![]() To convert to m3/hr to litres/minute multiply by 0.278Ĭhoose the appropriate calculator and fill in the missing information and the answer will be calculated by the spreadsheet. These calculators have been produced with ACL valves in mind so uses m3/hr as the units of flow rate. Here is a guide to the specific gravity and relative density for various common liquids and gases. In this case assume that 10% of the inlet pressure is being lost. If however the valve has a complex system of pipework, with elbows and/or spray nozzles being used these will affect the flow - in this case unless the customer has a pressure gauge or sensor in the system just after the valve then it’s very difficult to accurately assess the actual pressure drop across the valve. The pressure drop is tricky, if the valve is being used to control mains water filling a tank and is simply discharging into the tank through a very short (or no) outlet pipe then at the outlet of the valve the water will be at zero pressure - although it might have lots of velocity) all the pressure from the inlet is being “lost” across the valve. Mains pressure water converts to 4 -6 bar (10 bar max), 2 meters head of water = 0.2 bar, a bucket filling in a minute is 9-10 litres per minute = 0.6 cubic meters per hour. To use these calculators some information must be known.Įg. Calculating the pressure drop for a valve.However to make this easier and save you from having to do the maths we have created the Beta Valve flow rate calculators split into three media groups - liquid, air and gases.Įach group has three calculators that use the appropriate calculations for that media type:Ĭalculating the required Kv for a valve to give the required flow. If the fluid is a liquid its specific gravity or if it’s a gas its relative density.įor further information see our Flow Calculation - (Kv) article. The diameter and length of pipe work on the inlet and outlet of the valve.ģ. The difference between the inlet pressure and the outlet pressure (otherwise known as the pressure drop or delta p or dp).Ģ. The flow of a fluid through any a valve (or any pipe fitting) is dictated by a number of factors:ġ. ![]()
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