Sum-up standards applicable for butterfly valves (design, face-to-face, testing,etc..)? Is there any comparison between American and DIN standards?
1)British:-
Design standard:-BS-5155 (WAFER TYPE)
Testing standard:-BS-6755(PT-1)(FLANGE&WAFER)
2)A)AMERICAN:-
Design standard:-API-609(OFFSET TYPE)
Testing standard:-API-598(butterfly,gate,globe,check)
  B)
Design:-MSS-SP67,MSS-SP68
TEST:-AWWA-C-504
  C)
FACE TO FACE-ANSI-B-16.10
DESIGN& TESTING:-ANSI-B-16.34
If fire-testing is a requirement then valves to be tested to the relevant fire test specification e.g. API 609 valves tested to API 607, BS valves to BS 6755 Part 2,etc)
Design: EN 593 Flange connection: ISO 7005 F to F: ISO 5752, EN 558
Marking: EN 19 Topflange: ISO 5211 Testing: ISO 5208, EN 12266, EN 1074
Definitions of valve parts see EN 736

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