Fastener Torque Table For Valve Body To Topworks - Emerson 903 Installation, Operation And Maintenance Manual

Installation
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

Table 1: PAS bonnet (963)
Values given are for lubricated fasteners.
Valve size, inches (DN)
Inches
0.50
0.75
1.00
1.50
2.00
2.50
3.00
4.00
Table 2: Metal bonnet (903, 913)
Values given are for lubricated fasteners.
Valve size
Inch
0.50
0.75
1.00
1.25 and 1.50
2.00
2.50
3.00
4.00
NOTICE:
1. Make multiple criss-cross passes to build up torque to final table values. Make additional
criss-cross passes using table vales to evenly tighten each bolt to within 5% of stated
torque.
2. Values given are for lubricated fasteners.
3. Minimum values given will provide longer diaphragm cycle life for valves in non-autoclave
and low thermal cycle conditions.
4. Maximum values given will be required for autoclave conditions and for high thermal cycle
conditions.
5. Torques should be applied at or near ambient conditions <38°C |100°F.
8
Replace the valve diaphragm
PTFE diaphragm
DN in-lb
15 20-50
20 40-70
25 45-80
40 145-170
50 225-275
65 500-830
80 500-830
100 200-575
PTFE diaphragm
DN in-lb
15 25-80
20 50-80
25 65-120
32 and 40 200-225
50 225-300
65 750-1000
80 750-1000
100 540-600
Handwheel Operated Valves (903, 913, 963) Installation, Operation, and Maintenance Manual
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).
N-m
2.3-5.7
4.5-7.9
5.1-9.1
16-19
25-31
57-94
57-94
23-65
N-m
2.8-9.1
5.7-9.1
7.4-13.6
23-25
25-34
85-113
85-113
61-68
Designed and Manufactured by ITT
Elastomer diaphragm
in-lb N-m
20-40 2.3-4.5
20-50 2.3-5.7
25-70 2.8-7.9
75-130 8.5-14.7
100-180 11-20
300-420 34-48
300-420 34-48
180-220 20-25
Elastomer diaphragm
in-lb N-m
20-40 2.3-4.5
20-50 2.3-5.7
45-70 5.1-7.9
75-130 8.5-14.7
100-180 11-20
300-420 34-48
300-420 34-48
190-230 22-26