Bsi bs en 00850 1997 (2001)

BRITISH STANDARD

Transportable gas cylinders Ð
Pin-index, yoke-type valve
outlet connections for
medical use

The European Standard EN 850 : 1996, with the incorporation of amendment
A1:2000 has the status of a British Standard

ICS 23.020.30

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

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BS EN 850 : 1997

Committees responsible for this
British Standard
The preparation of this British Standard was entrusted to Technical Committee
PVE/3, Gas containers, upon which the following bodies were represented:

Aluminium Extruders' Association
Aluminium Federation
British Compressed Gases Association
British Fire Consortium
British Gas plc
British Iron and Steel Producers' Association
British Soft Drinks Association Ltd.
Engineering Equipment and Materials Users' Association
Fire Extinguishing Trades' Association
Health and Safety Executive
Home Office
Institution of Chemical Engineers
LP Gas Association
Marine Safety Agency
Ministry of Defence
National Engineering Laboratory
National Physical Laboratory
Safety Assessment Federation Ltd.
Safety Equipment Association
Tube Investments Chesterfield Tube Co. Ltd.
Tubes Investments Limited
The following bodies were also represented in the drafting of the standard, through
subcommittees and panels:

This British Standard, having
been prepared under the
direction of the Engineering
Sector Board, was published
under the authority of the
Standards Board and comes into

effect on
15 March 1997
 BSI 05-2001

The following BSI references
relate to the work on this
standard:
Committee reference PVE/3
Draft for comment 92/81293 DC
ISBN 0 580 26778 4

Association of British Oceanological Industries Ltd.
British Association of Breathing Apparatus Service Engineers
British Sub-Aqua Club
Department of Health
International Marine Contractors' Association
Natural Gas Vehicle Association

Amendments issued since publication
Amd. No.

Date

Comments

10097

July 1998

See national foreword

13044

May 2001

Indicated by a sideline


BS EN 850 : 1997

Contents

Committees responsible
National foreword
Foreword
Text of EN 850

 BSI 05-2001

Page
Inside front cover
ii
2
3

i


BS EN 850 : 1997

National foreword
This British Standard has been prepared by Technical Committee PVE/3 and is the
English language version of EN 850 : 1996 Transportable gas cylinders Ð Pin-index,
yoke-type valve outlet connections for medical use, including amendment A1:2000,
published by the European Committee for Standardization (CEN). Amendment No. 1 to
BS EN 850 : 1997 replaced Table 3 and was published as a CEN corrigendum in
April 1998.
EN 850 was produced as a result of international discussions in which the United
Kingdom took an active part.
This British Standard supersedes BS 1319 : 1976 and BS 1319C : 1976 which are
withdrawn.
The Technical Committee has reviewed the provisions of ISO 32 to which normative
reference is made in the text, and has decided that they are acceptable for use in
conjunction with this standard.
Cross-references
Attention is drawn to the fact that CEN and CENELEC Standards normally include an
annex which lists normative references to international publications with their
corresponding European publications. The British Standards which implement these
international or European publications may be found in the BSI Standards Catalogue
under the section entitled ªInternational Standards Correspondence Indexº, or by using
the ªFindº facility of the BSI Standards Electronic Catalogue.
A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.

Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii, the
EN title page, pages 2 to 25 and a back cover.
The BSI copyright notice displayed in this document indicates when the document was

last issued.
Sidelining in this document indicates the most recent changes by amendment.

ii

 BSI 05-2001


EUROPEAN STANDARD
NORME EUROPÊENNE

EN 850

EUROPẰISCHE NORM

+A1

July 1996

November 2000
ICS 23.020.30

Incorporates corrigendum April 1998

Descriptors: Gas cylinders, medical equipment, medical gases, gas mixtures, gas valves, pipe fittings, valve yokes, safety devices, catches,
equipment specifications, dimensions

English version

Transportable gas cylinders Ð Pin-index, yoke-type valve outlet

connections for medical use
(includes amendment A1:2000)

Bouteilles aÁ gaz transportables Ð Raccords de
sortie de robinets du type aÁ eÂtrier avec ergots de
seÂcurite pour usage meÂdical
(inclut l'amendment A1:2000)

Ortsbewegliche Gasflaschen Ð Ventilseitenstutzen
mit AnschluÈûbuÈgel nach dem Pin-index-System fuÈr
medizinische Anwendung
(enthaÈlt AÈnderung A1:2000)

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ

This European Standard was approved by CEN on 1996-02-16. Amendment A1:2000
was approved by CEN on 2000-10-20. CEN members are bound to comply with the
CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards
may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a
CEN member into its own language and notified to the Central Secretariat has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

CEN

European Committee for Standardization
Comite EuropeÂen de Normalisation
EuropaÈisches Komitee fuÈr Normung
Central Secretariat: rue de Stassart 36, B-1050 Brussels
 CEN 1997 Copyright reserved to CEN members
Ref. No. EN 850 : 1996 +A1:2000 E


Page 2
EN 850 : 1996

Foreword
This European Standard has been prepared by
Technical Committee CEN/TC 23, Transportable gas
cylinders, the secretariat of which is held by BSI.
ISO 407 : 1991 was used as the base document.
This European Standard shall be given the status of a
national standard, either by publication of an identical
text or by endorsement, at the latest by January 1997,
and conflicting national standards shall be withdrawn
at the latest by January 1997.
According to the CEN/CENELEC Internal Regulations,
the national standards organizations of the following
countries are bound to implement this European
Standard: Austria, Belgium, Denmark, Finland, France,
Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.

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Contents
Foreword
1
Scope
2
Normative references
3
Valve
4
Yoke
5
Basic dimensions
6

Requirements for alternative designs
of pin-index, yoke-type valve
connections
7
Positions of holes and pins for
pin-index, yoke-type valve connections

Page
2
3
3
3
4
4

7
11

Foreword to amendment A1
This amendment EN 850:1996/A1:2000 to the
EN 850:1996 has been prepared by Technical
Committee CEN/TC 23, Transportable gas cylinders, the
Secretariat of which is held by BSI.
This European Standard shall be given the status of a
national standard, either by publication of an identical
text or by endorsement, at the latest by May 2001, and
conflicting national standards shall be withdrawn at
the latest by May 2001.
According to the CEN/CENELEC Internal Regulations,
the national standards organizations of the following

countries are bound to implement this European
Standard: Austria, Belgium, Czech Republic, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland,
Italy, Luxembourg, Netherlands, Norway, Portugal,
Spain, Sweden, Switzerland and the United Kingdom.

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ

 BSI 05-2001


Page 3
EN 850 : 1996

1 Scope

Table 1. Allocated gases and gas mixtures

This European Standard applies to pin-index, yoke-type
valve outlet connections for medical use, up to a
maximum working pressure of 250 bar at 15 ÊC.
These connections are for use with medical gas
cylinders of water capacity below 5 L, for patient care,
including therapeutic, diagnostic and prophylactic
applications, in hospitals and for emergency treatment.
It specifies:
± basic dimensions;
± requirements for alternative designs of pin-index,
yoke-type valve connections;
± dimension and positions for the holes and pins for

the outlet connections for certain gases and gas
mixtures.

Gas or gas mixture

Chemical
symbol

Outlet
connection
figure
number

Oxygen
Oxygen/carbon dioxide
(CO2 # 7%)
Oxygen/helium
(He # 80 %)
Ethylene
Nitrous oxide (liquid draw
off)
Nitrous oxide (gas draw
off)

O2
O2 + CO2

9
10

O2 + He

11

C2H4
N2O

12
table 3

N2O

13

Cyclopropane

C3H6

14

Helium and
helium/oxygen
(O2 < 20 %)

He
He + O2

15

Carbon dioxide (liquid

draw-off)

CO2

table 3

2 Normative references
This European Standard incorporates by dated or
undated reference, provisions from other publications.
These normative references are cited at the
appropriate places in the text and the publications are
listed hereafter. For dated references, subsequent
amendments to or revisions of any of these
publications apply to this European Standard only
when incorporated in it by amendment or revision. For
undated references the latest edition of the publication
referred to applies.

Carbon dioxide (gas draw CO2
CO2 + O2
off) and carbon
dioxide/oxygen
(CO2 > 7 %)

16

Medical air

17

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ

IS0 32

Gas cylinders for medical use Ð Marking
for identification of cylinder content

Air

Nominal mixture 50 %
O2 + N2O
oxygen/50 % nitrous oxide
(47,5 % < N2O < 52,5 %)

8

3 Valve

Nitrogen

18

Basic dimensions of yoke-type, pin-index valve bodies,
are given in clause 5. Dimensions and positions of
location holes and pins are given in clause 7.
The name or chemical symbol of the gas or gas
mixture shall be clearly and indelibly marked on the
valve.
Table 1 lists the allocated gases and gas mixtures, the
chemical symbols and the corresponding outlet

connection figure numbers.

Mixture of air, helium and Air +He + CO table 3
carbon monoxide
(CO < 1 %)

 BSI 05-2001

N2


Page 4
EN 850 : 1996

4 Yoke

5 Basic dimensions

The connecting yoke shall conform to the dimensions
and requirements given in clauses 5 and 6. The yoke
shall be fitted with pins, the dimensions and the
positions of which corresponds to the holes in the
valve, as indicated in clause 7, for the appropriate gas
or gas mixture.
The name or chemical symbol of the gas or gas
mixture shall be clearly and indelibly marked on the
yoke (see table 1). If an identification colour is used, it
shall be in conformity with IS0 32.
Examples of alternative designs, for the connecting
yoke, are given in 6.2.

The basic requirements for pin-index, yoke-type valve
connections are shown in figure 1. Figures 2, 3 and 4
show alternative pin arrangements. Table 2 gives the
necessary dimensions.
Table 2. Basic dimensions for pin-index,
yoke-type valve connections
Symbol

Dimension
mm

Symbol

Dimension
mm

a

25

e

0,8 max

b

22,2 +0,4
0

f

0,8 max

c

16 min

g

D

7

h 2)

1,6 ± 0,4
20 ± 0,5

D1

2,4 ± 0,8

k

16,5 min

D2

4,75

11

44,5 min

D3

5,8 to 5,9

12

22 min

D4

6,3

13 3)

8 min

D5

6

14 3)

9,6 max

D6 1)

7 min

15

5,5+0,5
0

d

6,5

16

0
5,520,5

d1

4 ± 0,1

17

3 to 3,6

d2

5,4

18

15 min

d3

16 ± 0,5
9 ± 0,2

r

14,3 ± 0,07

r1

12 nom

r2

17,5 nom

+0,8
20,2

+0,2
0

+0,1
0

0

20,2

0
20,5

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ

d4

0
20,2

0
20,1

1)

D6 is the dimension at the top of the yoke clamping screw
cone.
2) For h, q and q see clauses 5 and 6. As an alternative, these
1
dimensions may be given in order to satisfy the requirements of
6.1 g.
3) Applicable only if a projecting pressure relief device is used.

 BSI 05-2001


Page 5
EN 850 : 1996

0
Ø 9 -0,5

8 min.

0
5,5 - 0,1

ØD1

X

l

1

l

2

=

h

l

3

l

8

X

=

ØD

c

l

4

Pressure relief device

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ
Sealing washer

l

Detail of yoke
clamping screw

a

Section X-X
Dimensions in mm

Figure 1. Pin-index, yoke-type valve body and yoke

 BSI 05-2001

Ød

k

Ø D4

Ø d3

b

e
Ød 4

ØD5

120°
100°

120°
100°

ØD

6

t

g

Yoke

7


Ø D3

Ø D6

r

Ød 2

Page 6
EN 850 : 1996

l

l

6

5

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ

Figure 2. Pin-index, yoke-type valve connection Ð single pin

h

=

l

8

c

1

6

2

5

3

4

Ød 1

Ø D2

r

Ø D1

=

r

l

l

6

5

NOTE. Dimensional positions of holes and pins, numbered 1 to 6, are shown in figures 9 to 18.

Figure 3. Pin-index, yoke-type valve connection Ð two pins on a single arc

 BSI 05-2001


Page 7
EN 850 : 1996

r2

r1

E

B

D

F

J

Ød 1

A

Ø D2

C

l
G

6

One pin only is
shown for clarity

H

l

5

NOTE. Dimensional positions of holes and pins, identified by the letters A to J, are shown in table 3.

Figure 4. Pin-index, yoke-type valve connection Ð two pins on double arcs

6 Requirements for alternative designs of
pin-index, yoke-type valve connections
6.1 Requirements for the design of the
connecting yoke
The design of the connection shall meet the following
requirements:
a) a gas-tight seal shall only be possible when the
pins in the yoke match the corresponding holes in
the valve;
b) when the pins in the yoke do not correspond to
the holes in the valve, a gas-tight seal shall not be
possible and damage to the yoke, or the valve shall
be avoided;
c) pins shall be fixed or assembled in such a manner
that they cannot be removed by the user, or become
loose in service;
d) the sealing washer shall be a tight fit on the yoke
spigot;
e) the use of more than one sealing washer is not
permitted;

 BSI 05-2001

f) the yoke shall be able to resist, without permanent
deformation, the load resulting from a torque of
50 N´m applied to the clamping screw or closing
device;

g) the dimensions of the yoke shall be such as to
limit the movement of the yoke, respective to the
valve, to a maximum of 6Ê about the long axis of the
valve, prior to pin engagement.
6.2 Examples of alternative constructions for
the connecting yoke
Three alternative designs of pin-index, yoke-type
connection are shown in figures 5 to 7.


Page 8
EN 850 : 1996

Y

s
Y

Y-Y

q

p

|

Symbol

Dimension
mm

p 1)
q 2)

44,5 max.
24+0,5
0
0,8 min.

s 3)

1) May be reduced to 35 mm if clearance is provided for
projecting pressure relief device.
2) See the note concerning dimension h in table 2.
3)Applicable

only if a projecting pressure relief device is used.

Figure 5. Screwed yoke

 BSI 05-2001


s1

Page 9
EN 850 : 1996

View with clamping screw removed

q1

p1

Symbol

p1
q1 1)
s1
1)
2)

2)

Dimension
mm
30,2 max.
24+0,5
0
0,8 min.

See the note concerning dimension h in table 2.
Applicable only if a projecting pressure relief device is used.

Figure 6. Bolted yoke

 BSI 05-2001

|

Page 10
EN 850 : 1996

NOTE. Cam is shown in the closed position

Figure 7. Cam operated yoke

 BSI 05-2001


Page 11
EN 850 : 1996

7 Positions of holes and pins for
pin-index, yoke-type valve connections
The positions of holes and pins, for pin-index,
yoke-type valve connections, are shown in
figures 8 to 18 and in table 3.
7.1 Outlet connection with single pin system

Symbol

r

r

r

Machined face for washer

Dimension
mm

14,3 ± 0,07

Figure 8. Outlet connection for a nominal mixture of
50 % oxygen/50 % nitrous oxide (47,5 % < N2O < 52,5 %)

 BSI 05-2001


Page 12
EN 850 : 1996

7.2 Outlet connections with two-pin/single-arc
system

t

t

Machined face for washer

2

5

u

t
u
w

2

u
w

w
Symbol

5

Dimension
mm

13,6 ± 0,07
4,4 ± 0,15
8,8 ± 0,07

Figure 9. Outlet connection for oxygen

 BSI 05-2001


Page 13
EN 850 : 1996

2

6

6

u

t

t1

t

t

1

Machined face for washer

2

u
w1

w1
Symbol

Dimension
mm

t
t1
u
w1

13,6
12,4
4,4
11,55

±
±
±
±

0,07
0,07
0,15
0,07

Figure 10. Outlet connection for oxygen/carbon dioxide mixture (CO2 # 7 %)

 BSI 05-2001


Page 14
EN 850 : 1996

2

4

t
2

w1

w2

t
t2
u
w2

4

u

u

Symbol

2

t

2

t

t

Machined face for washer

Dimension
mm

13,6 ± 0,07
14,2 ± 0,07
4,4 ± 0,15
5,9 ± 0,07

Figure 11. Outlet connection for oxygen/helium mixture (He # 80 %)

 BSI 05-2001


Page 15
EN 850 : 1996

1

3

1

3

u1

u1
w3

w3

Symbol

Dimension
mm

t1
t2
u1
w3

12,4
14,2
1,5
5,65

±
±
±
±

0,07
0,07
0,15
0,07

Figure 12. Outlet connection for ethylene

 BSI 05-2001

2

t

t1

2

t

t1

Machined face for washer


Page 16
EN 850 : 1996

5

3

u1

t
t2

u1
w2

5

u1

3

w2

w2

Symbol

2

t

t

2

t

t

Machined face for washer

Dimension

mm

13,6 ± 0,07
14,2 ± 0,07
1,5 ± 0,15
5,9 ± 0,07

Figure 13. Outlet connection for nitrous oxide (gas draw off)

 BSI 05-2001