Bosch Rexroth | ZDB6VP3-4X315
ZDB6VP3-4X/315
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The ZDB6VP3-4X/315 pressure relief valve belongs to the ZDB Pressure Relief Valves series and is manufactured by Bosch Rexroth for hydraulic automation circuits that need stable pressure limitation. It is built in size 6 and mounts as a sandwich plate valve, following the ISO 4401-03-02-0-05 porting pattern to stack easily under directional valves. The relief path runs from port P to T, and pilot oil is discharged externally through port T to avoid back-pressure interference. Pressure is set with a lockable rotary knob that includes a scale, allowing repeatable adjustments without unintentional change. The valve can be installed in any position, which simplifies layout inside compact manifolds.
The unit handles operating pressures up to 315 bar while permitting flows to 60 l/min, so it covers medium-duty pump outputs in mobile and industrial equipment. Counter pressure at port T may rise to 40 bar without affecting the setting, widening application scope where return lines carry backpressure. Nitrile rubber seals are fitted, and both the hydraulic fluid and the surrounding air may range from –20 °C to 80 °C, matching common mineral oil systems. Acceptable oil cleanliness is 20/18/15 per ISO 4406 (c), which protects the internal spool from scoring. These limits ensure consistent relief performance within the specified envelope.
Technical Specifications
Adjustment Type
Lockable Rotary Knob With Scale
Ambient Temperature Max
80 °C (NBR)
Ambient Temperature Min
-20 °C (NBR)
Cleanliness Class
20/18/15 (ISO 4406 (c))
Connection Type
Sandwich Plate Valve
Hydraulic Fluid Temp Max
80 °C (NBR)
Hydraulic Fluid Temp Min
-20 °C (NBR)
Installation Position
Any
Maximum Counter Pressure
40 bar
Maximum Flow
60 l/min
Maximum Operating Pressure
315 bar
Pilot Oil Drain
External Via Port T
Porting Pattern
ISO 4401-03-02-0-05
Relief Function
P–T
Seal Material
NBR
Size
6
1620 Old Apex Road
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