Fastener Torque Table For Valve Body To Topworks - Emerson Asco Bio-Pure Installation, Operation And Maintenance Manual

Installation
2. Position diaphragm so that valve is slightly open.
For valves with an actuator, you may need to use regulated air pressure to actuate the
valve.
3. Tighten the bonnet fasteners in a crisscross pattern.
For more information, see
4. Make multiple crisscross passes to build up torque to the final table value. Make additional
crisscross passes using final table values to evenly tighten each fastener to within 5% of
torque value.
5. Retighten the bonnet fasteners as noted above at ambient conditions after the system has
cycled through operating pressure and temperature.
6. Monitor the valve for leakage:
If leakage ...
Occurs at the body/bonnet flange
sealing area
Continues
Continues
For more information, see

Fastener torque table for valve body to topworks

Values given are for lubricated fasteners.
DN
Bio-Pure
(8, 10, 15)
10
Fastener torque table for valve body to topworks
Replace the valve diaphragm
Valve size Bolt size
Inch Metric
Bio-Pure M4
(0.25,
0.375, 0.50)
Then ...
Depressurize the system and retighten the bonnet fasteners as
noted above.
Depressurize the system and retighten the bonnet fasteners as
noted above. (maximum 3rd re-torque)
Replace the valve diaphragm.
(page 13).
PTFE diaphragm
Imperial N-m
Not avail- 1.7-2.0
able
Bio-Pure Installation, Operation, and Maintenance Manual
(page 10).
Elastomer diaphragm
in-lb N-m in-lb
15-18 1.4-1.7 12-15
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