Scope of ANSI B109.4 - '98 for Self-Operated Diaphragm Type Natural Gas Service Regulators
Contact: Ali Quraishi
"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."