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The Unofficial LEGO Technic Builder's Guide by Pawel Sariel Kmiec

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Chapter 9. the LEGO pneumatic system

The LEGO pneumatic system is a miniature model of real-life pneumatic and hydraulic systems. It consists of three basic modules: a pressure generator, such as a manual pump or a motorized compressor; a control module, one or more valves that direct the flow of air; and cylinders, which convert pressure to linear movement. The modules are connected by elastic pneumatic hoses.

The basic working principle of a pneumatic system is based on the tendency of air to move from areas of high pressure to areas of low pressure. The pressure generator fills the pneumatic system with pressurized air, and then the air is directed to the cylinders using the control module, which makes the cylinders extend or retract. When the ...

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