Variable-Pitch Dry Screw Vacuum Pump DVS serise

DVS Variable-Pitch Dry Screw Vacuum Pumps deliver stable, oil-free operation for demanding vacuum processes.

• Oil-free pumping chamber eliminates process contamination

• Compatible with condensable gases and light particles

• Enables clean solvent recovery in drying, distillation and purification processes

• Suited for chemical, pharmaceutical, semiconductor, aerospace and new-energy industries

• Integrates with Roots vacuum pumps for higher-speed complete vacuum systems

• • Liquid-free, low-wear structure: Dry screw vacuum pumps use no liquid sealing medium; synchronized counter-rotating screw rotors with controlled clearances achieve contact-free operation with long service life.
• • Variable-pitch internal compression: Lowers discharge temperature and cuts energy consumption under process loads.
• • High-vapor-pressure compatible: No liquid condensation in the pumping chamber, suitable for vapor-phase discharge of dichloromethane, acetone and other solvents.

Performance & Stability

• • Twin-screw non-contact compression: wear-free rotors, reliable vacuum performance under harsh process conditions
• • Stable pumping coverage from atmospheric pressure to 10 Pa, insensitive to seasonal or operational changes

Oil-Free Design & Corrosion Resistance

• • Dry oil-free pumping chamber: eliminates process contamination and waste oil, supports in-situ solvent/nitrogen flushing
• • Optional anti-corrosion coatings: Ni-P plating, Hastelloy diffused coating, dual-layer PEK coating for corrosive, solvent-rich media
• • Straight-through exhaust structure: fast gas discharge, condensate compatible, enables direct downstream solvent recovery

Cooling, Sealing & Installation

• • Jacket water cooling: lowers operating temperature, supports long-term continuous-duty operation
• • Configurable sealing: mechanical + lip seal combination, optional air/nitrogen barrier protection for targeted working conditions
• • Standard IEC flange: easier installation, lower operating noise, improved coupling alignment

VFD Variable Frequency Drive

• • Standard or optional for DV dry screw pumps; stepless pumping rate adjustment via speed control
• • Adjustable range: 30%–100% rated speed (subject to VFD setup and process needs)
• • Cuts energy consumption notably under partial load, more cost-effective than fixed-speed operation
• • Caution: Prolonged low-frequency operation may trigger condensation for condensable media; confirm minimum frequency with our technical team