ATOS gear pump PFG-218 from Italy is in stock.

Brand

ATOS/Italian Atos

ATOS Hydraulic Pumps, ATOS Piston Pumps, ATOS Gear Pumps

ATOS Gear Pump Structure and Principle:

The structure of the ATOS gear pump is very simple. Its most basic form consists of two identical gears meshing and rotating within a tightly fitted housing. The inside of this housing is similar to a figure "8," with the two gears housed within it. The outer diameter and sides of the gears fit tightly to the housing. Material from the extruder enters between the two gears through the inlet and fills this space. As the gears rotate, they move along the housing and are finally discharged when the two gears mesh. Technically, a gear pump is also called a positive displacement device, much like a piston in a cylinder. When one gear enters the fluid space of another gear, the liquid is mechanically squeezed out. Because liquid is incompressible, the liquid and the gears cannot occupy the same space at the same time, thus the liquid is expelled. This phenomenon occurs continuously due to the constant meshing of the teeth, thus providing a continuous discharge volume at the pump outlet; the discharge volume is the same for each pump revolution. As the drive shaft rotates continuously, the pump continuously discharges fluid. The pump's flow rate is directly related to its rotational speed. In reality, there is a small amount of fluid loss within the pump, preventing it from reaching 100% efficiency. This is because the fluid is used to lubricate the bearings and gears, and the pump body cannot be perfectly flush, so a small amount of fluid loss is inevitable. However, the pump can still operate well, achieving 93%–98% efficiency for most extruded materials. This type of pump is not significantly affected by fluids whose viscosity or density varies during the process. If a damper is present, such as a filter or restrictor on the discharge side, the pump will force the fluid through it. If the damper changes during operation—that is, if the filter becomes dirty or clogged, or the back pressure of the limiter increases—the pump will still maintain a constant flow rate until the mechanical limit of the weakest component in the unit is reached (usually equipped with a torque limiter).

ATOS gear pumps have a limited actual speed, which depends primarily on the process fluid. If the fluid being pumped is oil, the pump can rotate at very high speeds, but this limitation is significantly reduced when the fluid is a high-viscosity polymer melt. Driving high-viscosity fluids into the suction gear pump.

Gear pumps.

The two-tooth space on the inlet side is crucial. If this space is not filled, the pump cannot deliver the accurate flow rate. Therefore, the PV value (pressure × 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 (the amount discharged per revolution). These pumps are matched to specific application processes to achieve the desired system capacity and price.

The gears and shaft of the PEP-II pump are integrated and hardened throughout for a longer service life. The "D" type bearing incorporates a forced lubrication mechanism, allowing polymer to pass through the bearing surface and return to the pump inlet side, ensuring effective lubrication of the rotating shaft. This feature reduces the possibility of polymer retention and degradation. The precision-machined pump body allows for a precise fit between the "D" type bearing and the gear shaft, ensuring the gear shaft is not misaligned and preventing gear wear. The Parkool seal structure, together with the PTFE lip seal, forms a water-cooled seal. This seal does not actually contact the shaft surface; its sealing principle is to cool the polymer to a semi-molten state to form a self-sealing effect. A Rheoseal seal can also be used, which has reverse spiral grooves machined on the inner surface of the shaft seal, allowing the polymer to be back-pressurized back to the inlet. For ease of installation, the manufacturer has designed an annular bolt mounting surface to accommodate flange mountings with other equipment, making the manufacture of cylindrical flanges easier. The PEP-II gear pump comes with heating elements matched to the pump specifications, available as an option for users, ensuring rapid heating and heat control. Unlike internal heating methods within the pump body, damage to these elements is limited to a single plate and is not related to the entire pump.

The ATOS gear pump is driven by an independent motor, effectively blocking upstream pressure pulsations and flow fluctuations. Pressure pulsations at the gear pump outlet can be controlled to within 1%. Using a gear pump in an extrusion production line can increase flow rate, reduce material shearing and residence time within the extruder, lower extrusion temperature and pressure pulsations, thereby improving productivity and product quality.

The ATOS gear pump is a type of positive displacement pump, consisting of two gears, a pump body, and front and rear covers forming two enclosed spaces. When the gears rotate, the volume of the space on the disengaged side increases, creating a vacuum that draws in liquid. Conversely, the volume of the space on the meshing side decreases, forcing the liquid into the pipeline. The suction and discharge chambers are separated by the meshing line of the two gears. The pressure at the gear pump outlet depends entirely on the resistance at the pump outlet.

ATOS gear pump April* spot:

PFG-135

PFG-142

PFG-160

PFG-174

PFG-187

PFG-199

PFG-211

PFG-214

PFG-216

PFG-218

PFG-221

PFG-327

PFG-340

PFG-354

PFG-210

PFG-114/D

PFG-120/D

PFG-128/D

PFG-142/D

PFG-160/D

PFG-174/D

PFG-187/D

PFG-199/D

PFG-210/D

PFG-211/D

------------------------------------------------------------------------------------------------ The company mainly deals with European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS

British brands: Norgren

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi

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