Bitzer HE piston is mainly used in Bitzer piston air compressors. Bitzer piston air compressors are composed of compressor mainframe, cooling system, regulating system, lubrication system, safety valve, electric motor and control equipment. The compressor and the motor are fastened on the base with bolts, and the base is fixed on the foundation with anchor bolts. When working, the motor directly drives the crankshaft through the coupling, driving the connecting rod, crosshead and piston rod, so that the piston reciprocates in the cylinder of the compressor to complete the processes of suction, compression, and discharge. The machine is a double-acting compressor, that is, the upward and downward movement of the piston has air suction, compression and discharge.

The Bitzer HE piston in the cylinder of the Bitzer piston air compressor and the packing in the packing device use self-lubricating filled PTFE as the sealing element. Therefore, the cylinder and the packing device do not need to be lubricated with lubricating oil, and the compressed gas is basically pure and free of oil under normal circumstances, and there is no need to add an oil removal device. The disadvantage of this machine is that the motor power is too large, the exhaust pressure is not stable enough, the exhaust temperature is high, the noise is too large, the maintenance workload is large, and the maintenance cost is high.

Both Bitzer HE piston and packing device do not need to be lubricated with oil. Under normal circumstances, the compressed gas is basically pure and oil-free, but because the oil scraper ring often scrapes the oil incompletely and the seal is not good, the oil often runs to the packing device or even the Bitzer HE piston, so that the compressed gas contains oil. In addition, the exhaust temperature is high, sometimes as high as 200°C; the cooler is blocked, resulting in poor cooling effect; the piston ring is easily worn due to oil stains; valve flaps leak; cylinder liners are worn, etc.