Technical Specifications Parameter Specification Nominal Diameter DN25 (1 inch) Pressure Class 150 LB (ANSI B16.5) Flange Type Raised Face (RF) - standard Max Working Pressure 285 psi @ 100°F (19.7 bar) Bolt Circle Diameter ≈ 3.25 inches (82.6 mm) - for 150LB RF flange Flange Thickness ≈ 0.56 inches (14.3 mm) - for 150LB RF flange Number of Bolts 4 - for 150LB DN25 flange Bolt Size 0.62 inch (15.7 mm) diameter