• UNI EN 13786 : 2009

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    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

    Available format(s): 

    Superseded date:  03-07-2013

    Language(s): 

    Published date:  31-12-2008

    Publisher:  Ente Nazionale Italiano di Unificazione (UNI)

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    1 Scope
    2 Normative references
    3 Terms and definitions
      3.1 General terms and definitions
      3.2 Terms and definitions concerning gas
      3.3 Terms and definitions concerning pressures
      3.4 Terms and definitions concerning rates
    4 Types of automatic change over devices
      4.1 Introduction
      4.2 Automatic change over devices for installations
          where the final regulator supplies a pressure
          specified in EN 437
      4.3 Other automatic change over devices installation
    5 Constructional characteristics
      5.1 General
      5.2 Materials
      5.3 Special requirements
          5.3.1 Pressure sensing subassembly
          5.3.2 Regulation subassembly
          5.3.3 Back pressure subassembly
          5.3.4 Connection subassembly
          5.3.5 Supply-reserve indicator
          5.3.6 Knob for selection of the operational
                cylinder
          5.3.7 Fixing onto a wall
          5.3.8 Non return valves
      5.4 Mechanical strength
          5.4.1 Resistance to pressure
          5.4.2 Strength of connections
      5.5 Soundness
      5.6 Mechanical endurance
      5.7 Resistance to humidity changes
      5.8 Resistance to corrosion
    6 Performance characteristics
      6.1 General
          6.1.1 Introduction
          6.1.2 Supply pressure
      6.2 Operational limit characteristics (regulation
          function)
      6.3 Operational limit characteristics (Change over
          function)
          6.3.1 Change over pressure
          6.3.2 Selection of the operating cylinder
    7 Test methods
      7.1 General conditions
          7.1.1 Type of test gas
          7.1.2 Test conditions
          7.1.3 Equivalence formulae
          7.1.4 Test samples
      7.2 Verification of constructional characteristics
          7.2.1 Resistance to pressure
          7.2.2 Mechanical strength of connections
          7.2.3 Regulation subassembly
          7.2.4 Soundness
          7.2.5 Endurance
          7.2.6 Resistance to humidity changes
          7.2.7 Resistance to corrosion
      7.3 Verification of performance characteristics
          7.3.1 General
          7.3.2 Plotting of regulation curves
    8 Marking, packaging, instructions
      8.1 General
      8.2 Marking of the device
      8.3 Packaging
      8.4 Instructions for use and maintenance
    Annex A (normative) - Special requirements for automatic
            change over devices fitted with pressure or rate
            operated safety valves
          A.1 Change over devices fitted with an over-pressure
               relief
               A.1.1 Definition
               A.1.2 Constructional characteristics
               A.1.3 Performance characteristics
               A.1.4 Test methods
               A.1.5 Automatic change over device marking
          A.2 Automatic change over device fitted with
               an over-pressure shut off safety valve
               A.2.1 Definition
               A.2.2 Constructional characteristics
               A.2.3 Performance characteristics
               A.2.4 Test methods
          A.3 Automatic change over device fitted with
               an under-pressure shut off safety device
               A.3.1 Definition
               A.3.2 Constructional and performance
                     characteristics
               A.3.3 Test methods
          A.4 Automatic change over devices fitted with
               an excess flow valve
               A.4.1 Definition
               A.4.2 Performance characteristics
               A.4.3 Complementary tests for the automatic
                     change over devices - Test methods
               A.4.4 User and maintenance instructions
          A.5 Automatic change over devices fitted with
               a regulated pressure limiter
               A.5.1 Definition
               A.5.2 Constructional and performance
                     characteristics
               A.5.3 Test methods
               A.5.4 Users and maintenance instructions
    Annex B (normative) - Special requirements for automatic
            change over devices and automatic change over
            device systems for caravans, motor caravans or
            fresh water boats
    Annex C (normative) - Special requirements for low
            pressure automatic change over devices under
            extreme temperature conditions (temperatures
            below - 20 degrees C)
    Annex D (normative) - Method for measuring leaks at
            test pressures less than or equal to 16 bar
          D.1 Scope
          D.2 Diagram of the test bench
          D.3 Coefficient K
               D.3.1 Method
               D.3.2 Calculations
          D.4 Measurement of the leak
               D.4.1 Method
               D.4.2 Calculations
          D.5 Checks
    Annex E (normative) - Complementary test requirements
            for non metallic thermoplastic or thermal setting
            materials used in the construction of automatic
            change over devices
          E.1 Scope
          E.2 Materials
          E.3 Special conditions for carrying out the test
               mentioned in the body of the standard
               E.3.1 Resistance to impact
               E.3.2 Mechanical resistance of connections
               E.3.3 Soundness
          E.4 Special requirements
               E.4.1 Resistance to hydrocarbons
               E.4.2 Resistance to cracking under stress
                     and when chemical agents are present
               E.4.3 Characteristics relating to fire
                     resistance
               E.4.4 Accelerated ageing
          E.5 Sampling and order of tests
    Annex F (normative) - Requirements for elastomeric
            reinforced diaphragms
    Annex G (normative) - Inlet connections
    Annex H (normative) - Outlet connections
    Annex I (normative) - Test method for resistance
            to corrosion
          I.1 Principle
          I.2 Reagents
               I.2.1 Saline solution
               I.2.2 Compressed air
               I.2.3 Salt mist
          I.3 Apparatus
               I.3.1 Spraying chamber
               I.3.2 Sprayers
               I.3.3 Heating device
               I.3.4 Salt solution supply device
               I.3.5 Compressed air supply device
               I.3.6 Mist collectors
          I.4 Test method
               I.4.1 Method of exposure of automatic
               change over device
               I.4.2 Duration of tests
               I.4.3 Checks
               I.4.4 Cleaning of automatic change over device
          I.5 Results
    Annex J (normative) - Automatic change over device and
            change over device systems for LPG cylinders
            to supply appliances installed in seawater boats
          J.1 Scope
          J.2 General
          J.3 Maximum guaranteed rate
          J.4 Change over device and change over device
               systems fitted with a pressure relief valve
          J.5 Vent
          J.6 Connections
          J.7 Material
          J.8 Resistance to corrosion
               J.8.1 General
               J.8.2 Requirement
               J.8.3 Test method
          J.9 Marking
          J.10 Instructions for use and maintenance
    Annex ZA (informative) - Clauses of this European
             Standard addressing essential requirements
             or other provisions of EU Directives
    Bibliography

    Abstract - (Show below) - (Hide below)

    Describes 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.

    General Product Information - (Show below) - (Hide below)

    Document Type Standard
    Publisher Ente Nazionale Italiano di Unificazione (UNI)
    Status Superseded
    Superseded By
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    EN 12864:2001/A3:2009 LOW-PRESSURE, NON ADJUSTABLE REGULATORS HAVING A MAXIMUM OUTLET PRESSURE OF LESS THAN OR EQUAL TO 200 MBAR, WITH A CAPACITY OF LESS THAN OR EQUAL TO 4 KG/H, AND THEIR ASSOCIATED SAFETY DEVICES FOR BUTANE, PROPANE OR THEIR MIXTURES
    ISO 7005-2:1988 Metallic flanges — Part 2: Cast iron flanges
    EN ISO 75-3:2004/AC:2006 Plastics - Determination of temperature of deflection under load - Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics (ISO 75-3:2004)
    EN ISO 180:2000/A2:2013 PLASTICS - DETERMINATION OF IZOD IMPACT STRENGTH (ISO 180:2000/AMD 2:2013)
    EN ISO 527-4:1997 PLASTICS - DETERMINATION OF TENSILE PROPERTIES - PART 4: TEST CONDITIONS FOR ISOTROPIC AND ORTHOTROPIC FIBRE-REINFORCED PLASTIC COMPOSITES
    EN ISO 4892-3:2016 Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV lamps (ISO 4892-3:2016)
    EN ISO 9773:1998/A1:2003 Plastics - Determination of burning behaviour of thin flexible vertical specimens in contact with a small-flame ignition source - Amendment 1: Specimens (ISO 9773:1998/Amd 1:2003)
    ISO 9773:1998 Plastics — Determination of burning behaviour of thin flexible vertical specimens in contact with a small-flame ignition source
    ISO 565:1990 Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of openings
    EN ISO 178:2010/A1:2013 PLASTICS - DETERMINATION OF FLEXURAL PROPERTIES (ISO 178:2010/AMD 1:2013)
    EN ISO 7253 : 2001 PAINTS AND VARNISHES - DETERMINATION OF RESISTANCE TO NEUTRAL SALT SPRAY (FOG)
    EN ISO 3166-1:2014 Codes for the representation of names of countries and their subdivisions - Part 1: Country codes (ISO 3166-1:2013)
    EN ISO 228-1:2003 Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1:2000)
    ISO 7-1:1994 Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation
    EN 437:2003+A1:2009 Test gases - Test pressures - Appliance categories
    ISO 180:2000 Plastics Determination of Izod impact strength
    ISO 4892-3:2016 Plastics Methods of exposure to laboratory light sources Part 3: Fluorescent UV lamps
    EN 1949:2011+A1:2013 Specification for the installation of LPG systems for habitation purposes in leisure accommodation vehicles and accommodation purposes in other vehicles
    EN 12164:2016 Copper and copper alloys - Rod for free machining purposes
    EN 13785:2005+A1:2008 Regulators with a capacity of up to and including 100 kg/h, having a maximum nominal outlet pressure of up to and including 4 bar, other than those covered by EN 12864 and their associated safety devices for butane, propane or their mixtures
    ISO 9227:2017 Corrosion tests in artificial atmospheres — Salt spray tests
    ISO 3166-1:2013 Codes for the representation of names of countries and their subdivisions Part 1: Country codes
    EN 549:1994 Rubber materials for seals and diaphragms for gas appliances and gas equipment
    EN 12165:2016 COPPER AND COPPER ALLOYS - WROUGHT AND UNWROUGHT FORGING STOCK
    ISO 301:2006 Zinc alloy ingots intended for castings
    ISO 178:2010 Plastics Determination of flexural properties
    ISO 228-1:2000 Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation
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