8.2 MAIN VALVE RE-ASSEMBLY
8.2.1 PROCEDURE
• Parts to be assembled should be absolutely clean, degreased and dried.
• We recommend greasing all thread and contacting parts except guiding piston/guide and
• seat between nozzle and disc. Use grease according to service (oxygen, food…)
• When using a soft good kits,: do not keep old parts if new are available. Change them.
• Proceed in the opposite of disassemble (see figures chapter 8.1)
• Take care of gaskets with lips (spring in direction of pressure), piston rings, pipes and flexible.Grease all the O-rings.
• At the end, slide the cover (2) on its studs (35) until it reaches the guide (9). It is necessary to
use a torque wrench to tighten the cover bolting. Tighten to 30% of the nominal torque (figures and table bellow)
Continue to tighten alternatively until the required torque is reached (in 3 or 4 steps).
Nominal diameter
(mm)
Core section
(mm
2
)
Allowable stress (M.Pa)
Tightening torque (m.daN)
Carbon steel
Stainless steel
Carbon steel
Stainless steel
10
52.3
172
152
1.7
1.5
12
76.2
172
152
3.0
2.6
14
105
172
152
4.7
4.2
16
144
172
152
7.2
6.4
18
175
172
152
10.0
8.8
20
225
172
152
14.1
12.5
22
281
172
138
19.1
15.3
24
324
172
138
24.4
19.6
27
427
172
113
36.0
23.7
30
519
172
113
49.0
32.2
33
647
172
113
66.5
43.7
36
759
172
88
85.6
43.8
39
913
172
88
111.2
56.9
NOMINAL TIGHTENING TORQUE
78 SERIE SAFETY RELIEF VALVE
SARASIN-RSBD
™
26
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