Emerson Fisher easy-e ED Instruction Manual download pdf (Page 10)

Instruction Manual

D100391X012

EDR and ETR Valves

April 2011

Figure 4. Bonnet Assembly

PACKING

BOX

NOTE:

REFER TO FIGURE 5 OR 6 FOR PACKING ARRANGEMENTS.

10A6681‐A

CAUTION

To prevent possible product damage, avoid scratching the packing box walls when removing old packing parts. Also

inspect valve stem threads and packing box surfaces for sharp edges which may damage packing.

6. Avoid scratching the packing box walls when removing the old packing parts. Clean the packing box (see figure 4),

and clean, inspect, or replace metal packing parts. Generally, the metal packing parts are not part of the packing

kits listed in the Parts List section, and they must be ordered individually.

7. Inspect the valve stem threads and packing box surfaces for any sharp edges which might cut the packing.

Scratches or burrs on the stem surfaces can cause packing box leakage or damage to new packing. If the surface

condition cannot be improved by light sanding, replace the damaged parts by following the appropriate steps in

the Trim Maintenance procedure.

Note

If the control valve assembly was purchased for an application where the service temperatures are under 232_C (450_F), the

bonnet may be unscrewed from the valve body. Where temperatures are greater than 232_C (450_F), the bonnet is seal welded to

the valve body.

CAUTION

To prevent possible product damage, set the bonnet on a protective surface in the following procedure.

8. If necessary, remove the bonnet assembly from the valve by unscrewing it. Some applications require seal welding

the bonnet to the valve body, and the bonnet should not be removed. Set the bonnet on a protective surface to

prevent damage to the bonnet gasket surface.

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Emerson Fisher easy-e ED Instruction Manual Page 10