Bosch Rexroth | Z2DB6VD2-4X50V
Z2DB6VD2-4X/50V
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The Z2DB6VD2-4X/50V valve belongs to the ZDB Pressure Relief Valves series manufactured by Bosch Rexroth for hydraulic automation circuits. It is a pilot-operated pressure relief design so upstream pressure is sensed and vented through a pilot stage before the main poppet opens. Nominal size 6 permits mounting in compact manifolds while still allowing the required flow path. The ISO 4401-03-02-0-05 porting pattern aligns the body with standard subplates to simplify installation. Its relief function works in directions A–B and B–A, providing bidirectional protection for dual-acting actuators. The valve can be adjusted up to a maximum set pressure of 50 bar, enabling fine tuning of circuit limit values. It withstands a maximum operating pressure of 315 bar without structural damage, ensuring safety in high-pressure lines. A sleeve with hex under a protective cap represents adjustment type 2, allowing secure pressure setting while guarding against accidental tampering. Counter pressure up to 40 bar on the return line can be tolerated without affecting opening characteristics.
The valve supports a peak flow of 60 l/min so it can relieve medium-capacity circuits without excessive pressure rise. Operation is specified between ambient temperatures of −15 °C and +80 °C when FKM seals are used, allowing service in typical plant environments. Fluid temperature may also vary from −15 °C to +80 °C, matching the seal rating and preventing thermal damage. Viscosity limits from 10 mm²/s to 800 mm²/s define the acceptable fluid thickness range for stable pilot response. Oil cleanliness must reach ISO 4406 (c) 20/18/15 to prevent erosion and maintain reliable seating of the poppet. These operating boundaries ensure the Z2DB6VD2-4X/50V maintains consistent relief performance across varied duty cycles in mobile or industrial hydraulic systems.
Technical Specifications
Adjustment Type
2 (Sleeve, Hex, Protective Cap)
Cleanliness Class
ISO 4406 (c) 20/18/15
Max Ambient Temperature (fkm)
+80 °C
Max Fluid Temperature (fkm)
+80 °C
Maximum Counter Pressure
40 bar
Maximum Flow
60 l/min
Maximum Operating Pressure
315 bar
Maximum Set Pressure
50 bar
Maximum Viscosity
800 mm²/s
Min Ambient Temperature (fkm)
−15 °C
Min Fluid Temperature (fkm)
−15 °C
Minimum Viscosity
10 mm²/s
Nominal Size
6
Porting Pattern
ISO 4401-03-02-0-05
Relief Function
A–B and B–A
Valve Type
Pilot-Operated Pressure Relief
1620 Old Apex Road
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