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FASANI BOLTED BONNET CHECK VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
TABLE 1 - BOLT TORQUE FIGURES FOR BODY-BONNET FLANGED CONNECTIONS
(Corresponding to approx. 40% of yield strength on dry steel surfaces)
Nominal bolt
diameter (In.)
½
⅝
¾
⅞
1
1⅛
1¼
1⅜
1½
1⅝
1¾
1⅞
2
2¼
2½
2¾
3
3¼
3½
Valve verification before start up
1. If the valve has been stored for a long time, check the bolt torque for bolting in accordance
with Table 1.
IMPORTANT
If piping system is pressurized with water for testing, and in case the piping system has been shut down
after testing for a long time, the following recommendations should be adopted.
a. Use corrosion inhibitor with water to pressurize the piping system
b. After testing, the piping system should be depressurized and the test water completely drained.
TROUBLESHOOTING GUIDE
Symptom
Body-Bonnet leaking
Valve leaking
Materials: A193 B7 / A193 B16 / A320 L7
Torque
Torque
Kgm
Ftlb
9
66
18
129
31
224
50
358
74
533
107
772
149
1075
201
1447
263
1896
339
2445
426
3072
527
3798
642
4630
921
6640
1271
9162
1537
11085
2003
14447
2556
18428
3201
23079
Possible cause
1. Body-bonnet flange gasket bolting loose
2. Gasket damaged
1. Valve not fully closed
2. Debris trapped in valve
3. Sealing surface damaged
Torque
Torque
Nm
Kgm
90
3
175
5
305
9
487
14
725
21
1050
31
1462
43
1968
57
2579
75
3325
97
4178
122
5165
150
6297
183
9030
263
12460
363
15076
439
19648
572
25062
730
31387
914
Material: A193 B8
Torque
Ftlb
19
37
64
102
152
221
307
413
542
699
878
1085
1323
1897
2618
3167
4128
5265
6594
Solution
1. Tighten bottom flange bolting
2. Replace gasket
1. Flush valve in order to close it
2. Cycle and flush (with valve open) to remove debris
3. Recondition the sealing surface
Torque
Nm
26
50
87
139
207
300
418
562
737
950
1194
1476
1799
2580
3560
4307
5614
7161
8968
4
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