Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Swing Body Material - Valves Carbon Steel Pipe or Tube Size 18 in Connection Type Flanged X Flanged Cracking Pressure 0.09 psi Max Temp - Valves 850 Degrees F Max Water Pressure - Valves 65 psi Seat Material Metal Application - Valves Non Corrosives Oil Pipeline Steam Water Length 38 1/2 in Standards ASME B16.34 ASME Class 150