Inverted Globe Valve Applications; (Actuator Below Valve); Maintenance - Fisher EWS Series Instruction Manual

EW Valve
initial re-adjustment. See Fisher instruction manuals,
ENVIRO-SEAL Packing System for Sliding-Stem
Valves or HIGH-SEAL Live-Loaded Packing System
(as appropriate), for packing instructions. If you wish
to convert your present packing arrangement to
ENVIRO-SEAL packing, refer to the retrofit kits listed
in the parts kit sub-section near the end of this
manual.

Inverted Globe Valve Applications

(Actuator below valve)

Due to space restrictions in your application, you
may be required to mount the valve/actuator
assembly in an inverted orientation, with the actuator
positioned below the valve. If so, the following
procedures will help you with disassembly and
assembly techniques.
WARNING
Avoid personal injury or property
damage caused by components
dropping.
With the valve/actuator upside down,
components may drop during
disassembly or assembly. Be careful
not to position yourself below the
valve in the path of falling parts.
As the bonnet/plug/cage is lowered
from the valve body, the center of
gravity will be above the lifting points.
Take care to prevent the assembly
from tipping over as it is lowered.
Either leave the actuator attached to
the plug and bonnet, attach straps to
the stem, or provide other means to
prevent tipping.
Disassembly
1. Provide adequate support to the actuator while
removing it from the bonnet.
2. Provide adequate support to the bonnet while
removing the bonnet nuts.
3. Be aware that the bonnet/plug/cage may tip over
as they are lowered from the valve body. Make
provision to prevent tipping.
6
4. Be aware that the cage and seat ring may not
come out with the bonnet and plug/stem assembly. If
this occurs, make provision to support these parts,
as they may fall out unexpectedly.
Assembly
1. Start this assembly procedure with the plug/stem
assembly already installed in the bonnet.
2. Put the gaskets and cage onto the bonnet and
plug.
3. Place the seat ring with the seat ring gasket onto
the cage, if applicable with the valve design.
4. Raise this bonnet/plug/cage assembly up into the
valve body. Make provision to prevent tipping of
these parts as they are being raised into the valve
body.
5. Torque the bonnet nuts.
6. Mount the actuator.

Maintenance

Valve parts are subject to normal wear and must be
inspected and replaced as necessary. Inspection
and maintenance frequency depends on the severity
of service conditions. This section includes
instructions for packing lubrication, packing
maintenance, trim maintenance, lapping metal seats,
and ENVIRO-SEAL bellows seal bonnet
replacement. All maintenance operations may be
performed with the valve in the line.
WARNING
Avoid personal injury or property
damage from sudden release of
process pressure. Before performing
any maintenance operations:
D Always wear protective gloves,
clothing, and eyewear when
performing any maintenance
operations to avoid personal injury.
D Disconnect any operating lines
providing air pressure, electric power,
or a control signal to the actuator. Be
sure the actuator cannot suddenly
open or close the valve.
D Use bypass valves or completely
shut off the process to isolate the
valve from process pressure. Relieve
Instruction Manual
Form 2376
March 2007