TM 9-4310-397-14SECTION III PRINCIPLES OF OPERATION1-13. PRINCIPLESOFOPERATION.The rotary air compressor is diesel engine driven through a direct connected coupling. The compressor is capable ofdelivering 125 cfm (3.54 cm/m) compressed air at 100 psi (7.03 kgs cm). The information that follows references theair/oil flow found in figure 1-2.a.AirCleaner. Filters airborne particles from the incoming air to minimize equipment damage from contaminatedair entering the inlet housing.b.InletHousing. Provides control over the compressor intake and engine speed. The COMPRessor UNLOADERAND IDLE CONTROL can be used to manually close the compressor inlet or allow for the system pressure toautomatically regulate the inlet. An external linkage controls the engine speed as necessary.c.Compressor.Uses rotating vanes in an eccentric cylinder to compress atmospheric air up to the required 125cfm (3.54 cm/m) compressed air at 100 psi. (7.03 kgs cm).d.OilSeparator.Receives the compressed air/oil mixture from the compressor and separates the oil through alabyrinth and filter element. Oil that collects inside the filter element is drawn into the inlet housing. Oil that collects inthe bottom of the oil separator is drawn into the thermal bypass.e.ThermalBypass.Senses the oil temperature as it enters and ports the flow directly to the oil filter if thetemperature is below 150° F (66° C) or through the oil cooler first if it is above 150° F (66° C).f.OilCooler.Cools the oil prior to being filtered and sent back to the compressor.g.OilFilter.Filters particles from the oil to minimize equipment damage from contaminated oil entering thecompressor.h.PressureRegulator.Opens at pressures above 100 psi (7.03 kgs cm) and closes at pressures below 100 psi(7.03 kgs cm), this regulates the system pressure by automatically operating the inlet housing. When the pressureregulator is closed, the inlet housing opens the compressor inlet to raise system pressure. When the pressure regulatoris open, the inlet housing closes the compressor inlet to lower system pressure.i.MinimumPressureValve. Closes the discharge from the filter separator if the compressed air demand is greatenough to drop the system pressure below 60 psi (4.2 kgs cm2). Closing the discharge at pressures below 60 psig (4.2kgs cm2) prevents oil from being carried out of the oil separator and into the hose reel and double discharge valve.j.BlowdownValve.Relieves system pressure to atmosphere when the compressor stops. Suction from the inlethousing keeps this valve closed.k.SafetyValve. Opens at 125 psi (8.79 kgs cm) to relieve system pressure to atmosphere.1-6
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