Recommended Body Bolt Torque Values - Flowserve Valtek Mark 100 User Instructions

Valtek ® Control Products Mark 100
5. Make sure the valve fails in the correct direction in case
of air failure. This is done by turning off the air supply and
observing the failure direction.
6. After a temperature excursion has occurred, bonnet flange
bolting should be retorqued to ensure bonnet gaskets do
not leak. See Table 2.
Table 2: Recommended body bolt torque values
Bolt Size
(in)
⁄
7
8
1
1 ⁄
1
8
11/4
1 ⁄
3
8
11/2
1 ⁄
5
8
1 ⁄
3
4
1 ⁄
7
8
2
2 ⁄
1
4
2 ⁄
1
2
Table 3: Common packing lubricants
Lubricant Manufacturer
Krytox 206 E.I. DuPont
GP 460 Graphite Products Co.
Aeroshell Grease 7 Shell Oil Co.
Garlock Luball Garlock Inc.
VAIOM000103-02 (EN/AQ) March 2020
and Mark 100SC Control Valves
™
B7 Studs, 2H Nuts
ft-lb
230
350
510
730
1,000
1,320
1,710
2,170
2,700
3,350
4,050
4,850
Temperature Range
-20°C to 285°C
(-5°F to 550°F)
0°C to 540°C
(32°F to 1,000°F)
-75°C to 150°C
(-100°F to 300°F)
0°C to 260°C
(32°F to 500°F)
Bolt/Stud Material
N m
312
474
691
990
1,356
1,790
2,318 1,080
2,942 1,400
3,660 1,700
4,542 2,100
5,491 2,530
6,575 3,010
Applications, Description
Fluorinated general purpose grease; handles common liquids and
gases; good lubricity in harsh mediums; nonflammable, chemically
inert; will not harm plastic or metal parts
Graphite in petrolatum; high pressures; anti-galling, graphite remains
above 316°C (600°F)
Synthetic oil-based; low-temperature applications
General purpose molybdenum disulfide lubricant economical; good
in water, steam and common chemicals; not good in harsh mediums
where Krytox 206 is recommended
B8 Studs and Nuts
ft-lb N m
150 203
220 298
330 447
460 624
630 854
840 1,139
1,464
1,898
2,305
2,847
3,430
4,081
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