Our MHG external gear pumps are designed to handle clean low – high viscosity lubricating fluids. Being positive displacement our helical gear pumps are suitable for high pressure applications up to 15 bar depending on the model configuration selected and fluid being pumped.
Design
A Helical Gear Pump is a type of External Gear Pump used for the transfer of viscous fluids at low speed. Two sets of interlocking gears are offset within the pump head, with 2 gears located at the front of the pump head, and 2 to the rear to ensure the rotary forces remain balanced.
Gears are mounted above each other, with one gear driven by the motor, while the other is driven by the rotating gear. Due to their simplistic design, and internal construction comprising of only two rotating parts combined with tight clearances is one of the secrets of our high efficiency.
Liquid enters the spaces between teeth before travelling around the outer casing towards the discharge. Fluid does not flow between meshing teeth.
This design of pump enables pressures of up to 20 bar to be produced, with less noise generated than an internal gear pump due to the internal gear design and working movement.
Units can be supplied with an external bypass valve for unit and pipework protection and external heating or cooling jacket for maintaining of product temperature upon request. This range is available with a variety of seal types such as mechanical seal, cartridge seal, packing seal and lip seals.
Uses
As there is almost zero slip during operation, these pumps are commonly used for metering applications where an accurate non pulsating metered flow across a range of pressures is required. Our pump’s high efficiency means their energy consumption is minimal making them a great choice for continuous dosing or transfer operations.
Some of the most common fluids used in external gear pump applications include fuels, oils, bitumen, grease, resins and adhesives. As models are available in a wide variety of materials, sizes, sealing options, and with a max temperature handling of 350°C ensures units can be utilized for a wide range of applications, for non-abrasive, lubricating fluids where a non-pulsating flow is necessary.
