German LOWARA pump LOWARA model LOWARA price

The most basic form of the LOWARA pump consists of two gears of identical size meshing and rotating within a closely fitted housing. The interior of this housing resembles the shape of the number "8", with the two gears installed inside. The outer diameters and sides of the gears fit tightly against the housing. Material from the extruder enters between the two gears at the suction inlet, fills this space, moves along the housing as the teeth rotate, and is finally discharged when the teeth mesh.

LOWARA pump working principle

The concept of a gear pump is simple. Its most basic form consists of two gears of identical size meshing and rotating within a closely fitted housing. The interior of this housing resembles the shape of the number "8", with the two gears installed inside. The outer diameters and sides of the gears fit tightly against the housing. Material from the extruder enters between the two gears at the suction inlet, fills this space, moves along the housing as the teeth rotate, and is finally discharged when the teeth mesh. A gear pump is also known as a positive displacement device. Like a piston in a cylinder, when one tooth enters the fluid space of another, the incompressibility of the liquid prevents the liquid and the tooth from occupying the same space simultaneously, mechanically forcing the liquid out. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, providing a constant discharge volume at the pump outlet. The discharged volume per revolution is constant. As the drive shaft rotates continuously, the pump discharges fluid without interruption. The pump flow rate is directly related to the pump speed. In practice, there is a small amount of fluid loss within the pump because this fluid is used to lubricate the bearings and the sides of the gears. Since a gap-free fit in the pump body is impossible, the fluid cannot be discharged from the outlet 100%, making some fluid loss inevitable. Consequently, the pump's operating efficiency cannot reach 100%. However, the pump can still operate well, achieving efficiencies of 93% to 98% for most extruded materials. This pump is not significantly affected by changes in fluid viscosity or density during the process. If a damper, such as a filter screen or restrictor, is placed on the discharge side, the pump will push the fluid through them. If the damper changes during operation—for example, if the filter becomes dirty or clogged, or if the back pressure of the restrictor increases—the pump will maintain a constant flow until the mechanical limit of the weakest component in the system is reached (a torque limiter is usually installed). The pump speed is actually limited, primarily depending on the process fluid. If oil is being conveyed, the pump can rotate at high speeds, but this limit increases significantly when the fluid is a high-viscosity polymer melt. It is crucial to fill the space between the two teeth on the suction side with high-viscosity fluid; if this space is not fully filled, the pump cannot discharge an accurate flow rate. Therefore, the PV value (pressure × flow velocity) is another limiting factor and a process variable. Due to these limitations, gear pump manufacturers offer a range of products with different specifications and displacements (volume discharged per revolution). These pumps are matched to specific application processes to optimize system capacity and cost.

LOWARA pump usage precautions

Gear pumps are suitable for various industries and handle a wide range of media. These gear pumps offer advantages such as robust construction, easy installation, simple disassembly, straightforward maintenance, uniform and continuous flow, minimal wear, and long service life. 1) During gear pump operation, frequent greasing is required. Since lubricating grease evaporates relatively easily, attention must be paid to replenishment and replacement, and cleanliness at the bearings must be maintained. 2) When using or after using the electric oil pump, store it in a dry, non-corrosive, and clean environment. 3) Frequently inspect and maintain the gear pump during use. Check the electric oil drum, including the power cord, internal wiring, plug, and switch, to ensure they function normally. Inspect bearing components for any damage. 4) Preserve every component of the gear pump. During disassembly and inspection, keep all parts clean and stored properly.

LOWARA pump maintenance

When using gear pumps, it is unavoidable to encounter wear on the gear pump. Therefore, many problems will arise. Thus, one must learn the most common maintenance techniques for gear pumps. This enables accurate diagnosis when issues occur. Routine maintenance procedures are as follows: 1) Maintenance of the working surface: If the wear on the pump cover's working surface is minimal, you can manually remove the wear marks by lapping, specifically by placing a small amount of valve grinding compound on a flat platform or thick glass plate, then placing the pump cover on top for lapping, until the wear marks are removed, and the working surface is flat. If the wear depth on the working surface of the pump cover exceeds zero point one millimeter, maintenance should involve turning followed by lapping. 2) Maintenance of the drive shaft bushing bore: The repair method for wear on the drive shaft bushing bore in the pump cover is the same as that for the housing's drive shaft bushing bore. Repair of the pump housing bore: After wear occurs in the pump housing bore, it is typically repaired using a sleeve insertion method, which involves boring out the inner cavity and fitting a cast iron or steel sleeve. After inserting the sleeve, bore the inner cavity to the required dimensions, and grind down the sleeve protruding from the end face, ensuring it is flush with the pump housing mating surface. 3) Maintenance of the valve seat: Pressure-limiting valves come in two types: ball valves and plunger valves. After the ball valve seat wears, place a steel ball on the valve seat, then gently tap the steel ball with a metal rod, until the ball valve seats tightly against the valve seat. If the valve seat is severely worn, ream to remove the wear marks, and then use the above method to achieve a tight seal. After the plunger-type valve seat is worn, a small amount of valve grinding compound can be added for lapping, lapping until a tight seal is achieved. The above describes some of the most basic maintenance procedures for components of gear pumps. During application, other different problems may also be encountered, and these different problems must be carefully investigated to identify their causes.

Weidou Intelligent Technology specializes in selling German LOWARA centrifugal pumps, LOWARA gear pumps, LOWARA diaphragm pumps, LOWARA centrifugal pumps, LOWARA piston pumps, LOWARA vacuum pumps, LOWARA screw pumps, LOWARA submersible pumps, LOWARA peristaltic pumps, LOWARA lubrication pumps, LOWARA vane pumps, LOWARA metering pumps, LOWARA hand pumps, LOWARA barrel pumps, LOWARA cam pumps, LOWARA booster pumps, LOWARA liquid pumps, and LOWARA air pumps. All products are original imports from Germany. Customers are welcome to inquire and order.