The role of flapper nozzle lies in its ability to generate a large output air pressure, by placing a small obstruction at the orifice (at the nozzle) of an incoming pneumatic signal. This trainer has a flapper nozzle, together with a pressure amplifier, suitably connected to a spring damper, and a spring compensator. This trainer not only used to draw the characteristics of a FLAPPER NOZZLE, but also highlights the application of a FLAPPER NOZZLE itself.
The Flapper Nozzle trainer is a pneumatic system. The air at fixed pressure enters a constriction (a partial obstruction) in its delivery path and enters a nozzle. The opening of the nozzle is larger than the constriction. When the flapper is moved away (usually one thousandth of an inch) from the nozzle, the pressure at the nozzle falls to a low value typically 2 to 3 psi. When the flapper is moved close to the nozzle, the pressure at he nozzle rises to the supply pressure. This pressure is now applied to a pressure amplifier, which in turn moves a beam. The purpose of this beam is to demonstrate the utility of a flapper nozzle experiment. The displacement of this moving beam is proportional to the pressure developed due to the positioning of the flapper from the nozzle.
This trainer is intended to demonstrate what a flapper nozzle is, and how it is used in typical pneumatic installations. Using this trainer the students / trainee can make measurement and draw graphs that describes the role of a flapper nozzle. Graphs can be drawn between (a) Output pressure vs displacement of flapper nozzle, and (b) Output pressure vs the distance traversed by the walking beam. By doing so, they correlate complete characteristics of the flapper nozzle system. System in addition to study an application of a FLAPPER NOZZLE system itself, namely a control valve itself minus valve portion of it.
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