Bosch Rexroth | ZDR6DP7-4X25YM
ZDR6DP7-4X/25YM
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The ZDR6DP7-4X/25YM is manufactured by Bosch Rexroth for the ZDR Pressure Reducing Valves series. It maintains a controlled downstream pressure in hydraulic automation circuits. The valve follows size 6, giving it port dimensions compatible with compact manifolds. Pressure reduction is applied in port P, allowing a dedicated line for stabilized output. The secondary side can be set up to 25 bar, which suits pilot stages and low-pressure branches. An inlet rating of 350 bar permits installation on high-pressure mains without separate isolation. Counter pressure in port T(y) may reach 160 bar, so the design tolerates back pressure from return lines. Flow capacity is 50 l/min, enabling steady supply to moderate-demand actuators. Pilot oil is fed internally, simplifying external plumbing, while the return line for pilot oil is routed externally to prevent interaction with tank pressure.
Adjustment is carried out by a rotary knob with a scale so technicians can set pressure with repeatability. The design omits a check valve, therefore reverse flow must be managed elsewhere in the system. Port interfaces match the ISO 4401-03-02-0-05 pattern, and four M5 ISO 4762-10.9 screws fasten the body to the manifold. A G1/4 pressure gauge port is available for direct measurement of the regulated line. NBR seals provide compatibility with common hydraulic oils. The valve should be used with fluid cleanliness not worse than ISO 4406 class 20/18/15 to limit internal wear. No locating hole is present, so positioning is determined solely by the mounting hardware. These details support dependable operation when precise pressure regulation is required.
Technical Specifications
Adjustment Type
Rotary Knob With Scale
Check Valve
None
Cleanliness Class
ISO 4406 20/18/15
Locating Hole
None
Max Counter Pressure Port T(y)
160 bar
Max Flow
50 l/min
Max Operating Pressure (input)
350 bar
Mounting Screws
4x M5 ISO 4762-10.9
Pilot Oil Return
External
Pilot Oil Supply
Internal
Porting Pattern
ISO 4401-03-02-0-05
Pressure Gauge Port
G1/4
Pressure Reduction Port
P
Seal Material
NBR
Secondary Pressure Max
25 bar
Size
6
1620 Old Apex Road
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