POSITIVE DISPLACEMENT PUMPS

Positive Displacement Pumps.

Positive displacement pumps are used for transferring liquids of high viscosity. The types of positive displacement pumps available are rotary lobe, progressive cavity pump, rotary gear pump, piston pump, diaphragm pump screw pump, gear pump, vane pump and peristaltic pump. These pumps have an expanding cavity on the inlet side causing a reduction in pressure and a decreasing cavity on the outlet to push out the entrained liquid and thus create pressure. These pumps have a constant head and a discharge proportional to rotation. Because of this positive displacement pumps must not operate against locked head and a relief valve is recommended.

Johnson internal gear pumps.

Johnson gear pumps are used in industries usually for transporting high viscosity fluids like bitumen, chocolates, diesel fuel. These pumps are made with a sturdy design thus offering high reliability and long life. Johnson Indonesia gear pump is based on an internal idler gear rotating inside a larger rotor. The pumps are capable of high pressure and are self-priming. Shaft seal options include single and double mechanical seal, packed gland and cartridge seals. Single or double relief valves are available built in. The G and H series internal gear pumps are for high viscosity fluids and the L series is for low viscosity fluids. Magnetically driven gear pumps are also available on request for pumping hazardous fluids.-on. Connections from 32 to 150 mm.

Johnson pump filters.

Johnson pump filters are important for smooth operations of positive displacement pumps. These remove unwanted debri which can damage the rotors. Johnson Indonesia supplies Top filters in two ranges, four material options and eleven separate sizes with a mesh size down to 10 microns. The filters are available in single or dual filter models. The dual filter option allows one basket to be cleaned when switched off line.

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Frequently Asked Questions

  • What is the advantage of using lobe pumps over progressive cavity pumps?

     Progressive cavity pumps usually have wear on the rubber stator especially if the fluid pumped is abrasive. Lobe pumps do not touch the stator when running and the material can be harderned for abrasive materials.

  • What is the advantage of gear pumps over lobe pumps?

    Gear pumps are usually used for pumping high viscosity fluids where there is no problems with shear e.g. in pumping bitumen. The gear pumps run at higher speeds and are smaller and thus cheaper.

  • When should the single cavity lobe pumps be used?

    Single cavity lobe pumps are used where there are very high viscosity fluids which contain abrasives e.g. sugar molasses.

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