The diaphragm has a large surface area exposed to secondary (outlet) pressure and is quite sensitive to its fluctuations. The compressed air, which flows through a controlled cross-section at the valve seat, acts on the other side of the diaphragm. Outlet pressure is sensed by a diaphragm preloaded with an adjustable pressure setting spring. Relieving or Venting Type Pressure regulator: The compressed air then exits through the outer port to the regulator.Ģ. The air then passes through the filter element, where the fine dirt particles are filtered out. These contaminants then flow down into the bottom of the filter bowl.Ī baffle prevents turbulent air from splashing water on to the filter element. The centrifugal action of the rotating air causes the larger pieces of dirt and water particles to be thrown against the inner wall of the filter bowl. The main elements of the FRL unit are Filter, Regulator, and Lubricator.Īir enters the inlet port of the air filter through angled louvers. Most of the pneumatic system uses FRL unit. FRL unit used in pneumatic system Working of the FRC unit:įRC unit means Filter Regulator Combine unit. To provide lubrication for mating components of valves, cylinders etc.by forming a mist of oil and air.
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