These diaphragm pumps are designed for chemical service
The tim CHEM double-diaphragm pumps (photo) are equipped with a plastic housing of either polyethylene (PE) or — for high chemical resistance — polytetrafluoroethylene (PTFE). Instead of the common practice of using threaded sleeves that are screwed into the plastic housing, this company uses a design that connects the highly-resistant plastic components that are in contact with media by means of tie rods. The force exerted by the tie rods is distributed by the large-area reinforcement plates — a measure that significantly minimizes deformation of the plastic caused by temperature variations. The company’s tim FIX system uniformly distributes the forces of the tie rods and minimizes plastic deformation, and thus reduces the possibility of leaks. The pumps have only four sealing points, compared to up to 12 in other designs. This also reduces the possibility of leakage. The 2-in. version (photo) has a maximum flowrate of 600 L/min. — Timmer GmbH, Neuenkirchen, Germany