GATHER Gear pump

Precise pump technology for non-lubricating liquids

Precise pump technology for non-lubricating liquids

The magnetically coupled GATHER Gear pump is  a hermetically sealed dosing and process pump. In numerous industrial sectors (chemicals, pharmaceuticals, food, medicine, cosmetics, etc.) it is mainly used for the pulsation-free delivery or metering of non-lubricating liquids (e.g. water, salt solutions, acids, alkalis, solvents, etc.). 


  • 1. Magnetic coupling – hermetically sealed
  • 2. Pulsation-free delivery & dosing
  • 3. Non-lubricating liquids
  • 4. Cooling magnetic system & slide bearings
  • 5. Robust design and long service life
  • 6. CIP- and SIP capable, if desired

The new series 3 for higher flow rates

GATHER is consequently continuing the further development of the pump program with the series 3. The newly developed process pump achieves flow rates up to 4.000 l/h (with a differential pressure up to 14 bar). The pump is suitable for the delivery or metering of lubricating and especially non-lubricating liquids such as water, salt solutions, acids, alkalis and solvents. Based on our proven technology, the wide selection of materials and our know-how, we will find the right solution for your application.

Please contact us!

pump for high flow rates

From laboratory pump to high-precision process pump

The GATHER gear pump was originally developed for degassing water in medical technology. This special type of pump has been further developed from a special laboratory pump to a high-precision pump for, amongst others, the chemical industry and water management, and enables pumping tasks involving a large volume flow range (20ml up to 4000l/h) with a differential pressure up to Δpmax = 20 bar.

The possibility of operating non-lubricating liquids within the viscosity range from 0.1 to 2000 mPa s (cP) is attained, amongst other things, by means of different and high-precision processed  materials. The pump housing and gear shafts are made of stainless steel, Hastelloy® or Titan, the slide bearings of carbon or plastics such as PEEK or PTFE. The gear wheels are made of a nickel-based alloy, PEEK or PTFE (Teflon®) and can be freely combined with each other. The materials used for gear wheel and slide bearings all have excellent tribological properties.

Internal rinsing channels and holes direct a small portion of the flow rate from the discharge side through the slide bearings back to the suction side. This results in the internal cooling of the magnet system and the slide bearings. Additionally, the necessary sliding film is produced on the slide bearings which ensures a durable function. 

If aqueous liquids are delivered, there will be no dead spaces in the pump. This effect can be exploited for cleaning in place (CIP) by means of a solvent or cleaning agent. This is also the basis for a SIP pump (SIP – sterilization in place) which can be sterilzed in the installed state and is mainly used in the pharmaceutical industry.

Since the gear pump has a speed-dependent flow rate characteristics,  delivery rates can be adjusted via the engine speed. The speed of the motors can be adjusted manually with a potentiometer or controlled externally via a control current or line voltage. Due to its delivery characteristics and in conjunction with a suitable drive, the GATHER gear pump can be easily integrated into a control loop (or PLC).  

With the right pump design, selection of materials and design of the drive unit we find the solution which enables our customers to work with process reliability. This also includes the design as a complete system with corresponding control circuit and accessories according to the customer’s specifications. Special solutions are our speciality. This also involves the use in potentially explosive atmospheres in compliance with the ATEX directives.

GATHER Gear pump

At a glance

1. Magnetic coupling – hermetically sealed

The magnetic coupling ensures contactless torque transmission from the drive to the pump shaft. Unlike mechanical seals, it is not subject to wear and tear and is absolutely maintenance-free. It is hermetically sealed and there is no leakage of the pumped medium. This is a decisive factor, especially with concentrated, aggressive media and those that are hazardous to health. In addition, it allows easy pump head replacement in practice. 

2. Pulsation-free delivery & metering – modular system for large operating range

Due to the functional principle of the gear pump (displacement pump), a practically pulsation-free, flexibly adjustable flow rate can be attained. The speed-dependent delivery characteristic enables a wide flow rate range with differential pressures up to 20 bar. In three modular series,  flow rates within operating ranges between 20 ml and 4000 l per hour can be achieved.

3. Use of non-lubricating liquids – GATHER materials expertise

Operation with non-lubrication liquids is made possible, amongst other things, by using chemically resistant and high-precision manufactured pump materials. The pump housing and shafts are made of stainless steel, Hastelloy® or titanium, the slide bearings e.g. of carbon or plastic. Depending on the application and medium, nickel alloys, PEEK or PTFE  (Teflon®) are used for the gears. The gear and slide bearings materials have the required tribological properties for many years of operation.

4. Cooling magnetic system & slide bearings by internal circulation

Internal flushing channels and holes convey a small part of the flow from the delivery side through the slide bearings and back to the suction side. This leads to the internal cooling of the magnetic system and the slide bearings. In addition, the necessary sliding film is created on the slide bearings which ensures a long-lasting function.

5. Robust design and long service life

The use of the magnetic coupling, the internal cooling system, the high precision of the components and the double-volute construction of the pump housing result in a very robust design with an extremely long service life.  Depending on the application (medium), the pumps operate maintenance-free.

6. CIP – and if desired – SIP capability

GATHER pumps are CIP-capable (Cleaning in Place) and, if desired, SIP-capable (Sterilization in Place). Via the existing channels, flushing processes using suitable solvents and media can be carried out in the installed state. The SIP version is used very frequently, especially in the pharmaceutical industry.

GATHER Gear pump

Operating data at a glance

Materials housing & shafts

Stainless steel, Hastelloy®, titanium and special alloys

Materials gears

Nickel alloy, PEEK, PTFE (Teflon®), etc.

Materials slide bearings

Carbon, PEEK, PTFE (Teflon®), SSiC, etc.


Non-lubricating and lubricating liquids

Flow rate / differential pressure
see flow rate characteristics
Series 1

0,02 up to 360 l/h, up to 20 bar

Series 2

5,0 up to 2000 l/h, up to 20 bar

Series 3

60 up to 4000 l/h, up to 14 bar


T = –60 up to +300°C (as special version –200 up to +450°C)

  • Cleaning in Place (CIP)
  • Sterilization in Place (SIP) upon request
Explosion classes

Locations 1, 2 and 22, temperature classes T1…T6 resp. 100 K below glowing temperature of dust deposits (location 22)

Do you have any questions about the GATHER gear pump?

GATHER Industrie

GATHER Industrie GmbH
Lise-Meitner-Straße 4
42489 Wülfrath

ISO Zertifizierung