Bosch Rexroth | ZDR6DPO-4540YMVW80
ZDR6DPO-45/40YMVW80
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The ZDR6DPO-45/40YMVW80 pressure reducing valve is produced by Bosch Rexroth within the ZDR Pressure Reducing Valves series. It moderates inlet pressure to a stable level for hydraulic actuators located in channel P. The nominal size 6 mounting interface limits the envelope and defines a flow capacity suited to compact manifolds. An ISO 4401-03-02-0-05 porting pattern allows direct stacking with standard subplates, avoiding additional adapters. Internal pilot oil supply eliminates separate pilot lines, while the pilot oil returns externally so drain flow does not recirculate into the control chamber. A dedicated G1/4 pressure-gauge port lets technicians verify secondary pressure without extra fittings. The valve tolerates inlet pressures up to 350 bar, yet it caps secondary pressure at 315 bar to protect sensitive circuits. Return-line counterpressures up to 160 bar are permitted, preventing malfunction where backpressure is unavoidable.
The assembly passes a maximum flow rate of 50 l/min, matching the orifice design and ensuring stable regulation without chatter at typical system volumes. Ambient temperatures may range from −20 °C to +80 °C, so the housing and springs remain functional in unheated machinery rooms or warm engine bays. The same −20 °C to +80 °C window applies to hydraulic fluid, allowing seals and clearances to accommodate viscosity changes without leakage. FKM sealing material resists heat and mineral-oil additives, extending service intervals under demanding thermal cycles. The 1.2 kg mass simplifies manifold installation because a single technician can position the valve without lifting aids, and the lightweight profile reduces stress on gasket surfaces. With flow constrained to its rated value, pressure build-up stays linear, providing predictable behavior for servo loops during extended duty cycles.
Technical Specifications
Max Ambient Temperature
+80 °C
Max Counterpressure T(y)
160 bar
Max Flow Rate
50 l/min
Max Fluid Temperature
+80 °C
Max Operating Pressure
350 bar
Max Secondary Pressure
315 bar
Min Ambient Temperature
−20 °C
Min Fluid Temperature
−20 °C
Nominal Size
6 (NG6)
Pilot Oil Return
External
Pilot Oil Supply
Internal
Porting Pattern
ISO 4401-03-02-0-05
Pressure Gauge Port
G1/4
Pressure Reduction Channel
P
Seal Material
FKM (V)
Weight
1.2 kg
1620 Old Apex Road
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