Screw Pump


Its capacity is 10 l/min to 1200 l/min which can be supplied most of customers' demand.

Internal screw pump has installed for elevator purpose because its noise is less than 60db.


Donam Engineering has added silencer into screw pump for lesser noise before supplying to customers.

Pumps are three screws pumps for industrial use at low medium pressure (80 bar). Pumps represent a reliable and low noise-component for applications where long life and low cost are required, as in home lifts and elevators. Pump is a priming pump assembled into a pump body. The three screws rotate inside the pump body and the design of the screws avoids any axial load. The functional pressure develops some tolerance between the balancing piston of the main screw and the surrounding body. This creates a balancing hydrodynamic force on the screws and at the same time lubricates and cools down the sealing parts. The torque needed to move the lateral screws is transmitted hydraulically by the pumped fluid. This means that the screws rotate with no possibility of wearing. The high quality of screws manufacturing ensures a very low level of acoustic emissions and pulsation. The geometric design of the three screws creates sealing chambers. During the rotation of the screws, the main one creates a sort of cavity that holds the fluid and drives it with an axial direction from the inlet to the outlet port. Motors can be submersible or dry motors. Immersion type motors are three-phase A.C. asynchronous motors directly connected to the pump, or with flange and clutch. Enclosure IP 00, form of construction B15, insulation class F. The oil temperature should not exceed 70℃.