Getting 3000 PSIĪ three-stage hand pump works exactly the same way. A compressor may perform this process about 900 times per minute, which is how they are able to fill so quickly. The volume of each subsequent stage gets smaller because it’s under greater pressure. Then the air is pushed into the 3rd stage for the final compression. The one-way valve prevents the air from going back out and rather directs it into the 2nd stage chamber where another piston and check valve performs a similar task. So instead of one inlet, check valve, and outlet, you now have multiple.Īir is drawn into the first chamber. They do this by combining multiple stages where each stage builds upon the last. SCUBA compressors can make pressures in excess of 4500 PSI. When a normal hand pump only makes 150 PSI, how do you expect to get up near 3000 PSI? You use the same concept as you would with a multi-stage compressor. Your typical PCP airgun operates at 200 bar, which is about 2900 PSI. But PCP airguns need a lot more pressure. Actually, that’s pretty similar to your typical home pancake compressor. A “good” bicycle hand pump may top out at around 150 PSI. Rather, the air is forced out the outlet into the vessel you are trying to fill. When you push down, a check valve or one-way seal prevents the air from going back the way it came in. Much like the difference between a single-stage compressor and a multi-stage compressor, the typical hand pump and a three-stage HPA hand pump are very different.Ī typical hand pump draws air in during the up-stroke of the handle. The design is the same, but the function is very different. Example 3-Stage Hand Pump Beyond a Bicycle Pump
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