DZ10-1-50B/210Y Rexroth Pilot Sequence Valve 210 bar 80 L/min

Product Overview

DZ10-1-50B/210Y, DZ10-1-50B/210YM, DZ20-1-5X/210Y, and DZ30-1-5X/210Y are representative models from Bosch Rexroth’s DZ series of pilot-operated pressure sequence valves, covering nominal sizes NG10, NG20, and NG30 with subplate mounting.

The DZ series pilot-operated sequence valves are used for pressure-dependent connection of secondary systems. They basically consist of a main valve (1) with main spool insert (7) and a pilot control valve (2) with adjustment type and optional check valve (3) . The operating principle is: pressure in channel A acts via the control line on the pilot spool in the pilot control valve. When the pressure in channel A exceeds the spring-set value, the pilot spool moves against the spring force, allowing fluid from the spring-loaded side of the main spool to flow out—the main spool then opens the connection from channel A to channel B.

Based on pilot oil supply and return configurations, the DZ series is classified into:

• Preload valve type (DZ…X) : Control lines 4.1, 12, 13 open; 4.2, 14, 15 closed

• Sequence valve type (DZ…X.Y) : Control lines 4.1, 12, 14 or 15 open; 4.2, 13 closed. “Y” code indicates leakage oil from the pilot spool must be directed to tank via a depressurized connection

• Circulation valve type (DZ…X.XY) : Control lines 4.2, 14 or 15 open; 4.1, 12, 13 closed

This model (DZ10-1-50B/210Y) is configured as a sequence valve type with “Y” code for external leakage oil discharge. The “M” suffix indicates an integrated optional check valve for free return flow from channel B to channel A.

As a direct replacement solution for the Bosch Rexroth DZ series, this product strictly complies with Rexroth technical standards and offers complete interchangeability—direct drop-in replacement without any modification to mounting dimensions or piping connections. Every unit undergoes 100% simulated duty cycle testing prior to shipment, ensuring performance reliability and long-term operational stability under actual working conditions.

Technical Specifications

DZ10-1-50B/210Y (R900580727)

• Model: DZ10-1-50B/210Y

• Series: DZ (Pilot-operated Pressure Sequence Valve)

• Brand: Bosch Rexroth

• Nominal Size: 10 (NG10)

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

• Mounting Type: Subplate Mounting

• Porting Pattern Standard: ISO 5781 / DIN 24340

• Maximum Operating Pressure: 315 bar

• Pressure Setting Range: Up to 210 bar

• Maximum Flow Rate: 80 L/min

• Control Type: Pilot-operated, internal pilot supply, external drain (Y-type)

• Adjustment Elements: Rotary knob / Setscrew with hexagon and protective cap / Lockable rotary knob with scale / Rotary knob with scale

• Optional Function: Without check valve (no M suffix)

• Seal Material: NBR

• Hydraulic Fluid: HL, HLP mineral-oil-based hydraulic fluids

• Fluid Temperature Range: -30 °C to +80 °C

• Viscosity Range: 10 – 800 mm²/s

• Weight: Approx. 3.4 – 3.7 kg (configuration dependent)

• Pressure Rating: 210 bar

DZ10-1-50B/210YM (R900503240)

• Model: DZ10-1-50B/210YM

• Series: DZ (Pilot-operated Pressure Sequence Valve)

• Brand: Bosch Rexroth

• Nominal Size: 10 (NG10)

• Component Series: 5X (series 50–59)

• Mounting Type: Subplate Mounting

• Porting Pattern Standard: ISO 5781 / DIN 24340

• Maximum Operating Pressure: 315 bar

• Pressure Setting Range: Up to 210 bar

• Maximum Flow Rate: 80 L/min

• Control Type: Pilot-operated, internal pilot supply, external drain (Y-type)

• Adjustment Elements: Rotary knob / Setscrew with hexagon and protective cap / Lockable rotary knob with scale / Rotary knob with scale

• Optional Function: With check valve (M suffix)

• Seal Material: NBR

• Hydraulic Fluid: HL, HLP mineral-oil-based hydraulic fluids

• Fluid Temperature Range: -30 °C to +80 °C

• Viscosity Range: 10 – 800 mm²/s

• Weight: Approx. 3.4 – 3.7 kg (configuration dependent)

• Pressure Rating: 210 bar

DZ20-1-5X/210Y

• Model: DZ20-1-5X/210Y

• Series: DZ (Pilot-operated Pressure Sequence Valve)

• Brand: Bosch Rexroth

• Nominal Size: 20 (NG20)

• Component Series: 5X (series 50–59)

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 315 bar

• Maximum Flow Rate: 400 L/min

• Control Type: Pilot-operated, Y-type external drain

• Weight: Approx. 5.2 – 5.3 kg

DZ30-1-5X/210Y

• Model: DZ30-1-5X/210Y

• Series: DZ (Pilot-operated Pressure Sequence Valve)

• Brand: Bosch Rexroth

• Nominal Size: 30 (NG30)

• Component Series: 5X (series 50–59)

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 315 bar

• Maximum Flow Rate: 600 L/min

• Control Type: Pilot-operated, Y-type external drain

Key Technical Advantages

1. Pilot-Operated Design – High Flow & High Accuracy
The DZ series features a pilot-operated design where the pilot valve precisely controls the main spool cracking pressure. Compared to direct-operated sequence valves, the pilot-operated design maintains excellent regulation accuracy and minimal pressure overshoot even under high-flow conditions. The DZ30 delivers up to 600 L/min in the NG30 envelope, meeting the demands of large hydraulic systems.

2. Three Valve Functions – Flexible Application Adaptation
The DZ series can be configured as preload valves (DZ…X), sequence valves (DZ…X.Y), or circulation valves (DZ…X.XY). The sequence valve type (Y-type) directs pilot spool leakage oil to tank via an external depressurized connection, preventing back pressure interference with the set pressure—particularly suitable for high-precision control applications.

3. Optional Check Valve – Free Return Flow
The “M” suffix models include an optional check valve, allowing oil to flow freely from the secondary circuit (channel B) back to the primary circuit (channel A) without overcoming the sequence valve setting. This is especially important when secondary circuit pressure exceeds primary circuit pressure, preventing abnormal system pressure rise.

4. Optimized Control Oil Routing & Leakage Management
Leakage oil from the pilot spool is directed to tank via control lines (14 or 15) , ensuring leakage oil is unaffected by back pressure. Simultaneously, oil flow from the main spool spring chamber is precisely controlled via nozzle (6) , delivering smooth main spool opening characteristics and excellent dynamic response.

5. Four Adjustment Elements – Versatile Operating Options
The DZ series offers four adjustment element options: rotary knob, setscrew with hexagon and protective cap, lockable rotary knob with scale, and rotary knob with scale. Users can select the most appropriate adjustment type based on anti-tamper requirements, setting accuracy needs, and on-site operating preferences. Knobs with scale enable precise setting and repeatable adjustment.

6. Broad Pressure Ratings & Size Coverage
The DZ series covers NG10, NG20, and NG30 nominal sizes, with flow rates ranging from 80 L/min to 600 L/min and pressure ratings including 25 bar, 75 bar, 150 bar, 210 bar, and 315 bar. The extensive selection enables adaptation to hydraulic systems ranging from small machine tools to large metallurgical equipment.

Application Areas

• Sequence Motion Control: Automatic secondary circuit switching in hydraulic systems requiring multiple actuators to operate in pressure sequence

• Preload Valve Applications: Providing preset back pressure or preload pressure for hydraulic systems

• Circulation Valve Applications: Circuit switching and circulation control in systems requiring external signal control

• Injection Molding Machinery: Sequential switching control for multi-stage injection pressures

• Hydraulic Presses & Die-Casting: Sequential motion control for slides, ejector cylinders, and other actuators

• Mobile Machinery: Sequential control and pressure switching for implement functions

• Metallurgical Equipment: Sequence control and pressure switching in rolling mill hydraulic systems

• Marine & Offshore: Sequence control and pressure-dependent switching in hydraulic systems

Expert Maintenance Tips

1. Mounting Surface Verification
DZ series sequence valves conform to ISO 5781 or DIN 24340 standards. Thoroughly clean the mounting surface prior to installation and inspect O-ring seals—replace after every disassembly.

2. Installation Torque
Tighten mounting bolts in diagonal sequence over multiple passes to torque values specified in Rexroth technical documentation. Torque requirements vary by nominal size—refer to the respective technical data for NG10, NG20, and NG30.

3. Port Y (Drain Port) Connection Requirements
For Y-type (sequence valve) configurations, leakage oil from the pilot spool must be directed to tank via an external depressurized connection. The Port Y line should be independently returned to tank and must not be并联 with return lines from other valves to prevent back pressure interference with the set pressure. Excessive Port Y back pressure will cause setpoint drift.

4. Pressure Setting Procedure
To adjust pressure: turn the adjustment element clockwise to increase set pressure, counterclockwise to decrease. Final calibration should be performed under actual system operating flow and temperature conditions and verified 2–3 times to ensure accuracy. Lock the lock nut (if applicable) after adjustment.

5. Hydraulic Fluid Cleanliness Control
The DZ series features精密 clearances between the spool and body, making it sensitive to fluid contamination. Maintain system fluid cleanliness at ISO 4406 16/13 (or NAS 1638 Class 8) or better, with a filter of no less than 10 μm upstream.

6. Scheduled Maintenance
Perform preventive maintenance every 2,000 operating hours or every six months:

• Verify sequence actuation pressure matches the set value

• Check Port Y drain line for blockage or abnormal back pressure

• Check for abnormal leakage or pressure drift

• Inspect adjustment mechanism for smooth operation

• Inspect O-ring seals for aging, hardening, or damage (replace after every disassembly)

• Verify check valve (if “M” model) opens and closes correctly