Rexroth ZDB6 Series Sandwich Relief Valve | ZDB6VP1 ZDB6VP2 | 315 bar

The ZDB6 Series sandwich plate relief valves by Chengyuan Hydraulic are pilot-operated pressure control units fully compatible with Rexroth 4X series engineering standards. This range (including ZDB6VP1, ZDB6VP2) is specifically designed to limit system pressure within a compact footprint. The sandwich plate design allows for direct mounting between a directional valve and a subplate, eliminating the need for extra piping. We utilize precision-lapped spools and fatigue-resistant springs to ensure minimal pressure override even at 31.5 MPa. Offering 100% original-place interchangeability and having passed 100% simulated condition testing, these valves are the premier solution for space-critical industrial hydraulic power units.

Technical Specifications :

• Model Code Examples: ZDB6VP1-4X/315V, ZDB6VP2-42/50V, ZDB6VP7-4X/100V

• Nominal Size: Size 6 (ISO 4401-03)

• Max Operating Pressure: $31.5\text{ MPa (315 bar / 4570 psi)}$

• Max Flow Rate: Up to $60\text{ L/min (15.8 gpm)}$

• Pressure Adjustment Ranges: 50 bar, 100 bar, 200 bar, 315 bar

• Adjustment Types: Rotary knob, Hexagon screw with cap, or lockable knob

• Seal Material: V for FKM (Viton) as standard, suitable for diverse fluid media

• Mounting Pattern: ISO 4401-03-02-0-05 (Sandwich mounting)

Key Technical Advantages:

• Modular Sandwich Construction: The ZDB6 body is machined from high-strength castings with port patterns matching international standards. Users can easily upgrade system functionality or pressure protection by adding valves to the stack without altering existing pipework.

• Smooth Pilot-Operated Relief: Compared to direct-acting valves, the pilot-operated design of the ZDB6 provides a flatter pressure-flow characteristic. This significantly reduces hydraulic shock (water hammer) during pressure relief, protecting the pump and actuators.

• High-Pressure Stability: The spool and seat are nitrided for extreme hardness and erosion resistance. Even under frequent cycling at 315 bar, the set-pressure drift is negligible, ensuring long-term system safety.

• Flexible Logic Configurations: Available in VP (P-port relief), VA (A-port), VB (B-port), and combined VC/VD configurations. This flexibility allows designers to resolve complex circuit protection requirements using a single stacking module.

Application Areas:

• Machine Tools: Secondary pressure control in vertical stack hydraulic power units.

• Plastic Machinery: Overpressure protection for auxiliary circuits in injection molding machines.

• Forming Equipment: Branch circuit pressure regulation within complex press control blocks.

Expert Maintenance Tips:

• Adjustment Logic: Turning the adjustment bolt clockwise increases pressure; counter-clockwise decreases it. Always use a pressure gauge for real-time monitoring during calibration.

• O-Ring Integrity: During stacking, ensure the seal grooves are clean and smooth. Damaged O-rings are the primary cause of static leakage between the sandwich layers.

• Bolt Torque: Fastening bolts for the valve stack should be tightened symmetrically. Due to the length of bolts in multi-layer stacks, use grade 10.9 or higher high-tensile bolts to prevent interlayer leakage caused by bolt stretching.