Key Parameters Category Parameter Description / Typical Values Pressure Ratings Maximum Inlet Pressure (P1) 125 psig (8.6 bar) for standard models. Outlet Pressure (P2) Range Adjustable via spring. Common ranges are available, for example, from 3.5" w.c. to 60 psig (~0.87 kPa to 4.1 bar). Specific springs define the exact adjustable range. Capacity Flow Coefficient (Cv) High Cv values. For example, a 2" R222H can have a Cv of approximately 50. Size & Connections Pipe Size Typically 1/2 inch to 3 inches. End Connections Threaded (NPT) or Flanged (ANSI Class 125/150). Materials Body Material Cast Iron (standard). Internal Trim Stainless Steel, Brass. Safety Features Internal Overpressure Protection (OPP) Integral Internal Relief Valve is a standard or common optional feature on many models, providing overpressure protection as per code requirements. Environment Operating Temperature Standard for outdoor gas service (e.g., -20°F to 150°F / -29°C to 66°C).
