Instruction manual

Instruction Manual
D500248X012
A31D Valve
April 2014
9
Figure 4. 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 e nough to prevent shaft leakage. Excessive
tightening will accelerate wear of the packing and could produce higher friction loads on the valve stem.
2. ENVIRO-SEAL Packing Systems: will not require this initial re-adjustment. Refer to the separate instruction manual,
Fisher 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.