Standard
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AS 4795.2:2025
[Current]Butterfly valves for waterworks purposes, Part 2: Double flanged
Specifies requirements for PN 10, PN 16, PN 21, PN 25 and PN 35 resilient-seated double flanged butterfly valves for waterworks purposes with a maximum operating temperature of 40 degrees Celsius
Published: 07/03/2025
Pages: 25
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Evaluation of product conformity
1.5 Designation of size
1.6 Allowable operating pressures (AOPs)
2 Materials and components
2.1 General
2.2 Corrosion-resistant materials
2.3 Contamination of water
2.4 Elastomeric components
3 Design
3.1 General
3.2 End connections
3.3 Component design
3.3.1 Castings
3.3.2 External drainage holes
3.3.3 Face-to-face dimensions
3.3.4 Supports
3.3.5 Seal options
3.3.6 Shaft
3.3.7 Shaft sealing and ingress
3.3.8 Shaft bearings
3.3.9 End thrust
3.3.10 Input stops and torque-limiting devices
3.3.11 Position indicator
3.3.12 Lockout devices
3.4 Operation
3.4.1 General
3.4.2 Direction of closure
3.4.3 Spindle cap, spindle extension and key
3.4.4 Extension spindle and spindle tube
3.5 Gearboxes
3.6 Lifting devices
4 Protective coatings
4.1 General
4.2 Components
4.3 Continuous immersion
5 Testing
5.1 General and test sequence
5.1.1 General
5.1.2 Test sequence
5.1.2.1 Performance tests
5.1.2.2 Production tests
5.2 Performance tests
5.2.1 Body strength test (Test A)
5.2.2 Disc strength test (Test B)
5.2.3 Shaft strength test (Test C)
5.2.4 Valve operational test (Test D)
5.2.5 Sealing test (Test E)
5.2.6 Body rubber adhesion test (Test F)
5.2.7 Lockout device strength test (Test G)
5.3 Production tests
5.3.1 Weld deposit seat test (Test 1)
5.3.2 Coating test (Test 2)
5.3.3 Body test (Test 3)
5.3.4 Sealing test (Test 4)
6 Marking and packaging
6.1 Marking
6.1.1 On body of valve
6.1.2 Nameplate or label
6.1.3 Secondary marking
6.2 Direction of closure for handwheels and caps
6.3 Packaging
6.3.1 General
6.3.2 Buried service valves
Appendix A
A.1 Scope
A.2 Relevance
A.3 Minimum sampling and testing frequency plan
A.3.1 General
A.3.2 Testing
A.3.3 Retesting
Appendix B
B.1 General
B.2 Purchaser options
B.3 Information to be supplied by the purchaser
Appendix C
C.1 Scope
C.2 Surface preparation
C.3 Materials
C.4 Application and finish
C.5 Testing
Cited references in this standard