Dry running screw vacuum pumps S-VSI series

S-VSI vacuum pump models

Note: S-VSI 100(51) stainless steel, max pressure 14 bars, with plate heat exchanger.

Note: IE4 motor for model S-VSI 301

S-VSA vacuum pump models

S-VSB vacuum pump models

Notes: Refers to suction conditions (1 bar abs. and 20 °C) without gas ballast valve at inlet connection, 2006/42/EC and 2006/95/EC directives and the EN 60034-1 and thermal class F, # on request.

Principle of operation

A screw vacuum pump consists of two parallel, screw-shaped rotors (1 and 2), one with a right-hand thread and the other with a left-hand thread. Both screws turn in the compression housing (9) without friction and at very tight clearances. They are synchronized via a precision gear (3). The compression housing and the special shape of the screws form the compression chambers (4).Due tot he opposite rotation of both screws the chamber connected with the suction port (5) is enlarged and the gas is transported into the compression chamber. Then the chamber moves axially from the suction side to the pressure side (arrow). In variable pitch models, the gas is compressed at each pitch change and cooled before the next pitch change, resulting in greater efficiency. On the pressure side the chamber is moved against the axial housing wall and the volume is reduced until the front surface of the screw (1) opens the pressure channel (6) and the pre-compressed gas is discharged through the pressure connection (7). Cooling is achieved using a water cooled outer chamber (8). For some pump sizes additional cooling gas can be introduced into the pump. (10).

S-VSI vacuum pump

Dry running, non-contact operation screw vacuum pump with IE3-IE4 (one model) motor. Ideally for realization of short evacuation times, like e.g. in the food processing and packaging or with drying processes. High efficiency thanks to the precision graduation of the screw pitch. Maximum tightness thanks to labyrinth, shaft and piston ring seals. Designed for industrial applications devoid of aggressive gases. 

Accesories: gas-ballast valve, cool. water circulation, dampness separator, vacuum tight suction filter, thermostatic water valve, non-return valve, motor starter.

S-VSA vacuum pump

Screw rotors with a fixed pitch and integrated cooling circuit. A combination of mechanical seals and double-lip PTFE seals assure maximum shaft tightness. Low noise level, easy to service. Corrosion resistant versions feature special coatings, depending on the application. Suitable for solvent recovery and drying processes in the plastics industry.

Accesories: Vacuum switch, control box, bleeding valve, vacuum gauge, butterfly valve, condenser, flushing unit.

S-VSB vacuum pump

Screw rotors with a progressive graduation. A combination of mechanical seals and double-lip PTFE seals assure maximum shaft tightness. Designed for use with seal purge gas. Low noise level, easy to service. Low operating temperature. Corrosion resistant versions feature special coatings, depending on the application. Suitable for solvent recovery and drying processes in the chemical and pharmaceutical industry. ATEX compliant versions are available. 

Optional Accesories: Flushing unit, Bleeding valve, Control box, Vacuum switch / Vacuum gauge, Butterfly valve, Condenser.

Applications:

• Chemical and pharmaceutical industry (Degassing, Distillation)

• Industrial applications (Coating, Metallurgy, Drying)

• Packaging industry (Central vacuum systems)

• R&D / laboratories

• Solar technology (Cell lamination, Glass plate handling)

• Surface technology / electronics (CVD - PVD processes)

• Food Packaging and Processing (Degassing, Drying)

• Dry running, contact free operation

• High vacuum in one stage

• Application specific options

• High water vapor tolerance

• Short evacuation time due to high suction capacities

• Low noise level

• Easy to service

• ATEX available

• Low life cycle costs

• Oxygen version available (S-VSI)