Size Orifice diameter (mmo) Model Maximum operating pressure differential (MPa) 1.0 0.6 0.2 1.0 0.15 1.0 0.3 2 3 5 4 7 5 7 1 2 3 C [dm3/(s・bar)] b 0.23 0.41 0.62 0.62 1.08 0.75 1.08 0.63 0.68 0.39 0.52 0.44 0.55 0.44 0.63 1.05 2.20 1.90 3.99 1.96 3.99 Cv Flow-rate characteristics Normally Closed (N.C.) VX2A4 VX2B4 VX2C4 Normally Open (N.O.) Size Orifice diameter (mmo) Model Maximum operating pressure differential (MPa) 0.9 0.45 0.2 0.8 0.15 0.8 0.3 2 3 5 4 7 5 7 1 2 3 C [dm3/(s・bar)] b 0.23 0.41 0.62 0.62 1.08 0.75 1.08 0.63 0.68 0.39 0.52 0.44 0.55 0.44 0.63 1.05 2.20 1.90 3.99 1.96 3.99 Cv Flow-rate characteristics VX2D4 VX2E4 VX2F4 1 (IN) 1 (IN) 2 (OUT) 1 (IN) 1 (IN) 2 (OUT) 1.0 Max. system pressure (MPa) 1.0 Max. system pressure (MPa) Symbol Model/Valve Specifications N.C. Series VX21/22/23 For Medium Vacuum (0.1 Pa・abs or more) Manifold . For other fluids, please contact SMC. Symbol N.O. Individual SUP type When the valve is closed, flow is blocked from port 1 to port 2. However, if the pressure in port 2 is higher than port 1, the valve will not be able to block the fluid and it will flow from port 2 to port 1. Fluid and Ambient Temperature Note) With no freezing Ambient temperature (°C) .20 to 60 Fluid temperature (°C) 1 to 60 Note) Valve Leakage Rate Internal Leakage Note) Leakage (10.6 Pa・m3/sec) is the value at differential pressure 0.1 MPa and ambient temperature 20°C. External Leakage FKM Seal material Leakage rate Note) 10.6 Pa・m3/sec or less FKM Seal material Leakage rate Note) 10.6 Pa・m3/sec or less Individual SUP type 12