FRL Unit Filter Regulator Lubricator Unit Brand - Janatics, Festo, Techno, Airmax, Akari 1. Filter: Air enters the inlet port of the air filter through angled louvers. 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. These contaminants then flow down into the bottom of the filter bowl. A baffle prevents turbulent air from splashing water on to the filter element. The air then passes through the filter element, where the fine dirt particles are filtered out. The compressed air then exits through the outer port to the regulator. 2. Relieving or Venting Type Pressure regulator: Outlet pressure is sensed by a diaphragm preloaded with an adjustable pressure setting spring. The compressed air, which flows through a controlled cross-section at the valve seat, acts on the other side of the diaphragm. The diaphragm has a large surface area exposed to secondary (outlet) pressure and is quite sensitive to its fluctuations. The movement of the diaphragm regulates the pressure. 3. Lubricator: As air enters the lubricator, its velocity is increased by a venture ring. The pressure at the venture ring will be lower than the atmospheric pressure and the pressure on the oil is atmospheric. Due to this pressure difference between the upper chamber and lower chamber, oil will be drawn up in a riser tube. Oil droplets mix with the incoming air and form a fine mist. The needle valve is used to adjust the pressure difference across the oil jet and hence the oil flow rate. The air – the oil mixture is forced to swirl as it leaves the central cylinder so that large particles of oil goes back to bowl and only the mist goes to outlet.