Body Sizes and End Connection Styles3/4, 1, or 2: NPT end connections NPS 1 or 2 / DN 25 or 50: CL150 RF, CL300 RF, CL600 RF flanged end connections Maximum Inlet PressureNPT Steel: 2000 psig / 138 bar Flanged Steel: 1500 psig / 103 bar Ductile Iron: 1000 psig / 69,0 bar Outlet Pressure Range5 to 500 psig / 0,34 to 34,5 bar in six ranges Pressure RegistrationType 627, 627H or 627R: Internal Type 627M, 627HM, 627BM, 627BHM, 627MR or 627BMR: External through 1/4 NPT internal control line connection in the diaphragm case Temperature Capabilities-40° to 180°F / -40° to 82°C Approximate WeightsDuctile Iron or Steel Casings: 10 pounds / 5 kg Aluminum Casings: 6.3 pounds / 3 kg Hydrogen ConfigurationsThe 627 was validated for hydrogen service through extensive high pressure hydrogen testing to analyze sealing performance and material compatibility. For additional details regarding the evaluation and testing, please refer to “Blending Hydrogen with Natural Gas : Technical Factors to Consider”.