Page 60 - Pressure 10 class

3. Air Pump ( Bicycle Pump)

Working;

Upstroke: when we pull the handle up,

there occurs formation of partial vacuum

in between the two valves. Due to the high

atmospheric pressure outside, the air

enters into barrel through a hole at the top

of the barrel. It opens inlet valve(V1) and

air is stored into the barrel. At the same

time the outlet Valve(V2) remains closed.

Downstroke: when we push the handle

down, the air is compressed and air

pressure increases. It opens the outlet

valve(V2). Air goes out through the nozzle

to fill the bicycle tubes, football bladders

etc.

In the next upstroke, the outlet valve gets

closed.

It prevents returning of the air from tubes

to the barrel.

July 30, 2020 Taranath Baral/GC Shiba/Suraj Thapaliya 60