ATOS PFR Series Piston Pump Working Principle

Brand

ATOS/Italian Atos

Application Areas

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

Thank you for your interest in our products. If you would like to learn more, such as ATOS product prices, specifications, and other information, please feel free to contact us. We sincerely invite you to experience our satisfactory service!

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

ATOS Piston Pump Output Flow Fluctuations

Output flow fluctuations are related to many factors. For variable displacement pumps, this can be attributed to poor control of the variable displacement mechanism, such as foreign objects entering the mechanism, causing scratches, abrasions, or damage on the control piston, resulting in unstable piston movement. Insufficient amplifier power or damaged parts, and poor damping efficiency in control pistons containing springs, 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 adjusting control pressure.

ATOS Piston Pump Output Pressure Abnormality

The output pressure of the 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 rupture in severe cases; in this case, the mating surfaces should be re-ground or the hydraulic pump replaced.

(2) Output Pressure Too High

If the circuit load continues to increase, the pump pressure will also continue to rise, which is normal. If the load is constant and the pump pressure exceeds the required pressure value, check hydraulic components other than the pump, such as directional valves, pressure valves, transmission devices, and return lines. If the maximum pressure is too high, adjust the relief valve.

ATOS Piston Pump Vibration and Noise

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

(1) Mechanical Vibration and Noise

Noise will be generated if the pump shaft and motor shaft are misaligned or jammed, or if the bearings and couplings of the rotating shaft are damaged, the elastic pads are broken, or the mounting bolts are loose. For pumps operating at high speeds or transmitting large amounts of energy, regular inspections should be conducted, and the amplitude, frequency, and noise of each component should be recorded. If the pump's rotational frequency is the same as the natural frequency of the pressure valve, resonance will occur; the pump speed can be changed to eliminate resonance. (2) Noise Generated by Fluid Flow in Pipelines

Noise can be generated by various factors, including an excessively narrow inlet pipe, an inlet filter with insufficient flow capacity or blockage, air intake in the inlet pipe, excessively high oil level, insufficient oil suction due to low oil level, and liquid slugging in high-pressure pipelines. Therefore, proper design of the oil tank and correct selection of filters, oil pipes, and directional valves are essential.

ATOS Piston Pump Overheating

There are two main causes of overheating 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 converted into heat. Therefore, proper selection of the clearance between moving parts, oil tank volume, and cooler can prevent excessive pump overheating and high oil temperature. Additionally, a clogged return oil filter causing excessive return oil back pressure can also lead to high oil temperature and pump overheating. The main causes of oil leakage in ATOS piston pumps are as follows:

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

(2) Excessive internal leakage, causing increased pressure at the oil seal, which damages or blows it out;

(3) The drain pipe is too thin or too long, causing oil leakage at the seal;

(4) Loose external oil pipes, damaged pipe joints, aged or cracked gaskets;

(5) Loose bolts in the variable displacement adjustment mechanism, resulting in a damaged seal;

(6) Sand holes or poor welding in the cast iron pump casing. PVPC-C-5073/1D

PVPC-C-5073/1S 10

PVPC-CH-5073/1D-IX 24DC

PVPC-CZ-5073/1D 12

PVPC-LQZ-5073/1D 11

PVPC-LW-4046/1D 10

PVPC-LZQZ-3029/1D

PVPC-LZQZ-3029/1D/18

PVPC-LZQZ-4046/1D

PVPC-LZQZ-4046/1D/18

PVPC-LZQZ-5073/1D 11

PVPC-LZQZ-5073/1D/18

PVPC-R-3029/1D 11 PVPC-R-4046/1D 11

PVPC-SLE-3029/10 20

PVPC-SLE-4046/1D 20

PVPCX2E-C-3029/31036/1D 10

PVPCX2E-LW-3029/31036/1D 10

PVPC-C-3029

PVPC-C-4046

PVPC-C-5073

PVPC-C-5090

PVPC-CH-3029

PVPC-CH-4046

PVPC-CH-5073

PVPC-CH-5090

PVPC-R-3029

PVPC-R-4046

PVPC-R-5073

PVPC-R-5090 PVPC-L-3029

PVPC-L-4046

PVPC-L-5073

PVPC-L-5090

PVPC-LW-3029

PVPC-LW-4046

PVPC-LW-5073

PVPC-LW-5090

Working Principle of Italian ATOS Piston Pumps

The Italian ATOS piston pump is an important component of a hydraulic system. It relies on the reciprocating motion of the piston within the cylinder to change the volume of the sealed working chamber, thus achieving oil suction and pressure. Piston pumps have advantages such as high rated pressure, compact structure, high efficiency, and convenient flow adjustment, and are widely used in high-pressure, high-flow, and flow-adjustable applications, such as hydraulic presses, construction machinery, and ships.

The Italian ATOS piston pump is a type of reciprocating pump, belonging to the category of volumetric pumps. Its piston is driven by the eccentric rotation of the pump shaft, resulting in reciprocating motion. Both its suction and discharge valves are one-way valves. When the plunger is pulled outward, the pressure in the working chamber decreases, the outlet valve closes, and when the pressure is lower than the inlet pressure, the inlet valve opens, allowing liquid to enter. When the plunger is pushed inward, the pressure in the working chamber increases, the inlet valve closes, and when the pressure is higher than the outlet pressure, the outlet valve opens, allowing liquid to exit. When the drive shaft drives the cylinder block to rotate, the swashplate pulls the plunger out of or pushes it back into the cylinder block, completing the oil suction and discharge process. The oil in the working chamber formed by the plunger and cylinder bore communicates with the pump's suction and discharge chambers through the distribution plate. The variable displacement mechanism is used to change the swashplate's tilt angle; by adjusting the swashplate's tilt angle, the pump's displacement can be changed.