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6
11. LUBRICANT
The valves are already lubricated during the
assembly phase for the following reasons:
-
ease the components assembly
-
improve maneuverability
-
ease the preservation in case of warehouse
storage;
The type of lubricant depends on the type of fluid and
pressure/temperature conditions. We suggest the using
of the following:
-
Natural gas, oil, hydrocarbon fluids: Molycote
Longterm W2 for seals and Molycote HSC plus
for threaded connections;
-
Oxygen: Solvay Fomblin oil or Dupont Krytox;
-
Food products: Vaseline or similar nontoxic
materials;
For special applications we suggest to require
information specifying in detail the type of fluid and the
operating conditions.
12. TIGHTENING TORQUES
12.1. Flanges bolts Tightening Torque
12.2. Stem tightening torque
There is not a value for stem tightening torque.
Nuts have to be screwed up to the end, then the plate
springs (Belleville washers) have to be released
unscrewing the nut ½ turn.
13. SUGGESTED SPARE PARTS
The suggested spare parts are usually:
-
Soft Rings seals (statics and dynamics);
-
Fire safe rings (Graphite rings);
-
Metal seal rings;
-
Ball seats
When ordering the spare parts, list:
-
Type of valve;
-
Serial no;
-
Year of manufacture;
-
Type of fluid used;
-
Part no. (position);
-
Quantity
Other parts such as plugs, bleeders, stems, bonnets etc.
are available upon request.
Thread
in
Torque N/m
A193 B8 -
B8M CL.1
A193 B8M
CL.2
A193 B7
A320 L7
1/4
9
13
14
5/16
18
26
29
3/8
31
46
52
7/16
50
74
83
1/2
76
112
127
9/16
109
162
183
5/8
151
223
252
3/4
268
395
447
7/8
431
636
720
1 /0
646
954
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