Baker Hughes Masoneilan 525 Seris, Инструкция по эксплуатации

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Masoneilan Regulators Models 525 & 526 Manual | 6
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C. By means of a hooked instrument, remove packing (16)
insuring not to damage the sealing surfaces of the packing
box or plug stem.
Note: On valves equipped with an optional lubricator
connection, the lantern ring (17) must also be removed
to gain access to lower packing rings.
D. Replace packing rings (16).
Note: Assemble and compress rings one at a time into
packing box. The skive cut of each packing ring must
be placed about 120 degrees apart.
Note: On valves equipped with an optional lubricator
connection, refer to Figure 2 for correct amount of rings
to place under the lantern ring (17).
E. Replace packing follower (12) and packing flange (13).
F. Replace and tighten packing stud nuts (15).
Do not over tighten.
G. Place valve back in service and only tighten packing as
necessary to stop external leakage.
Note: In an emergency, string packing may be used as
a temporary repair only. It must be replaced with the
correct packing as soon as possible.
8. Valve Body Reassembly
After completion of the required maintenance, the valve should
be reassembled using the following procedures:
Note: If any of the following steps were completed during
maintenance, then proceed to the next step.
8.1 525 (Reducing Service)
A. CIean all gasket mating surfaces.
B. Apply a small amount of sealant to the seat ring threads and
sealing shoulders. Install seat rings into valve body.
Note: A sealant compatible with the process should be
applied sparingly.
C. lnstall and tighten seat rings using wrench used for removal.
Do not over-tighten. Do not strike seat ring lugs
directly. This could distort the seat ring resulting in
unwarranted seat leakage.
D. Install body-blind head gasket
E. Install blind head
Tighten nuts (10) until metal to metal contact is
obtained with proper bolt torque. Refer to Table 1 for
properbolttorqueandtighteningsequencespecifica -
tions.
F. Carefully install plug and stem assembly, carefully inserting
lower guide into lower bushing.
Note: Valve should be lapped before final assembly.
See Section 8.3.
G. Install body gasket (22).
Note: Spiral wound body gaskets (22) are standard in
the 500 Series design. It is imperative that a new gasket
be installed each time the valve is disassembled.
H. Assemble bonnet (10) and body stud nuts (21). Bonnet
must be positioned so the packing flange studs are at 90°
to the flow center line.
Tighten nuts (21) until metal to metal contact is
obtained with proper bolt torque. Refer to Table 1 for
properbolttorqueandtighteningsequencespecifica -
tions.
I. lnsert packing (16) (and lantern ring (17) on valves equipped
with an optional lubricator connection). Refer to Section 8.5
for proper packing assembly procedure for standard or
optional designs.
J. Install packing follower (12) and packing flange (13).
K. lnstall packing flange stud nuts (15).
Do not over tighten (See Section “8.5. Packing Box”).
L. If a leak detection connection was installed, connect it on
the lateral NPT port in the bonnet. If not, insure that the 1/4”
NPT plug remained in place (Figure 2).
M. For actuator assembly and plug stem adjustment, proceed
as per the Instruction Manual 31593 for 10900 Series
Actuators.
8.2 526 (Back Pressure Service)
A. CIean all gasket mating surfaces.
B. Apply a small amount of sealant to the seat ring threads and
sealing shoulders. Install seat rings into valve body.
Note: A sealant compatible with the process should be
applied sparingly.
C. lnstall and tighten seat rings using wrench used for removal.
Do not over-tighten. Do not strike seat ring lugs
directly. This could distort the seat ring resulting in
unwarranted seat leakage.
Note: Valve should be lapped before final assembly. See
Section 8.3.
D. Carefully install plug and stem assembly into valve body.
E. Install body-blind head gasket
F. Install blind head, carefully inserting lower guide into lower
bushing.