NEN EN 88-1 : 2011 + A1 2016

1 Scope
2 Normative references
3 Terms and definitions
  3.1 Pressure regulators
  3.2 Pressures
      3.2.1 General
      3.2.2 Pressure regulator pressures
  3.3 Pressure regulator flow rates
  3.4 Component parts
  3.5 Performance
4 Classification
  4.1 Classes of pressure regulator
  4.2 Groups of pressure regulator
  4.3 Designation
5 Units of measurement and test conditions
  5.1 Units of measurement
  5.2 Test conditions
6 Construction requirements
  6.1 General
  6.2 Construction
      6.2.1 General
      6.2.2 Outlet pressure adjustment
      6.2.3 Resistance to pressure
  6.3 Materials
  6.4 Gas connections
  6.5 Seals for glands for moving parts
  6.6 Pressure test nipples
7 Performance requirements
  7.1 General
      7.1.1 Requirements
      7.1.2 Test for compliance
  7.2 External leak tightness
  7.3 Test for external leak tightness
  7.4 Torsion and bending
  7.5 Torsion and bending tests
  7.6 Durability
  7.7 Pressure regulator performance
      7.7.1 General
      7.7.2 General test procedure
      7.7.3 Class A regulator performance
      7.7.4 Test for class A regulators
      7.7.5 Class B regulator performance
      7.7.6 Test for class B regulators
      7.7.7 Class C regulator performance
      7.7.8 Test for class C regulators
      7.7.9 Pressure drop requirements
      7.7.10 Pressure drop tests
      7.7.11 Durability of performance requirements
      7.7.12 Test for durability of performance
      7.7.13 Lock-up pressure
      7.7.14 Test for lock-up pressure
8 Marking, installation and operating instructions
  8.1 Marking
  8.2 Installation, operating and servicing instructions
  8.3 Warning notice
Annex A (informative) - Typical pressure regulators and pressure
        regulator parts
Annex B (informative) - Use of ISO 7-1:1994 and EN ISO 228-1:2003
        threads for gas connections
Annex C (informative) - Summary of requirements and test conditions
        C.1 Requirements
        C.2 Test procedure
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of EU Directive
         90/396/EEC
Bibliography

Defines the safety, construction and performance requirements for pressure regulators and pneumatic gas/air ratio pressure regulators (zero pressure regulators are included as a special type of pneumatic gas/air ratio pressure regulator), intended for use with gas burners, gas appliances and similar use, hereafter referred to as 'pressure regulators'.