Bosch Rexroth | ZDB6VA2-4X100V-SO2
ZDB6VA2-4X/100V SO2
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The ZDB6VA2-4X/100V SO2 valve belongs to the ZDB Pressure Relief Valves series produced by Bosch Rexroth for hydraulic automation circuits that require controlled pressure limitation. As a pilot-operated pressure relief unit, it maintains upstream pressure while diverting excess oil to tank when the set limit is exceeded. The A–T relief function routes the relieved flow from port A directly to the tank path, preventing overload in actuator lines. With a nominal size of 6, the valve fits compact sandwich stacks where minimal footprint is important. Its sandwich plate body follows the ISO 4401-03-02-0-05 porting pattern, allowing direct mounting between subplates without extra piping. The design tolerates a maximum operating pressure of 315 bar so it can be installed in high-pressure power units. Users can limit system pressure to 100 bar by adjusting the sleeve with hexagon and protective cap, which provides safe and repeatable setting.
The valve passes up to 60 l/min, ensuring adequate flow for medium-size actuators without excessive pressure drop. A counter pressure of up to 40 bar on the tank line can be tolerated, so remote drains or back-pressure accumulators do not impair relief accuracy. Pilot oil returns externally via port T, isolating the pilot stage from fluctuating main line pressures. FKM seals are used to resist common hydraulic oils and maintain elasticity at elevated temperatures. Both fluid and ambient temperatures may reach 80 °C, which supports installation near heat-generating machinery. Cleanliness class ISO 4406 20/18/15 is required to avoid pilot orifice blockage and maintain stable cracking behavior. Together, these characteristics allow the valve to protect circuits while fitting neatly into standardized stack manifolds.
Technical Specifications
Adjustment Type
Sleeve With Hexagon And Protective Cap
Cleanliness Class
ISO 4406 20/18/15
Connection Type
Sandwich Plate Valve
Max Ambient Temperature
80 °C (FKM)
Max Fluid Temperature
80 °C (FKM)
Maximum Counter Pressure
40 bar
Maximum Flow
60 l/min
Maximum Operating Pressure
315 bar
Maximum Set Pressure
100 bar
Nominal Size
6
Pilot Oil Drain
External Via T
Porting Pattern
ISO 4401-03-02-0-05
Relief Function
A–T
Seal Material
FKM
Valve Type
Pilot-Operated Pressure Relief
1620 Old Apex Road
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