Control systems Safety valves
4
Materials
No.
Part
Material
4
ASTM A126 Class B ASTM A351 Grade CF8 ASTM A126 Class B ASTM A126 Class B ASTM A217 CA15
26 16
1
Body
Cast iron
24, 25
2
Seat
Stainless steel
14 15 20
3
Bonnet
Cast iron
18
4
Cap
Cast iron
5
Disc
Stainless steel
6
6
Spring
Chrome-vanadium alloy steel
ASTM A351 Grade CF8 ASTM A351 Grade CF8
3
7
Upper adjusting ring
Stainless steel
10
8
Lower adjusting ring
Stainless steel
12 13 11 27
ASTM A182/ A182M-18 F6A Class 3
9
Stem (lower)
Stainless steel
4.7 99
40 9 21 17 22
ASTM A479 Type 410
10
Stem (upper)
Stainless steel
7 5
11
Spring washers (2 off)
Steel
ASTM A105
ASTM A193 Grade B7 ASTM A194 Grade 2H ASTM A479 Type 410
12
Bonnet stud
Steel
23 8
13
Bonnet nut
Steel
2
14
Adjusting screw
Stainless steel
15
Adjusting screw nut
Carbon steel
1
16
Release ring
Carbon steel
17
Lock-nut (2 off)
Carbon steel
18
Lever
Grey iron
27
5
20
Cap set screw
Carbon steel
21
Upper adjusting ring pin Stainless steel
22
Lower adjusting ring pin Stainless steel
40
23
Disc ball
Stainless steel
9
24
Pin washer
Carbon steel
7
25
Lever pin
Carbon steel
21
26
Lock-nut
Carbon steel
17
27
Guide plate
Carbon steel
40
Stem pin
Carbon steel
22
23
8
TI-S13-25 CTLS Issue 12
Page 3 of 8
SV73 Cast Iron Safety Valve
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