Double-Diaphragm Gas Pumps

Oil-free pump series with design for increased safety

  • Double-Diaphragm Gas Pumps
    Double-Diaphragm Gas Pumps

The N 630 is an all-rounder within the KNF modular system. The oil-free diaphragm gas pump transfers and compresses gases and vapors and generates a vacuum without contaminating the media. Therefore, it finds use in many applications in research, energy technology, process manufacturing, and the chemical and petrochemical industry. KNF continues to expand the N 630 pump series to keep pace with the broad spectrum of applications. Six new models with double diaphragms are geared towards users who work with valuable and hazardous gases. Even if the working diaphragm should fail, no gas will escape, thanks to the safety diaphragm installed underneath. All of the new models can be equipped with an external sensor to monitor the state of the working diaphragm.

High gas tightness

Based on actual field data, pump gas tightness can be modified from the normal 5 × 10-5 mbar × l/sec to an increased 6 × 10-6 mbar × l/sec. The high gas tightness of N 630 is particularly well suited for transporting helium and its rare/costly isotopes. The N 630 with a double diaphragm securely transfers the uncontaminated noble gas for recycling. This pump is also particularly useful for cryostat applications, where it reliably compresses the helium cooling medium.

Availability in Ex and non-Ex versions

Different options are available for application-specific requirements. Users can choose between Ex and non-Ex versions of the double-diaphragm N 630, each available in a single-head model or a model with two heads connected in parallel or in series. An optional water-cooling system can also be installed to enhance non-Ex versions to handle ambient and media temperatures of up to 60 degrees Celsius.

The non-Ex versions are equipped with either a EPDM or PTFE-coated diaphragm, the Ex-version exclusively with a PTFE-coated diaphragm. All versions have the same performance parameters: a flow rate of up to 68 l/min, an ultimate vacuum of up to 25 mbar abs. and pressure of up to 3 bar g. The protection class of all versions of the pump is IP20. The motor offers IP55 protection, can be used at 50 or 60 Hz and is designed to be operated with a variable frequency drive.

Outstanding isolation from vibration and minimized noise levels

The N 630 comes standard with affixed base rails. This, in combination with the affixed shock mounts, leads to outstanding isolation from vibration and minimized noise during operation. The N 630 fulfills the criteria for completed machinery pursuant to machinery directive 2006/42/EC and therefore comes with the CE marking.