Multi-stage Roots Pumps - Pfeiffer Vacuum

Air cooled

With our ACP Low Noise Kits, we offer a range of complete packages specifically designed for applications that require a quiet environment, such as in the lab. These each consist of a multi-stage Roots pump, the Pfeiffer Vacuum ACP and a sound insulation housing SEK. The Sound enclosure kit SEK reduces the sound pressure level from 61 dB (A) at final pressure at the intake flange by up to 10 dB (A) to 51 dB (A). Simply select your suitable kit based on the pumping speed in classes 15, 28 and 40 m³ / h.
  • The Now Noise ACP Kits are available in different pumping speed classes from 15, 28 an 40 m³/h
  • Convenient Sound enclosure kit SEK 15/28/40 in the kid included
The pump is designed for applications that require pumping of clean (dust-free) and non corrosive gases. Standard pumps are equipped with a gas ballast device to improve pumping of light gases and avoid condensation vapors inside the pump. Three gas ballast options to satisfy customer needs.
G version pump is compatible with trace amounts of corrosive gases. Three jets located in the purge line help withstand trace amounts of corrosive chemicals, protect the low and high pressure ball bearings. For optimal ball bearing protection, the neutral gas pressure must be set to 0.3 bar (relative pressure) according to the flow rate value provided in technical data.
CV versions extend the pure water vapor capacity up to 1,000 g/h (at 100 mbar and 30 °C ambient temperature). A high gas ballast flow warms up the pump and dilutes condensable gases (> 2 N.m3/h or 33 slm at 1 bar abs.). The external drainable silencer recovers liquid from the lowest point of the exhaust stage. A gas purge line injection device helps to protect lips seals and ball bearings from condensable vapors.
The pump is designed for applications that require pumping of clean (dust-free) and non corrosive gases where presence of Fluorine is not permitted. SH pumps are equipped with a gas ballast device to improve pumping of light gases and avoid condensation vapors inside the pump. Three gas ballast options to satisfy customer needs.
The pump is designed for applications where gases are recirculated or recovered. Gas must be clean (dust-free) and non corrosive. CP pumps are not equipped with a gas ballast to avoid any misuse of the pump. The gear box is equipped with a vacuum port that can facilitate initial pumping of the installation before filling with recirculation gas. Leak tightness of the pump is improved.

Dry Compact Multi-stage Roots Pumps

Clean Vacuum. High Reliability.
The multi-stage Roots pump technology of the ACP series meets the requirements of applications where clean and dry vacuum is needed.


  • Best solution – Ideal replacement for scroll and oil-sealed pumps
  • Air cooling – No installation and operational costs for water supply
  • Frequency converter – Hour meter, remote operation mode (RS-485, dry contacts), multiple rotational speed selection (power saving, noise reduction, adaptation to application cycle)
  • Several gas port options – Purge gas, gas ballast, other specific ports according to application
  • Universal power supply – Wide voltage supply 50/60 Hz single-phase and three-phase
  • Standards – Compliance with CE standards, UL/CSA certified, SEMI S2 certified


  • Surface analyzers
  • Leak detectors
  • Particle accelerators
  • Turbo pumping stations
  • Laboratories
  • Lamp manufacturing
  • Gas industry (cleaning and filling of bottles or tanks)
  • Freeze drying
  • Laser (gas recycling)
  • Vacuum coating
  • Cryo pumps regeneration
  • Plasma cleaning
  • Drying, cleaning
  • Load-lock

Series at a glance

SD-versions for applications with dust-free, non-corrosive gases
The SD-version is designed for applications with clean (dust-free) and non-corrosive gases. The standard pumps are equipped with gas ballast equipment in order to improve the pumping of light gases and to avoid the condensation of steam inside the pumps. Three gas ballast options fulfill the customer requirements as needed.

G-versions for usage by low quantities of corrosive gases
The G-version may transport traces of corrosive gases. An inert flushing gas protects low pressure and high pressure bearings and dilutes the corrosive mediums in the suction chamber.

CV-versions for applications with condensible vapors
The CV-version is specially designed for avoiding vapor condensation inside the pump block. This occurs through:

  • A high gas ballast throughput for heating up pumps and diluting condensable gases.
  • A silencer with drain screws for releasing liquid at the lowest point of the exhaust.
  • Flushing gas injection to protect the ball bearing and the shaft seals.

The CV version has a water vapor capacity of up to 1,000 grams per hour.

SH-versions for particle accelerators
The ACP SH version is Fluorine free to pump in environments where Fluorine is forbidden such R&D or industrial applications where NEG (Non Evaporable Getter) pumps are used. Lubricants and elastomers are free of Fluorine.

R versions for hot zones of particle accelerators
The ACP R version is based on the SH version and equipped with remote electronics. The possibility to remove the electronics is important when the pump is installed close to radiations. Detached electronics can be installed up to 100 meters away from the pump.

CP-versions for management of high value gases
The ACP CP version was defined to match with features requested by gas recirculation such as for He3/He4 refrigerator or laser applications. The pumps meet an unrivaled vacuum leak tightness (better than 5 • 10-9 bar m3/h) to avoid any contamination of treated gases by the environment. The ACP CP version is also equipped with an additional vacuum port to make initial evacuation of the pump easy and fast. Such a pump is also very popular for gas recovery applications such as noble gas recovery but not limited to this.

No particle contamination
The frictionless pumping module is optimized to operate without internal lubricant and provides outstanding oil-free vacuum with no hydrocarbon vapor back streaming. Without any seals between rotor and stator no particles are generated. ACPs provide hydrocarbon and particle free really clean vacuum.

High reliability
The absence of wearing parts inside the pumping module allows for unsurpassed long-term stability and high reliability in even the most demanding applications.

Constant performances
The frequency converter driven motor provides constant rotational speed, thus stable pumping speed and consistent ultimate pressure are achieved all over the world.

Low maintenance costs
Our ACP pumps require overhaul only every 22,000 hours of operation for the ACP 28/40 and 20,000 hours of operation for the ACP 15 resulting in low cost of ownership.

Condensable vapor ability
High flow gas ballast ports and drainable silencers allow the ACP to pump high amounts of condensable vapors (up to 1,000 g/h of pure water vapor).

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