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eLibrary > BS EN 13774:2013 Valves for gas distribution systems with maximum operating pressure less than or equal to 16 bar. Performance requirements >

BS EN 13774:2013 Valves for gas distribution systems with maximum operating pressure less than or equal to 16 bar. Performance requirements, 2013

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BS EN 13774:2013 Valves for gas distribution systems with maximum operating pressure less than or equal to 16 bar. Performance requirements, 2013

1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Requirements, type tests and production tests [Go to Page]
5.1 Type testing [Go to Page]
5.1.1 Test samples
5.1.2 Test documents
5.1.3 Certification body
5.2 Materials [Go to Page]
5.2.1 Shell
5.2.2 Obturator
5.2.3 Stem or shaft
5.2.4 Springs
5.2.5 Seals
5.2.6 Lubricants
5.3 Design [Go to Page]
5.3.1 General
5.3.2 Strength design
5.3.3 Stems or shafts
5.3.4 Shell tappings
5.3.5 Bolt holes for assembly purposes
5.3.6 Manufacturing apertures
5.3.7 Sealing systems
5.3.8 Extended drain, vent and sealant lines
5.4 Dimensions [Go to Page]
5.4.1 Threaded ends
5.4.2 End connections
5.4.3 End-to-end dimensions
5.5 Operability and endurance
5.6 Strength of stops
5.7 Mechanical resistance against excessive actuating forces
5.8 Resistance of the obturator to static differential pressure
5.9 Shell strength
5.10 External leak tightness
5.11 Internal leak tightness
5.12 Resistance to wear (optional test)
5.13 Reference flow rate (optional test)
5.14 Cleanliness
5.15 Storage
5.2.1.1 General
5.2.1.2 Steel weldings ends
5.2.1.3 PE ends
6 Marking
Annex A (normative) Test methods for valves [Go to Page]
A.1 Accuracy of measurements and stability
A.2 Test method 1: operability and operating forces test [Go to Page]
A.2.1 General
A.2.2 Operability test
A.2.3 Endurance test
A.3 Test method 2: strength of stops [Go to Page]
A.3.1 General
A.3.2 Procedure
A.4 Test method 3: resistance of the obturator to static differential pressure
A.5 Test method 4: wear test [Go to Page]
A.5.1 General
A.5.2 Procedure [Go to Page]
A.5.2.1 Dust loading
A.5.2.2 Verification
A.6 Test method 5: internal leak tightness test for DIB valves [Go to Page]
A.6.1 General
A.6.2 Procedure [Go to Page]
A.6.2.1 Test fluid
A.6.2.2 Leak tightness on the upstream
A.6.2.3 Leak tightness on the downstream
A.6.3 Test conditions
A.7 Test method 6: strength test on torque/thrust [Go to Page]
A.7.1 General
A.7.2 Measured breakaway torque/thrust
A.7.3 Performance of test
A.7.4 Acceptance criteria
Annex B (informative) European Standards for valves
Annex C (informative) Summary of tests on product and type tests [Go to Page]

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BS EN 13774:2013 Valves for gas distribution systems with maximum operating pressure less than or equal to 16 bar. Performance requirements, 2013

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