All magnetic drive gear pumps supplied by GATHER Industrie are capable of conveying or dosing non-lubricating liquids. Why? For one thing, this is due to the fact that the pump is flushed internally by means of the conveyed fluid and, moreover, is attributable to the materials used: Optionally, the casing and shaft materials may be stainless steel (material no. 1.4404 or 1.4571), Hastelloy® C-276 (material no. 2.4819) or titanium grade 2 (material no. 3.7035).
These materials warrant high strength and excellent chemical corrosion resistance properties at temperatures of up to +350°C.
The gearwheel and bearing materials must have excellent tribological properties and be highly resistant to chemicals. Particularly well suited for this purpose are the proven materials PTFE, carbon and PEEK in connection with a special nickel alloy incapable of seizing up with the casing materials (non-galling alloy). The materials may be freely combined with each other. This allows material combinations that warrant a maximum service life. PTFE, carbon, metals and all elastomers embracing inter alia EPDM, FKM (Viton®) and FFKM (Kalrez®, Perlast®) are available as sealing materials. This material selection enables nearly all application requirements in chemical process engineering to be satisfied. To find the optimum solution for your specific application please contact our consultation service.
Stainless steel (1.4404 and 1.4571)
Among the normally used austenitic stainless steel grades 1.4404 and 1.4571 are highly resistant to chemicals. 1.4404 lends itself very well to electropolishing. The shafts of grade 1.4571 are kolsterized (hardened).
Hastelloy® C-276 (2.4819)
Nickel-chromium-molybdenum alloy featuring high resistance to pitting in oxidizing and reducing liquids (e.g. strongly oxidizing liquids such as chlorides, fluorides, formic acid, hydrofluoric acid, hydrochloric acid and sulfuric acid). C-276 is the all-round Hastelloy® material offering the best chemical properties in most cases.
Titanium Grade 2 (3.7035)
Especially suited for iron III chloride (40%), glycolic acid and metal-ion-free applications (although plastic pumps are frequently used here, titanium pumps are more robust!).
|PTFE with 25% powdered coal||T|
|PTFE – Comp., (FDA compliant)||S|
|Carbon – antimony impregnated||J|
|Carbon – resin impregnated (FDA compliant)||L|
|PTFE with 25% powdered coal||G|
|PTFE plus mica||F|
|Stainless steel or Hastelloy®||D|