Emerson Fisher POSI-SEAL A81, Инструкция по эксплуатации

Страница: 7 / 24

Instruction Manual
D103302X012
A81 Valve
January 2011
7
WARNING
An A81 valve body is not necessarily grounded when installed in a pipeline. If the valve is used in a flammable or hazardous
atmosphere or for oxygen service, an explosion could result due to a discharge of static electricity from the valve
components. To avoid personal injury or property damage, always make sure the valve body is grounded to the pipeline
before putting the control valve assembly into operation in a flammable or hazardous atmosphere.
Note
Standard packings for the A81 valve are composed of all conductive packing rings (graphite ribbon packing) or partially conductive
packing rings (such as a carbon‐filled PTFE female adaptor with PTFE V‐ring packing) to electrically bond the shaft to the valve
body for hazardous area service. For oxygen service applications, provide alternate shaft‐to‐valve body bonding according to the
following step.
9. For oxygen service 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 the bonding strap assembly to the valve body with the cap screw
(key 35). Secure each cap screw with a hex nut (key 36).
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however, the packing
might require some readjustment to meet specific service conditions.
Figure 3. Optional Shaft‐to‐Valve Body Bonding Strap Assembly