads. For
instructions on working with pilot operated plug assemblies please refer to Pilot Operated
Trim IOM (Document number VLENIM0064). To obtain a PDF of this IOM, visit
www.flowserve.com
6.10 With a long extension on a socket head ratchet, remove the seat retaining ring bolts. Remove
the four seat retaining ring segments. Two of the retaining rings are locked into position by the
other two rings. See Figure 1 to determine which rings must be removed first.
6.11 Place two threaded lifting rings in the seat ring lifting holes. Carefully lift the seat ring
assembly, disk spring retainer, disk spring, seat seal retainer and the seat seal out of the body.
NOTE: The pressure seal may expand as it passes by the retaining ring groove and prevent the seat
ring from coming out. In this event lower the seat ring back down into the body and remove the
pressure seal independently.
6.12 If the seat ring seating surfaces need re-machining, both surfaces on the plug and seat ring
must be reworked. The seat angle on the plug is 36 degrees and the seat ring is 33 degrees
with respect to the centerline. Lapping is not necessary
6.13 If the seat surface is to be refinished the seat may be left attached to the severe service trim as
long as steps are taken to cover the openings of the trim to prevent metal chip ingress.
6.14 If removal of the severe service stack is required, grind the tack welds off of the socket head
bolts and remove each bolt from the seat ring.
6.15 The lower MegaStream plate is not intended to be removed. If it needs to be removed, the
retaining ring would have to be carefully machined out of the body and the threads in the body
would have to be re-tapped.
NOTE: Carefully inspect the primary plug lower skirt guiding surface and severe service trim bore
for signs of galling and scoring. Superficial scoring can be removed with a light application of emery
cloth. If more serious scoring exists, contact your local Valtek control valve representative.
NOTE: Damaged pilot springs should be replaced.
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