Radial piston pumps, fixed displacement PR4-1X

Радиально-поршневые насосы с фиксированным рабочим объемом PR4-1X от Bosch Rexroth — это гидравлические насосы, которые выполняют следующие функции и задачи:

1. Перекачивают гидравлическую жидкость из одного места в другое. Они создают высокое давление, чтобы жидкость могла преодолеть сопротивление и перемещаться по системе.
2. Управляют движением гидравлических приводов, таких как гидроцилиндры или гидромоторы. Насосы создают необходимое давление для перемещения поршня или вала, что позволяет управлять движением различных механизмов и систем.
3. Регулируют поток жидкости в системе. Они могут изменять скорость и объем жидкости, поступающей в гидравлическую систему, что позволяет контролировать скорость и силу движения механизмов.
4. Поддерживают постоянное давление в гидравлической системе. Насосы компенсируют изменения давления, вызванные различными факторами, такими как нагрузка или температура, и поддерживают стабильное давление для эффективной работы системы.

Характеристики радиально-поршневых насосов PR4-1X:

• фиксированный рабочий объем, то есть насосы постоянно поставляют одинаковый объем жидкости за один оборот;
• обладают высокой производительностью и способны создавать высокое давление, что позволяет эффективно работать с различными гидравлическими системами;
• компактный и легкий дизайн, который облегчает их установку и использование в различных условиях;
• высокая надежность и долговечность в течение длительного времени.

Радиально-поршневые насосы с фиксированным рабочим объемом PR4-1X Bosch Rexroth широко используются в промышленности, сельском хозяйстве, строительстве, автомобильной промышленности и других сферах. Они применяются в гидравлических системах для управления и перемещения различных механизмов и оборудования.
 

Description

• Size 0,40 … 2,00
• Component series 1X
• Maximum operating pressure 700 bar
• Maximum displacement 2 cm³

Features

• Fixed displacement
• Self-priming, valve-controlled
• Long service life due to hydro-dynamically lubricated plain bearings
• Very compact design and installation-friendly dimensions
• Combination possibility with constant and variable vane pump
• Five sizes

Product description

Assembly

The pumps are valve-controlled, self-priming radial piston pumps with fixed displacement.

They consist essentially of the housing (1), eccentric shaft (2) and pump elements (3), with suction valve (4), pressure valve (5) and piston (6).

Suction and displacement process

Pistons (6) are arranged radially to the eccentric shaft (2). The piston (6) is guided in cylinder (7) and pressed against the eccentric (2) by the spring (8). During the downward movement of piston (6), the working chamber (9) in the cylinder (7) increases in size. The resulting negative pressure lifts the suction valve plate (4.1) from the sealing edge. This opens the connection from the suction chamber (10) to the working chamber (9). The working chamber fills with fluid. During the upward movement of piston (6), the suction valve closes and the pressure valve (5) opens. Fluid can now flow to the system via pressure port (P).

Type code

Design options with multi-circuit pumps The following can be seen from the following schematic representations: the number and position of the pressure ports which cylinders are combined. Points mark the cylinders which are directly located at the pressurized pressure port. Circles mark the cylinders which are not directly located at the pressurized pressure port. The dashed and/or dot and dash lines show which cylinders are in each case combined. The pressurized pressure ports are designated in clockwise direction. The pressure port that - in clockwise direction - is closest to the suction port is referred to as P1 .	Type code (Pos. 08)	Number of pressure ports	3 pistons
	01	1
	03	3

Technical data

For pumps with 3 pressure ports, type “03“ applies the following:

Using various operating pressures for each cylinder the drive power of the highest cylinder pressure is to be selected.

▼ Example: Pump PR4–1X/0.63–700...03

Ports 1 and 2, respectively loaded with 450 bar, 3 is circulating at zero pressure.

PA = 0.74 kW

Diagrams/characteristic curves

Sound pressure level

Dimensions

Version with one pressure port

Dimensions in mm

Version with three pressure ports

Dimensions in mm

Project planning information

Installation instructions

Fluid tank

• Adjust useful volume of the tank to the operating conditions.

• The admissible fluid temperature must not be exceeded; use coolers, if necessary.

Lines and ports

• Remove protection plugs from the pump.

• We recommend the use of seamless precision steel pipes according to DIN EN 10305-1 and removable pipe connections.

• Select the clear width of pipes according to the ports (suction speed 1 to 1.5 m/s).

• Inlet pressure, see technical data.

• Thoroughly clean pipelines and fittings prior to installing.

Proposal for piping layout

• Under no circumstances may drain and returning fluid be drawn directly into the suction port again, i.e., select the largest possible distance between suction line and return line.

• The return drain must always be below the oil level.

• Ensure suction-tight installation of the pipes.

Filter

Use a return flow or pressure filter, if possible.

(Suction filters only in connection with underpressure switch/clogging indicator).

Hydraulic fluid

• Please observe our specifications according to data sheet 90220.

• We recommend brand name hydraulic fluids.

• Do not mix hydraulic fluids of different types since this can result in decomposition and deterioration of the lubricity.

• The hydraulic fluid must be replaced at regular intervals according to the operating conditions. When doing this, the hydraulic fluid reservoir must also be cleaned of residues.

Drive

Electric motor + pump carrier + coupling + pump

• No radial or axial forces permissible on the pump drive shaft!

• Motor and pump must be exactly aligned!

• Always use a coupling that is suitable for compensating for shaft offsets!

• When installing the coupling, avoid axial forces, i.e., when installing, do not hammer or press the coupling onto the shaft! Use the female thread on the drive shaft.

Installation positions

• Horizontal installation (B3, B5): Always position the suction port over the pressure port. This arrangement supports bleeding of the pump.

• Vertical installation (V1): No restrictions

B3

B5

V1

Project planning information

When using radial piston pumps, we recommend particularly observing the information specified below. Project planning, assembly and commissioning of the radial piston pumps require the employment of trained experts.

Technical data

All specified characteristic depend on production tolerances and are valid at certain boundary conditions. Please note that consequently, certain scatter ranges are possible and that with changed boundary conditions (e.g. viscosity), the characteristics may also change.

Characteristic curves for flow and consumed power

When designing the drive motor, please observe the maximum application parameters possible.

Noise

The values for sound pressure level shown under Diagrams/characteristic curves have been measured according to DIN 45635 part 26. That means only the sound emission of the pump is shown. Environmental influences (such as place of installation, piping, etc.) have been eliminated. The values are in each case only valid for one pump. For circulation at zero pressure, the pressure line must be preloaded by means of a check valve (cracking pressure p = 5 bar) due to noise development.

Notice

Due to the power unit construction and the influence at the final place of installation of the pump, the sound pressure level will usually be 5 to 10 dB(A) higher than the value of the pump itself.

Commissioning

Commissioning instructions

Air bleeding

• All PR4 radial piston pumps are self-priming.

• Fill the housing with filtered oil via port S.

• During initial commissioning, set the pump to pressureless circulation. To do so, release the pressure hose and direct it into the reservoir.

• Before initial commissioning, the pump must be air-bled to protect it against damage.

• Switch to pressureless circulation, or direct the pressure line or pressure hose back into the reservoir.

• Briefly switch the pump on (inching mode).

• Should the pump not displace bubble-free oil after approx. 20 seconds, re-check the system. After the operating values have been reached, check the pipe connections for leakage. Check the operating temperature.

• Be aware of noise generation.

Commissioning

• Check whether the system is thoroughly and properly installed.

• Start the pump without load and let it displace fluid without pressure for a few seconds in order to ensure sufficient lubrication.

• In no case may the pump be operated without hydraulic fluid!

Note

• Adjustment, maintenance and repair of the pump may only be carried out by authorized, trained and instructed personnel!

• Use only original Rexroth spare parts!

• The pump may only be operated within the permissible data.

• The pump may only be operated when in perfect condition!

• When carrying out any work on the pump (e.g. installation and removal) the system must be switched off and depressurized!

• Unauthorized conversions and changes, affecting the safety and function are not permissible!

• Mount protective devices (e.g., coupling protection)!

• Do not remove any existing protective devices!

• The generally valid safety and accident prevention regulations must be strictly observed!

Downloads

Radial piston pump PR4 series 1X Data Sheet | RE11260 | 2017-08-31 | English | PDF | 291k Product Groups: Radial piston pumps Sizes 0,40 to 2,00