Normally Closed (N.C.) Size Port size Orifice diameter (mmo) Model Operating pressure range q Used with vacuum (Pa・abs) w Used with pressure (MPa・G) 0.1 to atmospheric pressure 2 3 5 4 7 5 8 10 10 1/8, 1/4 1/4, 3/8 1/4, 3/8 1/2 1 2 3 C [dm3/(s・bar)] b 0.23 0.41 0.62 0.62 1.08 0.75 1.58 2.21 2.21 0.63 0.68 0.39 0.52 0.44 0.55 0.33 0.64 0.39 0.63 1.05 2.20 1.90 3.99 1.96 5.67 5.74 8.42 Cv Flow-rate characteristics VX214 VX224 VX234 300 300 300 460 460 580 580 580 630 0 to 1.0 0 to 0.6 0 to 0.2 0 to 1.0 0 to 0.15 0 to 1.0 0 to 0.3 0 to 0.1 0 to 0.1 Normally Open (N.O.) Note) Weight of grommet type. Add 10 g for conduit type, 30 g for DIN terminal type, 60 g for conduit terminal type respectively. Size Port size Orifice diameter (mmo) Model Operating pressure range q Used with vacuum (Pa・abs) w Used with pressure (MPa・G) 0.1 to atmospheric pressure 2 3 5 4 7 5 8 1/8, 1/4 1/4, 3/8 1/4, 3/8 1 2 3 C [dm3/(s・bar)] b 0.23 0.41 0.62 0.62 1.08 0.75 1.58 0.63 0.68 0.39 0.52 0.44 0.55 0.33 0.63 1.05 2.20 1.90 3.99 1.96 5.67 Cv Flow-rate characteristics VX244 VX254 VX264 320 320 320 490 490 620 620 0 to 0.9 0 to 0.45 0 to 0.2 0 to 0.8 0 to 0.15 0 to 0.8 0 to 0.3 1 2 1 2 1 2 1 2 1.0 Max. system pressure (MPa) 1.0 Max. system pressure (MPa) . This valve can also be used with air. (Refer to the valve specifications for air.) 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. Series VX21/22/23 For Medium Vacuum (0.1 Pa・abs or more) Single Unit Model/Valve Specifications Symbol (Application example) Symbol (Application example) N.C. N.O. w Used with pressure q Used with vacuum w Used with pressure q Used with vacuum Weight (g) Note) Weight (g) Note) 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 Valve Leakage Rate Ambient temperature (°C) .20 to 60 Fluid temperature (°C) 1 to 60 Note) 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 Note) With no freezing Internal Leakage External Leakage Note) Leakage (10.6 Pa・m3/sec) is the value at differential pressure 0.1 MPa and ambient temperature 20°C. 10