
A solar force pump. Image credit sunfuel.co.in
ZIMSEC O Level Combined Science Notes: Pumps: Force pump
- A force pump:
- Has a cylinder, piston, two valves and a spout (outlet)
- It makes use of atmospheric pressure to force fluid/water into the pump through valves
- The valves in the pump allow fluids to flow in one direction only
- When one valve is closed the other one is open
- Uses force to operate at depths above 10m

A force pump in action
- When the piston moves up
- Valve A closes
- and atmospheric pressure forces water up through valve B into the cylinder
- As the piston moves down
- Valve B closes and
- Water is forced through valve B
- into the reservoir (C) and out of the spout
- Water flows continuously from the spout because of the pressure of the air trapped in the reservoir
- The force pump is also known as a deep well pump
To access more topics go to the Combined Science Notes page
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