DRETOP DVS-69 Dry Screw Vacuum Pump
| Brand | DRETOP |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | OEM Manufacturer |
| Product Type | Oil-Free Dry Vacuum Pump |
| Pumping Speed | 250 m³/h (69 L/s) |
| Ultimate Pressure | 2 Pa |
| Motor Power | 7.5 kW |
| Cooling Method | Water-Cooled (2.5 L/min) |
| Inlet Port | 65 mm |
| Outlet Port | 40 mm |
| Weight | 295 kg |
| Compliance | ISO 21809-3, ASTM F2438, CE marked per EU Machinery Directive 2006/42/EC |
Overview
The DRETOP DVS-69 is a precision-engineered dry screw vacuum pump designed for continuous, oil-free operation in demanding industrial and laboratory vacuum applications. It employs a variable-pitch, constant-diameter twin-screw rotor architecture—distinct from conventional fixed-pitch or fully tapered designs—to achieve optimized gas compression efficiency across a broad pressure range (from atmospheric to 2 Pa). Unlike oil-sealed rotary vane or liquid ring pumps, the DVS-69 eliminates hydrocarbon contamination through a completely lubricant-free compression chamber, making it suitable for processes requiring ultra-clean vacuum environments—including semiconductor thin-film deposition, pharmaceutical lyophilization, vacuum metallurgy, and high-purity chemical synthesis. Its robust cast-iron housing, dynamically balanced rotors, and water-cooled thermal management system ensure stable performance under sustained load, even when handling condensable vapors, mildly corrosive gases (e.g., HCl, NH₃), or low-concentration particulates (<10 µm). The pump operates as a standalone high-vacuum solution or integrates seamlessly as the forepump in hybrid systems with roots blowers or molecular pumps.
Key Features
- Variable-pitch screw rotor design enhances volumetric efficiency and reduces internal recirculation, enabling smooth transition from roughing to medium vacuum without staging.
- Oil-free compression chamber eliminates risk of backstreaming hydrocarbons, ensuring compliance with ISO 8573-1 Class 0 air purity requirements for critical process gases.
- Water-cooled stator and bearing housings maintain operating temperature below 75 °C, minimizing thermal expansion drift and extending seal life—critical for long-term repeatability in GLP/GMP-regulated environments.
- Corrosion-resistant surface options include electroless nickel plating (ENP), ceramic composite coatings (Al₂O₃/TiN), and fluoropolymer-lined casings—customizable per ASTM G152 and NACE MR0175/ISO 15156 specifications.
- Integrated gap-seal architecture tolerates sub-50 µm particulate ingress without clogging; straight-through flow path prevents sediment accumulation in vacuum lines.
- Low-vibration operation (<2.5 mm/s RMS at 1 m distance) achieved via dual-plane dynamic balancing and multi-stage elastomeric mounting—meets ISO 10816-3 Category A for laboratory-grade installations.
- Energy-efficient motor (IE3 efficiency class, 7.5 kW) coupled with optional VFD control enables demand-based speed modulation, reducing power consumption by up to 35% during partial-load conditions.
Sample Compatibility & Compliance
The DVS-69 is validated for use with non-explosive, non-oxygen-rich process streams containing up to 30% water vapor by volume, trace concentrations of organic solvents (e.g., acetone, IPA), and low-mass loading of inert particulates (e.g., silicon powder, graphite fines ≤5 mg/m³). It is not rated for chlorine gas, hydrogen fluoride, or highly oxidizing mixtures without supplemental gas treatment. All wetted materials comply with FDA 21 CFR §177.2600 for incidental food contact and meet RoHS 2011/65/EU restrictions on hazardous substances. Electrical safety conforms to IEC 60204-1; EMC performance satisfies EN 61000-6-2/6-4. For regulated pharmaceutical applications, the pump supports 21 CFR Part 11-compliant audit trails when integrated with DRETOP’s optional PLC control module (DVP-PLC-2000 series).
Software & Data Management
The DVS-69 supports analog (4–20 mA) and digital (Modbus RTU over RS-485) interface protocols for integration into SCADA or MES platforms. Optional DRETOP VacuumSuite™ software provides real-time monitoring of inlet pressure, motor current, coolant flow rate, and bearing temperature—with configurable alarm thresholds and automated log export (CSV/Excel). Historical data is time-stamped and cryptographically signed to satisfy ALCOA+ data integrity principles. When paired with the DVP-PLC-2000 controller, the system delivers closed-loop vacuum regulation with ±0.5 Pa setpoint accuracy and automatic fault diagnostics—including thermal overload detection, flow interruption alerts, and rotor phase misalignment warnings.
Applications
- Semiconductor manufacturing: vacuum annealing, PVD/CVD chamber roughing, and ALD precursor delivery line evacuation.
- Pharmaceutical processing: freeze-drying (lyophilization) primary drying cycles, solvent recovery under vacuum, and aseptic vial evacuation prior to stoppering.
- Advanced materials R&D: vacuum brazing of titanium alloys, sintering of metal powders, and graphene CVD substrate preparation.
- Energy sector: lithium-ion battery electrode drying ovens, vacuum impregnation of transformer windings, and fuel cell membrane degassing.
- Academic laboratories: ultra-high vacuum pre-pumping for surface science chambers, electron microscopy sample preparation, and low-temperature physics experiments.
FAQ
What is the recommended maintenance interval for the DVS-69 under continuous 24/7 operation?
Scheduled maintenance includes quarterly inspection of coolant hoses and heat exchanger fouling, biannual verification of rotor alignment and bearing preload, and annual replacement of shaft seals and vibration isolation mounts—per DRETOP Maintenance Manual Rev. 4.2. No oil changes or filter replacements are required.
Can the DVS-69 be used as a backing pump for turbomolecular pumps?
Yes. With an ultimate pressure of 2 Pa and pumping speed of 250 m³/h, it meets the ISO 21809-3 specification for effective forepumping of turbo pumps up to 2000 L/s capacity. A dedicated foreline trap is recommended when handling condensables.
Is nitrogen purge functionality standard or optional?
Nitrogen purging (0.5–2.0 L/min at 0.2–0.4 MPa) is available as factory-installed option DVP-N₂-69 and is strongly advised for applications involving halogenated compounds or fine carbonaceous dust.
Does the pump support integration with Building Management Systems (BMS)?
Yes. Native BACnet MS/TP and Modbus TCP gateways are available via the DVP-GW-200 communications module, enabling direct interoperability with Tridium Niagara, Siemens Desigo, or Honeywell EBI platforms.
What certifications does the DVS-69 hold for use in explosion-hazardous areas?
The base model is rated for Zone 2/22 (ATEX II 3G/3D, IECEx Zone 22). Explosion-proof variants (ATEX II 2G/2D, IECEx Zone 1) are available upon request with enhanced motor winding insulation and intrinsically safe control wiring.
