Masoneilan 71000 Series Control Valve Instruction Manual | 10
Copyright 2023 Baker Hughes Company. All rights reserved.
6.0 Reassembly
Replace all parts with significant dimensional defects caused by
the corrosion, erosion or wear. It is also necessary to replace the
gasket (B009), the guide gasket(s), if applicable, (B010) and the
packing (B011) with new parts after each disassembly.
•
Clean all gasket mating surfaces
•
Replace the seat ring (B002) in the valve body. Apply a small
amount of sealant to the seat ring retainer (B001) threads
and sealing shoulder, and screw and lock the seat ring
retainer (B001) with the torque values indicated in the table
below for each valve size.
Note: A sealant compatible with the process should be
applied sparingly on the retainer thread.
•
Insert the plug guide (B006) in the valve body following with
the plug (B005) fitted with its stem (B008). Place the gasket
(B009) on the body.
Center the guide gasket (B010) on the top of the guide (B006),
and then place the bonnet down over the plug stem until it is
centered on the upper part of the guide.
•
Assemble the bonnet with the body by means of bonnet
studs (B033) and bonnet stud nuts (B032). Tighten the nuts
to obtain metal-to-metal contact between the bonnet and
valve body (size 8’’, 10’’ and 12’’ only) and/or tighten them
with torque value indicated in the table below for each valve
size.
•
Insert the packing as follows: first, one braided ring, then
the die-formed rings and finally another braided ring. It is
important to tamp down the rings in the packing box one by
one. If packing rings have a radial cut, stagger the cut of
adjacent rings by 180°.
•
Slip the packing follower and flange over the plug stem.
Tighten the nuts (B028) manually. Verify if the plug
accomplishes its normal stroke in the valve body. Tighten the
nuts (B028) to another full turn with the wrench.
•
Replace the actuator and fasten it by means of the yoke nut
(B013).
•
Be sure that the plug sits normally on the seat ring and
connect the actuator to airline or to electrical circuit.
•
Connect the actuator stem to the valve stem in accordance
with the appropriate actuator instruction manual. The 71000
Series most commonly uses the 51/52/53 Series piston
cylinder actuators, or the 87/88 spring diaphragm actuators.
•
Replace the valve on the piping, carry out the connections
and start it up again.
CAUTION
CAUTION
WARNING
DANGER
Do not over-tighten or strike seat ring (B002) or seat
ring retainer (B001) directly. This could distort the
seating area resulting in unwarranted seat leakage.
CAUTION
CAUTION
WARNING
DANGER
Care must be taken during assembly to ensure proper
alignment of the trim, and that the plug and plug guid-
ing surfaces do not get damaged.
CAUTION
CAUTION
WARNING
DANGER
For bonnet with purge or injection connection: NPT or
flange. Before achieving metal to metal contact with
the body, rotate the bonnet to orient this connection
in front of the existing piping.
