Internal Gear Pumps are very versatile and can pump many different types of fluids in a variety of viscosity and temperature ranges. Internal gear pumps use two gears to deliver fluid. The rotor gear is located outside and the smaller idler is nested inside.

When the rotor (outer) gear rotates, it drives the idler (inner) gear. When the idler is out of contact with the rotor gear, liquid is drawn into the pump and flows along the pump casing to the discharge side of the pump, where the gear teeth mesh together and force fluid out of the pump.

Internal gear pumps are ideal for high viscosity fluids. They are also very useful for situations requiring low NPSH. Because there are only two moving parts, maintenance costs are also very low.

Internal gear pumps are not suitable for large solids. Because of their small manufacturing tolerances, large solids can easily damage the pump. They can handle some small suspended solids in abrasive liquids, but it is recommended that this will cause the pump to wear and lose performance.

This is just a short list of applications where internal gear pumps can be used.
Food (corn syrup, oil, nut spread, chocolate)
Dairy products
Personal care products (paste, cream, soap)
Various oils and lubricants
Paint, pigment, ink

Internal gear pumps are one of the common pump types. By talking to us, make sure to find the right pump for your job. Zhejiang Yongling Hydraulic Machinery Co., Ltd. is a professional China manufacturer and supplier of internal gear pumps. Our YLH series internal gear pumps have the advantages of high working pressure, high volumetric efficiency and low pressure pulsation. Our products are widely used in cutting, plastic, forging, engineering, leather, pressure, metallurgy, agriculture, transportation machinery and machine tools, hydraulic stations, automatic production lines and other fields. https://www.china-vanepump.com/product/internal-gear-pumps/