Gear Pumps are one of the most popular and widely used positive displacement pumps. They are used across a wide range of industries and application and although designs differ there are three key categories.
Internal Gear Pumps
There are several types of Internal Gear Pumps, but they are all fundamentally the same in terms of design. An internal gear pump operates by drawing media into the pump Inlet between the rotor and the idler. This operates with a ‘gear within a gear’ principle. An internal Gear Pump is suitable for moderate pressure applications, and can perform at high temperatures. Internal Gear Pumps are relatively simple in design making them easier to repair. They are popular for very viscous fluids and are used in applications where the media is chemicals, bitumen, resins.
External Gear Pumps
External Gear Pumps are the oldest and simplest of the designs. They tend to be less expensive and easier to operate than internal gear pumps and can be manufactured in small sizes making them useful for sampling and metering. They are suitable for high pressure applications, working at low to medium temperatures. They are most popular with lubrication pumps within machine tools and often used for applications involving polymers, fuels and chemical additives.
Gerotor Pumps are similar to Internal Gear Pumps in design but employ a different mechanical arrangement, essentially they are an Internal Gear Pump without the crescent. They are very simple in design with only two moving parts meaning they can operate well in either direction and will produce a constant and even discharge regardless of pressure. They are not suitable for solids, but are popular for OEM application such as lubrication and circulation.
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