4 | Baker Hughes
Copyright 2020 Baker Hughes Company. All rights reserved.
Air-to-Retract Actuators
Apply sufficient air pressure to the actuator to retract the stem
completely. Disconnect the plug stem from the actuator stem
depending on the connection type as described below.
Threaded Connection
Unscrew the plug stem from the actuator stem, making sure the
plug never contacts the seating area (liner or seat ring) at any
time during disassembly.
CAUTION
CAUTION
WARNING
DANGER
Contact between the plug and seating area during this
disassembly process may cause damage to the seating
surfaces. It may be necessary to disassemble the actua-
tor yoke from the valve bonnet and lifting the actuator
off the valve to avoid plug to seating surface contact.
Split Clamp Connection
Remove the screws and disassemble the stem connector from the
valve and actuator stem.
Air-to-Extend Actuators
For this actuator configuration, the valve plug is already in the fully
retracted position without any air pressure applied. Disconnect
the plug stem and actuator stem as described in the threaded
connection and stem connector sections above depending on the
connection type.
Actuator Removal
Disconnect all electrical and air connections to and from the
actuator. Disassemble yoke nut or yoke attachment screws, and
lift the actuator off of the valve being careful not to damage the
bonnet threads
Valve Disassembly
The valve must always be reassembled with new packing set and
gaskets. Before disassembly, make sure the recommended spare
parts are available for reassembly.
1. Disconnect the piping to the leak detector connection on the
bonnet (if applicable).
2. Remove the packing flange nuts (19) then remove the packing
flange (17) and the packing follower (16).
3. Check the exposed part of the valve stem (8) to confirm it is
clean enough for ease of removal of the bonnet (2).
4. Remove the body nuts (13).
For valve configurations designed with a two piece bonnet
assembly (bonnet and bonnet flange):
5. Disassemble the bonnet flange (3) from the valve body (1).
6. Lift the bonnet (2) and metal seal (11) to remove from the
valve body (1). During this operation, the valve stem (8) must
be pushed downward to ensure the valve plug (6) remains
inside the valve body.
Note: The metal seal (11) will require some force to
remove from the bonnet (2). Using a common tool, such
as a small pry bar, lever the seal up at various points to
lift out evenly.
7. Remove the cage gasket (10A) from the top of the valve
cage (4). Proceed to step 10.
For valve configurations designed with a single piece bonnet:
8. Lift the bonnet (2) and remove from the valve body (1).
During this operation, the valve plug stem (8) must be pushed
downward to ensure the valve plug (6) remains inside the
valve body (1).
9. Remove the body gasket (Not Shown) from the groove on top
of the valve body (1).
10. Remove the valve plug assembly (6) from the valve cage by
pulling the valve plug stem (8) upward.
11. Remove the cage (4) by lifting the part out of the valve
body (1).
12. Remove the seat ring (5) by lifting the part out of the valve
body (1).
Note: The upper seat ring gasket (24) is located on the top
groove of the seat ring.
13. Remove the lower seat ring gasket (24) from the valve body
(1).
14. Remove the packing set (11) and the guide bushing (26)
from the bonnet (2).
Plug Stem Disassembly
CAUTION
CAUTION
WARNING
DANGER
The valve plug assembly is screwed and pinned to en-
sure stability and performance. Due to the critical pur-
pose of the plug assembly and tolerance requirements,
Baker Hughes highly recommends avoiding in the field
maintenance of this part. The plug assembly should be
purchased as a complete assembly. However, if urgent
field repair is required, follow the instructions below.
The valve plug stem is screwed into the valve plug (6) and pinned.
To disassemble the stem, the valve plug must be held as shown
below in Figure 1, taking care not to damage the guiding surfaces.
Disassemble the plug stem groove pin (9) from the assembly.
Pilot Dismounting Screw Sizes
Diameter
Qty.
1/4"- 20 UNC 2A
57.0
2
3/8"- 16 UNC 2A
63.5
2
Valve Size
mm
in.
150
6
200
8
70.0
2
101.5
3
250
10
300
12
101.5
3
400
16
Length
mm
in.
2.25
2.50
2.75
4.00
4.00
Figure 1: Correct Plug Clamping Surface
