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

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