Gas Air Compressors

Gas Air Compressors

Gas air compressors consist of a gas-powered motor, an air tank and various valves and tubes. Small portable compressors are made out of plastic to keep them lightweight and easy to carry. One critical safety feature that most compressors have is a safety relief valve that uses a sensor to detect if the pressure in the tank is too great. Air compressors also often have a belt guard and a filtration system, especially if they use oil for lubrication. These compressors are also fitted with a gas tank. Gas air compressors are used in many applications and can be found in varied environments, such as a large factory or the back of a pickup. One of the most widely known uses is as a supply of pressurized air for pneumatic tools. Nail guns, staplers, jackhammers and other tools rely on a steady air flow for their power. Gas cylinders and air tanks are filled by compressors and often contain compressed gas themselves. Tires and inner tubes are inflated by compressed air. Heavy duty air compressors, also known as industrial air compressors, are used for air purification, circulation and temperature control systems as well as in industrial cleaning and drying.

To create a powerful stream of air, gas compressors use one of two methods. Positive displacement compressors fill a chamber with air, condense it and then empty it into a tank. Dynamic compressors use a rotating part to speed and slow air, which causes the air to condense itself against the blades or rotors. Air can be compressed to as little as one-eighth its original volume. As more and more air fills the tank, the molecules begin to move faster and the pressure builds even more. When a valve opens, the air moves rapidly toward the opening in an attempt to expand to its normal size. This rush of air can be conveyed through hoses or tubes, then into a tool or out through a nozzle. Within the two categories of compressors, there are many variations and designs including centrifugal, reciprocating, mixed-flow, axial-flow, rotary, screw, mini, electrical, scroll and diaphragm compressors. Air compressors are similar to pumps because both machines increase the pressure for a gas or liquid. Gases can be condensed whereas liquids cannot, so a compressor works with gases while a pump transports liquids under pressure. The American Society of Mechanical Engineers (ASME) regulates the quality and safety of air compressors and in some states only allows the purchase and rental of ASME-approved compressors.