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Figure 115: Available Water Pressure 4. Select the proper valve size from the flowcharts by locating a point on a chart that satisfies the flow, the head pressure rise above opening point, and the pressure drop across the valve. Metric Conversions Use these equations to convert between U.S. and S.I. units. • 1 dm 3 /s = 3.6 m 3 /h = 15.9 U.S. gal. /min. = 13.2 U.K. gal. /min. • 1 bar = 100 kPa = 0.1 MPa = 1.02 kg/cm 2 = 0.987 atm = 14.5 psig 278 Refrigeration Products Catalog