Internal Gear Pump - High-viscosity Operation, Low-speed Design Up To 1,150 Rpm, Abrasive Liquid Handling, External Gear Driven

These Internal Gear Pumps have an external gear that is generally used to drive the internal gear. The internal gear, which is smaller than the external gear rotates on a pin and operates inside the external gear. The gear creates voids as they come out of the mesh and liquid flows into the pumps. As the gears come back into mesh, volumes are reduced and liquid is forced out the discharge port. Liquid can enter the expanding cavities through the external teeth or recessed areas ion the head, alongside the teeth. These Internal Gear Pumps heads prevents liquids from flowing the suction port from the discharge port.

The external gear is driven by a shaft supported by bearings. The internal gear contains a bearing rotating on a stationary pin in the pumped liquied. Depending on shaft sealing arrangements, the external shaft support bearings may run in pumped liquid. This is an important consideration when handling an abrasive liquid and can wear out a support bearing.

The Speed of the internal gear pumps is considered relatively slow compared to centrifugal types. Speeds up to 1,150 rpm are considered common. Because of their ability to operate at low speeds, internal gear pumps are well suited fro high - viscosity applications and where suction conditions call for a pump with minimal inlet pressure requirements.