ATOS piston pump PVPC-L-5073/5S in stock

Brand

ATOS/Italian Atos

Application Areas

Medical & Health, Environmental Protection, Food/Agricultural Products, Chemical Industry, Petroleum

Working Principle of Italian ATOS Piston Pump

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 offer 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, reciprocating in motion. Both its suction and discharge valves are one-way valves. When the piston 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 piston 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 rotates the cylinder block, the swashplate pulls the plunger out 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; adjusting the swashplate's tilt angle changes the pump's displacement.

(Italian ATOS)

Structural Forms: Plunger pumps are divided into two representative structural forms: axial plunger pumps and radial plunger pumps. Radial plunger pumps...

Plunger pumps

are a new type of high-efficiency pump with relatively high technological content. With the continuous acceleration of domestic production, radial plunger pumps will inevitably become an important part of the plunger pump application field; for details, please refer to the radial plunger pump encyclopedia. The following explanation only uses axial plunger pumps as an example.

Axial plunger pumps work by utilizing the volume change generated by the reciprocating motion of a plunger parallel to the drive shaft within the plunger bore. Because both the plunger and plunger bore are circular parts, they can be machined to achieve very high precision, resulting in advantages such as high volumetric efficiency, smooth operation, good flow uniformity, low noise, and high working pressure. However, they are more sensitive to hydraulic oil contamination, have a more complex structure, and are more expensive.

The ATOS plunger pump's pumping mechanism comprises two precision components: a plunger and barrel assembly (Figure 5-11) consisting of a plunger and barrel sleeve, and a delivery valve assembly consisting of a delivery valve seat.

The plunger and barrel sleeve are a precision pair, mated and ground together, and are not interchangeable. They require high precision, a smooth surface finish, and good wear resistance, with a radial clearance of 0.002–0.003 mm.

The plunger head has a beveled groove cut into its cylindrical surface, communicating with the top through radial and axial holes. This changes the circulating oil supply. The barrel sleeve has inlet and outlet oil holes, both communicating with the low-pressure oil chamber inside the pump body. After the barrel sleeve is installed in the pump body, it is secured with a locating screw.

The method of changing the oil supply varies depending on the position of the beveled groove on the plunger head.

The delivery valve and delivery valve seat are also a precision pair; they are not interchangeable after mating and grinding, with a clearance of 0.01mm.

The delivery valve is a one-way valve. Under spring pressure, the upper conical surface of the valve fits tightly with 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 fuel from flowing back into the injection pump.

The lower part of the delivery valve has a cross-section, which serves both as a guide and allows diesel fuel to pass through. Below the conical surface of the delivery valve is a small cylindrical surface called a pressure-reducing ring. Its function is to rapidly reduce the fuel pressure in the high-pressure fuel line when fuel supply ends, preventing dripping at the nozzle. When the ring falls into the valve seat, the upper volume rapidly increases, the pressure rapidly decreases, and injection stops quickly.

(ATOS Italy Maintenance Types) Swashplate axial 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 Troubleshooting (Italy)

ATOS Piston Pump Flow 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 variable axial piston pump is called the neutral position when it is zero. At this time, 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 of the swashplate trunnion can also cause this phenomenon.

ATOS piston pump output flow fluctuation. Fluctuations in the output flow rate of ATOS piston pumps 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, wear marks, or damage on the control piston, resulting in unstable piston movement. Insufficient amplifier power or damaged parts, and poor damping efficiency in spring-loaded control pistons, can also cause unstable piston movement. Unstable flow rate 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 pump's output pressure is determined by the load and is approximately proportional to the input torque. There are two types of abnormal output pressure faults.

ATOS Piston Pump

ATOS Piston Pump

ATOS PVPC-L-5073/5S 0501216278 / LEFT

ATOS PVPC-L-5073/5S 050126278/Left, 1 unit

ATOS Piston Pump

PVPC-LZQZ-5073/1D/18

PVPC-C-3029/1D

PVPC-C-3029/1D 11 /WG

PVPC-C-4046/1D

PVPC-C-4046/1S

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 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. We have distributorships for Italian brands such as OMAL, ATOS, CAMOZZI, UNIVER, and Camozzi.

We also have companies in the US, partnering with brands like ASCO, VICKERS, MAC, PARKER, MOOG, FAIRCHILD, DENISON, ROSS, UE, MTS, and GEFRAN, totaling approximately 200 brands.

We hold distribution rights for Japanese brands such as CKD, TOYOOKI, NACHI, DAIKIN, SMC, KOGANEI, TACO, NOK, and TOKIMEC.