Solenoid Valve Flow-rate Characteristics (How to indicate flow-rate characteristics) 1. Indication of Flow-rate Characteristics The flow-rate characteristics in equipment such as a solenoid valve, etc. are indicated in their specifications shown in Table (1). 2. Flow-rate Characteristics Note) Use this chart as a guide. In the case of finding an accurate flow rate, refer to pages 10 to 14. Corresponding equipment Pneumatic equipment Process fluid control equipment Indication by international standard C, b Av . Other indications . . Cv Conformed standards ISO 6358: 1989 JIS B 8390: 2000 IEC60534-2-3: 1997 JIS B 2005: 1995 Equipment: JIS B 8471, 8472, 8473 JIS B 8390: 2000 Equipment: JIS B 8373, 8374, 8375, 8379, 8381 ANSI/(NFPA)T3.21.3: 1990 Table (1) Indication of Flow-rate Characteristics Figures inside [ ] indicate the saturated steam holding heat (kcal/kg). Figures inside ( ) indicate the saturation temperature (°C). For Saturated Steam How to read the chart The sonic range pressure to generate a flow rate of 400 kg/h is P1 Approx. 0.64 MPa for o15 orifice (VXS224�ｭ-04). The holding heat slightly differs depending on the pressure P1, but at 400 kg/h it is approx. 25900 kcal/h. Downstream pressure of valve (P2) MPa Upstream pressure of valve P1 Approx.1.0 MPa 1.0 0.9 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Subsonic Sonic Critical pressure Flow rate Q kg/h 50 100 150 50 100 150 200 250 100 200 300 400 500 600 200 400 600 800 1000 200 400 600 800 1000 1200 1400 200 [663] (183) [664] (179) [662] (174) [661] (170) [660] (164) [658] (158) [656] (151) [654] (143) [650] (133) [646] (120) VXS2230-02 VXS2230-03 VXS2240-04 VXS2350-06 VXS2360-10 o10 o10 o15 o20 o25 S Cv . 182