Instruction Manual
D103545X012
Control-Disk NPS 14-36
April 2011
10
Figure 6. Optional Shaft‐to‐Valve Body Bonding Strap Assembly
VALVE BODY
ACTUATOR
A
A
VIEW A‐A
37A6528‐A
A3143‐2
CAUTION
For non‐ENVIRO‐SEAL packing: Tighten the packing follower nuts only enough to prevent shaft leakage. Excessive
tightening will accelerate wear of the packing and could produce higher friction loads on the valve stem.
1.
For PTFE or graphite 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.
2.
The ENVIRO‐SEAL Packing Systems
will not require this initial re‐adjustment. Refer to the separate instruction
manual ENVIRO‐SEAL Packing System for Rotary Valves, D101643X012,
for repair and adjustment procedures.
3. For hazardous atmosphere or oxygen service valves, read the following
Warning
, and provide the bonding strap
assembly mentioned below if the valve is used in an explosive atmosphere.
WARNING
The valve 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 PTFE packing is composed of a partially conductive carbon‐filled PTFE female adaptor with PTFE V‐ring packing. Standard
graphite packing is composed of all conductive graphite ribbon 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).
For oxygen service applications, provide alternate shaft‐to‐valve body bonding according to the following step.
4. Attach the bonding strap assembly (key 131, figure 6) to the shaft with the clamp (key 130, figure 6).
