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I have build several pneumatic LEGO compresssors with small pneumatic pumps (part no: x191c01). This type of pump has a volume of only 0.5 cm³. A technic Pneumatic Pump New Complete Assembly (part no: 2797c01) has almost 7 times more volume: 3.3 cm³. So with fewer movements you can have the same amount of air transfered. Thats why I tried to build a compressor with large pumps.
A pump is a pneumatic cylinder with a one way valve. Air comes in from the outsite and goes out through the tube. A large pump does need more power to press the air out of the cylinder then a small one. The area of the piston is larger and therefor it takes more force to push. This type of pump has a spring which pushes the piston back. The construction of the compressor must be very strong and you need one or more strong motors to propel the compressor.
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Air compressor PF
