Valves Inlet Chart

Valves Inlet Connections - Taper Threads

Major Diameter Taper No of Thread of Small on Thread Angle End Diameter Per Inch (mm)

SN

Size

1a

1/2-14 NGT

20.716

Type 1, Size 1 of IS:3224 : 2002

1b

3/4-14 NGT

26.029

Type 1, Size 2 of IS:3224 : 2002

i)

3/4-14 NGT (CI)-1

26.029

Standard Size of Chlorine

ii)

3/4-14 NGT (CI)-2

26.484

iii)

3/4-14 NGT (7 turns oversize)

26.824

iv)

3/4-14 NGT (CI)-3

26.995

8-1/2 Turns Oversize

v)

3/4-14 NGT (CI)-4

27.617

14 Turns Oversize

vi)

3/4-14 NGT (CI)-5

29.204

28 Turns Oversize As per CGA V-1-2005

1c

1-11.1/2 NGT

32.593

Type 1, Size 3 of IS:3224 : 2002

i)

1-11.1/2 NGT (CI)-1

32.593

Standard size for Chlorine

ii)

1-11.1/2 NGT (CI)-2

33.144

4 Turns oversize for Chlorine

iii)

1-11.1/2 NGT (CI)-3

33.766

8-1/2 Turns oversize for Chlorine

iv)

1-11.1/2 NGT (CI)-4

34.524

14 Turns oversize for Chlorine

v)

1-11.1/2 NGT (CI)-5

36.45

28 Turns oversize for Chlorine

17.4

17E of ISO 111161 - 1 - 1999

2a

19.8 mm

4 Turns Oversize 1:16

1:16

3:25 2b

28.8 mm

25.8

Specifications

60o

60o 

55o

14

11.5

2nd Oversize Other than Chlorine

14 Type 2 of IS:3224 : 2002

Remarks

(CI) - 2 is first oversize for Chlorine and others gases (CI)-3, (CI)-4 and (CI)-5 are 2nd, 3rd and 4th oversize for Chlorine

As per CGA V-1-2005 and P-17 of Chlorine Institute

Also as per CGA-V-1-20 CGA-V-1-2005 05

As per P-17 of Chlorine Institute

i) ii)

Equivalent to :– 19.8 mm of Din 477-1:1990, ISO 11363-1:201 11363-1:2010 0

i) ii) iii) iv) v)

Equivalent to :– 25E of EN-629-1: EN-629-1:1996 1996 28.8 of Din 477-1:1990 25T of BS:341-1991 PZ 27.8 of GB 8335 ISO 11363-1:201 11363-1:2010 0

18 T of BS 341-1991 and 0.715" of AS 2473-1996

* 3a

18.16 mm

18.16

Type 4, Size 1 of IS:3224 : 2002

3b

25.4 mm

25.4

Type 4, Size 2 of IS:3224 : 2002

1" of AS 2473-1996

i)

26.194 mm (1-1/32")

26.194

3.5 turns oversize

1st oversize

14 1:8

55

ii)

26.987 mm (1-1/16")

26.987

7 turns oversize

2nd oversize

iii)

27.781 mm (1-3/32")

27.781

10.5 turns oversize

3rd oversize

iv)

28.574 mm (1-1/8")

28.575

14 turns oversize

4th oversize

* 3c

31.75 mm

31.75

11

Type 4, Size 3 of IS:3224 : 2002

32 T of BS 341-1991

4

1/8-27 NGT

9.984

27

5

1/4-18 NGT

13.253

6

3/8-18 NGT

16.672

60o

1:16

Also as per BS 341-1962

o

18

Inlet size for small fuse plugs

As per CGA V-1-2005

Generally for small refrigerant valves as per IS:12300-1998

* Oversize of 18.16 mm and 31.75 mm also available as per prov ision in Table 6 of IS:3224 : 2002 JIS Threads

SN

Size

Major Diameter of Large End (mm)

1

V1

21.2

2

V2

29.5

Taper on Diameter

V3

29.5

4

1.455"

40.3 (Approx)

No of Thread Per Inch

Specifications

As per JIS 8246:2004 55o

3:26 3

Thread Angle

Capacity

Remarks

≤51

Thread length 22 mm

≥51

Thread length 30 mm (For Cylinder TP > 9.8 MPa)

≥51

Thread length 26 mm (For Cylinder TP ≤9.8 MPa)

-

Thread length 29 mm

14 As per JIS 8244:1989

Valves Inlet Connections - Parallel Threads

SN

Size

1

3/4-16 UNF-2A

2

1.1/8-12 UNF-2A

3

M 18 x 1.5-6G

4

M25 x 2.0-6G

5

M30 x 2.0-6G

6

3/4-14 NGS - 2A

Thread Profile 60o Unified Thread 60o Metric Thread

60o Unified Thread

Major Diameter (mm)

Approx Length of Valve Stem (mm)

19.012 / 18.773

23

28.529 / 28.240

24

17.968 / 17.732

22-24

24.962 / 24.682

25-27

29.962 / 29.682

25-30

26.264 / 26.010

24

Specification

Remarks

JIS B 8246:2004

Also as per CGA V-1-2005

BS 341-1991

Also as per EN144-1:2000/A2:2005 and ISO 15245-1:2001

AS 2473-1996

Also as per CGA V-1-2005 and 3/4 14 NPSM as per JIS B 8246:2004