LEWA bellows pulsators

LEWA Bellows Pulsators

LEWA bellows pulsators are a great choice whenever it comes to separating a substance mixture using extraction.

They are used to drive extraction columns (sieve tray or packed columns) because their adjustable amplitude and frequency enables them to deliver perfect substance mixture separation results. LEWA bellows pulsators have a pulsating volume from 200 cm3 to 21 land a maximum column height of 18 m.

LEWA Bellows Pulsators

Simple and economical separation of substance mixtures.

The chemical and pharmaceutical industry in particular require systems for separating substance mixtures. The technology and costs associated with this application mean that it is often practical to rely on extraction rather than rectification. This is exactly where the LEWA bellows pulsator comes in.

A pulsating movement drives an extraction column that separates the substance mixture. The bellows pulsator is the perfect system for generating this oscillating liquid movement in a vertical vessel.

LEWA bellows pulsators

Good reasons to choose a LEWA bellows pulsator

Metering of flulids in harmonic motion

Movement in almost total harmony

The pulsation characteristic exerted by the bellows on the liquid column is a movement that works in almost total harmony. This enables low acceleration forces and, therefore, low compressive stress on the bellows. As a result, the entire system is protected and maintenance times kept to a minimum.

Highly efficient drive

The bellows pulsator is powered with exceptional efficiency thanks to mechanical drive units from the LEWA modular system. We use drive units with either a constant stroke length or continuous stroke length adjustment. A three-phase motor adjusts the stroke frequency.

Long service life and reliability

We guarantee an extremely long service life for our systems: from 8000 to 15000 operating hours. Thanks to a probe monitoring system, we can also prevent loss of production. The bellows pulsator is leakage-free during operation, protecting operating personnel.

Lower operating costs thanks to our pressure equalization system

A gas cushion-supported pressure equalization system extends the service life of the bellows and minimizes drive energy. This allows you to reduce operating costs by a significant degree, especially at high pulsation volumes and extensive column heights.

Adjustable frequency and amplitude range

You can adjust the frequency and amplitude range to ensure perfect separation results.

Gentle pulsation

Gentle pulsation is particularly important for sensitive media to prevent damage to the liquid.

Low noise level

LEW bellows pulsators are characterized by a particularly low noise level.


Continuous or constant stroke length adjustment

You have a choice between a continous or constant stroke length adjustment - individually and precisely tailored to your application.

Bellow / leakage monitoring

Integrated bellow and leakage monitoring systems not only provide high reliability in production, but also ensure a durable machine.

Conductive PTFE bellow

Equipped with special materials for special applications: If you wish, we can implement a conductive PTFE bellow into your bellows pulsator.

Adapted connection geometries

For the smooth installation in your extraction system, we adapt the connection geometries of the bellows pulsator flexibly to your extraction column.

Tests according to your specifications

Before starting up the system, we conduct well-documented test runs according to relevant international standards or to your specifications.

International standards

LEWA is ISO 9001 certified. Pumps, systems and units are compliant with all major international standards such as, API, ASME, TÜV and many more.

Global commissioning

With our global service network, we take your equipment into operation and provide technical service directly at your location - both onshore and offshore.

Complete documentation

Receive supporting documents and certificates, including the operating instructions, as well as design and test details in different languages.

Maintenance and service

No matter if maintenance, spare parts or repair - our service technicians are well trained and available worldwide. Thus, we guarantee fast response and smooth operations.

Technical data

The LEWA bellows pulsators use drive units that are put together using the tried-and-tested LEWA modular system. This ensures that exactly the required performance is available for every application. To date, we have implemented a maximum column height of 18 m and pulsating volumes between 200 cm³ and 21 l. These key figures only show the minimum/maximum values engineered so far – column heights and volumes beyond this are still possible.

Drive unit data

TypeStroke length [mm]Plunger rod force [N]

Installation dimensions

TypeL [mm]W [mm]ΔW [mm]H [mm]


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