The working principle of Roto Twin Screw Pumps is dependent on the rotation of two screw spindles in closed compartment. A pre-defined clearance is maintained between the screw spindles and between screws and the bore of the casing. When the timed screws in twin screw pumps start rotating, the liquid is drawn towards the end of the screw spindles and entrapped between the bore of the pumping compartment as well as the flanks of the screws and is then propelled axially from both the ends towards the centre.
| Feature | Benefit |
|---|---|
| Long and trouble-free service life | Due to absence of metal to metal contact between the pumping elements. Can even run dry for limited period of time |
| No axial thrust | Dual flow of liquid in opposite direction balances axial thrust |
| Higher volumetric efficiency | Due to special double profile of screw flanks |
| High cavitation free suction lift | Due to low NPSH (R) |
| Self-priming and capable of handling entrapped air/vapour/gas | Due to positive displacement action and being inherently self-priming |
| Uniform metered flow | Being a positive displacement pump, head developed is independent of speed and capacity is approximately proportional to speed in twin screw pumps |
| Capable of handling wide variety of Fluids | Lubricating/non-lubricating as well as aggressive liquids can be handled due to choice of different designs and material of construction |
| Safe to operate | Twin screw pumps have in-built relief valve designed to bypass upto 100% capacity |
