By measuring the change in pressure, the flow rate can be determine as in various flow measurement devices such as venturi meters , venturi nozzles and orifice plates. Bufret Lignende Oversett denne siden Venturi Flowmeters. The differential producing flowmeter or Venturi has a long history of uses in many applications.
Due to its simplicity and dependability, the Venturi is among the most common flowmeters. With no moving parts or abrupt flow restrictions, the Venturi can measure fluid flowrates with a minimal total pressure . Units in Venturi Flow Meter calculator: cm=centimeter, ft=foot, g=gram, gal=U. Diagram of Venturi Flow Meter.
Topics: Introduction Equations Discharge Coefficients Error Messages . Calculate the flowrate measured by a venturi -style flowmeter. Venturi tubes are available in sizes up to 7 and can pass to more flow than an orifice with the same pressure drop. The initial cost of a venturi meter is high, so they are primarily used on larger flows or on more difficult . In the Venturi Tube the fluid flowrate is measured by reducing the cross sectional flow area in the flow path, . The orifice, nozzle and venturi flow rate meters use the Bernoulli Equation to calculate fluid flow rate using pressure difference through obstructions in the flow. A practical instrument which makes use of the Bernoulli effect and a manometer pressure gauge is the venturi flowmeter.
The illustration shows that you can express the fluid velocity vat the inlet of the device in terms of the difference in pressure measured by the manometer. Note that it presumes that . This low- pressure metering device provides constant accuracy, greater capacity, high- pressure . The Venturi flow meter can be built to meet the highest pressure and temperature specifications often limited in other flow meter technologies. The Venturi Model VILPL (Low Pressure Loss Venturi Design Insert) is a Venturi Nozzle design differential pressure flow device. The Preso VILPL low-loss design is also available in the stainless steel.
The all 3stainless steel construction provides excellent corrosion and temperature resistance, while the short form style . A venturi tube contains a throat which is smaller in a diameter to the pipeline, into which it fits. The restriction diameter should not be less than 0. D where D is the nominal bore diameter of the pipe. When the fluid flows through it, the pressure at the throat is lower than the upstream pressure . This pressure drop is measured using a differential pressure sensor and when calibrated this pressure drop becomes a measure of flow rate. Flexible connections enable the meter to be used in vertical or horizontal applications.
It is available in line sizes from to and can handle vacuum and pressure applications. Other applications include filter monitoring, clean room positive pressure indication, and fan pressure indication. This applies equally to gases and liquids (e.g. carbon dioxide, nitrogen, liquors etc.) which are an integral part of the process, or to compressed air, water or steam which . Bd – Illustration of the differential pressure flow measuring principle.
Amity Flow specializes in the design, engineering and production of Venturi Meters.