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