Triple Screw Pumps

Triple Screw Pumps

Alekton triple-screw pumps are positive displacement, self-priming rotary pumps of advanced design and manufacture, for use in a variety of industrial and marine applications. Typical liquids handled include lubricating oils, fuel oils, hydraulic oils, viscose, molasses, paints and creams.

The pumps can be supplied in a variety of materials of construction and for various mounting arrangements.

Application

Triple Screw Pumps are designed for handling clear viscous liquids. The liquids to be pumped must neither contain abrasive substances nor chemically attack the pump materials.

Design

The pumping elements comprise of a power-screw and two idler screws, running in a close fitting insert. Mathematically calculated profiles of the screws ensure the formation of chambers of constant volume. When the screws rotate, they move at uniform velocity axially and transfer the entrapped liquid without crushing, turbulence or pulsation.

The idler screws serve to maintain the closed chambers which pump the liquid. Because they are suitably proportioned, they are driven hydraulically by the pumped liquid, eliminating the need for timing gears. Axial hydraulic thrust is balanced by balancing drums on each screw thus relieving the bearing of thrust loads. The balancing drums of the idler screws as well as the power screw run in replaceable bushes.

The shaft seal chamber is connected internally to the inlet and the seal is therefore always subjected to inlet pressure only. With high suction lifts, a pressure control valve is provided so that the pressure in the seal chamber is maintained above atmospheric to prevent ingress of air and dry-running of the seal.

Triple Screw Pumps (Series A)

Triple Screw Pumps (Series A)

The insert, screws and balancing bushes, together with bearing and seals form a cartridge that is located inside a casing. The cartridge includes all the wearing parts and can be removed for inspection or replacement as a unit. The casing is provided with in-line flanged inlet and outlet connections

Normal Operating Range

Parameters

Viscosity

Flow rate

Outlet Pressure

Inlet pressure

Liquid temperature

Min

0.8 cst

5 L/min

0 barg

-1 barg

-30 °C

Max

100000 cst

10000 L/min

16 barg

6 barg

130 °C

Triple Screw Pumps (Series C)

Triple Screw Pumps (Series A)

The screws are located inside the insert which has an integral outlet connection. An end-cover attached to the insert is provided with the inlet connection.

Normal Operating Range

Parameters

Viscosity

Flow rate

Outlet Pressure

Inlet pressure

Liquid temperature

Min

0.8 cst

5 L/min

0 barg

-1 barg

-30 °C

Max

5000 cst

1300 L/min

16 barg

6 barg

130 °C

Triple Screw Pumps (Series D)

Triple Screw Pumps (Series A)

The insert, screws and balancing bushes, together with bearing and seals form a cartridge that is located inside a casing. The cartridge includes all the wearing parts and can be removed for inspection or replacement as a unit. The casing is provided with in-line flanged inlet and outlet connections

Normal Operating Range

Parameters

Viscosity

Flow rate

Outlet Pressure

Inlet pressure

Liquid temperature

Min

0.8 cst

5 L/min

0 barg

-1 barg

-30 °C

Max

100000 cst

10000 L / min

64 barg

6 barg

130 °C