ATOS piston pump PVPC-LZQZ-3029/1D/18 in stock

Brand

ATOS/Italian Atos

Application Areas

Chemical, Petroleum, Mining, Road/Rail/Marine, Comprehensive

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The pumping mechanism of the ATOS plunger pump consists of two precision pairs: a plunger and a plunger sleeve (Figure 5-11) to form the plunger and barrel assembly, and a delivery valve and a delivery valve seat to form the delivery valve assembly.

The plunger and plunger sleeve of the ATOS plunger pump are a precision pair, mated and ground together, and are not interchangeable. They require high precision, a smooth surface, and good wear resistance, with a radial clearance of 0.002–0.003 mm. The ATOS plunger pump features a grooved surface on the cylindrical plunger head, connected to the top via radial and axial holes. This design alters the circulating fuel supply. The plunger sleeve has inlet and outlet ports, both communicating with the low-pressure oil chamber within the pump body. After the plunger sleeve is installed in the pump body, it is secured with locating screws.

The method of altering the fuel supply varies depending on the position of the groove on the plunger head.

The delivery valve and valve seat are also a precision pair, mating and grinding together; they are not interchangeable. Their clearance is 0.01mm.

The delivery valve is a one-way valve. Under spring pressure, the upper conical surface of the valve fits tightly against the valve seat. Its function is to isolate the high-pressure fuel line from the upper cavity of the plunger when fuel supply stops, preventing backflow of fuel from the high-pressure line into the injection pump.

: ATOS piston pumps generally employ a cylinder block rotation and end-face distribution method. A friction pair consisting of a bimetallic plate and a steel distributor plate is inlaid on the cylinder block end face, and most use a planar distribution method, making maintenance relatively convenient. The distributor plate is one of the key components of the axial piston pump. During pump operation, on the one hand, the high-pressure oil in the working chamber pushes the cylinder block towards the distributor plate; on the other hand, the oil film pressure between the distributor plate and the cylinder block forms a hydraulic counter-thrust force on the cylinder block, causing the cylinder block to move away from the distributor plate. The hydraulic clamping force Fn of the cylinder block on the distributor plate is designed to be slightly greater than the hydraulic counter-thrust force Ff of the distributor plate on the cylinder block, i.e., Fn/Ff = 1.05~1.1, ensuring normal pump operation and maintaining high volumetric efficiency.

ATOS Piston Pump Troubleshooting:

ATOS Piston Pump Flow Rate Problems

(1) Insufficient suction volume. This is caused by excessive resistance in the suction line or insufficient oil replenishment. For example, excessive pump speed, low oil level in the tank, air leakage in the inlet pipe, or clogged oil filter. (2) Excessive leakage. This is caused by excessive pump clearance and poor sealing. For example, the distributor plate may be scratched by metal fragments or iron filings, causing oil leakage at the end face; the one-way valve sealing surface in the variable mechanism may not fit properly; and there may be sand holes or scratches on the support surfaces of the pump body and distributor plate. The damaged part of the pump can be identified by checking for foreign matter mixed in the hydraulic oil inside the pump body.

(3) The swashplate angle is too small, resulting in a small pump displacement. This requires adjusting the variable piston to increase the swashplate angle.

Discharge is not zero in the neutral position.

The swashplate angle of the ATOS piston pump is zero when it is in the neutral position, at which point the pump's output flow should be zero. However, sometimes the neutral position deviates from the midpoint of the adjustment mechanism, and there is still flow output at the midpoint. This is caused by the controller's position deviation, loosening, or damage, requiring readjustment, tightening, or replacement. Insufficient pump angle holding force and wear on the swashplate trunnion can also cause this phenomenon.

ATOS piston pump output flow fluctuation. The output flow fluctuation of an ATOS piston pump is related to many factors. For variable displacement pumps, it can be attributed to poor control of the variable displacement mechanism, such as foreign objects entering the mechanism and causing scratches, wear marks, or damage on the control piston, resulting in unstable piston movement. Insufficient amplifier power or damaged parts, or poor damping efficiency of the control piston containing a spring, can also cause unstable piston movement. Unstable flow is often accompanied by pressure fluctuations. These types of faults generally require disassembling the hydraulic pump, replacing damaged parts, increasing damping, improving spring stiffness, and increasing control pressure.

ATOS Piston Pump Output Pressure Abnormalities

The output pressure of an ATOS piston pump is determined by the load and is approximately proportional to the input torque. There are two types of abnormal output pressure faults:

(1) Output Pressure Too Low

When the pump is in self-priming mode, if there is air leakage in the inlet line or significant leakage in the hydraulic cylinder, check valve, or directional valve in the system, the pressure will not rise. This requires finding the leak, tightening, or replacing the seals to increase the pressure. If the relief valve is faulty or the adjusted pressure is too low, the system pressure will also not rise; the pressure should be readjusted or the relief valve repaired. If the hydraulic pump cylinder body and distributor plate deviate, causing significant leakage, the cylinder body may crack in severe cases; in this case, the mating surfaces should be re-ground or the hydraulic pump replaced.

(2) Excessive Output Pressure

If the circuit load continues to increase, the pump pressure will also continue to increase, which is normal. If the load is constant and the pump pressure exceeds the required load value, the hydraulic components other than the pump, such as the directional valve, pressure valve, transmission device, and return oil line, should be checked. If the maximum pressure is too high, the relief valve should be adjusted.

ATOS Piston Pump Vibration and Noise

The vibration and noise of the ATOS piston pump occur simultaneously. They not only harm the machine operator but also pollute the environment.

(1) Mechanical Vibration and Noise

Noise can be generated by misalignment or jamming of the pump shaft and motor shaft, damage to bearings and couplings of the rotating shaft, broken elastic pads, and loose assembly bolts. For pumps operating at high speeds or transmitting large amounts of energy, regular inspections are necessary to record the amplitude, frequency, and noise of each component. If the pump's rotational frequency is the same as the natural frequency of the pressure valve, resonance will occur; the pump's speed can be changed to eliminate resonance.

(2) Noise generated by fluid flow in the pipeline

Noise can be generated by a narrow inlet pipe, insufficient flow capacity or blockage of the inlet filter, air intake in the inlet pipe, excessively high oil level, insufficient oil suction due to low oil level, and liquid hammer in high-pressure pipelines. Therefore, it is essential to design the oil tank correctly and select the appropriate filter, oil pipes, and directional valves.

ATOS piston pump hydraulic pump overheating

There are two main reasons for excessive heat generation in ATOS piston pumps: First, mechanical friction generates heat. Due to dry or semi-dry friction on the moving surfaces, heat is generated through friction between moving parts. Second, fluid friction generates heat. High-pressure oil leaks into the low-pressure chamber through various gaps, resulting in a significant loss of hydraulic energy as heat. Therefore, correctly selecting the clearance between moving parts, the tank volume, and the cooler can prevent excessive pump overheating and high oil temperature. Additionally, a clogged return oil filter causing excessive back pressure can also lead to high oil temperature and pump overheating.

ATOS Piston Pump Oil Leakage

ATOS piston pump oil leakage is mainly caused by the following:

(1) Damaged spindle oil seal or defects/scratches on the shaft;

(2) Excessive internal leakage increases pressure at the oil seal, damaging or dislodging it;

(3) An excessively thin or long drain pipe causes leakage at the seal;

(4) Loose external oil pipes, damaged pipe joints, aged or cracked gaskets; (5) Loose bolts in the variable adjustment mechanism, damaged seal;

(6) Sand holes or poor welding in the cast iron pump casing.

Key Features of the Italian ATOS Plunger Pump

Double plunger structure, low pressure pulsation, long sapphire ball life;

Imported sapphire plungers and sapphire balls ensure accurate flow;

Communicates with a computer via RS232 interface, allowing direct computer control;

Contact media materials are resistant to organic solvent corrosion;

Built-in overpressure protection and flow correction system;

Large LCD display;

Carefully designed venting device effectively removes air bubbles from the pumped liquid;

Flow and pressure settings can be memorized; Communication with PLC is possible (customizable)

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PVPC-C-5090 PVPC-CH-3029

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PVPC-LW-3029

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PVPC-LW-5073

PVPC-LW-5090 The company primarily deals in European and American brands, and can source brands from any European country. For example, its key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, HIRSCHMANN industrial switches, Henschler, MURR, SCHMERSAL, SAMSON, and EPRO (a subsidiary of Emerson).

American brands include MOOG, ASCO solenoid valves, MAC solenoid valves, NUMATICS, PARKER pneumatics and hydraulics, VICKERS, and ROSS.

British brands include Norgren. Italian brands OMAL, ATOS, CAMOZZI, UNIVER, and Camozzi.