Masoneilan 21000 Series Top Guided Globe Valve Instruction Manual | 31
Copyright 2023 Baker Hughes Company. All rights reserved.
CAUTION
CAUTION
WARNING
DANGER
Care must be taken to avoid damage to the plug and cage.
F.
All components may now be inspected for wear and service
damage. After determining the maintenance required,
proceed to the appropriate Section of this instruction
manual.
6. Maintenance & Repair
The purpose of this section is to provide recommended
maintenance and repair procedures. These procedures assume
the availability of standard shop tools and equipment.
Before reassembly check parts and the materials for conformity
to the bill of material call out. Inspect inside of body (B001),
cages (B102) and plug/stem (B149) for cleanliness.
Remove any foreign matter and clean the gasket surfaces.
Inspect body (B001), cages (B102), gasket (B103) and plug
stems (B149) for nicks, scratches, burrs, sharp corners, etc., on
sealing and sliding surfaces including packing box.
Note:
During assembly, care must be exercised to prevent
damage to these parts.
Since 21000 API 6A Series are high pressure valves, take care
about having no damaged on the sealing surfaces. Indeed,
performance of gaskets and seal are strongly linked to surface
roughness.
6.1 Packing Box
Prior to assembling the packing, ensure there are no nicks or
scratches on the stem and packing box inside diameter packing
area.
Violation of any of these requirements is cause for stem or
packing box rejection.
Tightness of the packing box is obtained by compression
of the packing rings (B207) and anti-extrusion rings (B208).
Compression must be achieved by evenly tightening the packing
flange nuts (B221) on the packing flange (B219). Periodical
retightening of the packing flange nuts is required to maintain
tightness.
Make sure that the packing is not over tightened as this could
prevent smooth operation of the valve.
If a leak persists after the packing has been compressed to a
maximum, the packing needs to be changed.
6.1.1. PTFE Based Packing
A.
Unscrew and remove the packing flange nut (B220) and
packing flat washer (B921).
B.
Lift the packing flange (B219) up along the valve stem.
C.
By means of a puller, remove the packing rings (B207) and
anti-extrusion rings (B208), taking care not to damage the
sealing surface of the packing box lantern or the valve plug
stem.
3. Unpacking
Care must be exercised when unpacking the valve to prevent
damage to the accessories and component parts. Contact the
local Baker Hughes Sales office or Service Center with any
issues or problems. Be sure to note the valve model number and
serial number in all correspondence.
4. lnstallation
4.1 Piping Cleanliness
Before installing the valve in the line, clean piping and valve of all
foreign material such as welding chips, scale, oil, grease or dirt.
Gasket surfaces should be thoroughly cleaned to ensure leak-
proof joints.
4.2 Isolation Bypass Valve
To allow for in-line inspection, maintenance or removal of the valve
without service interruption, provide a manually operated stop valve
on each side of the 21000 Series valve with a manually operated
throttling valve mounted in the by-pass line (See Figure 2).
4.3 Flow Direction
The valve must be installed so that the process fluid will flow
through the valve in the direction indicated by the flow arrow
located on the body.
•
With contoured plug (21100)
4.4 Heat Insulation
For heat-insulated installation,
insulate up to body/actuator
interface.
Take necessary protective measures relate to
personal safety.
5. Body Disassembly
Access to the internal components of the body (B001) should be
accomplished with the actuator removed. To remove the actuator
from the body (B001), refer to the actuator instructions.
CAUTION
CAUTION
WARNING
DANGER
Prior to performing maintenance on the valve, isolate the
valve and vent the process pressure. Shut off the supply
air line and the pneumatic or electric signal line.
Note:
The valve must always be reassembled with new
packing rings and gaskets; before disassembly, make sure
that the appropriate parts are available.
After removing the actuator, disassemble the body sub assembly
using the following procedure:
A.
Remove packing nuts (B221), washers (B921) and studs
(B220)
B.
Remove packing ring (B207) and anti-extrusion rings (B208)
C.
Remove packing spacer (B202)
D.
Unscrew trim retainer (B105)
E.
Remove plug/stem (B149)
