Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 7302 (1974): Valve Fittings for Gas Cylinder Valves forUse with Breathing Apparatus [MED 16: Gas Cylinders]

UDC 621.642.02 : 621.646.2 : 614.894.72 IS : 7302 - 1974

Indian Standard

SPECIFICATION FOR VALVE FITTINGS FOR GAS CYLINDER VALVES

, FOR USE WITH BREATHING APPARATUS

1. Scope - Dimensions and material requirements of valve fittings for gas cylinders used for breathing apparatus other than for medical purposes, and dimensions of the valve capsules. stems are covered.

Only valves with taper

2. Dimensions of Standard Taper Screw Threads on Valve Stems and in Cylinder Necks

2.1 Dimensions-See Fig. 1.

T r C

i

VALVE STEM CYLINDER NECK

AXIS OF SCREW ____-__-_-.-_---

/TAPER ON DIAMETER

(See 2.2)

FIG. 1 WHITWORTH FORM THREAD; RIGHT HAND, NORMAL TO SURFACE OF CONE

Adopted 22 February 1974 0 September 1974, ISI

INDIAN STANDARDS INSTITUTION MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110001

IS : 7302 -1974

2.2 Main Dimensions - See also Fig. 1.

All dimensions in millimetres.

-

--

-_

. -

__

--

-

-

-_

. _

. _

._

-

-

I _

_ .

. _

.-

.

-

Taper

D”&

~-

(2)

Length

Th::ad B

Length of Thread in

Yzi? D

Min

--

(8)

22.23

22.23

25.40

Pitch Measured

Along Cone

(3)

Cylinder Major

Dia C

Min

(6)

Length? of Engagement (w;t”,“,v;;ve

Screwed DowGiight)

--

(7)

15.88

15.88

19.05

25.40

Nominal Size of Valve*

(1)

Stem MD”ii,“r

A Max

(4) (5)

15.240 15.24 1 : 5.625 I.814

18.16 I:8 1.814

19,202

20.142 18.160 22.23+3.17 -0

25.40 I:8 I.814 25.400 25’405Y17 27.788

31.75 1 :8 2.309 31.750 34.925

*Represents the maximum major diameter at the small end of the valve stem.

?Cylinders in service may have oversize threads on the valve stems provided this minimum length of engagement of thread is maintained.

2.3 Limits*

All dimensions in millimetres.

Diameter of Thread on Valve Diameter of Thread at Stem at Small End, A Mouth of Cylinder, C

Nominal Size of Valve

Thread Element

Max Min Min

(2)

Major diameter

Pitch diameter

Minor diameter

(3) (4)

Max --

(5) (6)

15.240 15.037 19.472

14.079 13.958 18.158

12.918 12,664 12.664

Major diameter 18.160 17,958 20.414

Pitch diameter 16.998 16.863 19.114

Minor diameter 15.834 15,563 18,019

19.192

18.032

16.871

~-

20.142

18.979

17.816

Major diameter 25.400 25.197 28.059 27.788

Pitch diameter 24.237 24.102 26.759 26.624

Minor diameter 23.073 22.802 25.664 25.461

Major diameter 31.750 31.483 35.281 34.925

Pitch diameter 30.269 30.091 33.622 33.444

Minor diameter 28.788 28.433 32.230 31.963

(1)

15.24

18.16

25.40

31.75

*Recommended limit gauges for controlling the screw threads between these diametral limits are covered in IS : 7202-l 974 ‘Specification for inspection gauges for checking threads of gascylinder valves for use with breathing apparatus.

2

IS : 7302 -1974

3. Dimensions and Tolerances of Valve Outlets and Connectors

3.1 FP Q Right Hand Internal Outlet Connection with l-81 4 mm Pitch, Out/et Type A

M --iCi--A-i

VALVE OUTLET CONNECTOR WHEEL SCREW

Valve Outlet

Threads (parallel) INT-FP #xI.814-RH* (also called BSP g)

Major diameter (Min)

Pitch diameter

22.911

21.891

21.746

Minor diameter 21 .I 28

20.587

Depth of thread recess A 15.34

14.83

Diameter of recess D 12.70

12.83

Depth of recess C 3.56

Diameter E 30.40

2990

DETAlL A

Recess diameter

Recess diameter

Recess depth P

Recess radius Q

Recess radius S

Recess radius R

All dimensions in millimetres.

Connector - -

Nose diameter G 11.94

11.81

Nose length N 3.18

Shoulder diameter F 20.07

19.94

Shoulder length 5 5.00

449

Shank diameter H 15.75

15.62

T 9.65

9.40

M 18.42

18.29

2.03

ix)

0.89

064

1.47

1.34

0.25

0.13

Wheel Screw

Threads INT-FP#-RH*

Minor diameter, Max

Pitch diameter

20,587

21.746

21,607

Major diameter

Hole diameter K

Length of thread J

22.911 22.627

16.00

15.87

9.78

9.27

Undercut L 3.18

Note- Dimensions for connector and wheel screw are for guidance purposes only.

*Threads conforming to IS: 2643-1964 ‘Dimensions for pipe threads for fastening purposes’, with class A tolerance. Designation of threads corresponds to that of Table 4 of IS : 3224-l 971 ‘Specification for valve fittings for compressed gas cylinders (first revision)‘.

3

IS : 7302 - 1974

3.2 Whitworth 17% x1-814 Right Hand Internal Outlet Connection, Outlet Type B

ASSEMBLY

VALVE OUTLET WASHER

WASHER RETAINER CONNECTOR WHEEL NUT CONNECTOR

All dimensions in millimetres.

Valve Outlet Connector Wheel Nut -

Threads (parallel) INT-W 17.5 x 1.814-RH* Nose diameter L (also called BSF$$)

Nose length H

Minor diameter 15.682

15.141

Shoulder diameter P

Pitch diameter 16444 -- 16’302 Shank diameter J

Shank length Z

Major diameter (A&%) 17.462 Washer

Full thread T 28.58 Diameter G

Thickness M

11 .lO Thread INT-W 17.5x1.814-RH

15.08 17.419 Major diameter -

17.208

14.30 16.258 Pitch diameter -

16.116

IO.72

32.16 Minor diameter (Max) 15.098

Hole diameter R 1140

15.08 Full thread W 12.70 (Afin)

3.18 Length II 31.75

Washer Retainer

External thread D w 17.5x 1.814-RH

Hole diameter C 11.91

Length Y 7.14

-

Note 1 - Dimensions for connector and wheel nut are for guidance purposes only.

Note 2 - It is recommended that a form of locking attachment be fitted to prevent the nose piece unscrewing from the connector.

*Designation of threads corresponds to that of Table 4 of IS : 3224-1971.

4

IS : 7302 - 1974

3.3 FP a Right Hand External Outlet Connection with I.337 mm Pitch, Outlet Type C

* ASSEMBLV

VALVE OUTLET CONED SEATING

SOFT STEEL WIRE RING

All dimensions in millimetres.

CHAMFER So” TO

/KF~PTH OF THREAD

l---V--l

HEXAGON NUT

Valve Outlet Coned Seating Hexagon Nut

Threads (parallel) EXT-FP &xl .337-RH* (also called 8SP 4) Outside diameter A

11 .I 8 Threads EXT-FP )-RH* - II.05

Minor diameter (Max) 11.445 Cone diameter 8 8.20 m Minor diameter

11990

11,445

Pitch diameter 12.301 8.46 12.426

I 12.176

Shank diameter D 833

Pitch diameter 12.301

Major diameter

Full thread T

13.157

12.907 Shank radius G 0.79 Major diameter (&fin) 13.157

12.70 Distance H 4.65

ZziI Hole diameter R

11.56

11.46

Cone diameter C 9.58

9.45 Length full thread V

Thread ring recess W

Ring recess diameter X

19.05

12.31

15.32 - 15.19

Width Y 3.63

3.55

Width across flats S 18.03 - 17.90

Nota - Dimensions for hexagon nut and coned seating are given for guidance purposes only.

*Threads conforming to IS : 2643-1964 with class A tolerance. Table 4 of IS : 3224-1971.

Designation of threads corresponds to that of

5

IS : 7302 -1974

3.4 FP # Right Hand External Outlet Connection, Outlet Type D

&OULDED RUBBER GRIP

ASSEMBLY

TOROIOAL SOFT STEEL

VALVE OUTLET CONED SEATING HANDWHEEL

Valve Outlet

All dimensions in millimetres.

Coned Seating I Handwheel

fhreads (parallel) EXT-FP #x1,814-RH* (also called BSP 3) Barrel diameter Q

II.20 Thread EXT-FP #-RH* - IO.95

21 .I 28

Vlinor diameter (&fax) 20.587 Shank diameter P 8.46 Minor diameter

833 %izzi

>itch diameter 21.746 21.607 Pitch diameter

21.891

Recess diameter R 4.75 21.746

Major diameter 22.911 Major diameter (Min) 22.911

22.627 Shank radius S 1.59

‘ull thread T II.11 0.25 Full thread H

Recess radius U 12.70

zone diameter C 9.52 0’13 Wheel diameter G 28.58

zone depth B 9.52 Overall length V 12.83 Wheel diameter F 34.93

12.65 Length J 22.22

I qecess diameter A II.56 - Recess length X

2.06 Length K 114.29

II.46 ~ 1 .93

Recess width L 3.63

Recess depth D 4.78

Nose length Y 3.30

3.55

465 zi?

Recess diameter N 15.32 - 15.19

Cone length Z 5.61 548 Hole diameter M

II.56 11.43

Note - Dimensions for handwheel and coned seating are given for guidance purposes only.

*Threads conforming to IS : 2643-1964 with class A tolerance. Table 4 of IS : 3224-1971.

Designation of threads corresponds to that of

l-

6

IS : 7302 -1974

3.5 Yoke Type Flush Outlet Connection, Outlet Type E

I I I i ASSEMBLY

-

i-

* 0 VIEW X

B

VALVE OUTLET WASHER YOKE CONNECTOR

All dimensions in miliimetres.

Valve Outlet Washer Yoke Connector

Body size A 23.04 21.41

Diameter G Stem diameter K

Recess diameter D 18.34 IiF@

Hole diameter F 11.96 Il.83

Nose diameter T

Recess depth B 3.18 33

Thickness M 2.38 Nose length P

Spigot diameter E 11.94 iixi

Recess diameter S

Spigot length Q 1.70 i?F5

Recess width R

Countersink C 150” x 7.92 diameter Spigot diameter L

30.28 3003

30.56 ZFff

14.40 14.15

26.26 26.11

7.62 F?zr

17.53 fz%

Spigot length H 2.08

m

7

IS : 730211974

4. Materials - Shall be compatible with the gas to be contained in the cylinder. Actual composition shall be as agreed to between the purchaser and the manufacturer.

Valve body shall not be a casting.

5. Mechanical Properties and Test Samples of Material

5.1 Tensile Strength and Elongation - Minimum 40 kgf/mmz and 18 percent respectively determined according to IS : 1608-I 972 ‘Method for tensile testing of steel products (first revision)‘, IS : 1816-l 961 ‘Method for tensile test for light metals and their alloys’, and IS : 2654-l 964 ‘Method for tensile testing of copper and copper alloys’.

5.2 Impact Strength - Minimum 5.6 kgf.m for steel, 2.2 kgf.m for brass or manganese bronze or aluminium bronze.

5.3 Test Samples - Shall be taken from a valve blank, where practicable. Where not practicable, test piece shall be subjected to same treatment as the valve so as to be representative of the material in the condition in which it has to be used. The scale of sampling and criteria for conformity shall be in accor- dance with the requirements of Appendix A, unless otherwise agreed to between the manufacturer and the purchaser.

6. Valving Capsules

6.1 Genera/ - This is a tapered sleeve fitted between the taper threaded portion of the cylinder valve and the internally threaded portion of cylinder neck to ensure a gastight joint when the valve is screwed home. Material of construction shall be any soft metal compatible with the gas to be contained in the cylinder. A torque limiting device must be used.

6.2 Dimensions

All dimensions in millimetres.

Nominal Size

15.24 19.20 15.24 22.23 0.13

18.16 20.93 18.16 22.23 0.13

25.40 28.17 25.40 22.23 0.13

31.75 34.92 31.75 25.40 0.13

Inside Diameter at Inside Diameter at Large End Small End

Length Approximate Thickness

7. General Machining Tolerances- Medium grade of IS : 2102-1962 ‘Allowable deviations for dimensions without specified tolerances (first revision)‘.

8. Pneumatic Testing - Each valve from the production batch shall be subject to a pneumatic proof test at a pressure consistent with its intended maximum permissible working pressure.

9. Safety Requirements -All valve spindles relying for their retention under pressure on a suitable thread shall have, in addition, a second means of retention to safeguard against the spindle being ejected with high velocity thereby endangering life.

10. Marking -The following shall be permanently marked on the valve:

a) Year of manufacture,

b). Manufacturer’s identification,

c) Number of this standard, and

d) Maximum working pressure in kgf/cm2.

10.1 ISI Certification Marking - Details available with the Indian Standards Institution.

IS : 7302 - 1974

APPENDIX A (Clause 5.3)

SAMPLING SCHEME FOR EVALUATION OF MECHANICAL PROPERTIES OF THE VALVE MATERIAL

A-l. Scale of Sampling

A-l .I Lot - In any consignment, all the valve blanks of the same material and size and manufactured under similar processes of production shall constitute a lot.

A-l .2 Valve blanks shall be selected and examined for each lot separately for ascertaining their conformity to the requirements of mechanical properties.

A-l.3 The valve blank samples shall be selected at random according to the following scheme:

Number of Valve Blanks

I Number of Samples to bo

in the Lot Drawn from the Lot

up to 500 4 501 ,, 800 8 801 ,, 1 300 12

1 301 ,, 3200 16 3 201 , 7 500 20

A-l .4 The selected valve blank samples shall be divided into two equal halves. The tensile and elonga- tion tests shall be carried out on all samples of the first half and the izod impact test on the second half.

A-2. Criteria for Conformity

A-2.1 For Tensile and Elongation Test (see 5.1) -All the samples of the first half shall be examined for tensile and elongation test. The lot shall be declared as satisfactory with respect to the requirements of tensile and elongation test if each sample passes the test satisfactorily.

A-2.2 For lzod Impact Test (see 5.2) -All the samples of the second half shall be examined for izod impact test. The lot shall be declared as satisfactory with respect to the requirements of the izod impact test if each valve material passes the test satisfactorily.

A-2.3 The lot shall be declared as conforming to the requirements of mechanical properties if it has been found satisfactory according to A-2.1 and A-2.2.

EXPLANATORY NOTE

In the preparation of this standard assistance has been derived from BS 341 : Part 2: 1963 Speci- fication for valve fittings for compressed gas cylinders, Part 2 Valves with taper stems for use with breathing apparatus.

The quantities in this standard have been expressed in technical metric units. However, in view of the introduction of International System (SI) units in the country, the relevant SI units and the corres- ponding conversion factors are given below for guidance:

Pressure - 1 kgf/cm2 =98.066 5 kPa (kilopascal) =0.980 665 bar

Stress - 1 kgf/mmz =9*806 65 N/mm2 (newton per square millimetre)

Impact Strength - 1 kgf.m/cm2=9*806 65 J/cm2 (joules per square centimetre)

9

Printed at Sree Saraswaty Press Limited, Calcutta, India