50 100 0 20 30 40 60 70 80 90 Air driers dry the compressed air by cooling the air to dew point and then continuing cooling to about 38°F, condensing the moisture from the air. The condensed water collects at an auto drain which relieves the water from the system either via a float mechanism or a timer with a solenoid. AIR FILTERS DELTECH PARTICLE COALESCING The orifice that feeds the “brain” of many pneumatic controls is only .005”; therefore, proper filtration is critical. Particle filters remove particles down to the rating of their elements. (usually 40 micron or 5 micron) Coalescing filters remove oil and particles. (usually down to .1 micron) Data sheets suggest replacing the element at 10 PSIG pressure drop at 10SCFM airflow. Deltech filters remove oil and particles down to 1 micron. The element is changed based on colour change in the element from white (pinkish/white) to deep red. RELIEF VALVES Relief valves are safeties preventing over-pressurization of a tank or air line. They should not be painted and should be tested regularly as part of normal maintenance. Relief valves on compressor tanks are set respecting the design operating pressure of the compressor. Often relief valves on control compressors are set at 100 PSIG. The relief valves installed after the pressure reducing valve on control systems are normally set between 23 PSIG and 30 PSIG. Sometimes the pressure relief valve is built into the pressure reducing valve. FLOW METERS Flow meters are installed indicating the quantity of compressed air passing to the control system. (standard cubic feet per hour SCFH) They alert the operator to air leaks in the system, which waste energy and burden the compressor. They are very useful in trouble shooting compressed air leaks in building systems. 2.18 NC NO AIR DRIER NO BYPASS VALVE REFRIGERATED AIR DRIER
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