Bosch Rexroth | ZDR6DA2-4X25Y12
ZDR6DA2-4X/25Y/12
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The ZDR6DA2-4X/25Y/12 pressure reducing valve belongs to the ZDR Pressure Reducing Valves series from Bosch Rexroth and limits pressure in hydraulic automation circuits. It is built in size 6, which matches ISO 03 sandwich manifolds and keeps the assembly compact. The sandwich plate connection lets the valve stack between directional valves without extra piping, and the ISO 4401-03-02-0-05 porting pattern maintains standard manifold drilling. Port threads are UNF and the required mounting screws are UNC, so common North American hardware fits directly. The unit tolerates a primary operating pressure of 315 bar while holding the secondary line at up to 25 bar. Pressure is reduced in channel A, allowing separate control of that flow path. Pilot oil is taken internally and returned externally to improve response accuracy, and a built-in check valve provides free reverse flow so downstream components can exhaust without pressure rise.
Pressure is set with a sleeve that has a hexagon head under a protective cap, allowing secure adjustment during commissioning. The valve handles up to 50 L/min, supporting medium-flow circuits in machine tools and presses. Counterpressure at port T can reach 160 bar without affecting stability, ensuring reliable tank back-pressure handling in regenerative systems. Clean hydraulic fluid to ISO 4406 class 20/18/15 is required to protect the throttling edges and pilot stage. Sealing elements are NBR, making the unit suitable for mineral-oil media within standard temperature ranges. These design limits define the operating envelope for compact manifold assemblies where precise secondary pressure control is needed.
Technical Specifications
Adjustment Type
Sleeve With Hexagon (Protective Cap)
Check Valve
Yes
Connection Type
Sandwich Plate
Fluid Cleanliness
20/18/15 (ISO 4406)
Max Flow
50 L/min
Max Operating Pressure
315 bar
Mounting Screws
UNC
Pilot Oil
Internal Supply/External Return
Port T(y) Counterpressure (max)
160 bar
Port Threads
UNF
Porting Pattern
ISO 4401-03-02-0-05
Pressure Reduction Channel
A
Seal Material
NBR
Secondary Pressure (max)
25 bar
Size
6
1620 Old Apex Road
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