ATOS gear pump PFGXF-128/D in stock

Brand

ATOS/Italian Atos

ATOS Piston Pumps, ATOS Gear Pumps, ATOS Axial Piston Pumps, ATOS Vane Pumps, ATOS Hydraulic Cylinders, ATOS Relief Valves, ATOS Proportional Valves

ATOS Gear Pump Structure and Principle:

The structure of an ATOS gear pump is very simple. Its most basic form consists of two gears of the same size meshing and rotating within a tightly fitted housing. The inside of this housing is similar to a figure-eight shape, 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, the material moves along the housing and is 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 system is reached (usually equipped with a torque limiter).

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 discharge port of the gear pump depends on the magnitude of the resistance at the pump outlet. A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport or pressurize liquids. The structure of an external meshing double gear pump: A pair of meshing gears and the pump cylinder separate the suction and discharge chambers. As the gears rotate, the inter-tooth volume at the point where the gear teeth disengage in the suction chamber gradually increases, causing the pressure to decrease. Liquid enters the inter-tooth space under the pressure difference. With each rotation of the gears, the liquid between the teeth is carried to the discharge chamber. At this point, the inter-tooth volume at the point where the gear teeth mesh in the discharge chamber gradually decreases, discharging the liquid. Gear pumps are suitable for conveying lubricating liquids that do not contain solid particles, are non-corrosive, and have a wide viscosity range. The pump's flow rate can reach 300 m³/h, and the pressure can reach 3 × 10⁷ Pa. It is commonly used as a hydraulic pump and for conveying various oils. Gear pumps have a simple and compact structure, are easy to manufacture and maintain, and have self-priming capability, but they experience significant flow and pressure pulsations and are noisy. Gear pumps must be equipped with a safety valve to prevent damage to the pump or prime mover due to factors such as blockage of the discharge pipe causing the pump's outlet pressure to exceed the allowable value.

ATOS gear pumps are 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 pump outlet depends on the resistance at the pump outlet.

The rotational speed of an ATOS gear pump is actually limited, primarily depending on the process fluid. If the fluid being pumped is oil, the pump can rotate at very high speeds. However, when the fluid is a high-viscosity polymer melt, this limitation is significantly reduced. Driving high-viscosity fluids into the suction gear pump...

The two-tooth space on the inlet side of the gear pump is crucial. If this space is not fully filled, the pump cannot discharge 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 will be tailored to specific application processes to achieve optimal system capacity and price.

The PEP-II pump features a single integrated gear and shaft, achieved through a hardened process for extended 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 characteristic reduces the likelihood 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 remains aligned and preventing gear wear. A Parkool seal structure combined with a PTFE lip seal forms a water-cooled seal. This seal does not actually contact the shaft surface; its sealing principle involves cooling the polymer to a semi-molten state to create a self-sealing effect. Alternatively, a Rheoseal seal can be used, featuring 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 for compatibility with flange mountings on other equipment, simplifying the manufacture of cylindrical flanges. The PEP-II gear pump features optional heating elements matched to the pump's specifications, ensuring rapid heating and controlled heat distribution. Unlike internal pump heating, damage to these elements is limited to a single plate and does not affect 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 single gear pump in an extrusion production line can increase flow output speed, reduce material shearing and residence time within the extruder, and lower extrusion temperature and pressure pulsations, thereby improving productivity and product quality.

ATOS Gear Pump Installation Considerations:

When installing the ATOS gear pump, the following should be noted:

1. Conduct a detailed inspection of all components; all should meet the relevant standards.

2. The perpendicularity of the gear end faces to the shaft centerline and the parallelism of the gear end faces should both be qualified; the gear meshing should be good.

3. The shaft diameter should meet technical requirements, and the coaxiality of the bushing or bearing with the shaft diameter should be qualified.

4. The gear end face clearance should be adjusted appropriately.

5. When tightening the end face bolts, apply force symmetrically and evenly; rotate the rotor while tightening. If jamming occurs, loosen the bolts and retighten.

6. When adding packing and tightening the gland, rotate the rotor while tightening; do not overtighten.

ATOS Gear Pump Usage Precautions:

The following precautions should be taken when using the ATOS gear pump:

(1) The pump drive shaft and the prime mover output shaft should be installed using a flexible coupling with a coaxiality deviation of less than 0.1mm. For shaft sleeve couplings, the coaxiality deviation should be less than 0.05mm.

(2) The transmission device should ensure that the pump's drive shaft is under stress within the allowable range.

(3) The pump's suction height should not exceed 0.5m.

(4) A mesh filter is usually installed at the pump's suction port, with a filter accuracy of less than 40μm. The filter installed on the system's return oil line should ideally have an accuracy of less than or equal to 20μm. (5) The working fluid should be selected strictly according to regulations, with a working temperature range of -20 to 80 ℃.

(6) The pump's rotation direction must be correct, meaning the pump's inlet and outlet positions must be correct. Disassembly and assembly of the pump must be strictly performed according to the manufacturer's instruction manual.

(7) Tighten the screws on the pump's inlet and outlet pipe joints. The sealing devices must be reliable to prevent cavitation and oil leakage, which would affect the pump's performance. Avoid starting the pump under load and stopping it under load.

(8) Before starting, check that the relief valve (safety valve) in the system is at the set permissible pressure.

(9) For new pumps or repaired hydraulic pumps, perform no-load operation and a short period of overload operation before operation. Then check the pump's working condition; leaks, impact sounds, excessive heat, and noise are not allowed.

(10) If the pump is not used for a long time, it should be disconnected from the prime mover. When reusing, do not immediately apply maximum load; allow at least 10 minutes of no-load operation.

PFG-114

PFG-120

PFG-128

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 PFGXF-114/D

PFGXF-120/D

PFGXF-128/D

PFGXF-142/D

PFGXF-160/D

Our company mainly deals in European and American brands and can source brands from any European country. For example, our advantageous German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM door 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