Pumps of the ZHEN (PE) type and pump units based on them of the AJHEN (APE) type are manufactured in accordance with the technical conditions of TU U29.1-31652112-002:2005, TU U29.1-31652112-003:2005, TU U29.1-34933255-018:2008, TU U29.1‑3493325528 -021:2009, TU U29.1-34933255-019:2009 and are intended for supplying water to stationary steam boilers of thermal power units of thermal power plants, providing feed water with a temperature of up to 165 °C to boiler rooms and steam generator units.