Fisher CV500 Instruction Manual page 7

Instruction Manual
D101640X012
6. Install the flange gaskets and insert the valve between the mating pipeline flanges. Use flat sheet gaskets
compatible with the process media, or spiral wound gaskets with compression‐controlling center rings.
7. Install the line bolts and nuts; then, tighten them using accepted bolting procedures. These procedures include, but
are not limited to, lubricating the line bolts and hex nuts and tightening the nuts in a crisscross sequence to ensure
proper gasket load.
8. If a purge is desired for the purged bearing construction, remove the pipe plugs (keys 29 and 24) and install the
purge lines. Purge pressure should be greater than the pressure within the valve and the purge fluid should be as
clean as possible.
WARNING
A CV500 drive shaft is not necessarily grounded when installed in a pipeline unless the shaft is electrically bonded to the
valve.
To avoid personal injury or property damage resulting from the effects of a static electricity discharge from valve
components in a hazardous atmosphere or where the process fluid is combustible, electrically bond the drive shaft (key 3)
to the valve according to the following step.
Note
Standard CV500 packings (key 13) are composed either entirely of conductive packing rings (graphite ribbon packing) or partially
of conductive packing rings (a carbon‐filled PTFE female adaptor with PTFE V‐ring packing or a graphited‐composition packing ring
with PTFE/composition packing) in order to electrically bond the shaft to the valve body. Alternate shaft‐to‐valve body bonding is
available for hazardous service areas where the standard packing is not sufficient to bond the shaft to the valve (see the following
step).
9. For hazardous applications, attach the bonding strap assembly (key 131, figure 3) to the shaft with the clamp (key
130, figure 3) and connect the other end of bonding strap assembly to the valve body with the cap screw (key 25,
figure 3).
10. Connect pressure lines to the actuator as indicated in the actuator instruction manual. When a manual actuator
(handwheel) is used with a power actuator, install a bypass valve on the power actuator (if not already supplied) for
use during manual operation.
Figure 3. Optional Shaft‐to‐Body Bonding Strap Assembly
37A6528‐A
A3143‐2
VIEW A‐A
ACTUATOR
VALVE BODY
A
A
CV500 Valve
June 2017
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