AS 4795-2002

1 - AS 4795-2002 DOUBLE-FLANGED BUTTERFLY VALVES FOR WATERWORKS PURPOSES
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 REFERENCED DOCUMENTS
6 - 1.3 DEFINITIONS
6 - 1.3.1 Bonded
6 - 1.3.2 Ring body flange valve
6 - 1.3.3 Seal on disc
6 - 1.3.4 Seal in body
7 - 1.3.5 Seal on body
7 - 1.3.6 Vulcanize
7 - 1.4 DESIGNATION OF SIZE
7 - 1.5 ALLOWABLE OPERATING PRESSURES
8 - SECTION 2 MATERIALS AND COMPONENTS
8 - 2.1 GENERAL
8 - 2.2 CORROSION-RESISTANT MATERIALS
8 - 2.3 CONTAMINATION OF WATER
8 - 2.4 O-RINGS (ELASTOMERIC TOROIDAL SEALING RINGS)
10 - SECTION 3 DESIGN
10 - 3.1 GENERAL
10 - 3.2 END CONNECTIONS
11 - 3.3 COMPONENT DESIGN
11 - 3.3.1 Welding and post-weld heat treatment
11 - 3.3.2 Castings
11 - 3.3.3 External drainage holes
11 - 3.3.4 Face-to-face dimensions
12 - 3.3.5 Supports
12 - 3.3.6 Seal options
13 - 3.3.7 Shaft
13 - 3.3.8 Shaft seal
13 - 3.3.9 Bearings
13 - 3.3.10 End thrust
13 - 3.3.11 Position indicator
14 - 3.3.12 Manual actuators and gearboxes
14 - 3.3.13 Portable actuators
14 - 3.3.14 Position-stops
14 - 3.3.15 Torque-limiting devices
15 - 3.3.16 Handwheels and caps
15 - 3.4 MANUAL ACTUATOR
15 - 3.4.1 Manual actuator orientation
15 - 3.4.2 Tolerances
15 - 3.5 LIFTING DEVICES
15 - 3.6 EXTENSION SPINDLE ASSEMBLY
16 - 3.7 FASTENERS
17 - SECTION 4 PROTECTIVE COATINGS
17 - 4.1 GENERAL
17 - 4.2 COMPONENTS
18 - SECTION 5 PERFORMANCE TESTS
18 - 5.1 GENERAL AND TEST SEQUENCE
18 - 5.1.1 General
18 - 5.1.2 Test sequence
18 - 5.2 TYPE TESTS
18 - 5.2.1 Body strength test (Test A)
18 - 5.2.2 Disc strength test (Test B)
18 - 5.2.3 Shaft strength test (Test C)
18 - 5.2.4 Cyclic test (Test D)
19 - 5.3 PRODUCTION TESTS
19 - 5.3.1 Manual actuator test (Test 1)
19 - 5.3.2 Disc strength test (Test 2)
19 - 5.3.3 Seat test (Test 3)
19 - 5.3.4 Body test (Test 4)
19 - 5.3.5 Disc strength reverse test (Test 5)
19 - 5.3.6 Seat reverse test (Test 6)
20 - 5.3.7 Functional test (Test 7)
21 - SECTION 6 MARKING AND PACKAGING
21 - 6.1 BODY MARKINGS
21 - 6.2 DIRECTION OF CLOSURE FOR HANDWHEELS AND CAPS
21 - 6.3 PACKAGING
22 - APPENDIX A - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
22 - A1 SCOPE
22 - A2 RELEVANCE
22 - A3 PRODUCT CERTIFICATION
22 - A4 DEFINITIONS
22 - A4.1 Valve batch
22 - A4.2 Production batch
22 - A4.3 Lot
23 - A4.4 Sample
23 - A4.5 Sampling plan
23 - A4.6 Batch release test (BRT)
23 - A4.7 Type testing (TT)
23 - A5 MINIMUM SAMPLING AND TESTING FREQUENCY PLAN
23 - A5.1 General
23 - A5.2 Type testing
23 - A5.3 Batch release testing
23 - A5.4 Retesting
27 - APPENDIX B - PURCHASING GUIDELINES
27 - B1 GENERAL
27 - B2 INFORMATION TO BE SUPPLIED BY THE PURCHASER
31 - APPENDIX C - REFERENCED DOCUMENTS
33 - APPENDIX D - ALTERNATIVE MATERIAL REQUIREMENTS
34 - APPENDIX E - ALTERNATIVE COATING REQUIREMENTS - TWO-PACK HIGH-BUILD EPOXY COATING
34 - E1 SCOPE
34 - E2 SURFACE PREPARATION
34 - E3 MATERIALS
34 - E4 APPLICATION AND FINISH

Specifies requirements for manually operated resilient-seated double-flanged butterfly valves for waterworks purposes, Classes 10, 16, 21 and 35, with a maxiumum operating temperature of 40 degrees Celsius.

This Standard specifies requirements for Classes 10, 16, 21 and 35, manually operated resilient-seated double-flanged butterfly valves for waterworks purposes, with a maximum operating temperature of 40C. This standard covers the following: (a) Manual actuators, gearboxes and standard spindle caps. (b) Water supply applications including potable water and recycled water as well as screened wastewater. (c) Valves of nominal size: (i) Seal-on-disc DN 300 to DN 2000.(ii) Seal-in-body: DN 80 to 2000.(iii) Seal-on-body: DN 80 to 2000. (d) The capability of the valves to be fitted with electric, hydraulic or pneumatic actuators and to be operated using portable actuators. Class 35 valves are only supplied with Ring Body Flanges while Class 21 may also be supplied with Ring Body Flanges. Means for demonstrating compliance with this Standard are given in Appendix A. NOTE: See Appendix B for purchasing requirements that should be agreed upon at time of inquiry or order.

First published as AS 4795-2002.