Control systems Safety valves
4
Materials
4
6 3
10
11 12 13
9
4.7 107
7 5
8
2
1
No.
Part
Material
1
Body
Carbon steel
ASME SA 216 Gr. WCB
F to H orifice
Stainless steel
ASTM A182/A182M-18 F6A Class 3
2
Seat
J to R orifice
Stainless steel
ASTM A351 Grade CF8
3 4
Bonnet
Carbon steel
ASME SA 216 Gr. WCB
Cap
Cast iron
ASTM A126 Class B
F to H orifice
Stainless steel
ASTM A182/A182M-18 F6A Class 3
5
Disc
J to R orifice
Stainless steel
ASTM A217 CA15
6 7 8 9
Spring
Chrome-vanadium alloy steel
Upper adjusting ring
Stainless steel
ASTM A351 Grade CF8
Lower adjusting ring
Stainless steel
ASTM A351 Grade CF8
Stem (lower)
Stainless steel
ASTM A182/A182M-18 F6A Class 3
10
Stem (upper)
Stainless steel
ASTM A479 Type 410
11
Spring washers (2 off)
Steel
ASTM A105
12 13
Bonnet stud
Steel
ASTM A193 Grade B7
Bonnet nut
Steel
ASTM A194 Grade 2H
Materials continued on next page
TI-S13-30 CTLS Issue 16
Page 3 of 9
SV74 Carbon Steel Safety Valve
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