EN 13786:2004/prA1

Automatic change-over valves having a maximum outlet pressure of up to and including 4 bar with a capacity of up to and including 100 kg/h, and their associated safety devices for butane, propane or their mixtures

This European standard defines the constructional and operational characteristics, the safety requirements and test methods, and the marking of automatic change over devices with a capacity of less than or equal to 100 kg/h and having a maximum regulated pressure of less than or equal to 4 bar for butane, propane or their mixtures only in the vapour phase.
NOTE 1 bar = 105 Pa
Liquefied gases containing methylacetylene and propadiene are not covered by this standard. This European standard also covers safety devices likely to be fitted onto automatic change over devices. The characteristics of these devices are given in
annex A.

Automatische Umschaltventile mit einem höchsten Ausgangsdruck bis einschließlich 4 bar und einem Durchfluss bis einschließlich 100 kg/h für Butan, Propan oder deren Gemische sowie die dazugehörigen Sicherheitseinrichtungen

Inverseurs automatiques de débit inférieur ou égal à 100 kg/h, à pression de détente nominale maximale inférieure ou égale à 4 bar, et leurs dispositifs de sécurité associés, pour butane, propane ou leurs mélanges

Samodejni preklopni ventili z največjim izhodnim tlakom do vključno 4 bar, s pretokom do vključno 100 kg/h in pripadajočimi varnostnimi napravami za butan, propan ali njuni zmesi - Dopolnilo A1

General Information

• Status: Not Published
• ICS: 23.060.20 - Ball and plug valves
• Technical Committee: CEN/TC 181 - Dedicated liquified petroleum gas appliances
• Drafting Committee: CEN/TC 181/WG 8 - Pressure regulators and changeover devices
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Start Date: 26-Aug-2008
• Due Date: 24-Mar-2008
• Completion Date: 26-Aug-2008
• Directive: 90/396/EEC - Appliances burning gaseous fuels
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: SIST EN 13786:2004/kprA1:2008 - Automatic change-over valves having a maximum outlet pressure of up to and including 4 bar with a capacity of up to and including 100 kg/h, and their associated safety devices for butane, propane or their mixtures

Relations

• Merged Into: EN 13786:2004+A1:2008 - Automatic change-over valves having a maximum outlet pressure of up to and including 4 bar with a capacity of up to and including 100 kg/h, and their associated safety devices for butane, propane or their mixtures
• Effective Date: 19-Jan-2023
• Amends: EN 13786:2004 - Automatic change-over valves having a maximum outlet pressure of up to and including 4 bar with a capacity of up to and including 100 kg/h, and their associated safety devices for butane, propane or their mixtures
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI SIST EN
13786:2004/oprA1:2006
PREDSTANDARD
julij 2006
Samodejni preklopni ventili z največjim izhodnim tlakom do vključno 4 bar, s
pretokom do vključno 100 kg/h in pripadajočimi varnostnimi napravami za
butan, propan ali njuni zmesi - Dopolnilo A1
Automatic change-over valves having a maximum outlet pressure of up to and
including 4 bar with a capacity of up to and including 100 kg/h, and their associated
safety devices for butane, propane or their mixtures - Amendment A1
ICS 23.060.20 Referenčna številka
SIST EN 13786:2004/oprA1:2006(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD
DRAFT
EN 13786:2004
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
May 2006
ICS
English Version
Automatic change-over valves having a maximum outlet
pressure of up to and including 4 bar with a capacity of up to
and including 100 kg/h, and their associated safety devices for
butane, propane or their mixtures
Inverseurs automatiques de débit inférieur ou égal à 100 Automatische Umschaltventile mit einem höchsten
kg/h, à pression de détente nominale maximale inférieure Ausgangsdruck bis einschließlich 4 bar und einem
ou égale à 4 bar, et leurs dispositifs de sécurité associés, Durchfluss bis einschließlich 100 kg/h für Butan, Propan
pour butane, propane ou leurs mélanges oder deren Gemische sowie die dazugehörigen
Sicherheitseinrichtungen
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 181.
This draft amendment A1, if approved, will modify the European Standard EN 13786:2004. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.
This draft amendment was established by CEN 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 Management Centre has the same status
as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13786:2004/prA1:2006: E
worldwide for CEN national Members.

Foreword
This document (EN 13786:2004/prA1:2006) has been prepared by Technical Committee CEN/TC 181
“Dedicated liquefied petroleum gas appliances”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document has been elaborated mainly in order to :
- address the comments received during the formal vote on EN 13786:2004 and that was not taken into account
in the published version;
- take into account evolution of other standards written by CEN/TC 181WG8 (EN 12864, EN 13785 and their
amendments);
- include new CEN Members.
This document modifies or completes relevant clauses of EN 13786:2004, only the modified or completed
clauses are mentioned.
2. Normative references
Add the following normative references
EN 12164, Copper and copper alloys - Rod for free machining purposes
EN 12165, Copper and copper alloys - Wrought and unwrought forging stock
EN ISO 7253, Paints and varnishes - Determination of resistance to neutral salt spray (fog)

3.3.4
lockout pressure
Replace the title lockout pressure by lock up pressure and everywhere in the standard.
For English version only.
5.3.2 Regulation subassembly
Replace the last paragraph by the following :
"After the test defined in 7.2.3, the valve, as defined in 3.1.7, shall not be displaced or come out of its
housing."
5.3.4 Connection subassembly
Replace the two first paragraphs by the followings :
"Automatic change over devices shall be fitted with an inlet filter. The filter shall be made of a corrosion
and gas resistant material, and situated upstream of the valve pad. The filter mesh shall not exceed the
recommended dimensions for the 125 opening in accordance with ISO 565, or exceed 0,14 mm diameter
in case of perforated sheet.
If the filter is not integral with the automatic change over device the instructions shall state the location of
separate filter upstream."
5.3.5 Supply-reserve indicator
Replace the first paragraph by the following :
"The supply-reserve indicator, if any, shows which cylinder is in use via a signal related to the pressure at
the automatic change over device outlet."
5.3.6 Knob for selection of the operational cylinder
The note is removed.
Add the new following subclause:
"5.3.8. Non Return Valves
To prevent the leakage of gas from the inlet connection when changing cylinders, the automatic change-
over device shall be fitted with non return valves on each inlet.
This requirement is considered as met if the leak observed, at the end of the test carried out under the
conditions described in 7.2.4.2 does not exceed 200 cm /h.”
6.3.1 Gas flow safety
This subclause is deleted (replaced by 5.3.8 above).
7.1.4 Test samples
The two first paragraphs and the note are replaced by:
"For tests six identical devices shall be tested in the order specified in table 5.
After those tests the devices are dismantled and requirements of 5.1 to 5.3 are visually and dimensionally
checked."
7.2.1 Resistance to pressure
Add the following last paragraph:
"When the device has a safety valve, these tests shall be carried out in accordance with annex A."
Replace 7.2.1.3 by the following:
"7.2.1.3 Another automatic change over device is connected by its outlet to a pipe supplied with water.
The inlet connection, the vent and any other orifice opening to the atmosphere are blocked. For test
purposes, the diaphragm may be pierced to allow for the free passage of water.
After reaching the required temperature, the water pressure is increased to the maximum supply pressure.
The test shall not last less than 15 min after the application of the pressure. This test is intended to check
the mechanical strength of the cover/body assembly, therefore leakage at joints shall be disregarded
during the test.
At the end of this test, the requirements of 5.4.1.3 shall be met."
7.2.2 Mechanical strength of connections
Replace the third paragraph by the following:
"For threaded connections, the checks of 5.4.2 shall be carried out with the change over device installed in
accordance with the manufacturer’s instructions."
7.2.4.1 Soundness of the automatic change over devices
Replace the sixth paragraph by the following:
"The automatic change over device is then connected through its outlet connection to a pipe supplied with
air at a pressure of 1,5 times the regulated pressure with a minimum of 150 mbar, the two inlet
connections being sealed.”
7.2.4.2 Gas flow safety device
The complete subclause 7.2.4.2 is replaced by the following:
"7.2.4.2 Non Return Valve
This test shall be carried out with a 0,4 mm injector connected to the outlet connection allowing air to flow
constantly through the test.
Each inlet connection shall be supplied in turn with air at pressures of 300 mbar and 8,25 bar for butane,
1 bar and 17,5 bar for propane and 300 mbar and 17,5 bar for LPG mixtures. The opposite Non Return
Valve shall be checked for soundness with the manual change over device in both supply and reserve
positions.
The requirements of 5.3.8 shall be met."
7.2.5.1 Automatic change over devices endurance
The complete subclause 7.2.5.1 is replaced by the following:
"7.2.5.1 Automatic change over devices endurance
Both inlets of the automatic change over device, in its normal operating position, are connected to an air
supply of 1,4 bar for Butane and 7,5 bar for Propane and LPG, at a temperature of (20 ± 5) °C.
The flow rate is adjusted to 20% of the guaranteed rate.
10 000 cycles are carried out, consisting of:
a) Interruption of the outlet flow to induce lockup;
b) Restoration the outlet flow;
c) Every 10 cycles the manual change-over valve is alternated.
Each cycle should allow the diaphragm to flex and for the valve to be held on its seat for 1 second.
Minimum cycle time shall be 5 seconds.
The requirements of 5.6 shall be met."
Annex B
Replace the Annex B by the new following Annex B:
Annex B
(Normative)
Special requirements for automatic change over devices and automatic change over device
systems for caravans, motor caravans or fresh water boats
An automatic change over device system shall be supplied as a complete assembly by the manufacturer
or as an assembly of parts ("kit") which, once assembled, will be equivalent to an automatic change over
device meeting the requirements of this European Standard.
Automatic change over devices and change over device systems for use in seawater boats are dealt with
in Annex J.
This annex B is applicable when the vehicle or boat is equipped with appliances operating in category
I , supplied by means of LPG cylinders within the temperature and pressure ranges specified in
3B/P(30)
Clauses 1 and 6.
In the following text "caravan" is used either for caravan or freshwater boats.
If the system is supplied as a kit it shall be easy to assemble correctly and difficult to assemble incorrectly.
If special tools are specified for the assembly of the system they shall be supplied with the kit. It shall be
possible to verify with tests the operation and soundness of the system once it is assembled and installed.
Clear and sufficient instructions for the assembly and tests shall be supplied with the kit.
Flexible hoses used in the system shall meet the requirements of prEN 1763.
The length of flexible hoses used shall be in accordance with EN 1949.
All the connections used in the automatic change over device system shall be designed so as to prevent
interchangeability with other devices which are not designed to be used in the system and to prevent parts
of the system from being used independently.
The inlet and outlet connections shall comply with Annex D of EN 12864. Intermediate connections shall
be different from the system inlet and outlet connections if the assembly can be taken apart.
The second regulator included in the assembly is a fixed type as described in EN 13785. The tests on this
regulator shall be carried out using the methods given in EN 13785, under the pressures declared by the
manufacturer.
The regulated pressures shall be in accordance with Annex D of EN 12864.
The nominal rate shall not be greater than 1,5 kg/h.
The automatic change over device or the automatic change over device system shall incorporate a safety
device limiting pressure as in Annex D of EN 12864.
Cylinder mounted regulators used in change over device systems shall meet the resistance to impact
requirements of EN 12864, with the outlet connection protected.
Automatic change over devices and automatic change over devices systems complying with this annex
shall carry in a durable, legible and visible fashion the marking "Caravan(e)".
In addition when the two stages of regulation are identified separately:
 first stage of regulation shall only indicate the values of the supply pressure as information on the
pressure;
 second stage of regulation shall only indicate the regulated pressure 30 mbar as information on the
pressure;
 nominal rate shall be indicated in the information of the second stage of regulation.
The instructions shall include a warning of the type " Only for use in caravans, motor caravans and
freshwater boats ".
The instructions of the caravan automatic change over devices or automatic change over device systems
shall also include the following warning "This automatic change over device (system) is not suitable for
mobile homes".
Note: Requirements of 5.3.6 are not mandatory for such automatic change over devices and change over
device systems.
Table G.1 is replaced by the following:
Table G.1 — Threaded inlet connections used in the various countries (see 5.3.4.1)
Type Threaded connections
Figure
Country G.1 G.2 G.3 G.4 G.5 G.6 G.7 G.8 G.9 G.10 G.11 G.12 G.13 G.14 G.15 G.16 G.17 G.18 G.19 G.20 G.21 G.22 G.23 G.24 G.25 G.26 G.27 G.28
a)
Code
AT  x x     x     x x
BE  x          x
CH  x          x
CY
CZ  x x x  x x  x x x x  x  x x x
DE  x x x  x x  x x x x  x x x x x
DK  x x x         x
EE
ES  x     x x   x x x
FI            x
x x     x x  x   x  x x x
FR
GB    x x x   x  x   x
GR x x      x x    x x
HU
IE            x
IS
IT x x      x     x
LT
LU
LV
Table G.1 — Threaded inlet connections used in the various countries (see 5.3.4.1) (end)

Type Threaded connections
Figure
G.1 G.2 G.3 G.4 G.5 G.6 G.7 G.8 G.9 G.10 G.11 G.12 G.13 G.14 G.15 G.16 G.17 G.18 G.19 G.20 G.21 G.22 G.23 G.24 G.25 G.26 G.27 G.28
Country
a)
Code
MT
NO
...