Linear pumps are used for pumping water and other liquids in the corrosion resistance of materials used for construction of the pump and as the name suggests, are characterized by the body in the system in-line. Are most often used in central heating, hot water, air conditioning, water and other industrial and technological installations. These pumps are also offered with the motor with integrated frequency converter; in this version are used among others. to maintain a constant pressure or differential pressure in systems.