Series VX21/22/23 Flow-rate Characteristics 1 Note) Use this graph as a guide. In the case of obtaining an accurate flow rate, refer to pages 36 through to 40. How to read the graph The sonic range pressure to generate a flow rate of 400 L/min (ANR) is P1 . 0.2 MPa for a o4 orifice and P1 . 0.58 MPa for a o3 orifice. How to read the graph When a water flow of 2 L/min is generated, ΔP . 0.013 MPa for a valve with o3 orifice. For Air Downstream pressure of valve (P2) [MPa] 1.0 0.8 0.6 0.4 0.2 0 o2 o3 o4 o5 o7 o8 o10 (Connection: 1/4) o10 (Connection: 3/8, 1/2) Flow rate Q [L/min (ANR)] 50 100 150 200 250 300 350 400 100 200 300 400 500 1,000 400 600 600 800 1,000 1,200 200 1,400 350 700 400 700 1,000 1,300 500 700 700 1,000 Upstream pressure of valve P1 . 1.0 MPa Subsonic Sonic Critical pressure 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 For Water Flow rate Q [L/min] 30 20 10 543 2 1 0.1 0.001 (0.0018) (0.0054) 0.01 (0.013) 0.05 (0.07) Pressure differential ΔP = (P1 . P2) [MPa] o4, o5 o8 o7 o3 o2 o10 41