AGA XQ199802 : 1998

DISCLAIMERS AND COPYRIGHT
PREFACE
HISTORY OF DEVELOPMENT OF THE STANDARD
ACKNOWLEDGEMENTS
ACCREDITED STANDARDS COMMITTEE B109
TABLE OF CONTENTS
1.0 Scope
2.0 Definitions
3.0 General
4.0 Design Requirements
     4.1 Regulator Valve Body
     4.2 Diaphragm Casing Assembly
     4.3 Diaphragm
     4.4 Loading Spring
     4.5 Valve Linkage and Disk
     4.6 Orifice
     4.7 Exterior Surface
     4.8 Vent
     4.9 Markings
5.0 Qualification Test for Service Regulator
     Performance
     5.1 General
     5.2 Test Equipment
     5.3 Test Procedures
APPENDIX A: GUIDELINES FOR PRESENTATION OF
             REGULATOR PERFORMANCE DATA
APPENDIX B: SI (METRIC) SYMBOLS
APPENDIX C: US (INCH-POUND) SYMBOLS
FORM FOR PROPOSALS ON ANSI B109.4

A basic standard for the safe and reliable operation, and the substantial and durable construction of self-operated diaphragm type natural gas service regulators, for nominal pipe size of 1-1/4 inches and smaller with outlet pressure of 14 inch water column or less.