IPC LAB, Dept. of Chemical Engineering, NITW Page 1

Experiment No - 4

Flapper Nozzle System

IPC LAB, Dept. of Chemical Engineering, NITW Page 2

To study the characteristics of flapper nozzle system.

AIM:

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.

DESCRIPTION:

Figure 1: Flapper nozzle system

Application of Flapper nozzle mechanism in I/P converter:

IPC LAB, Dept. of Chemical Engineering, NITW Page 3

1) Adjust the air supply to 20 psig by air regulator.

PRODECURE:

2) Increase the gap between flapper and nozzle to get 3 psi signal pressure and note the dial

reading.

3) Decrease the gap between flapper and nozzle by gap adjusting screw. Note the dial gauge

reading for each psi change in signal pressure. Ensure that supply pressure is maintained at 20

psi.

4) Repeat the set of observation by increasing the gap.

5) Repeat the experiment for supply pressure of 15 psig.

6) Tabulate the readings in the observation table and plot the graph of signal Pressure verses

nozzle gap

MODEL GRAPH:

OBSERVATIONS:

Sr.no Dial gauge reading Nozzle gap (mm)

Change in signal pressure(psi)

𝐆𝐆𝐆𝐆𝐆𝐆𝐆𝐆 𝐨𝐨𝐨𝐨 𝐅𝐅𝐅𝐅𝐆𝐆𝐅𝐅𝐅𝐅𝐅𝐅𝐅𝐅 𝐆𝐆𝐨𝐨𝐧𝐧𝐧𝐧𝐅𝐅𝐅𝐅 = 𝐂𝐂𝐂𝐂𝐆𝐆𝐆𝐆𝐂𝐂𝐅𝐅 𝐆𝐆𝐆𝐆 𝐬𝐬𝐆𝐆𝐂𝐂𝐆𝐆𝐆𝐆𝐅𝐅 𝐅𝐅𝐅𝐅𝐅𝐅𝐬𝐬𝐬𝐬𝐩𝐩𝐅𝐅𝐅𝐅

𝐂𝐂𝐨𝐨𝐅𝐅𝐅𝐅𝐅𝐅𝐬𝐬𝐅𝐅𝐨𝐨𝐆𝐆𝐂𝐂𝐆𝐆𝐆𝐆𝐂𝐂 𝐜𝐜𝐂𝐂𝐆𝐆𝐆𝐆𝐂𝐂𝐅𝐅 𝐆𝐆𝐆𝐆 𝐆𝐆𝐨𝐨𝐧𝐧𝐧𝐧𝐅𝐅𝐅𝐅 𝐂𝐂𝐆𝐆𝐅𝐅

CALCULATIONS:

CONCLUSIONS: