Constant-Pitch Dry Screw Vacuum Pump DVS Series

Constant-Pitch Dry Screw Vacuum Pump DVS Series

Product Overview

Key Specifications

Pumping Speed: 150 to 600 m³/h displacement across the product line.
Ultimate Pressure: Down to 10 Pa (0.1 mbar) for demanding continuous vacuum duty.
Motor Power: 4 kW to 18.5kW.
Cooling System: Water-jacketed housing to reduce operating temperature for continuous-duty service.
Shaft Sealing: Dual lip seals with mechanical seal combinations and optional air or N₂ barrier.

Design & Features

Oil-Free Pumping Chamber: Clean dry vacuum operation without oil contamination in the pumping chamber.
Unobstructed Exhaust: Features a short gas path for rapid evacuation and a direct-through pump body to handle liquids, condensate, and micro-particles.
Anti-Corrosion Options: Electroless Ni-P plating, Hastelloy coatings, and dual-layer PEK coating options.
System Integration: Compatible with Roots boosters for higher pumping speed and complete vacuum systems.

Typical Applications: Suitable for vacuum distillation, drying, solvent recovery, concentration, CVD, freeze-drying, photovoltaic processing, and industrial furnace processes.

Description

Specifications

Reviews

Product Introduction

Constant-Pitch dry vacuum pump uses meshing screw rotors to smoothly compress and discharge gas oil-free.

• Uses two meshing screw rotors to smoothly compress and discharge gas.
• Employs Archimedean, Kumpi, and circular curves to maintain precise clearance.
• Ensures the discharged gas is completely free from oily contaminants.
•Transmits motor power from the driving shaft to the driven shaft via synchronous gears.

Working Principle

• 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.

Design Features

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

Technical Data

Technical Specifications	DVS-150	DVS-300	DVS-450	DVS-600
Pumping Speed (m³/h)	150	300	450	600
Speed (rpm)	2900	2900	2900	2900
Ultimate Pressure (Pa)	10	10	10	10
Max. Exhaust Pressure (bar.g)	0.3	0.3	0.3	0.3
Motor Power (kW)	4/5.5	7.5/11	15	18.5
Inlet Size (DN)	40	50	80	100
Outlet Size (DN)	32	40	50	65
Cooling Water Connection	G3/8	G1/2	G1/2	G1/2
Cooling Water Consumption (L/min)	10	20	30	35
Weight (kg)	260	380	560	630
Standard Base Materials
Pump Body / End Cover	HT-250 Cast Iron
Rotor / Shaft	QT-600 Ductile Iron (Integrally machined)
Anti-Corrosion Coating Options
Chemical Plating	Electroless Nickel Plating (Ni-P)
Thermal Diffusion / Cladding	Hastelloy Diffused Coating (C-276 / C-22)
Polymer Composite Coating	Dual-layer PEK Coating
Sealing System Configurations
Inlet End	Dual lip seal
Exhaust & Drive Ends	Mechanical seal + lip seal + optional air / N₂ barrier
Seal Face Materials	Silicon Carbide (SiC), Carbon Graphite, 316L SS

Product FAQs

1. What after‑sales support you provide?

12‑month warranty, remote support, video commissioning & spare‑parts supply.

2. Which gases can be drawn? Are there any limitations?

Suitable Media

Clean air, inert gases, condensable gases (water vapor, NMP, solvent vapors), gases with light dust content

Conditions Requiring Custom Configuration

• Strongly corrosive gases (acidic, chlorine-based media): matched with anti-corrosion coatings & treatment
• High dust concentration: pre-filtration configuration required
• Flammable / explosive media: explosion-proof configuration required
• Heavy liquid droplets or sudden liquid ingress: targeted structural adjustment

3. What coating should I choose for corrosive process?

Ni‑P for mild corrosion; Hastelloy C‑276 for strong （Please contact us if you require technical support.）

4.Can the extraction speed be adjusted through frequency conversion? What's the range of adjustment?

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

Performance Curves

DVS-150 & DVS-300 DVS-450& DVS-600

Dimensions

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