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A very simple inlet/outlet valve system for reciprocal action water pumps - it really couldn't be simpler... 2 x 8" to 10" lengths of bicycle inner tube and nothing else.
See the last step in this Instructable for an explanation of how the valves work and to see a short movie of the pump working.
This Instructable shows how to make one barrel of a treadle pump in order to show the valve system working.
Tools needed
Scissors or a sharp knife
A spanner
A hacksaw
Materials needed
Valves
A bicycle inner tube - doesn't have to be new or in serviceable condition
The rest of the pump cylinder
Less than 1m of 50mm PVC pipe
2 T joints
An end cap
8 large metal washers
8 nuts
An old flip flop
Costs
Valves
Bicycle inner tube = free from a local bike repairer... it was beyond repair.
The rest of the pump cylinder
PVC fittings = $3.80
Threaded bar, washers and nuts = $1.50
Old flip flop = free... worn and broken beyond repair
Grease = maybe around $0.10
Rob Rushworth
Aziza's Place, Cambodia.
http://www.azizafoundation.org/projects_aziza.html
http://www.facebook.com/pages/Azizas-Place/339342099551
http://www.instructables.com/id/Coil-Pump/
http://www.instructables.com/id/Coil-Pump-V20-testing-rig/
http://www.instructables.com/id/A-Garden-Swing-Powered-Water-Pump/
See the last step in this Instructable for an explanation of how the valves work and to see a short movie of the pump working.
This Instructable shows how to make one barrel of a treadle pump in order to show the valve system working.
Tools needed
Scissors or a sharp knife
A spanner
A hacksaw
Materials needed
Valves
A bicycle inner tube - doesn't have to be new or in serviceable condition
The rest of the pump cylinder
Less than 1m of 50mm PVC pipe
2 T joints
An end cap
8 large metal washers
8 nuts
An old flip flop
Costs
Valves
Bicycle inner tube = free from a local bike repairer... it was beyond repair.
The rest of the pump cylinder
PVC fittings = $3.80
Threaded bar, washers and nuts = $1.50
Old flip flop = free... worn and broken beyond repair
Grease = maybe around $0.10
Rob Rushworth
Aziza's Place, Cambodia.
http://www.azizafoundation.org/projects_aziza.html
http://www.facebook.com/pages/Azizas-Place/339342099551
http://www.instructables.com/id/Coil-Pump/
http://www.instructables.com/id/Coil-Pump-V20-testing-rig/
http://www.instructables.com/id/A-Garden-Swing-Powered-Water-Pump/
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Signing UpStep 1Principle
A bicycle inner tube has a circular shape, and when straightened - or moved against its intrinsic shape, the inner tube kinks closed.
This self-closing ability is the principle behind the valve system.
This self-closing ability is the principle behind the valve system.
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Here's a sketch of what happens during the pump cycle.
On the left, the water exits the pump under pressure - the intake pipe closes at its kink (K) due to water pressure.
On the right, water enters the pump and the outlet pipe is closed at its kink (K) by the weight of water in the bucket and evacuation of water from the outlet pipe.
All in all though a very interesting project a simple pump that is easy to make, maintain and replace. Excellent work.