ATOS gear pump PFG-187/D in stock

Brand

ATOS/Italian Atos

ATOS cylinders, ATOS relief valves, ATOS proportional valves, ATOS stack valves, ATOS solenoid valves, ATOS amplifiers, ATOS solenoid directional valves, ATOS pressure reducing valves, ATOS safety valves, ATOS control valves

ATOS gear pumps are a type of positive displacement pump. They consist 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. A gear pump is a rotary pump that transports or pressurizes liquid by changing and moving the working volume formed between the pump cylinder and the meshing gears. 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 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," housing the two gears with their outer diameter and sides tightly fitted to the housing. Material from the extruder enters between the two gears at the inlet and fills this space. As the gears rotate, it 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. Due to the continuous meshing of the gears, this phenomenon occurs continuously, thus providing a continuous discharge volume at the pump outlet. The discharge volume is the same for each revolution of the pump. With the continuous rotation of the drive shaft, the pump continuously discharges fluid. The pump flow rate is directly related to the pump speed. In reality, a small amount of fluid is lost 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, thus preventing 100% fluid discharge from the outlet. Therefore, 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 outlet side, the pump will force fluid through them. If this damper changes during operation—for example, if the filter becomes dirty or clogged, or the back pressure of the restrictor 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 rotational speed of an ATOS gear pump is actually limited, primarily depending on the process fluid. If the fluid is an oil, the pump can rotate at very high speeds, but this limitation is significantly reduced when the fluid is a high-viscosity polymer melt. Propelling the high-viscosity fluid into the two-tooth space on the inlet side of the gear pump is crucial; if this space is not 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 (volume discharged per revolution). These pumps are matched to specific application processes to achieve optimal system capacity and price.

ATOS gear pumps feature integrated gears and shafts, using a through-hardening 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 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 based on cooling 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 unrelated 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 on an extrusion production line can increase flow rate, reduce material shearing and residence time within the extruder, and lower extrusion temperature and pressure pulsation, thereby improving productivity and product quality.

ATOS Gear Pump Installation Notes:

When installing an ATOS gear pump, pay attention to the following:

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

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

3. The shaft diameter should meet the 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; tighten while rotating the rotor. If jamming occurs, loosen the bolts and retighten.

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

ATOS Gear Pump Usage Precautions:

When using an ATOS gear pump, the following precautions should be taken:

(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 0.1 mm. For a bushing coupling, the coaxiality deviation should be less than 0.05 mm.

(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 0.5 m.

(4) A mesh filter should be installed at the pump's suction port, with a filter accuracy of less than 40 μm. For filters installed on the system's return oil line, the accuracy should ideally be less than or equal to 20 μm.

(5) The working oil 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, i.e., 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 inlet and outlet pipe joints. Ensure the sealing devices are reliable to prevent cavitation and oil leakage, which would affect pump 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 its set permissible pressure.

(9) For new pumps or overhauled hydraulic pumps, perform no-load operation and a short period of overload operation before use. Then check the pump's operating condition; no leakage, impact noise, excessive heat, or excessive noise is allowed.

(10) If the pump is not used for a long time, disconnect it from the prime mover. When using it again, do not immediately use the maximum load; allow at least 10 minutes of no-load operation. 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

PFGXF-174/D

PFGXF-187/D

PFGXF-199/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 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

ATOS proportional valves, ATOS stack valves, ATOS solenoid valves