What is an "Air Trap"?

In today's world of automation, compressed air is used in many industries including high-precision machinery and instrumentation. After air is compressed it is cooled by an after-cooler or in a receiver tank, where condensate is formed from water droplets in the air. This condensate also occurs in compressed air distribution piping, leading to rust and fluctuation in high-precision machinery, as well as causing a reduction in product quality.
Air traps are used to remove condensate from the ends of air piping, from receiver tanks, etc. Some models have larger orifices to facilitate the removal of high viscosity condensate with entrained oil or scale. As corrosion resistance is not of particular importance, trap bodies are typically constructed of cast iron.

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