146 PERFORMANCE OF SWING CHECK VALVE, BALL CHECK VALVE, AND BALL FOOT VALVE PERFORMANCE OF WAFER CHECK VALVE SWING CHECK VALVE BALL CHECK VALVE, BALL FOOT VALVE mm inch VERTICAL PIPING HORIZONTAL PIPING VERTICAL PIPING HORIZONTAL PIPING WHEN FULLY SEALED WHEN AIR PASSES WHEN FULLY SEALED WHEN AIR PASSES WHEN FULLY SEALED WHEN AIR PASSES WHEN FULLY SEALED WHEN AIR PASSES 15 1/2 EPDM 0.02{0.2} 0.01{0.1} 0.02{0.2} 0.01{0.1} 0.02{0.2} 0.005{0.05} 0.02{0.2} 0.001{0.01} PTFE 0.03{0.3} 0.01{0.1} 0.03{0.3} 0.01{0.1} - - - - 20 3/4 EPDM 0.02{0.2} 0.01{0.1} 0.02{0.2} 0.01{0.1} 0.03{0.3} 0.005{0.05} 0.03{0.3} 0.001{0.01} PTFE 0.035{0.35} 0.01{0.1} 0.035{0.35} 0.01{0.1} - - - - 25 1 EPDM 0.03{0.3} 0.01{0.1} 0.035{0.35} 0.01{0.1} 0.03{0.3} 0.005{0.05} 0.03{0.3} 0.001{0.01} PTFE 0.05{0.5} 0.01{0.1} 0.06{0.6} 0.01{0.1} - - - - 40 1 1/2 EPDM 0.03{0.3} 0.01{0.1} 0.035{0.35} 0.01{0.1} 0.03{0.3} 0.01{0.1} 0.03{0.3} 0.002{0.02} PTFE 0.05{0.5} 0.01{0.1} 0.06{0.6} 0.01{0.1} - - - - 50 2 EPDM 0.03{0.3} 0.01{0.1} 0.035{0.35} 0.01{0.1} 0.03{0.3} 0.01{0.1} 0.03{0.3} 0.002{0.02} PTFE 0.05{0.5} 0.01{0.1} 0.06{0.6} 0.01{0.1} - - - - 65 2 1/2 EPDM 0.03{0.3} 0.01{0.1} 0.035{0.35} 0.01{0.1} - - - - PTFE 0.05{0.5} 0.01{0.1} 0.06{0.6} 0.01{0.1} - - - - 80 3 EPDM 0.035{0.35} 0.01{0.1} 0.04{0.4} 0.01{0.1} 0.02{0.2} 0.01{0.1} 0.02{0.2} 0.002{0.02} PTFE 0.055{0.55} 0.01{0.1} 0.06{0.6} 0.01{0.1} - - - - 100 4 EPDM 0.035{0.35} 0.01{0.1} 0.04{0.4} 0.01{0.1} 0.02{0.2} 0.01{0.1} 0.02{0.2} 0.002{0.02} PTFE 0.06{0.6} 0.01{0.1} 0.065{0.65} 0.01{0.1} - - - - 125 5 EPDM 0.035{0.35} 0.01{0.1} 0.04{0.4} 0.01{0.1} - - - - PTFE 0.06{0.6} 0.01{0.1} 0.065{0.65} 0.01{0.1} - - - - 150 6 EPDM 0.04{0.4} 0.015{0.15} 0.045{0.45} 0.01{0.1} - - - - PTFE 0.065{0.65} 0.015{0.15} 0.07{0.7} 0.01{0.1} - - - - 200 8 EPDM 0.04{0.4} 0.02{0.2} 0.045{0.45} 0.015{0.15} - - - - PTFE 0.07{0.7} 0.02{0.2} 0.07{0.7} 0.015{0.15} - - - - Min. Pressure Unit : MPa{kgf/cm2}, Normal Temperature STANDARD MODEL SPRING MODEL mm inch VERTICAL PIPING HORIZONTAL PIPING VERTICAL PIPING HORIZONTAL PIPING MIN. SEALING PRESSURE OPERATING PRESSURE MIN. SEALING PRESSURE OPERATING PRESSURE MIN. SEALING PRESSURE OPERATING PRESSURE MIN. SEALING PRESSURE OPERATING PRESSURE 80 3 0.021 {0.21} 0.0007 {0.007} 0.021 {0.21} 0.00007 {0.0007} 0.021 {0.21} 0.0014 {0.014} 0.021 {0.21} 0.00007 {0.0007} 100-300 4-12 0.007 {0.07} 0.0007 {0.007} 0.007 {0.07} 0.00007 {0.0007} 0.007 {0.07} 0.0014 {0.014} 0.007 {0.07} 0.00007 {0.0007} Min. Sealing Pressure & Operating Pressure (Hydraulic Pressure) Unit : MPa{kgf/cm2} [Vertical piping] Measure the minimum pressure required for air to pass through or to be sealed. [Horizontal piping] [Vertical piping] [Horizontal piping] Fluid flow Fluid flow Arrow TEST METHOD TEST METHOD