jbj Techniques Ltd; an excellence in engineering

Screw Pumps

These screw pumps are volumetric self-priming pumps suited to handle oils and liquids with a minimum lubricating quality. The design simplicity makes these screw pumps intrinsically reliable and efficient.

epicycloidal screw pumps
Three epicycloidal screws rotate inside a replaceable casing with close tolerances, so forming sealed chambers and provoking the axial displacement of the fluid.

The idler spindles rotate without contact with the driving spindle because of the fluid itself, therefore being free from radial forces.

The accurate hydraulic balance and the special profile of the screw thread guarantee a continuous flow with minimum pulsations and turbulance, resulting in extremely low noise levels even at high rotational speed.

The screws epicycloidal profiling is developed through a complex computerised calculation which not only perfectly defines their shape, but also controls the production with continuous monitoring of machinery process, consequently assuring a high degree of repeatable quality.

The high quality level of these screw pumps is guaranteed by a final testing on 100% of the manufactured products.

1) Screw Pump application and characteristics

» Screw pump flow rates up to 5.400 lpm, larger flow rates are available upon request.
» Pressure up to 200 bar, higher pressure versions are available upon request.
» Suitable for lube oils (mineral and synthetic – even at high viscosity > 100.000 cSt, HFC fluids, water based emulsions, cutting oils, aeronautic and dielectrical fluids, LFO and HFO, silicon fluids).
» Execution conform to API 676 (latest edition).
» ATEX approval, survey by naval inspection bodies.
» Built in relief valve, optional.

2) Screw pump applications

Lubrication Applications

» Lubricating system for: speed variators, turbines, gearboxes, papermill machines, hot forming machines.
» Lubrication system for the petrochemical, iron and steel, and mining industries as well as shipbuilding.

Driving Applications

» Machine tools, bed traversing.
» Hydraulic presses.
» Hydraulic units for elevators.
» Hydraulic supporting.
» Rolling mills.

» Test benches.
» Sheet metal machines.
» Plastic molding machines.
» Medical Units.

Recirculation and Filtering Applications

» Cooling Lubrication: deep hole drilling, pipe boring, chip conveyors.
» Filtering: mobile filtering systems, off-line filtering systems for process machines and machine tools, hydrualic presses, textile machines, grinding machines.
» Heat Exchanging: injectors heating for plastic molding machines, heat exchangers.
» Flushing and Boosting: piping systems washing, hydraulic systems flushing, boost circuits.

Fluids to be pumped

» Hydraulic oils.
» Lubricating oils.
» Diathermic oils.

» Oil-in-water emulsions (min. oil percentage 5%).
» Light and heavy fuel oils.
» Phosphoric esters.

3) Characteristics

» Compatible with a wide range of viscosities from 1 to 12,000 cSt and above.
» Efficiently working also at very low temperatures (-20°C).
» High self-priming capacity.
» High rotation rates = minimizing the size and cost of the pump.
» Steady flow rate = maximum efficiency in heat exchange applications.
» Special design for systems with entrained air in the lubricant = minimizing the vibrations and noise caused by air.
» Minimum sensitivity to particle pollution = longest life of the pump and circuit.
» Continuous operating pressures up to 130 bar, peak 200 bar.
» Pulsation-free = maximum efficiency of filtering applications.
» Extremely quiet.

4) Product Options

Screw pumps: standard according to API 676, for mineral and lubricating oils also fluids with low lubricating properties (water + oil, HFC, LFO, HFO). Flows up to 5,000 litres per minute and pressure up to 130 bar (200 bar peak).

SAE counterflanges.

Motor pump sets: close coupled, AC or DC electric motors.

Pre-assembled systems: with bell-housing and coupling arrangements.

Skid mounted pumps: with or without motor but suitable for horizontal or vertical mounting.

High efficiency Air/Oil Heat Exchangers: up to 14,000 kCal/h (16kW).

Off-line filtration systems (filtration trolley) and complete stand alone systems, also for machine tools).

Relief valves: Flow rate from 50 to 1,200 litres per minute and pressure up to 40 bar.

ATEX approval for use in explosive atmospheres: ATEX Zone 0 & 1 (for some models).
Specification of INDUSTRIAL screw pumps found in this on-line » catalogue « link
Specification of MARINE screw pumps found in this on-line » catalogue « link
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