Standard

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AS 4629.2:2022

[Current]

Automatically operated valves for use with gas, Part 2: Vent valves

AS 4692.2:2022 specifies the minimum safety and performance requirements for vent valves up to 150 mm nominal size and up to a maximum rated working pressure of 2.6 MPa for use with natural gas, town gas, tempered liquefied petroleum gas and liquefied petroleum gas.

Published: 16/12/2022

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

2 Design and construction

2.1 Materials

2.1.1 General

2.1.2 Suitability

2.1.3 Contact with gas

2.1.4 Melting point

2.1.5 Copper-containing alloys

2.2 Construction

2.2.1 General

2.2.2 Castings and hot pressings

2.2.3 Sealing of porous castings or cracks

2.2.4 Assembled device to be clean

2.2.5 Accidental displacement of parts

2.2.6 Prevention of accidental shift after calibration

2.2.7 Attachment of knobs, handles, dials and pointers

2.2.8 Springs

2.2.9 Securing of parts

2.2.10 Sharp edges

2.2.11 Holes for assembly or mounting

2.2.12 Permanent sealing of non-functional holes

2.2.13 Self-tapping screws

2.2.14 Adjustments by the user

2.2.15 Devices that indicate position or open

2.3 Design

2.3.1 Normally open operation

2.3.2 Vent valves

2.3.3 Proof-of-closure switches

2.3.4 Locking device

2.3.5 Connections

2.3.6 Lubricant not required for safe opening of valve

2.4 Markings

2.4.1 General

2.4.2 Marking of electrical connections

2.4.3 Durability of markings

2.5 Instructions

3 Performance requirements

3.1 General

3.1.1 Mounting positions

3.1.2 Declared temperature range

3.2 Opening time

3.3 Opening pressure

3.4 Gas leakage

3.4.1 Hydrostatic safety test

3.4.2 External leakage

3.4.3 Internal leakage — Forward flow

3.4.4 Internal leakage — Reverse flow

3.5 Flow capacity

3.6 Actuation medium

3.6.1 Voltage variation

3.6.2 Pressure variation

3.7 Mechanical strength

3.7.1 Resistance to applied torque

3.7.2 Resistance to applied bending moments

3.8 Durability

3.8.1 Cycling test

3.8.2 Resistance to humidity

3.8.3 Electrical load connections

3.8.4 Electrically operated valves

3.8.5 Operation of switches after durability test

Appendix A

Appendix B

B.1 General

B.2 Test medium and gases

B.2.1 Test medium

B.2.2 Test gases

B.3 Samples

B.4 Lubricants

B.5 Testing sequence

Appendix C

C.1 Non-metallic materials test

C.1.1 Scope

C.1.2 Method

C.1.3 Apparatus

C.1.4 Preparation of apparatus

C.1.5 Materials

C.1.6 Procedure

C.1.7 Test report

C.2 Heat resistance test

C.2.1 Scope

C.2.2 Method

C.2.3 Apparatus

C.2.4 Preparation of apparatus

C.2.5 Procedure

C.2.6 Test report

C.3 Position-indicating switches test

C.3.1 Scope

C.3.2 Method

C.3.3 Apparatus

C.3.4 Preparation of apparatus

C.3.5 Procedure

C.3.6 Test report

C.4 Flow capacity test

C.4.1 Scope

C.4.2 Method

C.4.3 Apparatus

C.4.4 Preparation of apparatus

C.4.5 Materials

C.4.6 Procedure

C.4.7 Test report

C.5 Markings and labels test

C.5.1 Scope

C.5.2 Method

C.5.3 Apparatus

C.5.4 Materials

C.5.5 Procedure

C.5.6 Test report

C.6 External leakage test

C.6.1 Scope

C.6.2 Method

C.6.3 Apparatus

C.6.4 Preparation of apparatus

C.6.5 Materials

C.6.6 Procedure

C.6.7 Test report

C.7 Hydrostatic strength test

C.7.1 Scope

C.7.2 Method

C.7.3 Apparatus

C.7.4 Preparation of apparatus

C.7.5 Procedure

C.7.6 Test report

C.8 Internal leakage (forward flow) test

C.8.1 Scope

C.8.2 Method

C.8.3 Apparatus

C.8.4 Preparation of apparatus

C.8.5 Materials

C.8.6 Procedure

C.8.7 Test report

C.9 Internal leakage (reverse flow) test

C.9.1 Scope

C.9.2 Method

C.9.3 Apparatus

C.9.4 Preparation of apparatus

C.9.5 Materials

C.9.6 Procedure

C.9.7 Test report

C.10 Opening against pressure differential test

C.10.1 Scope

C.10.2 Method

C.10.3 Apparatus

C.10.4 Preparation of apparatus

C.10.5 Materials

C.10.6 Procedure

C.10.7 Test report

C.11 Torque test

C.11.1 Scope

C.11.2 Method

C.11.3 Apparatus

C.11.4 Preparation of apparatus

C.11.5 Materials

C.11.6 Procedure

C.11.7 Test report

C.12 Bending moment test

C.12.1 Scope

C.12.2 Method

C.12.3 Apparatus

C.12.4 Preparation of apparatus

C.12.5 Procedure

C.12.6 Test report

C.13 Durability (cycling) test

C.13.1 Scope

C.13.2 Method

C.13.3 Apparatus

C.13.4 Materials

C.13.5 Procedure

C.13.6 Test report

C.14 Durability (moisture resistance) test

C.14.1 Scope

C.14.2 Method

C.14.3 Apparatus

C.14.4 Materials

C.14.5 Procedure

C.14.6 Test report

C.15 Durability (continuous energizing) test

C.15.1 Scope

C.15.2 Method

C.15.3 Apparatus

C.15.4 Materials

C.15.5 Procedure

C.15.6 Test report

C.16 Flow discharge test

C.16.1 Scope

C.16.2 Method

C.16.3 Apparatus

C.16.4 Preparation of apparatus

C.16.5 Materials

C.16.6 Procedure

C.16.7 Test report

Appendix D

Bibliography

Cited references in this standard

Content history

AS 4629-2005

[Superseded]

DR AS 4629.2:2022

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