Can a Water Tank's Weight Efficiently Compress Air in a Cylinder?

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Using the weight of a water tank to compress air in a cylinder is proposed as a method for pneumatic systems. The design involves a positive-displacement cylinder, potentially a ram or spring return type, that moves with the tank. As the tank fills, its weight compresses the air, and draining the water allows the tank to draw in more air. The discussion seeks recommendations for the best type of cylinder for this application and sources for purchasing one. The focus remains on practical pneumatic solutions without delving into perpetual motion concepts.
mrwaustin
I want to compress air using the weight of a tank of water. Under the tank I propose some form of positive-displacement cylinder -perhaps a ram or spring return type cylinder.

The tank will be supported in such a way so that it will move along with the cylinder. When filling up the tank the weight should cause the cylinder to compress the air. When I drain some of the water the tank will recede to its original position and draw in more air until the tank is refilled.

My question is: What type of cylinder is best for this? And can you refer me to a site or vendor for the cylinder?

Thanks,

Michael Wright

PS No perpetual motion ideas here. Just a study in pneumatics.
 
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Just do a google search on pneumatic cylinder or air cylinder.
 
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