Roots Vacuum Pump DVB Series

Product Overview

Key Specifications

Pumping Speed: 250 to 40000 m³/h displacement across the product line.
Ultimate Pressure: Down to 1 Pa (0.01 mbar) for demanding continuous vacuum duty.
Motor Power: 1.5 kW to 37 kW.
Cooling System: Water-jacketed housing to reduce operating temperature for continuous-duty service.
Shaft Sealing: five‑point mechanical seal provides zero‑leakage capability.

Design & Features

gear: Precision synchronized helical gears guarantee quiet, reliable operation; drive‑end mounting minimizes torque load.
rotor: Specially‑manufactured rotors feature dynamic balancing for minimum vibration and noise.
Adopt vertical structure design: Vertical gas flow minimizes the risk of rotor unbalance upon liquid ingestion.
seal structure design: Mechanical seal delivers long service life and high operating performance.

Typical Applications: DVB‑series Roots vacuum pumps are suitable for chemical, pharmaceutical, semiconductor and new‑energy industries, as well as numerous general medium‑low vacuum industrial applications such as food processing, vacuum furnaces and dryers.

Description

Specifications

Reviews

Product Introduction

The DVB series Roots vacuum pump is a positive‑displacement vacuum pump, also known as a mechanical booster pump, widely used for medium‑ and high‑vacuum generation.

• Large gas‑handling capacity: Excellent for pumping large gas volumes.
• Requires backing pump: Must operate in series with backing pumps such as rotary‑piston, liquid‑ring, rotary‑vane or dry vacuum pumps.
• Boost vacuum performance: Delivers higher pumping speed and better ultimate vacuum when assembled into a vacuum system.

Working Principle

The Roots vacuum pump features two symmetrical "8"-shaped rotors that rotate in opposite directions. Synchronized by gears, the rotors maintain extremely tight, non-contact clearances with each other and the pump casing.

Ultimate vacuum

The DVB series Roots vacuum pump suits high‑pumping‑speed applications within the vacuum range of 0.01 mbar to 30 mbar. It cannot run independently or start at atmospheric pressure and shall only be activated after a backing pump evacuates its inlet to a certain vacuum level. Common backing pumps include oil‑sealed, liquid‑ring and dry screw vacuum pumps. Refer to the table below for the ultimate vacuum attainable by multi‑stage Roots pumps in series with different backing pumps.

Design Features

• Mechanical seal: Delivers long service life and stable operating performance.
• Precision helical timing gears: Enable quiet and reliable operation; drive‑end mounting reduces torque load.
• Optional 5‑point mechanical seal: Achieves zero‑leakage performance.
• Vertical gas‑flow path: Reduces rotor unbalance risk when liquid is ingested.
• Proven robust construction: Ensures reliable operation under high‑temperature and high‑pressure conditions.
• Integrally cast rotor & shaft: Large‑diameter shaft minimizes impeller damage risk.
• Special rotor manufacturing: Dynamic balancing suppresses vibration and noise to the lowest level.
• Proprietary rotor profile: Provides high volumetric efficiency.

Technical Data

Model	Pumping Speed	Rotating Speed	Motor Power	Cooling Water Flow	Inlet / Outlet Port Size	Lubricating Oil Volume	Pump Head Weight
DVB 250	250 m³/h	2900 rpm	1.5 kW [90S–2–B5]	5 L/min	DIN 65	0.6 L	72 kg
DVB 550	550 m³/h	2900 rpm	3 kW [100L–2–B5]	5 L/min	DIN 100	0.6 L	86 kg
DVB 720	720 m³/h	2910 rpm	4 kW [112M–2–B5]	8 L/min	ANSI 100	1.5 L	108 kg
DVB 1000	1100 m³/h	2910 rpm	4 kW [112M–2–B5]	8 L/min	ANSI 100	1.5 L	140 kg
DVB 1500	1500 m³/h	2940 rpm	5.5 kW [132S–2–B5]	12 L/min	DIN 150	3.6 L	253 kg
DVB 2000	2200 m³/h	2940 rpm	5.5 kW [132S–2–B5]	12 L/min	DIN 150	3.6 L	310 kg
DVB 3000	3000 m³/h	2940 rpm	7.5 kW [132S–2–B5]	12 L/min	DIN 200	3.6 L	405 kg
DVB 4500	4500 m³/h	2945 rpm	11 kW [160M–2–B5]	15 L/min	DIN 250/150	6.5 L	680 kg
DVB 6500	6500 m³/h	2950 rpm	18.5 kW [160L–2–B5]	25 L/min	DIN 300/200	10 L	1160 kg
DVB 9000	9000 m³/h	2960 rpm	22 kW [180M–2–B5]	25 L/min	DIN 350/250	10 L	1400 kg
DVB 11000G	11000 m³/h	2960 rpm	22 kW [180M–2–B5]	33 L/min	DIN 300	10 L	1700 kg
DVB 13500	13500 m³/h	1480 rpm	30 kW [200L–4–B5]	50 L/min	DIN 350/250	20 L	2200 kg
DVB 18000	18000 m³/h	1480 rpm	30 kW [200L–4–B5]	50 L/min	DIN 400/300	20 L	2800 kg
DVB 20000G	20000 m³/h	1480 rpm	30 kW [200L–4–B5]	65 L/min	DIN 400	20 L	3800 kg
DVB 40000G	40000 m³/h	2900 rpm	37 kW [200L–2–B5]	65 L/min	DIN 400	20 L	3800 kg

Product FAQs

1:What total ultimate vacuum can I get when I pair DVB with a dry screw backing pump?

The ultimate vacuum varies by pump stages and backing pump model. Please refer to the performance table for exact values. Dry screw backing pumps deliver better ultimate vacuum compared with liquid‑ring types.

2: Does DVB require special protection if liquid condensate is sucked into the pump?

The vertical gas‑flow design lowers rotor unbalance risk from incoming liquid. Avoid continuous large‑volume liquid ingestion for long‑term service life.

3: Can I upgrade the seal to zero‑leakage for corrosive or hazardous gas applications?

Yes. Standard mechanical seal offers long service life. The optional 5‑point mechanical seal is available for zero‑leakage requirements under corrosive or dangerous gas conditions.

4: What problems will occur if I start DVB directly under atmospheric pressure?

DVB cannot start at atmospheric pressure. Direct startup will cause overload, high torque and potential damage to gears and rotors. A backing pump must pre‑evacuate the inlet before startup.

5: What noise and vibration level can I expect from DVB units?

Integrally cast rotor‑shaft undergoes precision dynamic balancing. Helical timing gears ensure quiet running. Actual noise and vibration depend on operating pressure, rotation speed and complete system installation.Please contact us for further details.

Performance Curves

DVB250-550 Compression Ratio Curve DVB720-1000 Compression Ratio Curve

DVB1500;2000;3000 Compression Ratio Curve DVB4500 Compression Ratio Curve

Dimensions

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