44
Control systems Safety valves
Operating pressure/temperature limits Pressure Minimum set pressure
Temperature Body material
Specification
Max °C
21 bar g
Carb. steel
SA 216 Gr WCB
425
* Maximum set pressure
83 bar g
Alloy steel
SA 217 Gr WC9
538
Hydrostatic test pressure
1.5 x design pressure
*Alloy steel
SA 217 Gr WC9
538
* Based on SA 217 Gr WC9 alloy steel @ 538 °C (ASME B16.34 and ASME B16.5). The values depend on the pressure class of the valve inlet flange.
* Option available on request. Temperature limits based on ASME B16.34 and ASME B16.5 standards
Materials
Nº
Part
Material
Nº
Part
Material
23
Nut
SA 194 Gr 2H
up to 425 °C SA 216 Gr WCB
1
Body
24
Adjustment Screw
Stainless Steel
426 °C to 538 °C SA 217 Gr WC9
25
2
Lock Nut
Stainless Steel
Pipe plug
Carbon Steel
4.7 62
27
3
Lever Disc
Carbon Steel
Lower Locking Screw.
Stainless Steel
28
4
Cotter pin
Carbon Steel
Upper Locking Screw.
Stainless Steel
29
5
Hood
ASTM A 216 Gr WCB
Stud
SA 193 Gr B7
30
6
Screw
ASTM A 193 Gr B7
Nozzle
Stainless Steel T 316
33
7
Lever
Carbon Steel
Lower Adjustment Ring.
Stainless Steel T 316
34
8
Fork
Carbon Steel
Upper Adjustment Ring.
Stainless Steel T 316
38
Washer
Carbon Steel
Hardened Stainless Steel (17-4-PH)
up to 425 °C
9
Disc
39
Pin
Carbon Steel
426 °C to 538 °C Inconel
40
Cotter pin
Carbon Steel
up to 425 °C Stainless Steel T 316
44
Screw Cap
Carbon Steel
12
Disk Holder
426 °C to 538 °C Monel
45
Test Gag
Carbon Steel
up to 425 °C Stainless Steel T 316
46
Nameplate
Stainless Steel
17
Guide
426 °C to 538 °C Monel
47
Seal
Plastic / Lead
19
Stem
Stainless Steel
until 425 °C
Inox T 302
Retaining ring
57
20
Spring Washer
Carbon Steel
426 °C to 538 °C Inconel
up to 230 °C Carbon Steel
** Other materials on request
High Temperature Alloy Steel
21
Spring
231 °C to 400 °C
400 °C to 538 °C Inconel
22
Bonnet
SA 216 Gr WCB
TI-P276-01 CTLS Issue 1
Page 2 of 15
SV66H Safety Valve
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