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

Chemical Pumps for safe and relaible metering tasks

Chemical gear pumpCHEM 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

Chemical gear pump standard version

Mini chemical pump for finest metering and dosing tasks

Chemical gear pump with magnetic coupling for critical media

Chemmical gear pump in standard design Mini-Dosierpumpe-fuer-feinste-Dosieraufgaben Magnetgekuppelte Chemiepumpe

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 · 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

0.5 to 1000000 mPas (cP)

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)

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).

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.

Mechanical Seals

Singel mechanical seal for chemical pumps



Single mechanical seal (ED)
Suction pressure: up to 15 bar (abs.) (215 psig)
Viscosity: 0.2 – 5000 mPas
Temerature: max. 300°C (580°F




single mechanical seal with buffer fluid for chemical pumps



Single mechanical seal with buffer fluid (AD)
Suction pressure: vacuum to max. 5 bar (abs. (75 psig)
Viscosity: 0.2 – 1000000 mPas
Temerature: max. 250°C (500°F)




double mechanical seal



Double mechanical seal with buffer fluid (DD)
Suction pressure: vacuum to max 15 bar (abs.) (215 psig)
Viscosity: 0.2 – 10000000 mPas (cP)
Temerature: max 300°C (580°F)




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