05-03-2015, 23:38
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Technical Director
AKA: Gus Michel II
 FRC #3946 (Tiger Robotics) Team Role: Mentor
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Join Date: Jan 2014
Rookie Year: 2013
Location: Slidell, LA
Posts: 3,588
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Re: pic: Compressor Backpack
If the goal is to have a way to charge the tank for practice, it would be much simpler to use a single A/C air compressor than four or more 12V ones. - Include a tee somewhere in your high-pressure side, just on the tank side of the pressure relief valve so that relief valve will function as a safety.
- For competition, the third branch of the tee will be capped with a solid plug.
- For practice, replace the solid plug with a vent plug, with a quick disconnect on the open end. Keep this vent plug closed except when externally charging.
- To do an external charge:
- attach the external compressor at the quick disconnect
- open the extra vent plug
- turn on the compressor
- When you reach the desired pressure (or the relief valve vents), turn off the compressor
- close the extra vent plug
- disconnect the quick disconnect fitting
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Do not worry about the VEX camp versus FIRST camp issues. It is a huge marketplace. It is only about 4% penetrated. There is room for everyone. And competition is good for the consumer. - ebarker [more] 
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