Bosch Rexroth | ZDB6VP3-4X315V
ZDB6VP3-4X/315V
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The ZDB6VP3-4X/315V is a pilot-operated relief valve produced by Bosch Rexroth within the ZDB Pressure Relief Valves series. It limits system pressure in hydraulic automation circuits by diverting flow from P to T once the set threshold is reached. The valve is built in size 6 and uses a sandwich plate connection that matches porting pattern ISO 4401-03-02-0-05, enabling direct stacking between subplates and directional valves. Its relief function acts between pressure port P and tank port T, and the pilot oil drains externally to T to prevent back-pressure influence on the setting. The unit supports a maximum operating pressure of 315 bar and is factory rated to relieve at 315 bar, while accommodating flows up to 60 l/min without excessive pressure rise.
The model employs a lockable rotary knob with a scale so technicians can adjust pressure accurately and secure the setting after commissioning. An FKM seal package withstands mineral oils and higher temperatures, and the cleanliness class requirement of 20/18/15 (ISO 4406) ensures reliable pilot operation by minimizing contamination. Installation can be in any orientation, and the design tolerates counter-pressure up to 40 bar on the tank line. Correct assembly calls for a hexagon tightening torque of 50 Nm on the adjustment element and 8.1 Nm on the mounting screws to maintain leak-free joints. These mechanical and fluid cleanliness specifications sustain consistent relief behavior throughout service life.
Technical Specifications
Adjustment Type
Lockable Rotary Knob With Scale
Cleanliness Class
20/18/15 (ISO 4406)
Hexagon Tightening Torque
50 Nm
Installation Position
Any
Maximum Counter Pressure
40 bar
Maximum Flow
60 l/min
Maximum Operating Pressure
315 bar
Mounting Screw Torque
8.1 Nm
Pilot Oil Drain
External To T
Porting Pattern
ISO 4401-03-02-0-05
Relief Function
P–T
Seal Material
FKM
Set Pressure Rating
315 bar
Size
6
Type Of Connection
Sandwich Plate Valve
Valve Type
Pilot-Operated Relief Valve
1620 Old Apex Road
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