• Air-End is the heart of screw compressors. It compresses air by displacing between male and female rotors and Air-End's housing walls. Also, it is called as "screw" because of it's rotors are like as screws.


Air-End Running Principle:


  • Male rotor rotates by power of drive motor via belt-pulley or coupling. While male rotor rotates on counter clockwise (by looking from front of the air-end), it forces female rotor to rotate on clockwise. Rotation of the rotors in housing walls, displaces air from suction port to delivery port. Displacement of the chambers which are formed by  rotor and housing walls, graduatally reduces their volume size in air flow direction and air becomes compressed by reducing the volume up to the delivery point.
  • Oil injected into the air-end for providing of  compression by sealing of spaces between rotors and housing walls. Also, oil lubricates rotor bearings and absorbes compression heat in the air-end. The oil cooler rejects the heat in circulated oil and reduces oil temperature to normal, again. For these 3 functions, oil viscosity and other oil parameters must be proper for continuous circulation in normal running temperatures with minimum power losses.


Suction Regulator






TAHSER Compresssor (Air-End) Capacities:

  • from 0.9 m3/min to  28.5 m3/min
  • from 4 bar to 13 bar
  • from 7.5 kW to 160 kW


Running of TAHSER Compressor Units:


  • When the compressor unit has been started, the compressor runs off load till the main motor completes it's startup. Then, the suction regulator's air intake valve opens and the compressor begins to run on load. When the system pressure reaches to minimum output pressure level, minimum pressure valve opens and compressed air passes to the unit's outlet. While running on load, if the output air pressure  increases to the upper limit, suction regulator's air intake valve closes and the compressor begins to runs off load. In this phase, there is no compressed air delivery from the minimum pressure valve. And, there is only an internal circulation air pressure before the minimum pressure valve, in the sytem. When the output air pressure decreases to lower limit, the compressor unit loads itself again, begins and continues to running on load till the next upper limit signal occurence. Also, upper limit pressure is called as maximum working pressure. As a safety addition, there is an over pressure switch circuit which stops running of the compressor if the system pressure overs maximum working pressure setting due to any control failures. In Tahser compressor units, pressure values are monitored by transducers which send analog signals to the PLC. The PLC performs required function depending on analog signal which represents related pressure values. In addition to analog pressure inputs, a pressure switch is used as over pressure saffety device which sends on/off signal directly to the controller. Also, an analog signal based temperature monitoring is performed to protect system against over working temperatures etc.