4.7.31

40

9

21

17

22

Materials

No.

Part

1

Body

2

Seat

3

Bonnet

4

Cap

5

Disc

6

Spring

7

Upper adjusting

8

Lower adjusting

9

Stem (lower)

10

Stem (upper)

11

Spring washers (2 off)

12

Bonnet stud

13

Bonnet nut

14

Adjusting screw

15

Adjusting screw

16

Release ring

17

Lock-nut (2 off)

18

Lever

20

Cap set screw

21

Upper adjusting

22

Lower adjusting

23

Disc ball

24

Pin washer

25

Lever pin

26

Lock-nut

27

Guide plate

40

Stem pin

Material

Cast iron

Stainless

Cast iron

Cast iron

Stainless

Chrome-vanadium alloy steel

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Steel

Steel

Steel

Stainless steel

Carbon steel

Carbon steel

Carbon steel

Grey iron

Carbon steel

Stainless steel

Stainless steel

Stainless steel

Carbon steel

Carbon steel

Carbon steel

Carbon steel

Carbon steel

SV73 Cast Iron Safety Valve

ASTM A126 Class B

ASTM A351 Grade CF8

ASTM A126 Class B

ASTM A126 Class B

ASTM A217 CA15

ASTM A351 Grade CF8

ASTM A351 Grade CF8

ASTM A479 Type 410

ASTM A479 Type 410

ASTM A105

ASTM A193 Grade B7

ASTM A194 Grade 2H

ASTM A479 Type 410

26

16

18

4

24, 25

14

15

20

6

3

10

12

13

11

27

5

7

23

8

2

1

ring

ring

nut

ring pin

ring pin

Control valves

Safety valves

Page 2 of 5

Page 2 of 5

steel

steel

TI-S13-25 CH Issue 11