The oil-free and dry compressing  small piston pumps from the PB-2 product line can be used for evacuating, conveying and compressing gases and vapours up to a final vacuum of 80 mbar. Six different ranges with further unique models are available within the product line. (Curve presentation of the standard models, per model range).

The PB-2 product line is equipped with a single-cylinder piston pump with con-rod drive. The piston, rigidly fixed to the con-rod, carries out a tilting motion in the cylinder when moving up and down. The piston rings are therefore more heavily stressed than with a linear drive. The length of the con-rod from the eccentric shaft to the piston is however designed to impart as small a tilting motion as possible to the piston. The eccentric shaft with con-rod is additionally ball-bearing mounted in the carrier plate and does not sit on the motor shaft. This ensures that the motor shaft and the A-side motor bearings are not loaded. This well-thought-out design also ensures a long service life for the mechanical components.

The materials used, such as aluminium for the gas-conducting components, stainless steel for the valves and piping and VITON (FKM) for the diaphragms, open up a wide range of application options with non-aggressive gases.


  • Oil-free, dry-running piston pumps for transporting, evacuating and compressing gases. The extremely smooth cylinder running surface guarantees low friction for the PTFE piston rings.
  • Quiet and low-vibration thanks to precise balancing of pump and drive motor.
  • Permanent operation possible through optimised cooling and separate mounting of the eccentric shaft.
  • Maintenance-free thanks to encapsulated ball bearings with special grease filling.

Free flow3.5 l/min4 l/min5.8 l/min6.5 l/min8 l/min11 l/min
Final vacuum120 mbar128 mbar80 mbar120 mbar128 mbar80 mbar
Final pressure (abs.)4 bar6 bar4 bar
Pump heads1
Hose coupling, suction / pressureG 1/8"
Motor power / r.p.m.0.07 kW / 1400 min-10.09 kW / 2600 min-1
Mains requirement / Frequencies230 V - 50 Hz
Noise level49 dBA bis 57 dBA
Permissible gas admission temp.+ 5 C° bis + 45 C°
Permissible ambient temperature+ 5 C° bis + 45 C°
Permissible ambient temperature motor+ 5 C° bis + 45 C°
Permissible ambient temperature pump+ 5 C° bis + 45 C°
Dimensions L x W x H137 mm x 80 mm x 140 mm
Weight1.8 kg
Impermeable to gasnicht möglich

vacuum flow [l/min] pressure [mbar] 0 100 200 300 400 500 600 700 800 900 0 2 4 6 8 10 12 KP25-H5-AW14 KP25-H6-AW14 KP25-H9-AW14 KP25-H5-AW26 KP25-H6-AW26 KP25-H9-AW26
pressure flow [l/min] pressure [bar] 0 1 2 3 4 5 6 7 0 2 4 6 8 10 12 KP25-H5-AW14 KP25-H6-AW14 KP25-H9-AW14 KP25-H5-AW26 KP25-H6-AW26 KP25-H9-AW26

User manual Data sheet