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  • Mechanical
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  • Category Tags
Product Type
Pumps > Three-screw
Related Industries
General Industry
Pressure Differential
Maximum: 280bar-d
Fluid Temperature Range
Maximum: 80°C
Flow Capacity
Construction Features
Categegory Tags
Design Types
base plate

Product Description

Three-Screw pump up to 280 bar

Product Features

TUSHACO Three Screw pumps employ three screw elements - one power screw and two idler screws running in three precision bores in the housing or liner. The screws are so profiled that they form a liquid tight seal between the threads. As the screws rotate, pockets/ cavities are formed where liquid gets trapped and conveyed from one end of the infinite stroke. This results in smooth, pulsation free flow with extremely low noise and vibration levels, almost impossible to be achieved by any other design of positive displacement or other types.

The power rotor does not drive the idlers as commonly believed. The hydraulic forces acting on screw flanks turn the idlers torquelessly thus reduce the friction. The idlers simply roll over the root diameter of power screw to reduce the unit pressure, centralize the power rotor and absorb the radial loads. A balance piston integrally machined on power rotor balances the axial thrusts.

While in operation, the screws are in hydrodynamic balance on film lubrication and do not require any additional bearings. The one ball bearing often used is only for axial positioning of rotor and safer operation of mechanical seals. Small rotor dimensions enable the pump to be operated at high speeds directly coupled 3000 or 3600 RPM motors or other prime movers. Such unique design and features have demonstrated excellent reliability with pumps in continuous operation non-stop for decades together without replacement of any components or maintenance on clean fluids.

Typical Pumped Media
Fuel Oil, Lube Oil, Mineral Oil, Vegetable Oil, Crude Oil, Glycol, Bitumen, Resins, Paint, Viscose, Pulp, Greases, Molaffes, etc.

Typical Applications
Lubrication, Hydraulic jacking, Firing, Transfer, Circulation

Typical Industries
Power generation, Marine, Navy, Oil & Gas, General Industrial, Machine Tool, Steel, Cement, Chemical, Rayon

Maximum performance data

upto 2500 lpm

Diff. Pressure:

upto 280 bar

Operating parameters

From 3 cSt to 50,000 cSt

Fluid Temperature:

upto 80 deg. centigrade


upto 11000 rpm.

Material Of Construction
Casing options:Cast Iron / Cast Steel / Fabricated / SG Iron
Casing Insert Options:Cast Iron / Aluminium / No casing insert


Carbon Steel / Alloy Steel

Sealing Options:

Gland packing / Mechanical seal

Construction Features
Bearing options:Internal / External ball bearing / Bush bearing
Jacketing options:

Front cover / gland cover / casing / foot

Mounting options:

Horizontal Foot / Horizontal Flange / Vertical

Pedestal / Vertical Tank
Relief valve options:

Built-in / Line mounted


Relief valves, base frame, coupling, coupling guard, companion flanges, pressure gauges, electric motor, variable speed drives, etc.
Pump mounted on a base plate with above accessories as a ready to install system can be supplied

Salient Features
High reliability
Long service life
Negligible maintenance
High efficiency
Self priming
Smooth pulsation free flow
Low noise and vibrations
High speed capability
Insensitive to viscosities
High pressure capability
Axial flow - no churning, chewing or shearing
Excellent suction capability
Hydraulic balancing of forces eliminates need for any bearings


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