The LG series are oil-free, equal-pitch dry screw vacuum pumps designed for clean, contamination-sensitive industrial processes. Two synchronised screw rotors transport gas axially from inlet to exhaust without any internal compression contact, delivering a completely oil-free pumping chamber. The equal-pitch rotor geometry provides robust, straightforward operation with an ultimate total pressure of 3 Pa, making LG pumps well suited to chemical, pharmaceutical, and general industrial vacuum applications.
Working Principle
Two synchronized screw rotors rotate in opposite directions without contacting each other or the pump housing. Gas entering the inlet is trapped in the cavities formed between the screw profiles and the pumping chamber and is transported axially toward the exhaust. Because the screw pitch remains essentially constant along the pumping section, the trapped gas volume does not progressively decrease in the same manner as in a variable-pitch design. This simple pumping principle provides robust construction, stable performance and reliable operation.
Key Features
Pumping speeds in m³/h at 50 Hz (L/s × 3.6). Ultimate total pressure 3 Pa. Cooling-water supply pressure 0.1–0.25 MPa; recommended outlet temperature ≤40°C. Seal purge gas pressure 0.05–0.15 MPa.
Typical Applications
vacuum distillation, evaporation and solvent recovery
vacuum drying and solvent-handling processes
industrial drying of moisture- and solvent-containing materials
electrode and material drying under vacuum
vacuum heat treatment, sintering and related processes
VOC recovery, degassing and general industrial process vacuum