Key Parameters (English) The following are typical technical parameters for the Fisher Type 749B Micro-Pressure Regulator. Category Parameter Description / Typical Values Pressure Ratings Maximum Inlet Pressure (P1) 15 psig (1.0 bar). Outlet Pressure (P2) Range Adjustable within very low ranges. Common models cover 2.0" w.c. to 10" w.c. (0.5 to 2.5 kPa) or 5.0" w.c. to 35" w.c. (1.2 to 8.7 kPa). Capacity Flow Coefficient (Cv) Very low, suitable for pilot and instrument flows. Example: Cv ~0.14. Maximum Flow (Natural Gas) Typically up to ~250 CFH (Cubic Feet per Hour), depending on inlet/outlet conditions. Connections & Size Pipe Size 1/4 inch NPT or 1/2 inch NPT inlet and outlet. End Connections Female NPT. Materials Body Material Aluminum. Internal Components Stainless Steel, Synthetic Rubber Diaphragm. Environment Operating Temperature Standard for indoor/outdoor conditions (e.g., -20°F to 150°F / -29°C to 66°C). Applicable Fluids Natural Gas, Propane, Air, and other non-corrosive, clean gases.
