Rexroth ZDB6 ZDB10 Z2DB Series Sandwich Relief Valve | ZDB10VP ZDB6VP | Modular Pressure Control

Chengyuan Hydraulic offers high-performance ZDB and Z2DB series sandwich plate relief valves, precision-engineered to meet the rigorous standards of Rexroth. This series features pilot-operated designs in both single (ZDB) and double (Z2DB) configurations, with core models including ZDB6VP-1-40B/315 and ZDB10VP-1-40B/100. Designed for modular hydraulic systems, Chengyuan ensures 100% Drop-in Interchangeability regarding mounting dimensions (ISO 4401-03/05 compliant) and port layouts. Backed by our 100% Simulation Load Testing, each valve is rigorously verified for pressure stability and internal leakage. This guarantees precise pressure regulation and rapid response times even at continuous 315 bar operating pressures.

Technical Specifications

• Series Category: ZDB6 (Size 6), ZDB10 (Size 10)

• Valve Design: Pilot-operated sandwich plate relief valve

• Max Operating Pressure: 315 bar (31.5 MPa)

• Pressure Settings: 50 bar, 100 bar, 200 bar, 315 bar (Models 50/100/200/315)

• Max Flow Rate: Up to 60 L/min for ZDB6; Up to 100 L/min for ZDB10

• Pressure Limitation In Ports: VP (Port P), VA (Port A), VB (Port B), VC, VD, etc.

• Adjustment Element: Hexagon screw with protective cap (Code 1), handwheel optional

• Seal Materials: NBR (Buna-N) or FKM (Viton)

• Fluid Temp Range: -30°C to +80°C

Key Technical Advantages:

• Precision Pilot Seat Processing: The pilot cone is high-frequency quenched and precision-ground, ensuring extremely stable cracking pressure and low hysteresis. It maintains excellent linearity and repeatability even under frequent relief cycles.

• High-Quality Cast Body: The housing is cast from high-strength ductile iron with optimized internal galleries. This design increases flow capacity and significantly reduces pressure drop and heat generation during operation.

• Total Interchangeability: Fully compliant with ISO 4401 international standards. The stack height and bolt patterns are identical to Rexroth originals, allowing users to replace existing parts without any plumbing modifications.

• Superior Noise Reduction: Internal damping orifices are fluid-dynamically optimized to suppress hydraulic whistling and resonance during relief, enhancing the overall quietness and stability of the system.

Application Areas:

• Industrial Machine Tools: Multi-stage pressure protection and safety relief for hydraulic drives.

• Plastics Machinery: Precision pressure tuning for clamping and ejection systems in injection molding machines.

• Mobile Equipment: Pressure limitation for outrigger circuits in construction machinery and crane locking systems.

• Modular Power Units: Stack-mounted pressure modules in custom hydraulic stations for simplified circuit design.

Expert Maintenance Tips:

• Pressure Tuning: Adjust pressure gradually. If setting to maximum, ensure the main system safety valve is set 20-30 bar higher than the sandwich valve.

• Seal Integrity: Inspect O-rings on the mounting surface before assembly. Ensure uniform bolt torque (11 Nm for Size 6; 15.5 Nm for Size 10) to maintain an airtight seal in the stack.

• Filtration Management: While robust, these pilot valves benefit from filtration finer than 25μm to prevent pilot orifice blockage, which could cause failure to unload or set-point drift.