Product Overview
The 3DREE16P-6X/200XYG24K31M is a Bosch Rexroth 3DREE series pilot-operated 3-way proportional pressure reducing valve, NG16 size, with mounting pattern conforming to ISO 4401, DIN 24340 Form A, and CETOP-RP 121H standards. This electrically pilot-operated 3-way pressure reducing valve provides pressure limitation of the actuator and is used for reducing a pressure (P to A) and limiting a system pressure (A to T).
The 3DREE series features integrated on-board electronics (OBE). The valve is controlled by the integrated electronics, enabling precise proportional control of the secondary circuit pressure via electrical signals. Spool position feedback ensures extremely high control accuracy. The “M” suffix indicates that the valve is equipped with a maximum pressure limitation function, providing mechanical overpressure protection in the event of electrical signal anomalies.
Model Code Breakdown (3DREE16P-6X/200XYG24K31M):
3DREE: Pilot-operated proportional pressure reducing valve with integrated electronics (OBE)
16: Nominal Size NG16
P: Subplate mounting
6X: 6X Component Series (60–69, unchanged installation and connection dimensions)
200: Pressure rating — 200 bar
X: Pilot oil supply/drain configuration — internal pilot supply, external pilot drain
Y: Drain port identifier
G24: DC 24V supply
K31: Control electronics interface — analog interface
M: With maximum pressure relief function
Technical Specifications
Model: 3DREE16P-6X/200XYG24K31M
Brand: BOSCH REXROTH
Series: 3DREE Series, 6X Component Series
Product Type: Pilot-operated 3-way Proportional Pressure Reducing Valve
Nominal Size: NG16
Mounting Standard: ISO 4401 / DIN 24340 Form A / CETOP-RP 121 H
Mounting Type: Subplate Mounting
Maximum Operating Pressure: 315 bar (31.5 MPa)
Maximum Flow Rate: 300 L/min
Pressure Setting: 200 bar
Pilot Oil Supply: Internal
Pilot Oil Return: External via Y port
Supply Voltage: 24V DC
Control Electronics: Integrated (OBE)
Maximum Pressure Limitation: Equipped (M suffix)
Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR
Key Technical Advantages
1. Integrated 3-Way Pressure Reducing and Relieving Function
The 3DREE16P-6X/200XYG24K31M features a 3-way design integrating pressure reduction (P→A) and pressure limitation (A→T) in a single valve. When the secondary circuit pressure exceeds the set value, the valve automatically opens the A→T path to limit the pressure. This integrated design eliminates the need for an external relief valve, simplifying manifold layouts.
2. Integrated On-Board Electronics (OBE) — No External Amplifier Required
The 3DREE series comes standard with integrated on-board electronics (OBE) , directly accepting analog command signals. The command value/pressure characteristic curve is factory-calibrated with minimal manufacturing tolerance. Compared to the 3DRE series requiring external amplifiers, the OBE design significantly simplifies the electrical control architecture, reduces external component count, and minimizes wiring complexity.
3. Maximum Pressure Protection (M suffix) for System Safety
The “M” suffix indicates that the valve is equipped with a spring-loaded maximum pressure protection valve, providing mechanical overpressure protection in the event of abnormally high electrical control current. This feature offers an additional safety layer for the actuator, preventing pressure失控 due to electrical faults.
4. 315 bar High Pressure and 300 L/min High Flow Capacity
Delivers 315 bar maximum operating pressure and 300 L/min flow capacity in an NG16 package. This performance places it at the forefront of pilot-operated proportional pressure reducing valves in its class, suitable for demanding medium-to-high flow hydraulic systems requiring precise pressure control.
5. Start-up Jump Prevention
With depressurized port P, springs (5) and (6) hold the main control spool in its central position, preventing a start-up jump at the actuator and protecting the actuator from damage.
6. International Standard Compliance for High Installation Compatibility
Mounting conforms to ISO 4401, DIN 24340 Form A, and CETOP-RP 121H international standards. Fully compatible with globally adopted interfaces for direct replacement of same-series, same-specification products. Subplates must be ordered separately per Rexroth catalog sheets.
7. Multi-Fluid Compatibility
Compatible with mineral oils (HL, HLP, HLPD, HVLP, HVLPD), biodegradable fluids (HETG, HEES, HEPG), and fire-resistant fluids (HFDU, HFDR), accommodating diverse industrial application requirements.
Application Areas
Injection Molding Machinery — Precise proportional control of injection and holding pressure
Die-Casting Machines — Proportional regulation of injection pressure with overpressure protection
CNC Machine Tools — Precise pressure control for hydraulic clamping and unclamping
Material Testing Machines — Precise proportional control of loading force
Metallurgical Equipment — Precise pressure control for rolling mill hydraulic systems
General Industrial Hydraulic Systems — Various applications requiring precise proportional pressure control
Expert Maintenance Tips
1. Installation Guidelines
Mounting surface must conform to ISO 4401, DIN 24340 Form A, and CETOP-RP 121H standards.
Subplates must be ordered separately per Rexroth catalog sheets.
Thoroughly clean the mounting surface and all ports (P, A, T, Y) before installation to prevent foreign particles from entering and causing spool sticking or seal damage.
Tighten mounting bolts evenly to the specified torque to ensure proper sealing between the valve body and mounting surface.
2. Y-Port Pilot Oil Return Considerations
This model features internal pilot oil supply with external return via port Y.
The Y-port return line must be routed directly to the tank without back pressure; otherwise, pilot control pressure stability will be compromised.
3. Hydraulic Fluid Cleanliness
Compatible fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR.
Recommended fluid cleanliness: ISO 4406 18/16/13 or better.
Install a return line filter with minimum 10 μm filtration rating.
4. Electrical Connection Specifications
3DREE16P-6X/200XYG24K31M uses 24V DC supply.
Command value input: Analog signal (K31 interface configuration).
Electrical connector per DIN EN 175201-804 standards. Ensure the connector is fully locked during installation.
Shielded cables are recommended for command signal connections to prevent electromagnetic interference affecting control precision.
5. Maximum Pressure Protection Verification
M suffix models are equipped with a built-in maximum pressure protection valve.
This protection valve is a spring-loaded mechanical device, factory-preset according to the pressure rating.
Do not arbitrarily adjust the maximum pressure protection valve setting, as this may compromise overpressure protection.
6. Periodic Maintenance Inspection
Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.
Check electrical connectors for looseness, oxidation, or moisture ingress.
Periodically inspect OBE electronics status to confirm normal power supply and command signal.
If response lag or reduced control precision is observed, first check system fluid cleanliness and verify the pilot spool is not sticking.
Proportional solenoid coils can be replaced without disturbing hydraulic connections.
