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The ZDR6DB2-4X/150YMV pressure reducing valve is built by Bosch Rexroth and belongs to the ZDR Pressure Reducing Valves series. It is applied in hydraulic automation to regulate pressure in channel P so downstream actuators receive a stable value even if the inlet varies. The valve mounts as a sandwich plate and conforms to the ISO 4401-03-02-0-05 porting pattern, allowing direct stacking between other size 6 elements. Internal pilot oil supply simplifies piping, while an external pilot oil return prevents back-pressure from influencing the control spring. The housing can withstand a maximum operating pressure of 350 bar, and the secondary circuit is limited to 150 bar to protect sensitive components.
Pressure setting is carried out through a hex sleeve with a protective cap that guards against accidental adjustment. The design omits a check valve, so reverse flow must be handled by external circuitry. FKM seals provide compatibility with mineral oils and elevated temperatures. The required fluid cleanliness is ISO 4406 class 20/18/15 to prevent spool wear. The valve handles up to 50 l/min, matching medium flow service lines. The counter pressure at port T is limited to 160 bar, ensuring the drain path does not disturb regulation. Pilot extraction is taken from port B which keeps the control line separate from the main flow. There is no locating hole in the body, so plate alignment depends on the mounting bolts.
Adjustment Type
Hex Sleeve With Protective Cap
Check Valve
None
Cleanliness Class
ISO 4406 20/18/15
Counter Pressure Max At T(y)
160 bar
Locating Hole
No
Max Flow
50 l/min
Max Operating Pressure
350 bar
Mounting
Sandwich Plate
Nominal Size
6
Pilot Extraction Channel
B
Pilot Oil Return
External
Pilot Oil Supply
Internal
Porting Pattern
ISO 4401-03-02-0-05
Pressure Reduction Channel
P
Seal Material
FKM
Secondary Pressure Limit
150 bar
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