Self-priming Centrifugal Pump The series of DESMI MODULAR S pumps represents one of the most distinctive developments in selfpriming pumps. Based on many years of experience in the production of self-priming pumps we supply a pump series that meets the future demands for economical and reliable pumps. The individual design, compact with a clear-cut cylindrical form, together with the practical advantages such as easy assembling and MODULAR construction of all components ensure a long and positive operation. This priming principle (described on the back of this page) means that MODULAR S can pump a mixture of air and liquid and thus evacuate air from the suction pipe. Thus, priming can be avoided and a foot valve is not necessary. Various Combinations of Assembling The pumps of the MODULAR S series can be supplied as free shaft end, mounted on a base plate with petrol or diesel engine, hydraulic or electric motor or in a close-coupled design with electric motor. They can also be fitted with a manual friction clutch and V-belt pulley and with step-up bevel gear ratio 1:2. MODULAR S/02 self-priming centrifugal pumps in close-coupled design. This version of the well-known MODULAR S pump meets the requirements for a compact and reliable pump and does not need special alignment. The pump is connected to the electric motor via a rigid coupling and can be mounted with any standard electric motor. The MODULAR S pump is constructed of standard components and this principle has been further emphasized in the monobloc version. For optimum flexibility the pump is designed in such a way that only the coupling and the motor flange have to be changed in order to fit the selected electric motor. The monobloc version is equipped with a separate bearing housing with only one bearing, and the rigid coupling is mounted on the short shaft. Applications for MODULAR S and S/02 • Draining building excavations • Emptying ponds, drains, and swimming pools • Water extraction for irrigation and watering • General service pumps • Fuel handling • Condensate extraction pumps • Petrol • Diesel For more information on Industry solutions, please visit www.desmi.com MARINE & OFFSHORE DEFENCE & FUEL

Priming principle The priming is based on the diffuser principle, which means that the priming ability is independent of valves and other mechanical elements as it is the flow of liquid that carries the air In addition, the diffuser principle has the effect that MODULAR S can pump slightly polluted as well as air-mixed liquids. Before first starting the pump, the casing must be filled with liquid. When the pump has been started, the liquid begins to circulate in the pump casing and the impellar channels. Thus, an air-mixed liquid is produced in the outer third of the impeller A and a vacuum is...