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Instruction Manual
D104709X012
D Select and install two pipe line gaskets.
4. Install the remaining line flange bolting to secure the valve in the pipeline. Tighten the nuts to the line flange studs
in a crisscross pattern to ensure proper alignment of valve, gaskets, and flanges.
Packing Adjustment and Shaft Bonding
WARNING
Personal injury could result from packing leakage. Valve packing was tightened before shipment; however the packing
might require some readjustment to meet specific service conditions. Check with your process or safety engineer for any
additional measures that must be taken to protect against process media.
CAUTION
Use caution when tightening packing follower nuts because over‐tightening the nuts will accelerate wear and could
produce higher rotating friction loads on the valve stem.
D PTFE packing: tighten standard packing follower nuts only enough to prevent shaft leakage. Excessive tightening of
packing will accelerate wear and could produce higher rotating friction loads on the valve stem. If necessary, refer
to the Packing Maintenance section.
WARNING
The valve drive shaft is not necessarily grounded to the pipeline when installed. Personal injury or property damage could
result from an explosion caused by a discharge of static electricity from the valve components if the process fluid or the
atmosphere around the valve is flammable. To avoid personal injury or property damage, make sure the valve is grounded
to the pipeline before placing the valve assembly into service.
Standard PTFE packing is composed of a partially conductive carbon‐filled PTFE female adaptor with PTFE V‐ring packing.
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).
1. Attach the bonding strap assembly (key 131, figure 5) to the shaft with the clamp (key 130, figure 5), and connect
the other end of the bonding strap assembly to the valve with the cap screw (key 14, figure 5).
2. For more information, refer to the Packing Maintenance subsection below.
8540 Valve
September 2021
7
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