Diaphragm metering pumps do not leak and are therefore suitable for fluids that are very aggressive and toxic

Depending on the type of pump, the diaphragm allows pressures up to 16 bars. Diaphragm metering pumps are fitted as standard with a separation chamber. The formation of a crack due to wear of the diaphragm prevents fluid from flooding the components of the system or the pump itself. The fluid is controlled and flows through a down pipe into the leakage manifold. The membranes are coated with PTFE. The dosing amount can be doubled with two dosing heads. The larger motorized diaphragm metering pump (type GMR) is equipped with a hydraulically coupled double diaphragm system.

Piston metering pumps are particularly precise and independent of back pressure. The quantity is adjusted in proportion to the stroke length, their reproducibility allows dosages for extremely small quantities. Pumps with two or more pistons allow exact mixtures or at constant ratio between different fluids to be dosed. Using externally controlled drive motors, the total quantity can be varied from 5% to 100% at a constant ratio.