Fisher EHD series Instruction Manual page 8

EH Valves NPS 8 through 14
June 2017
Key numbers referred to in this procedure are shown in figure 11 unless otherwise indicated.
1. Remove the stem connector cap screws shown in figure 3, and separate the two halves of the stem connector. Then
exhaust all actuator pressure, if any was applied, and disconnect the actuator supply and any leakoff piping.
2. Remove the hex nuts (key 26) and remove the actuator from the bonnet (key 1). Loosen the packing flange nuts
(key 5) so that the packing (key 6, or 7 and 9, figure 4) is not tight on the valve plug stem (key 4, figure 12 or 14).
Remove any travel indicator disk and stem locknuts from the valve plug stem threads.
WARNING
Do not remove a stuck bonnet by pulling on it with equipment that can stretch or store energy in any other manner. The
sudden release of stored energy can cause uncontrolled movement of the bonnet. To avoid personal injury or property
damage caused by uncontrolled movement of the bonnet, loosen the bonnet by following the instructions in the next step.
Figure 3. Actuator Mounting
STEM
CONNECTOR
CAP SCREWS
15A4691‐A
A2359‐2
Note
The following step also provides additional assurance that the valve fluid pressure has been relieved.
3. Hex nuts (key 14, figures 12 and 14) attach the bonnet to the valve body. Loosen these nuts approximately 3 mm
(1/8 inch). Then loosen the body‐to‐bonnet gasketed joint by either rocking the bonnet or prying between the
bonnet and valve body. Work the prying tool around the bonnet until the bonnet loosens. If no fluid leaks from the
joint, proceed with the bonnet removal in step 5.
WARNING
If the cage sticks to the bonnet, proceed carefully with bonnet removal until the cage windows are accessible. Do not
extend hands or arms through the windows at this point as a sudden separation of bonnet and cage will cause personal
8
ANTI‐ROTATION GROOVE
TRAVEL INDICATOR
STEM CONNECTOR
POINTER
STEM LOCKNUTS
MOUNTING STUDS & NUTS
Instruction Manual
D100392X012