KYB51100+KFR32L Komatsu Gear Pump GD605A GD655A WA100 WA100SS

The gear pump is a PD (Positive displacement) pump. It helps to develop a flow by carrying the fluid between repeatedly enclosing interlocking gears or cogs, transferring it automatically using a cyclical pumping action. So, the hydraulic gear pumps provide a smooth pulseless fluid flow whose rate depends on its gears’ rotational speed.

The gear pump has a few moving parts and is very simple and compact. Its pressure power cannot be matched with reciprocating pumps or the rates of flow of the centrifugal pumps. Yet it provides higher throughputs and pressures than lobe pumps or vanes. The gear pump is specifically suitable for fluids of high viscosity and pumping oils.

From the two types of gear pumps, the external design has the ability to sustain high flow rates and pressures (more than 3000psi) due to its closer tolerances and stronger shaft support. Internal design provides better suction. It is suitable for fluids of high viscosity but it provides an operating range of 1cp to more than 1,000,000cp. As output depends on the rotational speed, the gear pump is mostly used for blending and metering operations. The gear pump can also be engineered for handling aggressive liquids. Whereas it is generally made from stainless steel or cast iron, new composites and alloys let the pump handle corrosive fluids like sodium hypochlorite, sulphuric acid, sodium hydroxide, and ferric chloride.

The external design can be used in lifting machinery, hydraulic power, plant equipment, and vehicles. When the gear pump is driven in reverse, by using the oil which can be pumped from anywhere in the system (generally through a tandem pump within an engine), creates the hydraulic motor. It can be beneficial for providing power in those fields where the electrical system is costly, inconvenient, or bulky. For example, a tractor depends on an external design engine-driven gear pump to power its services.