UNI EN 13785 : 2009

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 regulators
  4.1 Introduction
  4.2 Regulators for installations where the final
      regulator supplies a pressure specified in
      EN 437
  4.3 Other regulators
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
  5.4 Mechanical strength
      5.4.1 Resistance to impact
      5.4.2 Resistance to pressure
      5.4.3 Strength of connections
  5.5 Soundness
  5.6 Mechanical endurance
      5.6.1 General requirements
      5.6.2 Special requirements
  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
      6.1.3 Regulated pressure
  6.2 Supply pressure and regulated pressure
      according to 4.2
      6.2.1 Single stage fixed regulator for
            EN 437 pressures
      6.2.2 Two stages fixed or adjustable
            regulators for EN 437 pressures
      6.2.3 Three stages fixed or adjustable
            regulators for EN 437 pressures
  6.3 Variable regulators
  6.4 Regulators out of the pressures of EN 437
7 Test methods
  7.1 General conditions
      7.1.1 Type of test gas
      7.1.2 Test conditions
      7.1.3 Equivalence formulas
      7.1.4 Test samples
  7.2 Verification of constructional characteristics
      7.2.1 Resistance to impact
      7.2.2 Resistance to pressure
      7.2.3 Mechanical strength of connections
      7.2.4 Regulation subassembly
      7.2.5 Soundness
      7.2.6 Mechanical endurance
      7.2.7 Resistance to humidity changes
      7.2.8 Resistance to corrosion
  7.3 Verification of performance characteristics
      7.3.1 General
      7.3.2 Plotting of the performance curves
8 Marking, packaging, instructions
  8.1 General
  8.2 Marking of the regulator
  8.3 Packaging
  8.4 Instructions for installation, use and maintenance
Annex A (normative) - Special requirements for regulators
        fitted with pressure or rate operated safety
        devices
      A.1 Regulators 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 Regulator marking
      A.2 Regulators 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 Regulators 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 Regulators fitted with an excess flow valve
          A.4.1 Definition
          A.4.2 Performance characteristics
          A.4.3 Test methods
          A.4.4 User and maintenance instructions
      A.5 Regulators 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 User and maintenance instructions
Annex B (normative) - Special requirements for
        regulators fitted with a thermal cut out
      B.1 Definition
      B.2 Constructional characteristics
      B.3 Performance characteristics
      B.4 Test methods
Annex C (normative) - Special requirements for low
        pressure regulators 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 regulators
      E.1 Scope
      E.2 Materials
      E.3 Special conditions for carrying out the
          tests mentioned in the body of the document
          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 (informative) - 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 regulators
          I.4.2 Duration of tests
          I.4.3 Checks
          I.4.4 Cleaning of regulators
      I.5 Results
Annex ZA (informative) - Relationship between this
         European Standard and the Essential Requirements
         of EU Directive 90/396/EEC
Bibliography

Describes the constructional and operational characteristics, the safety requirements, test methods and the marking of regulators having a capacity of less than or equal to 100 kg/h, other than the regulators covered by EN 12864, for butane, propane or their mixtures, in the gaseous phase.