AS 2638.2-2006

1 - AS 2638.2-2006 GATE VALVES FOR WATERWORKS PURPOSES - RESILIENT SEATED
4 - PREFACE
5 - CONTENTS
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 SCOPE
7 - 1.2 REFERENCED DOCUMENTS
7 - 1.3 DEFINITIONS
7 - 1.3.1 Allowable operating pressure (AOP)
7 - 1.3.2 Allowable site test pressure (ASTP)
7 - 1.3.3 Bulkhead test
8 - 1.3.4 Bypass arrangement
8 - 1.3.5 Coating
8 - 1.3.6 Coating defect
8 - 1.3.7 Distortion
8 - 1.3.8 DN (nominal size)
8 - 1.3.9 Effective length
8 - 1.3.10 Face to face dimensions
8 - 1.3.11 Free-end seat test
8 - 1.3.12 Maximum allowable gearbox input torque
8 - 1.3.13 Maximum allowable operating pressure (MAOP)
8 - 1.3.14 Maximum functional test torque
8 - 1.3.15 Maximum operator input torque
8 - 1.3.16 Maximum possible input torque
9 - 1.3.17 Maximum operating temperature
9 - 1.3.18 Minimum strength test torque
9 - 1.3.19 Non-rising spindle design
9 - 1.3.20 Pressure Classification (PN)
9 - 1.3.21 Rising spindle design
9 - 1.3.22 Type test
9 - 1.4 DESIGNATION OF SIZE
9 - 1.5 ALLOWABLE PRESSURES
10 - SECTION 2 MATERIALS AND COMPONENTS
10 - 2.1 MATERIALS
10 - 2.2 DEZINCIFICATION-RESISTANT MATERIALS
10 - 2.3 CONTAMINATION OF WATER
10 - 2.4 O-RINGS (ELASTOMERIC TOROIDAL SEALING RINGS)
12 - SECTION 3 DESIGN
12 - 3.1 GENERAL
12 - 3.2 DIMENSIONS
12 - 3.2.1 General
12 - 3.3 END CONNECTIONS
12 - 3.3.1 General
12 - 3.3.2 Flanged ends
12 - 3.3.3 Socket ends
12 - 3.3.4 Spigot ends
12 - 3.3.5 Shouldered or grooved ends
12 - 3.4 GATE
12 - 3.4.1 Coating
12 - 3.4.2 Gate guides
12 - 3.4.3 Gate travel
13 - 3.5 COMPONENT JOINTING
13 - 3.5.1 Connections
13 - 3.5.2 Fasteners
13 - 3.6 WATERWAY
13 - 3.7 SPINDLE
13 - 3.7.1 Spindle diameter
13 - 3.7.2 Spindle thread
13 - 3.7.3 Spindle sealing
13 - 3.7.4 Thrust collar
13 - 3.7.5 Spindle seal retainer
14 - 3.8 OPERATION
14 - 3.8.1 General
14 - 3.8.2 Spindle cap and key
14 - 3.8.3 Extension spindle
14 - 3.8.4 Handwheels
14 - 3.8.5 Direction of closure
14 - 3.9 LIFTING DEVICES
14 - 3.10 SUPPORT FEET
14 - 3.11 BYPASS ARRANGEMENTS
19 - SECTION 4 COATINGS
19 - 4.1 GENERAL
19 - 4.2 DESIGN
20 - SECTION 5 TESTING
20 - 5.1 TYPE TESTS
20 - 5.1.1 General
20 - 5.1.2 Strength test (thrust collar, spindle, nut and cap) (Test A)
20 - 5.1.3 Body pressure test (Test B)
21 - 5.1.4 Gate strength test (Test C)
21 - 5.1.5 Torque test (Test D)
21 - 5.1.6 Valve seat test (Test E)
21 - 5.1.7 Sensitivity test (Test F)
21 - 5.1.8 Functional test (Test G)
21 - 5.1.9 Spindle seal replacement or repair test (Test H)
21 - 5.1.10 Final inspection
21 - 5.1.11 Cyclic flow test (Test I)
22 - 5.1.12 Endurance cyclic flow test (Test J)
23 - 5.1.13 Gate rubber adhesion test (Test K)
23 - 5.1.14 Strength test (valve key) (Test L)
23 - 5.1.15 Strength test (spindle extension) (Test M)
23 - 5.2 PRODUCTION TESTS
23 - 5.2.1 General
23 - 5.2.2 Body test (Test 1)
24 - 5.2.3 Valve seat test (Test 2)
24 - 5.2.4 Coating tests
25 - SECTION 6 GEARBOXES
25 - 6.1 DESIGN
25 - 6.1.1 Gearbox
25 - 6.1.2 Gearbox selection
25 - 6.1.3 Geared valves
25 - 6.2 COATINGS
25 - 6.3 MARKINGS
26 - SECTION 7 MARKING AND PACKAGING
26 - 7.1 BODY MARKINGS
26 - 7.2 VALVE KEY AND SPINDLE EXTENSION MARKINGS
26 - 7.3 DIRECTION OF CLOSURE FOR HANDWHEELS AND CAPS
26 - 7.4 PACKAGING
27 - APPENDIX A - MEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD
27 - A1 SCOPE
27 - A2 RELEVANCE
27 - A3 PRODUCT CERTIFICATION
27 - A4 DEFINITIONS
27 - A4.1 Batch release test (BRT)
27 - A4.2 Lot
27 - A4.3 Production batch
28 - A4.4 Sample
28 - A4.5 Sampling plan
28 - A4.6 Type testing (TT)
28 - A4.7 Valve batch
28 - A5 TESTING
28 - A5.1 General
28 - A5.2 Retesting
31 - APPENDIX B - PURCHASING GUIDELINES
31 - B1 GENERAL
31 - B2 INFORMATION TO BE SUPPLIED BY THE PURCHASER
33 - B3 INFORMATION TO BE SUPPLIED BY THE MANUFACTURER
33 - B4 MATTERS FOR AGREEMENT BETWEEN THE PURCHASER AND THE MANUFACTURER
34 - APPENDIX C - REFERENCED DOCUMENTS
36 - APPENDIX D - ALTERNATIVE MATERIAL REQUIREMENTS
37 - APPENDIX E - GUIDELINES FOR GEARBOX SELECTION AND APPLICATION
37 - E1 GENERAL
37 - E2 INFORMATION REQUIRED FOR GEARBOX SELECTION
37 - E3 TORQUE REQUIREMENTS OF A VALVE
37 - E3.1 General
38 - E3.2 Torque to seal
38 - E3.3 Running torque
38 - E4 STANDARD GEARBOX RATIOS
38 - E5 GEAR RATIO SELECTION
39 - E6 FINAL CHECK

Sets out requirements for PN 16 and PN 25 metal-bodied resilient-seated gate valves for waterworks purposes, with a maximum operating temperature of 40 Degrees Celsius.

This Standard specifies requirements for PN 16 and PN 25 metal-bodied resilient-seated gate valves for waterworks purposes, with a maximum operating temperature of 40°C. This Standard is applicable to the following versions: (a) Valves of nominal sizes DN 80 to DN 750 with inside screw and non-rising spindle design, operated by a removable key, with or without a gearbox, for buried applications.(b) Valves of nominal size DN 80 to DN 750 with inside screw and non-rising spindle design, operated by a hand wheel, with or without a gearbox, for aboveground applications.(c) Valves of nominal size DN 80 to DN 300 with outside screw and rising spindle design, operated by a hand wheel, for aboveground applications where the position of the gate is required to be visible.(d) Valves of nominal sizes DN 450 to DN 750 with an integral bypass arrangement.The design criteria of the valve and fasteners should be based on a minimum life expectancy of 50 years.Means for demonstrating compliance with this Standard are given in Appendix A.note: Purchasing guidelines are given in Appendix B.

Originated as AS 2638-1983.
Third Edition 1991.
AS 2638-1991 revised and redesignated in part as AS 2638.2-1999.
Third Edition 2006.