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Bosch Rexroth | ZDR6DP1-4X75YM12

ZDR6DP1-4X/75YM/12

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The ZDR6DP1-4X/75YM/12 valve belongs to the ZDR Pressure Reducing Valves series from Bosch Rexroth and is used in hydraulic automation to keep downstream pressure constant while the supply side remains higher. It fits Cetop size D03 manifolds and follows the ISO 4401-03-02-0-05 mounting pattern, allowing installation as a sandwich plate between other sub-plates. The nominal size is 6, and pressure is reduced in port P, flowing from P2 to P1 toward sensitive actuators. An internal pilot oil supply senses the controlled side, while pilot oil returns externally to avoid internal back-pressure. Pressure is adjusted with a type 1 rotary knob and can be set up to the 75 bar pressure stage. A gauge port with SAE threads is included for direct monitoring during commissioning.

This direct-operated pressure reducing valve tolerates inlet pressures up to 350 bar and passes flow rates as high as 50 l/min without stability loss. Back pressure in port T is allowed up to 160 bar, making the valve suitable for circuits with elevated tank lines. No check valve is integrated, so reverse flow must be handled by other components. NBR seals provide compatibility with common hydraulic oils and maintain leakage control across the stated range. The specified maximum pressure, defined back-pressure capability, absence of a check element, and stated flow capacity set the operational envelope for this sandwich plate in high-duty hydraulic machinery.

Technical Specifications

Adjustment Type
Rotary Knob (Type 1)

Back Pressure Port T(y)
160 bar

Cetop Size
D03

Check Valve
None

Gauge Port Connection
SAE Threads

Max Flow
50 l/min

Max Operating Pressure
350 bar

Mounting Pattern
ISO 4401-03-02-0-05

Mounting Type
Sandwich Plate

Nominal Size
6

Pilot Oil Return
External

Pilot Oil Supply
Internal

Pressure Reduction Port
P (P2->P1)

Pressure Stage
75 bar

Seal Material
NBR

Valve Type
Pressure Reducing (Direct Operated)

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