DR constant pressure valve

5 month ago

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3 year

Product details

The DR constant pressure valve A4VSO-DR is a specific model of the axial piston pump with constant pressure and variable displacement produced by Rexroth. Below is an explanation of its detailed content:

1. Model Interpretation:

• A4VSO: Indicates that the pump belongs to Rexroth's A4VSO series.

• DR: Represents that the pump is of the direct remote type (Direct Remote), meaning its system pressure is directly set by the pump's pilot valve (also known as the pressure compensator). In contrast, the parallel type (P-type) has its system pressure controlled by an overflow valve.

2. Functional Characteristics:

• Constant pressure and variable displacement: The pump can automatically adjust its flow rate according to system demand while maintaining a constant system pressure.

• Axial piston structure: It adopts a swashplate axial piston structure, with flow rate proportional to driving speed and displacement. Variable displacement can be achieved by adjusting the swashplate angle.

• Remote control: Remote control is facilitated through the pilot valve (pressure compensator), allowing precise setting and adjustment of system pressure.

3. Application Scenarios:

• The pump is widely used in hydraulic systems requiring constant pressure output, such as in machine tools, metallurgy, forging presses, mining, and crane hydraulic transmission systems.

• It is particularly suitable for high-power hydraulic transmission systems and open-circuit systems requiring efficient and stable hydraulic drives.

4. Performance Parameters:

• Displacement specifications: Depending on the specific model, displacement specifications vary, commonly including 40, 71, 125, 180, 250 ml/rev, etc.

• Rated working pressure: Can reach 35 MPa (or 350 Bar), with some models offering higher pressure ratings.

• Control mode: Typically DR-type constant pressure control, but Rexroth also offers multiple other control modes for user selection, such as hyperbolic constant power automatic control (LR type), electrical proportional control (EO2 type), etc.

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