Bosch Rexroth | Z1S6B05-4XV
Z1S6B05-4X/V
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The Z1S6B05-4X/V check valve belongs to the Z1S Check Valves series from Bosch Rexroth and is intended to block reverse flow in hydraulic automation manifolds. It opens at a cracking pressure of 0.5 bar so low back-pressure circuits can start with minimal losses. Flow is permitted from port B2 to port B1, allowing designers to predict directional behavior inside stack modules. The component sustains a maximum operating pressure of 350 bar and passes up to 40 l/min so medium-size actuators remain adequately supplied. Ambient and fluid temperatures can range from −20 °C to +80 °C, which allows outdoor or warmed oil service without performance drift. Any installation position is acceptable, simplifying manifold layout and reducing orientation constraints.
Fluid cleanliness must conform to ISO 4406 code 20/18/15 so the poppet seat maintains tight shut-off over time. Permissible viscosity spans from 2.8 mm²/s to 500 mm²/s, letting the valve operate with thin startup oils or heavy-grade fluids at high load. Sealing is achieved with FKM material, giving compatibility with standard mineral oils and many synthetic blends. The porting pattern follows ISO 4401-03-02-0-05, and the mounting interface matches NFPA T3.5.1 R2-2002 D03 to fit directly into sub-plates of the same size. M5 screws per ISO 4762-10.9 secure the body to the stack and provide the clamp load needed at full pressure. These mechanical details support rapid assembly and permit the valve to be swapped without reworking the manifold.
Technical Specifications
Ambient Temperature Max
+80 °C
Ambient Temperature Min
−20 °C
Cleanliness Class
ISO 4406 20/18/15
Cracking Pressure
0.5 bar
Direction Of Flow
B2 → B1
Fluid Temperature Max
+80 °C
Fluid Temperature Min
−20 °C
Installation Position
Any
Maximum Flow
40 l/min
Maximum Operating Pressure
350 bar
Mounting Interface
NFPA T3.5.1 R2-2002 D03
Mounting Screws
M5 (ISO 4762-10.9)
Porting Pattern
ISO 4401-03-02-0-05
Seal Material
FKM
Viscosity Max
500 mm²/s
Viscosity Min
2.8 mm²/s
1620 Old Apex Road
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