CHEM – high precision gear pump for conveying low to medium viscosity fluids

CHEM gear pump for conveying and metering of fluids with low to 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 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. Pumps of this type can be supplied with or without heating. The WITTE modular construction system for bearings, gears and shaft seals offers a maximum of flexibility for the end customer.

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    Technical Features


    Non-alloyed and alloyed steels . tantalum . titanium . Hastelloy . ceramic


    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 . Albronze . 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

    0.5 to 10000000 mPas (cP)


    Up to 300°C (580° F) . higher temperatures upon request

    Inlet pressure

    Vacuum to max. 15 bar (215 psig), higher with magnetic drive

    Conveying Pressure / Differential Pressure

    Up to 120 bar (1740 psig)

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

    Pump Sizes

    From 22/6 (1.28 ccm/rev – 20 l/h) to 280/280 (12000 ccm/rev-170000 l/h). Larger sizes available upon request.

    Application Examples
    Organic and inorganic chemicals

    Alcohols . additives . bases . esters . glycerine . resins . hardeners . isocyanates . monomers . oils . phenol . acids . biodiesel . asphalt . bitumen . tar . hotmelt . glues . waxes . etc.


    Celluloseacetate . Nylon 66 . prepolymers . etc.

    Food industry

    Vegetable oils . butter . margarine . flavourings . chocolate . fudge . liquorice . chewing gum . vitamins . syrup . gelatine . etc.

    Pharmaceutical and Cosmetic Products

    Amino acids . lotions . shampoo . vitamins . etc.