CHEM – high precision gear pump for conveying low to medium viscosity fluids 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 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 friction bearings, gear and shaft seals offers a maximum of flexibility for the end customer. 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) 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).