Liquid water, water vapor, particulates and oil can all interfere with proper compressed air operation. Removing moisture and contaminants ensure that the system does not experience premature wear or damage.

Pneumatics is a versatile, proven technology for powering or controlling the operation of an amazing number of applications, from neo-natal respirators to building-size industrial equipment. The range of pneumatics reducing valves capabilities is illustrated by the variety of typical systems, their uses and requirements.

? General pneumatic circuits (e.g. directional control valves and cylinders in machine cleaning, air motors and high-speed tools)
? OEM machines
? Breathing air
? Heavy duty lubrication
? Direct injection lubrication, such as required for conveyor chains
? Oil-free applications like paint spraying or film processing
? Critical pressure control and instrumentation
? Motion control for industrial automation or equipment operation
? Continuous processes like those in paper mills or chemical plants

While the configuration of pneumatic components for each of these systems varies, they all require air of the proper quality, temperature and pressure to function most productively. The air leaving a compressor is hot, dirty and wet, and is generally at a higher pressure than desired. Before this air can be used, it needs to have contaminants removed, pressure reduced and, in many cases, oil added to lubricate downstream equipment. This article examines the first requirement: removing moisture and contaminants.