Standard
UPDATE AVAILABLE
AS 4795.2-2011
[Superseded]Butterfly valves for waterworks purposes, Part 2: Double flanged
Specifies requirements for PN10, PN16, PN21 and PN35 manually operated resilient-seated double-fanged valves for waterworks purposes, with a maximum operating temperature of 40 degrees Celsius.
Published: 15/11/2011
Pages: 30
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Application
1.3 Normative references
1.4 Definitions
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 Welding and post-weld heat treatment
3.3.2 Castings
3.3.3 External drainage holes
3.3.4 Face-to-face dimensions
3.3.5 Supports
3.3.6 Seal options
3.3.7 Shaft
3.3.8 Shaft sealing and ingress
3.3.9 Shaft bearings
3.3.10 End thrust
3.3.11 Input stops and torque-limiting devices
3.3.12 Position indicator
3.3.13 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 External spindle tube
3.5 Gearboxes
3.6 Lifting devices
3.7 Fasteners
4 Protective coatings
4.1 General
4.2 Components
4.3 Continuous immersion
5 Performance tests
5.1 General and test sequence
5.1.1 General
5.1.2 Test sequence
5.1.2.1 Type testing
5.1.2.2 Production testing
5.2 Type tests
5.2.1 Body strength test (Test A)
5.2.2 Free-end test (Test B)
5.2.3 Disc strength test (Test C)
5.2.4 Shaft strength test (Test D)
5.2.5 Valve operational test (Test E)
5.2.6 Sealing test (Test F)
5.2.7 Weld deposit body seat test (Test G)
5.3 Production tests
5.3.1 Coating test (Test 1)
5.3.2 Body strength test (Test 2)
5.3.3 Sealing test (Test 3)
5.3.4 Reverse sealing test (Test 4)
5.3.5 Disc strength test (Optional)
5.3.6 Free-end test (Optional)
5.3.7 Weld deposit seat test (Test 5)
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
A1 Scope
A2 Relevance
A3 Product certification
A4 Minimum sampling and testing frequency plan
A4.1 General
Appendix B
B1 General
B2 Purchaser options
B3 Information to be supplied by the purchaser
Appendix C
Appendix D
D1 Scope
D2 Surface preparation
D3 Materials
D4 Application and finish
Cited references in this standard