This European Standard deals with metal isolating valves used for gas distribution systems with maximum operating pressure up to 16 bar, and which operate with fuel gases of the first, the second and the third family, in accordance with EN 437.<\/p>\n
The types of isolating valves to be considered are: plug and ball valves, gate valves, globe valves and butterfly valves.<\/p>\n
This standard does not apply to:<\/p>\n
valves for domestic installations;<\/p>\n<\/li>\n
safety type pressure relief valves;<\/p>\n<\/li>\n
wellhead valves.<\/p>\n<\/li>\n<\/ul>\n
In the case of power operated valves, the requirements for the power source are not covered by this European Standard.<\/p>\n
The valves covered in this European Standard operate in the following classes of temperature:<\/p>\n
– 10 \u00b0C to 60 \u00b0C;<\/p>\n<\/li>\n
– 20 \u00b0C to 60 \u00b0C;<\/p>\n<\/li>\n
the range is stated by the purchaser for special design.<\/p>\n<\/li>\n<\/ul>\n
This European Standard gives additional requirements to the relevant products standards. (See Annex B.)<\/p>\n
In case of contradictions between the standards mentioned in Annex B and this European Standard, EN 13774 prevails.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 4 Symbols and abbreviations 5 Requirements, type tests and production tests 5.1 Type testing 5.1.1 Test samples 5.1.2 Test documents <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 5.1.3 Certification body 5.2 Materials 5.2.1 Shell 5.2.1.1 General 5.2.1.2 Steel weldings ends <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 5.2.2 Obturator 5.2.3 Stem or shaft 5.2.1.3 PE ends <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 5.2.4 Springs 5.2.5 Seals 5.2.6 Lubricants 5.3 Design 5.3.1 General <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5.3.2 Strength design 5.3.3 Stems or shafts 5.3.4 Shell tappings <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.4 Dimensions 5.4.1 Threaded ends <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.4.2 End connections 5.4.3 End-to-end dimensions 5.5 Operability and endurance <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.10 External leak tightness 5.11 Internal leak tightness 5.12 Resistance to wear (optional test) <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5.13 Reference flow rate (optional test) 5.14 Cleanliness 5.15 Storage 6 Marking <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Annex A (normative) Test methods for valves A.1 Accuracy of measurements and stability A.2 Test method 1: operability and operating forces test A.2.1 General A.2.2 Operability test A.2.3 Endurance test <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | A.3 Test method 2: strength of stops 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 A.5.1 General A.5.2 Procedure A.5.2.1 Dust loading <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | A.5.2.2 Verification A.6 Test method 5: internal leak tightness test for DIB valves A.6.1 General A.6.2 Procedure A.6.2.1 Test fluid A.6.2.2 Leak tightness on the upstream <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | A.6.2.3 Leak tightness on the downstream A.6.3 Test conditions A.7 Test method 6: strength test on torque\/thrust A.7.1 General A.7.2 Measured breakaway torque\/thrust <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | A.7.3 Performance of test A.7.4 Acceptance criteria <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Annex B (informative) European Standards for valves <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Annex C (informative) Summary of tests on product and type tests <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Valves for gas distribution systems with maximum operating pressure less than or equal to 16 bar. Performance requirements<\/b><\/p>\n |