WITTE
  • Offer Profile
  • The WITTE Pumps & Technology GmbH stands for efficient and extraordinary pump solutions and has been one of the leading pump manufacturers in the field of precision gear pumps since company founding in 1984. WITTE manufactures standard and special pumps for the chemical, pharmaceutical, food and plastics industry, as well as in the areas of offshore and marine engineering.

    We always strive for new and more efficient developments to provide you with the best possible service. Therefore, we wish to inform you on our pages detailed about our products, developments, services, news and all other areas of our company.

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Product Portfolio
  • Gear pumps

      • Chemical pumps

      • CHEM
        high precision gear pump for conveying low to medium viscosity fluids
        Chemical Pumps for safe and relaible metering tasks


        CHEM gear pump for conveying and metering of fluids with low medium viscosity. The application range goes from classic transfer and metering tasks in the chemical and pharmaceutical industries up to the conveyance of monomers, oligomers and prepolymers during the production of polymers. Decades of experience in construction and an optimum selection of materials, make this type of chemical pump suitable for even the most demanding tasks and are outstanding in their reliability and metering precision in both vacuum and high pressure applications. Typical areas of application for this type of pump are to be found in the chemical, cosmetic, food, petrochemical and polymer industries.

        The CHEM series is also suitable for the food industry, e.g. for conveying butter, margarine or vegetable oils.

        Chemical pumps of this type can be supplied with or without heating.. The WITTE modular construction system for friction bearings, gear and shaft seals offers a maximum of flexibility for the end customer.

        Different designs for different tasks
        • CHEM: Chemical gear pump standard version
        • CHEM MINI: Mini chemical pump for finest metering and dosing tasks
        • CHEM MAGNET: Chemical gear pump with magnetic coupling for critical media


        Technical Features

        • Housing:
          Non-alloyed and alloyed steels · tantalum · titanium · Hastelloy · ceramic
        • Gears: 1.4112 but also all other processable ceramics and metals, e.g. 1.4571, Ferralium, ferro titanite Hastelloy, etc. ·
          with optional surface coating · spur gearing
        • Friction Bearings:
          Carbon · NiAg (nickel-silver) · silicon carbide · zirconium oxide · tool steel · Al-bronze · special materials · with optional surface coating
        • Shaft Seals:
          Single mechanical seal (ED) · Single mechanical seal with buffer fluid (AD) · Double mechanical seal with buffer fluid (DD) · magnetic coupling · stuffing box · viscoseal
        • Heating Systems:
          Steam · water · heat transfer oil · electrical

        Operating Parameters

        • Viscosity: 0.5 to 1000000 mPas (cP)
        • Temperature: Up to 300°C  (580°F)
          higher temperatures upon request
        • Inlet pressure: Vacuum of max. 15 bar (215 psig)
          higher with magnetic drive
        • Conveying Pressure / Differential Pressure: Up to 120 bar (1740 psig)
        • Pump Sizes: From 22/6 (1.28 ccm/rev – 20 l/h) to 280/280 (12000 ccm/rev – 170000 l/h).

        The values listed are maximum values and must not coincide under certain circumstances.

      • Polymer discharge pumps

      • POLY
        high-pressure gear pump for the discharge of medium to high viscosity media from the reactor. The extra large inlet opening guarantees an even flow of product to the gearwheels even under vacuum or extremely low NPSH conditions.

        Offered with either a round inlet port, by means of which the suction flange of the pump is directly connected to the outlet flange of the reactor or as a low NPSH version, where the pump is connected between the pump and reactor flanges, in order to achieve an even larger and shorter inlet port.


        Technical Features

        • Housing:
          Non-alloyed and alloyed steels · cast steel
          with optional surface coating
        • Gears:
          Nitrated steel · tool steel · special steel
          with optional surface coating · helical gearing · herringbone gearing
        • Friction Bearings:
          Tool steel · NiAg (nickel-silver) · Al-bronze · special materials · with optional surface coating
        • Shaft Seals:
          (Vacuum) viscoseal · stuffing box · combination of viscoseal and stuffing box · double-action, buffered mechanical seal
        • Heating Systems:
          Heat transfer oil · steam

        Operating Parameters

        • Viscosity: up to 40000 Pas
        • Temperature: up to 350°C (662°F)
        • Inlet pressure: Vacuum to max. 40 bar (580 psig)
        • Differential Pressure: Up to 250 bar (3225 psig)
        • Pump Sizes: From 22/22 (4.7 cm3/U - 10 kg/h) up to 280/280 (12,000 cm3/U - 30,000 kg/h). Intermediate sizes, with wider gear wheels for lower differential pressure, are available as standard, e.g. 152/254 (3,170 cm3/U).

        The values listed are maximum values and must not coincide under certain circumstances.

      • Booster Pumps

      • BOOSTER
        Gear pump for polymer processing
        The reliable transfer and booster gear pump
        .

        BOOSTER gear pumps are used in the polymerisation process, to boost the pressure of medium to high viscosity media. They transport pre-polymers and polymers, e.g. PET, PBT, PS, ABS any many more, very gently Heating is either by way of heat transfer oil or steam.

        The core components like shafts and friction bearings originate from the WITTE building block system.


        Technical Features

        • Housing:
          Heat resistant carbon steel, e.g. 1.6582 · rust-free stainless steel 1.4313
          with optional coating
        • Gears:
          Tool steel · nitrated steel · special steel · with optional surface coating · helical gearing · herringbone gearing (for extremely low-pulsation conveyance)
        • Friction Bearings:
          Tool steel · NiAg (nickel-silver) · Al-bronze · special materials · with optional surface coating
        • Shaft Seal:
          Viscoseal · stuffing box · (Vacuum viscoseal)
        • Heating Systems:
          Heat transfer oil · steam

        Operating Parameters

        • Viscosity: up to 40000 Pas
        • Temperature: up to 350°C (660°F)
        • Inlet pressure: Vacuum up to max. 120 bar (1740 psig)
        • Differential Pressure: Up to 250 bar (3225 psig)
        • Pump Sizes: From 22/22 (4.7 cm3/U - 10 kg/h) up to 280/280 (12000 cm3/U - 30000 kg/h).

        The values listed are maximum values and must not coincide under certain circumstances.

      • Extrusion pumps

      • EXTRU
        The reliable melt pump for extrusion


        The EXTRU is mainly used in conjunction with extruders or kneaders. It reduces the natural pulsation and irregular conveyance, particularly in single-screw extruders, added to which, the build up of pressure in the gear pump is more efficient in comparison to the extruder. Because of this, less energy or heat is transferred into the polymer and the product is conveyed in a gentler manner. The EXTRU melt pump is indispensable for the manufacture of precision films or micro granulate.

        The robust construction and low wear materials make the EXTRU indispensable for extrusions. Special versions are available for conveying natural rubber and soft PVC. The WITTE quick colour change version lends itself particularly to master batch applications with frequent changes of colour.

        In order to prevent the extrusion pump's drive shaft from being driven/pushed out of the housing when there is a high pressure on the suction side (extruder conveying pressure), the drive shaft must be relieved. It protrudes from both sides of the housing and is sealed, so that atmospheric pressure predominates on both sides of the drive shaft. The shaft is thus relieved.

        Technical Features

        • Housing:
          Heat resistant carbon steel, e.g. 1.6582 · rust-free stainless steel 1.4313 ·
          with optional coating
        • Gears:
          Tool steel · nitrated steel · special steel · with optional surface coating · helical gearing · herringbone gearing (for extremely low-pulsation conveyance)
        • Friction Bearings:
          Tool steel · NiAg (nickel-silver) · Al-bronze · special materials · with optional surface coating
        • Shaft Seal:
          Viscoseal · stuffing box
        • Heating Systems:
          Electrically, by means of heating cartridges · optional cover heating

        Operating Parameters

        • Viscosity: up to 40000 Pas
        • Temperature: up to 400°C (752°F)
        • Inlet pressure: Up to max. 120 bar (1740 psig)
        • Differential Pressure: Up to 250 bar (3625 psig) ·
          special models also available for higher pressure differentials
        • Pump Sizes: From 22/22 (4.7 cm3/U - 10 kg/h) up to 280/280 (12000 cm3/U)
          Intermediate sizes, with narrower gear wheels for higher differential pressure, are possible, e.g. 140/90 (690 cm3/U).

        The values listed are maximum values and must not coincide under certain circumstances.

      • Food stuff pumps

      • PURO
        Precision gear pump for the food Industries
        Easy to clean and individually tuneable


        Stainless steel precision gear pump for conveying and metering of fluids with medium to low viscosity. Through decades of experience in design and selection of optimal materials, this type of pump suitable for even the toughest of tasks and impresses with its reliability and metering accuracy in the vacuum as well as high-pressure applications. Typical areas of application for this type of pump are to be found in the cosmetic and food industries e.g. for conveying butter, margarine or vegetable oils. Pumps of this type can be supplied with or without heating (hydraulic or electric). The modular construction system for WITTE bearings, gears and shaft seals offers a maximum dimension of flexibility for the user. For better cleaning the pump has different flushing connections. An industry leading special design of this pump helps to minimize dead spots.


        Technical Features

        • Housing:
          stainless steel • tantalum • titanium • hastelloy
        • Gears:
          DIN 1.4112 standard • examples of optional materials include ferralium • DIN 1.4571 • hastelloy • ferro titanite •
          and other available included coated options
        • Friction Bearings:
          NiAg (nickel-silver) • zirconium oxide • silicon carbide • other materials on request
        • Shaft Seals: Single mechanical seal • magnetic coupling • mechanical seals of other suppliers are available as an option (with FDA approval)
        • Heating Systems:
          hydraulic or electric

        Operating Parameters

        • Viscosity: up to 500.000 mPas
        • Temperature: up to 200°C
        • Inlet Pressure: Vacuum to max 15 bar  (215 psig)
        • Differential Pressure: up to 120 bar (1740 psig)
        • Conveying Pressure:  up to max. 135 bar (1958 psig
        • Pump Sizes: From 22/13 to 180/180.

        The values listed are maximum values and must not coincide under certain circumstances.

      • Mini Pumps

      • CHEM MINI
        Gear pump for conveying and metering of fluids with low to medium viscosity.
        The CHEM MINI gear pump is particularly suitable for precision metering tasks of low to medium viscosity media.


        The application range goes from classic transfer and metering tasks in the chemical and pharmaceutical industries up to the conveyance of monomers, oligomers and prepolymers during the production of polymers. Decades of experience in design and an optimum selection of materials, make this type of pump suitable for even the most demanding tasks and are outstanding in their reliability and metering precision in both vacuum and high pressure applications.

        Typical areas of application for this type of pump are to be found in the chemical, cosmetic, food industry, and in the petrochemical industry.

        The CHEM MINI takes fine metering tasks with high precision. Currently the smallest available pump has a specific volume of 0,2 cm3/rev. Smaller pumps are available upon request. For this series are many different materials available for housing, gears and end plates.


        Technical Features

        • Housing:
          Stainless steels, tantalum, titanium, Hastelloy®
        • Gears:
          1.4112 (440B) but also all other processable ceramics and metals, e.g. 1.4571 (316Ti), Ferralium®, Ferro Titanite®, Hastelloy®, etc.,
          optional: surface coating,
        • Friction Bearings:
          Carbon, NiAg (nickel-silver), silicon carbide, zirconium oxide, tool steel, Al-bronze, optional: special materials,  surface coating
        • Shaft Seals:
          Single mechanical seal (ED) • Single mechanical seal with buffer fluid (AD) • Double mechanical seal with buffer fluid (DD) • Magnetic coupling, stuffing box,
        • Heating System:
          Steam, water, heat transfer oil, electrical

        Operating Parameters

        • Viscosity: 0,5 to 1.000.000 mPas
        • Temperature: up to 300 °C (580 °F), 
          higher temperatures upon request
        • Suction Pressure: Vacuum to max. 15 bar (215 psig),
          magnetic drive to max. 25 bar (363 psig)
        • Differential Pressure: Up to 120 bar (1.740 psig) 

        The values listed are maximum values and must not coincide under certain circumstances.

      • Gear pumps with magnetic coupling

      • CHEM MAGNET
        seal design for safe operation with critical media
        Chemical gear pump with magnetic coupling


        The CHEM Magnet is in principle constructed in the same way as the CHEM but with a synchronous magnetic coupling forming the shaft seal. This operates slip-free, i.e. the pump speed is always the same as the shaft speed, as long as the load torque does not exceed the nominal torque of the magnetic coupling.

        The magnetic coupling lends itself to conveying poisonous or flammable substances, as well as for operation at high system pressures. Special versions can be used for inlet pressures of up to 700 bar (10152 psig).

        The containment shell of the magnetic coupling can be of the double-walled type. The double wall serves heating the coupling can. The double-walled containment shell can be provided with a leakage-monitoring system for particularly critical processes. The containment shell is filled with inert gas, in order to detect damage. If this gas escapes to the inside or outside, depending upon which wall is damaged, a pressure sensor will trigger an alarm. Because one wall of the double-walled containment shell is still intact, the possibility of the hazardous medium being conveyed leaking into the environment will be eliminated.

        A particular highlight of the WITTE - Magnetic Coupling is the inner magnetic rotor's separate bearing. This ensures that only torque is transferred to the pump's drive shaft. The relatively heavy weight of the inner rotor is taken up by this bearing, thus relieving the pump's bearings.

        WITTE's flange bearing design offers the additional advantage of preventing the inner totor from touching and damaging the containment shell. In competitor´s design it is possible for the inner rotor to touch the containment shell after pump bearings wear. Our design provides the safty of an additional bearing to insure the inner rotor can not touch the containment shell.


        Technical Features

        • Housing:
          Non-alloyed and alloyed steels · tantalum · titanium · Hastelloy · ceramic
        • Gears:
          1.4112 but also all other processable ceramics and metals, e.g. 1.4571, Ferralium, ferro titanite Hastelloy, etc. · with optional surface coating · spur gearing
        • Friction Bearings:
          Carbon · NiAg (nickel-silver) · silicon carbide · zirconium oxide · tool steel · Al-bronze · special materials ·
          with optional surface coating
        • Shaft Seals:
          Single mechanical seal (ED) · Single mechanical seal with buffer fluid (AD) · Double mechanical seal with buffer fluid (DD) · magnetic coupling · stuffing box · viscoseal
        • Heating Systems:
          Steam · water · heat transfer oil · electrical

        Operating Parameters

        • Viscosity: 0.5 to 1000000 mPas (cP)
        • Temperature: Up to 300°C  (580°F) ·
          higher temperatures upon request
        • Inlet pressure: Vacuum of max. 15 bar (215 psig),
          higher with magnetic drive
        • Conveying Pressure / Differential Pressure: Up to 120 bar (1740 psig)
        • Pump Sizes: From 22/6 (1.28 ccm/rev – 20 l/h) to 280/280 (12000 ccm/rev – 170000 l/h).

        The values listed are maximum values and must not coincide under certain circumstances.

      • Special pumps

      • In additional to our standard pumps, we offer a wide range of special pumps, e.g. made of ceramic, tantalum, titanium or immersion pumps. Many of these pumps are custom built to suit the application in question and its specific operating parameters. WITTE for example produced on such pump, made completely of ceramic, for transporting a highly corrosive medium at temperatures of up to 550°C.
    • Shaft Seals

        • Single mechanical seal (ED)

        • The single mechanical seal (ED) is the standard seal for WITTE CHEM pumps. It is suitable for max. viscosity of 10 to 50 Pas.

          • Min. suction pressure: 1 bar (15 psig)
          • Max. suction pressure: 15 bar (215 psig)
          • Max. temprature: 300°C (580°F)
          • Viscosity; 0,2 to 50.000 mPas (cP)
        • Vacuum mechanical seal (AD), buffered

        • The single mechanical seal with buffered fluid (AD) in specially designed for vacuum conditions on the suction side. It is suitable for maximum viscosity of 100 Pas.

          • Min. suction pressure: vacuum
          • Max. suction pressure: 5 bag (75 psig)
          • Max. temperature: 250°C (500°F)
          • Viscosity: 0,2 to 100.000 mPas (cP)
        • Double mechanical seal (DD), buffered

        • The double mechanical seal with buffered fluid (DD) is suitable for a max. viscosity of 1.000 Pas, because the internal parts of the mechanical seal do not get in contact with the pumped fluid. All the internal parts are lubricated by the buffer fluid. The pressure on the suction side can be within a wide range: from vacuum conditions to max. 15 bar.

          • Min. suction pressure: Vacuum
          • Max. suction pressure: 15 bar (psig)
          • Max. temperature: 300°C (580°F)
          • Viscosity: 0,2 to 1.000.000 mPas (cP)
        • CHEM MAGNET – with magnetic coupling – seal design for safe operation with critical media

        • The CHEM Magnet is in principle constructed in the same way as the CHEM but with a synchronous magnetic coupling forming the shaft seal. This operates slip-free, i.e. the pump speed is always the same as the shaft speed, as long as the load torque does not exceed the nominal torque of the magnetic coupling.

          The magnetic coupling lends itself to conveying poisonous or flammable substances, as well as for operation at high system pressures. Special versions can be used for inlet pressures of up to 700 bar (10152 psig).

          The containment shell of the magnetic coupling can be of the double-walled type. The double wall serves heating the coupling can. The double-walled containment shell can be provided with a leakage-monitoring system for particularly critical processes. The containment shell is filled with inert gas, in order to detect damage. If this gas escapes to the inside or outside, depending upon which wall is damaged, a pressure sensor will trigger an alarm. Because one wall of the double-walled containment shell is still intact, the possibility of the hazardous medium being conveyed leaking into the environment will be eliminated.

          A particular highlight of the WITTE - Magnetic Coupling is the inner magnetic rotor's separate bearing. This ensures that only torque is transferred to the pump's drive shaft. The relatively heavy weight of the inner rotor is taken up by this bearing, thus relieving the pump's bearings.

          WITTE's flange bearing design offers the additional advantage of preventing the inner totor from touching and damaging the containment shell. In competitor´s design it is possible for the inner rotor to touch the containment shell after pump bearings wear. Our design provides the safty of an additional bearing to insure the inner rotor can not touch the containment shell.

          • Suction pressure: vacuum to max. 700 bar (10.150 psig)
          • Differential pressure: max. 120 bar (1.740 psig)
          • Temperature: max. 500°C (1000°F)
          • Viscosity: 0,5 to max. 30.000mPas (cP)
          • Output: 20 to max 20.000l/h
        • Viscoseal

        • The viscoseal is a dynamic seal that can be heated or cooled. It is the standard seal for WITTE EXTRU pumps. It is a dynamic sealing system. Its operative range is limited by the suction pressure and the viscosity of the fluid. The min. viscosity for this sealing system is approximate 10 Pas. To increase viscosity the viscoseal can be cooled.

          • Max. temperature: 450°C (850°F)
          • Viscosity: 10.000 to 40.000.000 mPas (cP)
        • Vakuum viscoseal with stuffing box

        • The vacuum viscoseal with buffered stuffing box is the standard seal for WITTE POLY pumps. It is a combination of a dynamic (viscoseal) and a static (stuffing box) sealing system. The polymer flow back to the suction side is adjusted by a needle valve. The fluid barrier ensures that no air from the atmosphere gets in the pump/reactor. There is a buffered and heated stuffing box for back-up. To prevent failure/destruction of the packings, it is strongly recommended to heat the area of the stuffing box.
        • Stuffing box

        • The stuffing box is a simple seal for WITTE gear pumps. The operative range is similar to the viscoseal. It is suitable from low to high viscosities. The standard material for the packing rings is graphite (other materials are available). It is also available with buffered fluid and/or heating jacket.
      • Special Gear Design

          • Spur Gear Design

            • standard for high pressure gear pumps
            • best volumetric efficiency
            • no axial thrust
          • Helical Gear Design

            • standard for high pressure gear pumps
            • best volumetric efficiency
            • no axial thrust
          • Herringbone Gear Design

          • The herringbone gearing reduces the pulsation of the medium being conveyed in comparison to straight and helical gearing. This is a great advantage, particularly for polymers.

            Products with a high solids content are conveyed better, as the product is more easily displaced from between spaces between the teeth. The polymer is also subjected to less stress. This is particularly advantageous for highly sensitive polymers, as both shearing and heating effects are reduced during the pumping process.

            Existing gear pumps can be converted to herringbone gearing. This merely entails replacement of the friction bearings and shafts. Sizes available are: 4 (45/45) to 11 (224/224).

            • lowest pulsation
            • no axial thrust
            • optimized temperature profile across rubber flow