Emerson Fisher HP & EH Instruction Manual download pdf (Page 8)

Instruction Manual

D100392X012

EH Valves NPS 8 through 14

July 2014

Key numbers referred to in this procedure are shown i n 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 f rom 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 c an stretch or store energy in any other manner. The

sudden release of stored energy can c ause 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

ANTI-ROTATION GROOVE

TRAVEL INDICATOR

STEM CONNECTOR

POINTER

STEM LOCKNUTS

MOUNTING STUDS & NUTS

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

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Emerson Fisher HP & EH Instruction Manual Page 8