ANSI B109.4-1998 (R2008)

This standard shall apply to the minimum design, material, performance and testing requirements of 1 1/4; inches (32 mm) and smaller self-operated diaphragm-type natural gas service regulators operating at inlet pressures up to 125 psig (861.8 kPa). These regulators are used to control the gas delivery pressure to pressures at a maximum 14 inches water column (3.48 kPa). This standard shall apply only to regulators manufactured after the approval date of this standard.