Flapper - Nozzle System (323)
The set up helps in understanding conversion of mechanical motion to pressure signal. It consists of flapper - nozzle mechanism, Dial gauge indicator, pressure gauges and air filter regulator. A regulated supply of pressure, usually over 20 psig, provides a source of air through the restriction.
The nozzle is open at the end where the gap exists between the nozzle and flapper and air escapes in this region.
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