Design 461 Anti-Coke Valve Body

I Design 461
3. Use accepted piping practices when installing the valve.
4. Do not install the valve in a system where the service conditions exceed
those specified when the valve was ordered.
5. If continuous operation is required during maintenance and inspection,
install a three-valve bypass around the body so that it will be isolated.
6. Orient the body so that the flow will be in the direction indicated by
the flow direction arrow located on the outside of the valve body to
ensure proper self-cleaning action.
7. If the actuator and valve are shipped separately, refer to the actuator
mounting procedure outlined in the appropriate actuator instruction
manual.
MAINTENANCE
Valve parts are subject to normal wear and must be inspected and replaced as
necessary. The frequency of inspection and replacement depends upon the
severity of service conditions.
Replacing Packing
WARNING
To avoid personal injury and equipment damage, isolate
the control valve from the system, and release all
pressure from the body and actuator before starting
maintenance operations.
Refer to figure 1 unless otherwise indicated.
1. Turn the spring adjustor to release all spring compression in the actuator.
2. Disconnect the operating lines from the actuator. Disconnect the stem
connector, and then remove the actuator from the valve.
3. Remove the hex nuts (key 8, figure 2) from the bonnet flange, and loosen
the packing flange nuts (key 25) so that the packing is not tight on the
valve stem.
4. Lift the bonnet (key 14) off the valve stem (key 10, figure 2). If the
valve plug and stem assembly starts to lift with the bonnet, tap it back
down using a brass or lead haoxner on the end of the stem. Set the bonnet
on a cardboard or wooden surface to prevent damage to the bonnet gasket
surface.
5. Remove the packing flange nuts (key 25), packing flange (key 23), and
packing follower (key 29) from the bonnet (key 14).
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