Gather Industry’s magnetic drive gear pumps all possess the ability of transferring or dosing non-lubricating fluids. This fact is attributed to having the pump flushed internally by means of the conveyed fluid and the materials used.
The materials that may be used for the casing and shaft include: stainless steel (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 hardened), Hastelloy® C-276 (Nickel-chromium-molybdenum alloy featuring high resistance to pitting in oxidizing and reducing liquids. C-276 is the all-round Hastelloy®material offering the best chemical properties in most cases.), or titanium grade 2 (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!). Among the agreeable qualities of using these materials is that they “warrant high strength and excellent chemical corrosion resistance properties at temperatures of up to +350°C”.
In regard to the gearwheel and bearing materials, they must have excellent tribological properties and be highly resistant to chemicals. Materials provenly suited for such purposes: PTFE, carbon, and PEEK in connection with a special nickel alloy incapable of seizing up with the casing materials (non-galling alloy). Freely combined with each other allows material combinations that warrant a maximum service life.
The best sealing materials commonly used: PTFE, carbon, metals and all elastomers including EPDM, FKM (Viton®) and FFKM (Kalrez®, Perlast®). This selection enables nearly all application requirements in the chemical process engineering to be satisfied. It is important to note, all Gather pumps are designed specifically to serve each specified application and are not intended for non-specified mediums.