The Welch oil-free scroll pumps are completely dry-running vacuum generators. They have been particularly designed for applications involving condensable vapours and are ideal for chemical applications in laboratories and in industries. A special coating of all parts being in contact with the media provides a good chemical resistance. The sealing system consists of the spiral-shaped sealing strip used to pack the pump chambers, and of two closed sealing strips for sealing the bearings and the casing space. The working pressure covers the rough and high vacuum ranges. It can also be used for Vacuum drying, Freeze drying, Schlenk lines and Backing turbomolecular pumps.

• Excellent chemical resistance – approved for use with:- Acetone, isopropanol, acrylic acid, methanol, benzene, toluene, chloroform, methylbenzene, ethanol, trifluoroacetic acid, ethylene, water
• Vertical installation of drive or pump shaft, and consequent horizontal position of scroll or pump rotor - Any condensates which might accumulate in the pump can drain without any problem from the stator and rotor system through the discharge port
• No working valve or exhaust valve - Vapours can pass freely through the discharge port without being condensated by the opening pressure of an upstream exhaust valve
• Vertical design reduces load on bearings to prolong service intervals
• Gas ballast system - The condensation of vapours is reduced by feeding in ambient air (gas ballast) during the compression process
• Oil-free alternative to rotary vane pumps
• Designed for permanent operation