Series VXD Port size 2 o50 Cv = 49 Port size 1 1/2 o40 Cv = 31 Port size 1 1/4 o35 Cv = 23 Port size 1 o25 Cv = 12.5 Port size 3/4 o20 Cv = 9.5 Port size 1/2 o15 Cv = 5.5 Port size 3/8 o15 Cv = 4.5 Port size 3/8,1/2 o10 Cv = 2.4 Port size 1/4 o10 Cv = 1.9 1,000 500 400 300 200 100 50 40 30 20 10 Flow rate Q [L/min] 0.02 0.03 0.032 0.04 0.05 0.055 0.06 0.07 0.08 0.09 0.1 0.16 0.2 0.3 0.4 0.5 Pressure differential ΔP = (P1 . P2) [MPa] For Water How to read the graph The pressure differential when water with flow rate of 100 L/min is applied is as follows. For a o15 orifice (VXD242 Port size 1/2), ΔP . 0.16 MPa, for a o20 orifice (VXD252), ΔP . 0.055 MPa, for a o25 orifice (VXD262), ΔP . 0.032 MPa A 146