Fisher EUT-2 Instruction Manual page 9

Instruction Manual
August 2010
CU4317 / IL
valve stem. This locknut will prevent
the valve plug and stem assembly
from dropping out of the bonnet.
WARNING
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. 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. If the cage
sticks to the bonnet, proceed carefully
with bonnet removal.
Figure 5. Typical Globe Valve Bonnet
4. Hex nuts (key 16, figures 7 or 8) attach the
bonnet to the valve body. Loosen these nuts or cap
screws 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,
remove the nuts completely and carefully lift the
bonnet (key 1, figure 5).
5. Set the bonnet on a protective surface to prevent
damage to the bonnet gasket surface.
6. Whenever the bonnet has been removed, replace
the bonnet gasket and the cage gasket (keys 10
and 11, figures 7 and 8). Remove the bonnet gasket.
7. Lift the valve plug and stem assembly out of the
valve body and set it on a protective surface. If the
valve plug is to be reused, protect the valve plug
seating surface to prevent scratches.
EU and EW Series Valves
Note
The following step also provides
additional assurance that the valve
body fluid pressure has been relieved.
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