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.
Distinctive Design Features and Benefits
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
