B109.4 Standard, Self-Operated Diaphragm-Type Natural Gas Service Regulators For Nominal Pipe Size 1-1/4 Inches (32 mm) and Small With Outlet Pressures of 2 psi (13.8 kPa) and Less (ANSI B109.4-2021), Includes Errata 1 (2022)
B109 4个标准、自力式隔膜式天然气服务调节器 适用于标称管道尺寸为1-1/4英寸（32 mm）及以下的小型管道 出口压力为2 psi（13.8 kPa）及以下（ANSI B109.4-2021）