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AS 4794-2001


Non-return valves for waterworks purposes — Swing check and tilting disc

Specifies requirements for the material, design and performance of metal-bodied non-return valves (swing check and tilting disc types) for use in water supply and sewerage systems (swing check only) suitable for operation both in horizontal and vertical positions. Classification ranges from Class 16 to 35 valves in the size range DN 80 to DN 750 inclusive, with the maximum temperature of the medium flowing through the valve not exceeding 60 degrees Celsius.
Published: 27/02/2001
Pages: 22
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Referenced documents
1.3 Definitions
1.4 Valve type
1.5 Designation of size
1.6 Allowable pressures
2 Materials and components
2.1 Materials
2.2 Dezincification-resistant materials
2.3 Contamination of water
2.4 O-rings (elastomeric toroidal sealing rings)
3 Design
3.1 Design
3.1.1 Installation limitations
3.2 End connections
3.2.1 Flanges
3.2.2 Face-to-face dimensions
3.3 Component design
3.3.1 Body and cover
3.3.2 Body end ports
3.3.3 Bore of valve (swing check valve)
3.3.4 Body tappings
3.3.5 Body-to-cover connection
3.3.6 Seat closure
3.3.7 Hinge to disc connection—Swing check valve
3.3.8 Body seat and disc facing rings
3.3.9 Hinge pin and bearings
3.3.10 Disc interference
3.3.11 Travel stop
3.3.12 Extended hinge pin
3.3.13 Counterweight lever and counterweight
3.3.14 Position indicator
3.4 Freedom from defects
3.5 Lifting devices
3.6 Inspection covers
4 Coatings
4.1 General
4.2 Design
5 Testing
5.1 Type tests
5.1.1 General
5.1.2 Endurance test
5.1.3 Strength test (hinge pin/hinge connection) for valves with extended spindles
5.1.4 Body strength pressure test
5.2 Production tests
5.2.1 General
5.2.2 Body test
5.2.3 Valve seat test
5.2.4 Valve seat sensitivity test
5.3 Test pressures
5.4 Test duration
5.5 Coating test
6 Markings and packaging
6.1 Body markings
6.2 Application
6.3 Packaging
Appendix A
A1 Scope
A2 Relevance
A3 Product certificaiton
A4 Testing
A4.1 General
A4.2 Retesting
A4.3 Rejection after retest
Appendix B
B1 General
B2 Information to be supplied by the purchaser
B3 Information to be supplied by the manufacturer
Appendix C
Appendix D
D1 Scope
D2 Principle
D3 Apparatus
D4 Procedure
D5 Test report
Appendix E
E1 Scope
E2 Principle
E3 Apparatus
E4 Procedure
E5 Test report
Cited references in this standard
[Available Superseded]
High-strength steel bolts with associated nuts and washers for structural engineering
SAA HB18.28
Guidelines for third-party certification and accreditation, Guide 28: General rules for a model third-party certification scheme for products
Standard specification for stainless steel bars and shapes
AS/NZS 4331
Metallic flanges
Thermal-bonded polymeric coatings on valves and fittings for water industry purposes
Content history
DR 99004
AS 4794-2001 Rec:2015