Fig. (2) Test circuit based on IEC60534-2-3, JIS B 2005 Test range Equipment for test Thermometer Restrictor in the upstream side Restrictor in the downstream side Flow meter Pressure tap Pressure tap 2d . 20d . 10d 6d Example 1) Find the pressure differential when water 15 [L/min] runs through a solenoid valve with an Av = 45 x 10.6 [m2]. Since Q0 = 15/45 = 0.33 [L/min], according to Chart (1), if reading ΔP when Q0 is 0.33, it will be 0.031 [MPa]. (4) Test method Attach a test equipment with the test circuit shown in Fig. (2). Next, pour water at 5 to 40°C, then measure the flow rate with a pressure differential of 0.075 MPa. However, the pressure differential needs to be set with a large enough difference so that the Reynolds number does not go below a range of 4 x 104. By substituting the measurement results for formula (1) to figure out Av. Chart (1) Flow-rate characteristics 0.001 0.002 0.003 0.004 0.01 0.02 0.03 0.04 0.1 3 2 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Water flow rate Q0 [L/min] (when Av = 1 x 10.6 [m2]) Temperature [°C] The chart above is calculated using the Antoine equation. 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 100 110 120 130 140 150 160 170 180 190 200 210 220 Pressure [MPa] Pressure differential ΔP [MPa] Example 1 Upstream pressure P1 = 1 MPa P1 = 0.8 MPa P1 = 0.6 MPa P1 = 0.5 MPa P1 = 0.1 MPa P1 = 0.2 MPa P1 = 0.4 MPa P1 = 0.3 MPa Vapor Dome (Water) For Steam Series VXS22/23 184