High-capacity dry screw vacuum pumps combining deep ultimate vacuum, fast evacuation and contact-free oil-free compression. CompreVac supplies and supports the Elmo Rietschle S-VSI 100 and S-VSI 300 for demanding industrial vacuum applications throughout Canada.
Deep-vacuum dry screw technology supplied and supported by CompreVac.
Elmo Rietschle S-VSI screw pumps combine oil-free compression with very deep vacuum. CompreVac provides pump selection, application engineering, replacement equipment, parts and service support.
The Elmo Rietschle S-VSI uses two precision screw rotors, one with a right-hand thread and the other with a left-hand thread. The screws rotate in opposite directions without touching the compression housing.
Precision gearing keeps both rotors synchronized while very tight internal clearances allow the machine to generate deep vacuum without oil being used as the sealing or working fluid in the compression chamber.
The progressively changing screw pitch provides internal volume contraction as gas moves axially through the pump, helping reduce operating temperature and improve efficiency.
S-VSI technology combines deep vacuum capability with clean, contact-free compression and long service intervals.
Published ultimate vacuum reaches approximately 0.075 Torr / 29.92 inHg.
No oil is used as the sealing or compression fluid in the process gas path.
Both screw rotors operate without contacting one another or the compression housing.
The dry compression chamber eliminates frequent process-oil changes and related maintenance.
Two pump sizes cover nominal pumping capacities from approximately 59 to 212 CFM depending on model and operating frequency.
The S-VSI range provides high-capacity, deep-vacuum performance with a dry, contact-free compression chamber. The design is particularly suited to industrial applications requiring fast evacuation and consistent vacuum performance.
The closed-cooled configuration provides the same dry screw vacuum principle in a packaged cooling arrangement for installations where a dedicated external cooling-water supply is undesirable or difficult to provide.
Two counter-rotating screw rotors trap gas at the suction end and transport it axially through the pump. As the screw geometry progressively reduces the available chamber volume, the gas is internally compressed before being discharged.
Deep vacuum, high capacity and oil-free compression make the S-VSI well suited to demanding production and process applications.
Fast evacuation and deep vacuum can shorten cycle times in packaging machinery.
Deep vacuum for industrial drying applications requiring clean compression.
Oil-free vacuum generation for selected packaging and process applications.
Deep vacuum for extrusion, degassing and plastics-processing equipment.
Dry screw vacuum for compatible industrial gases and process applications.
High-capacity vacuum generation for engineered centralized industrial systems.
Elmo Rietschle S-Series screw pumps provide high-capacity, oil-free vacuum for demanding industrial processes requiring deep ultimate pressure and clean internal compression.
CompreVac supplies S-VSI screw vacuum pumps together with application engineering, replacement equipment, system integration, parts and service support.
For a new installation, CompreVac can evaluate required pumping speed, operating vacuum, evacuation time, gas composition, cooling-water availability, inlet filtration and controls as part of the complete system.
The S-VSI is a dry-running vacuum pump that uses two synchronized, counter-rotating screw rotors to transport and internally compress gas without oil in the compression chamber.
The published S-VSI 100 and S-VSI 300 datasheet lists an ultimate vacuum of 0.075 Torr, equivalent to approximately 29.92 inHg vacuum.
The S-VSI 100 provides approximately 58.9 CFM at 50 Hz and 70.6 CFM at 60 Hz. The S-VSI 300 provides approximately 177 CFM at 50 Hz and 212 CFM at 60 Hz.
Yes. The process compression chamber operates without oil being used as the sealing or working fluid.
No. The two screw rotors are synchronized by precision gearing and operate with tight clearances without frictional contact inside the compression housing.
The standard S-VSI design uses a water-cooled outer chamber. The datasheet lists cooling-water consumption of approximately 100 L/h for the S-VSI 100 and 400 L/h for the S-VSI 300.
The progressively changing screw pitch allows internal compression to occur gradually as the gas moves through the pump, helping reduce operating temperature and improve efficiency.
Yes. Elmo Rietschle specifically identifies packaging as a suitable application, and the combination of high pumping speed and deep vacuum can help shorten evacuation cycle times.
Yes. CompreVac can review required pumping speed, operating vacuum, evacuation time, gas conditions, duty cycle and cooling requirements to help select the appropriate screw vacuum pump.
Yes. CompreVac provides application support, parts, troubleshooting, field service and workshop repair for industrial Elmo Rietschle vacuum equipment.
Speak with CompreVac about S-VSI 100 and S-VSI 300 dry screw vacuum pumps for deep-vacuum industrial applications.
Operating Principle
In S-Series screw vacuum pumps compression is achieved by internal volume contraction. A screw vacuum pump consists of two screws, one with a right-hand thread and the other with a left-hand thread. Both screws turn in the compression housing without friction with very tight clearances. They are synchronised via a precision gear methodology.
The compression housing and the special shape of the screws form the compression chambers. Due to the opposite rotation of both screws the chamber connected with the suction port 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). During this transportation the mass of the gas in the chamber increases.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 opens the pressure channel and the pre-compressed gas is discharged through the pressure connection. Cooling is achieved using a water cooled outer chamber. For some pump sizes additional cooling gas can be introduced into the pump.
Please contact CompreVac for application assistance with vacuum pumps and associated equipment.