Product Introduction
The Series Gear Oil Pump is a robust, versatile, and highly economical positive displacement pump. Based on the classic external gear design, it is one of the most widely used pumps for transferring a broad range of oils, fuels, and other viscous liquids that have lubricating properties. Renowned for its simple construction, reliability, and ease of maintenance, the pump is an essential workhorse in countless applications, from fuel oil transfer and machine lubrication to general industrial processing.
Design Philosophy & Construction
The pump operates on the simple and effective external gear principle, which uses only two moving parts to generate flow.
- Twin Gear Mechanism: The pump features two identical, intermeshing gears—a drive gear and a driven (idler) gear—housed within a close-tolerance casing. The drive gear is connected to the motor shaft, and as it rotates, it causes the driven gear to rotate in the opposite direction.
- Pumping Action:
- Suction: As the gear teeth un-mesh on the suction side, they create an expanding volume and a partial vacuum, drawing fluid into the pump.
- Transfer: The fluid becomes trapped in the spaces between the gear teeth and the pump casing. It is then carried around the outside of each gear toward the discharge side. The fluid does not travel between the meshing gears.
- Discharge: When the gear teeth mesh back together on the discharge side, the volume is reduced, and the trapped fluid is squeezed out through the discharge port under pressure.
- Durable Build: The pump is typically constructed with a rugged cast iron casing and hardened steel gears for general oil applications. Stainless steel versions are also available for more corrosive fluids or food-grade applications. The gear shafts are supported by internal bushings that are lubricated by the pumped fluid itself.
- Integrated Relief Valve (Optional): Many models are equipped with a built-in safety relief valve. This valve automatically bypasses flow from the discharge back to the suction side if the system pressure exceeds a set limit, protecting both the pump and the downstream system from damage.
Key Features & Benefits
- Simple and Robust: With only two moving parts, the design is incredibly reliable, easy to understand, and simple to maintain, leading to a long service life and minimal downtime.
- Highly Cost-Effective: The gear pump offers excellent performance and reliability at a very economical price point, providing exceptional value.
- Handles a Wide Viscosity Range: It is highly efficient at pumping both thin liquids like diesel fuel and very thick, viscous fluids like molasses and heavy gear oils.
- Steady and Predictable Flow: As a positive displacement pump, it delivers a consistent, predictable flow rate that is directly proportional to its operating speed.
- Good Self-Priming Capability: The design allows the pump to create a strong suction lift, enabling it to prime itself from tanks or drums located below the pump level.
- Compact and Versatile: The pump’s compact footprint allows for easy installation in tight spaces, and it can be driven by a variety of motors.
Common Applications
The pump is a versatile solution for nearly any task involving the transfer of clean, lubricating liquids.
- Fuel Oil Transfer: Loading, unloading, and transferring diesel, kerosene, and heavy fuel oils for boilers, generators, and day tanks.
- Machinery Lubrication: Circulating and supplying lubricating oils for gearboxes, bearings, and industrial machinery.
- Hydraulic Systems: Used as charge pumps and transfer pumps in hydraulic power packs and systems.
- Oil Depots & Terminals: General transfer duties for loading and unloading trucks, rail cars, and barrels.
- Industrial Processing: Pumping viscous fluids such as resins, polymers, adhesives, soaps, and food products like edible oils and molasses (with appropriate materials).
