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Instruction manual

ManualsBrandsEmerson Manualsmotor vehicle accessories & componentsA31D
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Instruction Manual
D500248X012
A31D Valve
April 2014
8
Refer to table 2 for the quantity and size of line bolting required to install the valve i n the pipeline.
CAUTION
To avoid damage to the valve disk during installation, the valve must be in the fully closed position. If the A31D valve is
equipped w ith a fail-open actuator, remove the actuator before installing the valve/actuator assembly or cycle the valve
into the fully closed position. Then, take appropriate steps to be sure that the actuator does not cause the valve to open
during installation.
Figure 3. Properly Installed Valve
GE62595-A
1. Seefigure3forrecommendedvalveorientation.
2. Position the valve between the flanges. Be sure to leave enough room for the flange gaskets. Install the lower flange
bolts.
3. Select the appropriate gaskets for the application. Flat sheet, spiral wound, or other gasket types, made to the
ASME B16.5 standard or user's standard, can be used on A31D valves depending on the service conditions of the
application.
4. Install the remaining flange bolts.
5. Tighten the flange bolts in an alternating criss-cross fashion to a torque value of one-fourth of the final bolting
torque. Repeat this procedure several times, increasing thetorquevalueeachtimebyafourthofthefinaldesired
torque. After applying the final torque value, tighten each flange bolt again to allow for gasket compression.
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 c onditions. Check with your process of safety engineer for any
additional measures that must be taken to protect against process media.
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.