Instruction Manual Supplement
D104372X012
Large EH
August 2018
3
Trim Removal
Observe all warnings, cautions, and notes provided in the Large EH Instruction Manual (
). See figure 1
for assembly drawing
.
1. Before removing actuator and disassembling valve, isolate the valve from all pressure and relieve trapped pressure
from body and actuator.
2. Follow the instructions in D100392X012 to remove actuator and packing.
3. Loosen the bonnet bolting hex nuts one-fifth of one nut flat (1/30 of one revolution) to achieve initial breakout of
the nuts while transferring minimal additional loading to the adjacent nuts.
4. When the hex nuts have been loosened one-fifth nut flat, use the bolt loosening sequence (figure 2) and turn the
hex nuts an additional one-half nut flat.
5. Repeat the bolt loosening sequence, turning the hex nuts one-half nut flat each sequence until the hex nuts have
turned a total of two nut flats (after initial breakout). Then loosen the body-to-bonnet joint gasketed joint by either
rocking the bonnet or prying between the bonnet and body. Work the prying tool around the bonnet until the
bonnet loosens. If no fluid leaks from the joint, repeat the bolt loosening sequence to completely remove the hex
nuts.
Figure 2. Bolting Pattern
2
14
8
3
12
15
9
5
1
13
16
11
4
6
10
7
6. Thread eyebolts, or hoist rings, into the two holes (1-1/4 in X 7 UNB, 2-1/4 in deep) on the top of the bonnet. Attach
rigging equipment capable of lifting 3600 lb to the eyebolts or hoist rings.
7. Carefully lift the bonnet off the body. If the plug/stem assembly starts to lift with the bonnet, use a brass or lead
hammer on the end of the valve stem to move it back down. Set the bonnet on a protective surface to prevent
damage to the cage gasket surface.
8. Carefully lift the valve plug/stem assembly out of the body, taking care not to damage the seal ring on the plug.
Protect the valve plug stem and the valve seating surfaces to prevent damage.
9. Remove and discard the upper cage gasket.
