DR30-5-5X/200YM | Rexroth Pressure Reducing Valve 350bar 400L/min

Product Overview

The DR30-5-5X/200YM (Material Number R900597158) is a classic model in the Bosch Rexroth DR series of pilot-operated pressure reducing valves, NG30 size. The DR series is designed to limit, reduce, or control system pressure. The valve primarily consists of a screw-in cartridge valve (cartridge) and housing, optionally with or without a check valve (subplate mounting only).

The DR30-5-5X/200YM features pilot-operated construction with pilot oil supplied internally and returned externally via port Y. In the rest position, the valve is open, allowing hydraulic fluid to flow freely from the inlet channel to the outlet channel. The outlet pressure is applied to the spring-loaded side of the main control spool, balancing against the spring-set value to achieve precise pressure reduction. This model features mechanical adjustment with a bushing with hexagon and protective cap. Seal material is NBR, compatible with HL, HLP, HLPD, HVLP, HVLPD, and HFC hydraulic fluids.

As an original Bosch Rexroth pilot-operated pressure reducing valve, this product offers complete interchangeability within the same series and size, requiring no modifications to mounting interfaces or piping layouts.

Model Code Breakdown (DR30-5-5X/200YM):

• DR: Pilot-operated Pressure Reducing Valve

• 30: Nominal Size NG30

• 5: Adjustment type code — Bushing with hexagon and protective cap

• 5X: 5X Component Series (50–59, unchanged installation and connection dimensions)

• 200: Pressure setting (200 bar)

• Y: Pilot oil supply configuration — internal supply, external return via Y port

• M: Subplate mounting

Technical Specifications (Bulleted List)

• Model: DR30-5-5X/200YM

• Material Number: R900597158

• Brand: BOSCH REXROTH

• Product Type: Pilot-operated Pressure Reducing Valve

• Nominal Size: NG30 (ISO 7368)

• Component Series: 5X (50–59, unchanged installation and connection dimensions)

• Maximum Operating Pressure: 315 bar (4568 psi) （350 bar per some sources）

• Maximum Flow Rate: 400 L/min (105 GPM) （@ Δp ~5 bar）

• Pressure Setting: 200 bar

• Adjustment Type: Mechanical

• Adjustment Element: Bushing with Hexagon and Protective Cap

• Pilot Oil Supply: Internal

• Pilot Oil Return: External via Y port

• Seal Material: NBR

• Weight: 8.441 kg

• Connection Type: Subplate Mounting, per ISO 5781-09-13-0-16

• Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HFC

• Fluid Temperature Range: -20°C to +80°C

• Recommended Viscosity: 10–400 mm²/s

• Threaded Connection: G1 1/2″

Key Technical Advantages

1. Pilot-Operated Design — High-Pressure High-Flow with Precise Control

The DR30-5-5X/200YM features pilot-operated construction. Compared to direct-acting pressure reducing valves, the pilot-operated design delivers superior pressure/flow stability, lower hysteresis, and more precise pressure control. Maximum flow reaches 400 L/min with a maximum operating pressure of 315 bar, placing it at the forefront of pressure reducing valves in its class.

2. Internal Pilot Supply with External Y-Port Return

This valve features internal pilot oil supply with external return via port Y. The external pilot oil return ensures stable pilot control circuit performance, preventing return line back pressure from interfering with the set pressure. Pressure at port Y is added 1:1 to the set reduced pressure.

3. 5X Component Series — Proven Standardized Platform

The DR30-5-5X/200YM belongs to the 5X Component Series (50–59). The 5X series represents Rexroth‘s standardized DR valve platform with stable installation and connection dimensions, offering complete interchangeability for convenient maintenance and replacement.

4. Mechanical Hexagon Sleeve Adjustment — Stable and Reliable

Equipped with a bushing with hexagon and protective cap adjustment element. The mechanical adjustment design is simple and reliable, enabling pressure setting adjustment under system operating conditions using standard tools. The DR series offers 4 adjustment types — rotary knob, bushing with hexagon and protective cap, lockable rotary knob with scale, and rotary knob with scale.

5. NBR Seals with Multi-Fluid Compatibility

Equipped with NBR seals, compatible with HL, HLP, HLPD, HVLP, HVLPD, HFC, and other mineral oil-based hydraulic fluids. For phosphate ester and other specialty fluids, FKM (fluoroelastomer) seals are available.

6. International Standard Compliance for Global Interchangeability

Mounting conforms to ISO 5781-09-13-0-16 standards. Fully compatible with globally adopted NG30 size interfaces for direct replacement of same-series, same-specification products. Optional check valve (subplate mounting only) and pressure gauge connection are available.

Application Areas

• Injection Molding Machinery — Precise pressure control for secondary hydraulic circuits

• Hydraulic Presses and Forging Equipment — Pressure switching and regulation for slide advance and return

• Heavy Construction Machinery — High-flow, high-pressure hydraulic systems for large excavators and loaders

• Steel and Mining Equipment — Pressure control for rolling mills and heavy-duty systems

• Marine and Port Machinery — Pressure control for large winch and crane hydraulic systems

• General Industrial Hydraulic Systems — Various high-flow applications requiring main system pressure reduction for sub-circuits

Expert Maintenance Tips

1. Installation Guidelines

• DR30-5-5X/200YM is subplate mounting type. Mounting surface must conform to ISO 5781-09-13-0-16 standards.

• Thoroughly clean the mounting surface and all ports (A, B, 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.

• An optional check valve (subplate mounting only) is available for free return flow from A to B.

2. Y-Port Pilot Oil Return Considerations

• Pressure at port Y is added 1:1 to the set reduced pressure.

• Ensure the Y-port return line has no back pressure or has constant back pressure during system design—otherwise, the outlet pressure setting will be directly affected (every 1 bar increase in Y-port back pressure increases the outlet pressure setting by 1 bar).

• The Y-port return line should be routed directly to the tank, avoiding shared return lines with other circuits.

3. Hydraulic Fluid Cleanliness

• Compatible fluids: HL, HLP, HLPD, HVLP, HVLPD, HFC.

• Seal material: NBR. For phosphate ester and other specialty fluids, select FKM (fluoroelastomer) seals.

• Recommended viscosity: 10–400 mm²/s.

• Fluid temperature range: -20°C to +80°C.

• Install a return line filter with minimum 10 μm filtration rating.

4. Pressure Setting Adjustment

• DR30-5-5X/200YM factory pressure setting: 200 bar.

• Pressure adjustment is performed via the bushing with hexagon and protective cap—turn clockwise using a standard tool to increase, counterclockwise to decrease.

• Adjust gradually under system operating conditions to achieve the desired pressure value.

5. Periodic Maintenance Inspection

• Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.

• If reduced pressure instability or slow response is observed, first check system fluid cleanliness and verify the pilot spool is not sticking.

• Periodically check that the Y-port return line is clear to prevent abnormal back pressure from affecting setting accuracy.

• The pressure gauge connection can be used for outlet pressure monitoring.