ZDR10VP5-3X/315YMSO30 | Rexroth Pressure Reducing Valve 315bar 100L/min

Product Overview

The ZDR10VP5-3X/315YMSO30 is a Bosch Rexroth ZDR series pilot-operated pressure reducing valve, NG10 (CETOP 5) size, with sandwich plate design conforming to ISO 4401-05-04-0-05 and NFPA T3.5.1 R2-2002 D05 standards. This valve is used to reduce system pressure to a set value and limit the secondary circuit pressure. The ZDR10VP5-3X/315YMSO30 is the P-port reducing version—pressure reduction is effected in channel P. This model belongs to the 3X Component Series (30–39) with stable installation and connection dimensions.

The valve features pilot-operated construction—in its initial position, the valve is open, allowing hydraulic fluid to flow freely from channel P₂ to channel P₁. The pressure in channel P₁ acts simultaneously on the main spool end face and, via the orifice, on the spring-loaded side of the main spool and the pilot poppet. When the pressure in channel P₂ exceeds the set value of the compression spring, the pilot poppet opens. Hydraulic fluid flows from the spring-loaded side of the main spool via the orifice and pilot poppet into the spring chamber, enabling the main spool to maintain constant pressure in channel P₁. Pilot oil return is via port T_A. A pressure gauge connection enables monitoring of the secondary pressure.

About the “SO30” Suffix:

“SO30” is a factory internal configuration code for this model. The base model is ZDR10VP5-3X/315YM (Material Number R900438840), with the “SO30” suffix indicating specific configuration options added to the standard model. The “SO30” suffix is commonly found in the Rexroth ZDR series, including variants such as ZDR10VP5-3X/315YM/12SO30 and ZDR10VP5-3X/200YMSO30.

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:

• ZDR: Sandwich Pressure Reducing Valve

• 10: Nominal Size NG10 (10 mm)

• V: Spool symbol — P-channel reducing

• P5: Configuration code

• 3X: 3X Component Series (30–39, unchanged installation and connection dimensions)

• 315: Pressure setting (315 bar) 

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

• M: Subplate mounting

• SO30: Factory internal configuration code

Technical Specifications 

• Model: ZDR10VP5-3X/315YMSO30

• Base Model: ZDR10VP5-3X/315YM

• Material Number: R900438840

• Brand: BOSCH REXROTH

• Series: ZDR Series, 3X Component Series

• Product Type: Pilot-operated Pressure Reducing Valve

• Nominal Size: NG10 (10 mm) 

• Mounting Standard: ISO 4401-05-04-0-05 / CETOP 5 / NFPA D05

• Mounting Type: Sandwich Plate Design

• Maximum Operating Pressure: 315 bar (31.5 MPa) 

• Maximum Flow Rate: 100 L/min 

• Pressure Setting: 315 bar

• Pressure Reduction Channel: P-port 

• Pilot Oil Supply: Internal 

• Pilot Oil Return: External 

• Adjustment Type: Bushing with Hexagon and Protective Cap 

• Seal Material: NBR 

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

• Weight: 2.38 kg 

• Height: 50 mm 

• Mounting Position: Any

Key Technical Advantages

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

The ZDR10VP5-3X/315YMSO30 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 operating pressure reaches 315 bar (31.5 MPa) with flow capacity up to 100 L/min.

2. Sandwich Plate Design for Compact Integration

The sandwich plate design allows direct installation between the directional valve and subplate. This eliminates additional piping, significantly simplifies hydraulic system layout, reduces potential leak points, and saves installation space. The mounting pattern conforms to ISO 4401-05-04-0-05 standards.

3. P-Port Reducing for Flexible Circuit Adaptation

This model is the P-port reducing version—pressure reduction is effected in channel P. The ZDR series also offers A-port and B-port reducing versions for flexible selection based on system requirements.

4. Internal Pilot Supply with External Y-Port Return

This valve features internal pilot oil supply with external return via Y port. The external pilot oil return ensures stable pilot control circuit performance, preventing return line back pressure from interfering with the set pressure.

5. Multiple Pressure Grades and Adjustment Types

The ZDR series offers 4 pressure grades (25, 75, 150, 210, or 315 bar). The ZDR10VP5-3X/315YMSO30 provides a setting of 315 bar. 4 adjustment types are available: rotary knob, sleeve with hexagon and protective cap, lockable rotary knob with scale, and rotary knob with scale.

6. International Standard Compliance for Global Interchangeability

Mounting conforms to ISO 4401-05-04-0-05, CETOP 5, and NFPA D05 international standards. Fully compatible with globally adopted NG10 size interfaces for direct replacement of same-series, same-specification products.

7. Pressure Gauge Connection for Easy Monitoring

The valve body features a pressure gauge connection for direct monitoring of secondary pressure, facilitating system commissioning and troubleshooting.

Application Areas

• Injection Molding Machinery — Precise secondary pressure control for injection and clamping circuits

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

• CNC Machine Tools — Precise pressure control for hydraulic clamping and unclamping

• Die-Casting Machines — Pressure staging for high-pressure casting equipment

• Industrial Automation Production Lines — Various applications requiring main system pressure reduction for sub-circuits

• General Industrial Hydraulic Systems — Various hydraulic circuits requiring precise pressure control

Expert Maintenance Tips

1. Installation Guidelines

• ZDR10VP5-3X/315YMSO30 features sandwich plate design—install between the directional valve and subplate. Pay attention to sealing and bolt length between stacked valve layers.

• Mounting surface must conform to ISO 4401-05-04-0-05 / CETOP 5 standards.

• Thoroughly clean the mounting surface and all ports (P, A, B, T) before installation to prevent foreign particles from entering and causing spool sticking or seal damage.

• Installation position: Any.

2. Hydraulic Fluid Management

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

• Seal material: NBR . For phosphate ester and other specialty fluids, select FKM seal option.

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

3. Pressure Setting Adjustment

• ZDR10VP5-3X/315YMSO30 pressure setting: 315 bar.

• Pressure adjustment is performed via the bushing with hexagon and protective cap.

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

• For adjustment types with lockable rotary knob with scale or rotary knob with scale, select corresponding configuration models.

4. 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 control spool is not sticking.

• The pressure gauge connection can be used to monitor secondary pressure for early detection of pressure abnormalities.