Key Parameters Category Parameter Description / Typical Values Pressure Ratings Maximum Inlet Pressure (P1) 125 psig (8.6 bar). Outlet Pressure (P2) Range Adjustable via spring selection. Common ranges span from 3.5" w.c. to 60 psig (approx. 0.87 kPa to 4.1 bar). Capacity Flow Coefficient (Cv) High Cv for its size. For example, a 2" R122H 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 Overpressure Protection (OPP) Integral Internal Relief Valve is a standard or very common optional feature, providing built-in overpressure protection. Environment Operating Temperature Standard for outdoor gas service (e.g., -20°F to 150°F / -29°C to 66°C).
