REXROTH

ZDB6VP2-4X/315V Bosch Rexroth Pressure Relief Valve

The Bosch Rexroth ZDB6VP2-4X/315V is a pilot-operated pressure relief valve developed for dependable pressure limitation in industrial hydraulic systems. Identified by material number R900409898, this size 6 valve uses a sandwich plate design and provides a pressure relief function from port P to port T. It limits hydraulic pressure to the selected setting and helps protect downstream hydraulic components from pressure conditions above the required operating level.

The compact sandwich plate configuration allows the valve to be installed between compatible subplates and directional control valves without requiring a separate in-line valve body. This arrangement supports modular hydraulic circuit construction and can reduce external piping inside hydraulic power units, manifold systems, and machine control assemblies. The ISO 4401-03-02-0-05 connection pattern enables integration with compatible size 6 mounting interfaces.

Key Features and Product Configuration

• Original Bosch Rexroth industrial hydraulic component
• Material number: R900409898
• Pilot-operated pressure relief valve
• Sandwich plate mounting design
• Nominal size 6
• Pressure relief function from P to T
• Maximum operating pressure: 315 bar
• Maximum flow: 60 l/min
• Manual pressure adjustment
• Sleeve with internal hexagon and protective cap
• ISO 4401-03-02-0-05 connection pattern
• Four hydraulic ports and two valve positions
• One pressure valve cartridge
• FKM sealing material
• Component series 4X, representing series 40 to 49

Technical Specifications

Pressure Control Function

This valve monitors pressure in the P channel and relieves excess hydraulic fluid toward the T channel when the preset pressure level is reached. Its pilot-operated construction supports stable pressure limitation in applications where a compact modular valve is preferred. The 315 bar pressure rating identifies the upper setting range of this configuration. The actual operating pressure must be selected according to the hydraulic circuit, actuator requirements, component ratings, and machine safety design.

Pressure is adjusted manually through a sleeve with an internal hexagon. A protective cap covers the adjustment point and helps prevent unintended access during normal operation. Before commissioning, the pressure setting should be established with suitable pressure-measuring equipment and verified under controlled operating conditions. The setting must not exceed the permitted pressure of the weakest component in the hydraulic circuit.

Industrial Applications

R900409898 is suitable for industrial hydraulic installations that require reliable pressure limitation in a size 6 modular valve stack. Typical applications include hydraulic power units, machine tools, forming equipment, hydraulic presses, production machinery, clamping circuits, material-handling systems, automated equipment, test benches, and customized manifold assemblies. Its P-to-T relief function is particularly suitable when the main pressure supply channel requires protection at a defined setting.

The ZDB6VP2-4X/315V sandwich plate format can simplify integration into new machinery and replacement projects. However, physical mounting compatibility alone is not sufficient for correct product selection. Engineers should verify the complete type code, pressure range, relief path, mounting pattern, seal material, hydraulic fluid, flow requirement, and adjustment method before installation.

Model Code and Identification

The complete type code contains important configuration information. “Z” identifies a sandwich plate valve, while “DB” identifies a pressure relief valve. The number “6” represents nominal size 6. “VP” specifies pressure relief from P to T, and “2” identifies the sleeve with internal hexagon and protective cap.

The designation “4X” represents component series 40 to 49 with unchanged installation and mounting dimensions within the series. “315” identifies a pressure setting range up to 315 bar, while the final “V” specifies FKM seals. The ZDB6VP2-4X/315V model and R900409898 material number should both be compared with the original valve nameplate and machine documentation before ordering.

Selection and Compatibility Notes

Pressure relief valves with similar external dimensions may have different pressure ranges, relief paths, seal materials, or adjustment mechanisms. A valve configured for relief from P to T must not be selected only by appearance or nominal size. Confirm that the required circuit function corresponds to symbol P → T and that the system flow does not exceed the specified maximum of 60 l/min.

The hydraulic fluid must also be compatible with the FKM seals used in this configuration. The manufacturer lists HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, and HFDR fluids. Fluid viscosity, operating temperature, cleanliness, and filtration must comply with the requirements of the applicable Bosch Rexroth technical documentation and the complete hydraulic system.

Installation and Maintenance Guidance

Before mounting the valve, clean the mating surfaces and confirm that the port arrangement matches the hydraulic circuit. Use appropriate sealing elements and mounting hardware, and follow the tightening specifications for the associated valve stack. Incorrect installation, damaged seals, or contamination in the pilot passages may affect pressure-control accuracy and system reliability.

During maintenance, inspect the valve for external leakage, damaged seals, contamination, and unauthorized changes to the pressure adjustment. Pressure adjustment and hydraulic servicing should only be performed by qualified personnel after the system has been safely depressurized. Always verify the adjusted pressure with calibrated measuring equipment before returning the machine to normal operation.

Related Hydraulic Pressure Valves

For another Bosch Rexroth sandwich plate pressure relief configuration, review the Bosch Rexroth ZDB10VP2-41/200V pressure relief valve. Additional hydraulic valves, pumps, motors, and industrial replacement components are available through Hydraulics Worldwide.

Official Bosch Rexroth Product Reference

For current manufacturer specifications, technical documents, CAD data, and product information, visit the official Bosch Rexroth page for ZDB6VP2-4X/315V R900409898. Always use the latest manufacturer documentation when designing, replacing, or commissioning hydraulic equipment.

Frequently Asked Questions

What is the main function of this valve?
It limits hydraulic pressure in the P channel by providing a relief path to T when the selected pressure setting is reached.

What are the maximum pressure and flow values?
The maximum operating pressure is 315 bar, and the maximum flow is 60 l/min.

How is the pressure adjusted?
The pressure is set manually through a sleeve with an internal hexagon and protective cap.

What should be checked before ordering?
Verify the complete model code, R900409898 material number, P-to-T relief function, 315 bar pressure range, size 6 ISO mounting pattern, FKM seals, hydraulic fluid compatibility, and required system flow.

Details