The reciprocating or piston air compressor works on the same principle as an automotive engine. The piston is attached to a rotating crankshaft that is driven by electricity or gasoline.
The Valve Head
The valve head sits directly over the cylinder. On the downstroke, an inlet valve opens allowing outside air into the cylinder. On the upstroke, the air is compressed. The discharge valve opens sending the compressed air to the storage tank. With each cycle, more air enters the tank.
Compressor Safety
The maximum capacity of the storage tank on a piston air compressor is predetermined. When the tank reaches its maximum capacity a pressure switch shuts the compressor off. A regulator is used to control pressure in the airline. As a fail-safe, the pressure switch is backed up by a safety valve. If the pressure switch fails, the safety valve opens to prevent excess pressure in the tank.
Compressor Applications
Commercial air compressors are used by auto repair shops, factories, and construction companies.
Choosing a Compressor
Check the air pressure requirements of the tools the compressor will power to be sure the piston air compressor is powerful enough. Is there a ready source of power for a compressor with an electric motor? If not choose a gas-powered model. Compressors can be stationary or portable. Will the compressor have to be moved around? The best way is to buy piston air compressor from top manufacturers only.
