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Trivac B Series

TRIVAC B - Two Stage Oil Sealed Rotary Vane Pumps

The two stage, oil lubricated TRIVAC B is the logical step ahead within the well-proven TRIVAC concept. Here the performance and the characteristics of the pumps have been adapted without compromise to market requirements. The TRIVAC B pumps with their comprehensive range of accessories have proven themselves time and again as rugged pumps in many and varied applications. The ultimate pressure is about 10-4 mbar. The pumping speed, depending on the pump size, TRIVAC D 4 B to TRIVAC D 65 B, is in the range from 4 to 65 3/h (2 to 38 cfm).

Dual stage rotary vane vacuum pumps


TRIVAC B series pumps are oil sealed vacuum pumps based on the rotary vane principle. The oil injected into the pump chamber is used for sealing, lubrication and cooling purposes. The body of the pump is made of separate components with no additional sealing elements. The components are fitted with dowels to ensure easy disassem- bly and re-assembly.

Special features

  • Environment-friendly - Low noise

    - Low vibration

  • Energy saving

    - Low power consumption - Low thermal losses

  • Modern vacuum technology

    • -  High pumping speed right down to the ultimate pressure

    • -  Low ultimate pressure, even with gas ballast

    • -  High water vapor tolerance

    • -  Continuous operation right up to

      1000 mbar

    • -  Built-in oil pump, force-feed

      lubrication sliding bearing

    • -  Minimal inherent air intake

  • Well-proven design

    • -  Compact, air cooled

    • -  Handy, retractable handle

    • -  All controls and oil level check on

      the front side

    • -  Either horizontal or vertical intake

      and exhaust port

    • -  Service-friendly

    • -  Exchangeable inner section

    • -  Pressure-controlled anti-suckback

      valve, no backstreaming of oil

      under any operation conditions

    • -  Installation of mechanical and

      chemical/mechanical full flow oil

      filters possible

    • -  Shaft seals and O-rings are all

      made of elastomer FPM

    • -  Pumps are free of non-ferrous


    • -  Motor protection IP 54


Design Features

Coupling and motor

The pumping section of the TRIVAC B is directly linked to the motor via an elastic coupling element to ensure that the pump runs evenly and smoothly. Type B 14 flanged motors are screwed to the housing of the coupling.

Gas ballast valve

The gas ballast valve is opened and closed by means of a short lever.
By admitting a well controlled amount of air - the gas ballast - it is possible to prevent a certain degree of vapor condensation within the pump.

Exchangeable inner section

The inner section of the pump may be exchanged without special tools or any special knowledge. It consists of all components vital to the operation

of the pump. Exchanging the inner section makes the TRIVAC B as good as new again.

1000 mbar intake pressure

Trouble-free operation even at 1000 mbar intake pressure is ensured by a built-in oil pump, providing force-feed lubrication of the bearings from where a minimum amount of lubricant is fed to the compression and expansion chambers to ensure lubrication of the sliding vanes.


All TRIVAC B basic models (1~ and 3~ motor) are certified in accordance with 94/9/EG (ATEX), Cat. 3 inside.

Additionally there is one pump in every pumping speed class available certified in accordance with 94/9/EG (ATEX), Cat. 3 inside and 3 outside.

For special explosion resistant applica- tions two different TRIVAC D 16 B pump models are available for pum- ping explosive atmospheres out of zone 0. Both models are certified according to 94/9/EG (ATEX) - EC type exam.cert. IBExU03ATEX1017 X and IBExU03ATEX1016 X - Cat. 1 inside and 2 outside.

Surface corrosion

All components are protected against surface corrosion. Non-ferrous metals are not used. The oil box, intake and exhaust line are made of aluminum and only solvent-resistant sealing materials are employed.


All pumps from the D 4 B to the
D 25 B are available with either a single-phase or a three-phase AC motor. Other pumps and motors are available upon request.

Anti-suckback valve

An oil pressure-controlled anti-suck- back valve is built into the intake of the TRIVAC B. During stand-still (as a result of a power failure, for example), the anti-suckback valve blocks the intake to prevent a pressure rise in the connected vacuum system. At the same time, the inner pump body of the TRIVAC is vented. The blocking process will also work correctly when operating the pump with an opened gas ballast valve.

As a result, the backstreaming of any oil from the pump into the vacuum system is effectively prevented. The leak rate of the anti-suckback valve is 3 x 10-5 mbar/ls-1.