Bosch Rexroth | Z2S16A1-5XV
Z2S16A1-5X/V
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The Z2S16A1-5X/V valve is produced by Bosch Rexroth within the Z2S Check Valves series and is used to secure hydraulic actuators against backflow in automated circuits. With a nominal size of 16, the unit balances compact installation with a passage area suited for medium flow duties. Its pilot-operated design permits controlled release once upstream pressure reaches the pilot threshold, while an operating limit of 315 bar supports high-pressure systems. The valve handles up to 300 l/min, so pump output is transmitted without significant restriction. A cracking pressure of 3 bar establishes the minimum differential before the poppet lifts, and the integrated pre-opening feature moderates pressure peaks during reversal. Because the assembly can be mounted in any position, machine builders gain layout freedom, and the internal layout blocks channel A leakage-free to hold loads securely when the pilot signal is absent.
Service characteristics focus on durability and maintenance. Fluorocarbon (FKM) seals resist common hydraulic oils and elevated temperatures, while the recommended fluid cleanliness level of ISO 4406 20/18/15 minimizes wear on the seating surfaces. The component is supplied without corrosion protection, so mating plates or coatings must guard exposed metal in humid environments. A mean time to dangerous failure of 150 years provides a high reliability benchmark for safety-related functions. The plug screw uses an SW41 hex profile and is tightened to 70 Nm, ensuring consistent preload on the internal spring stack. Mounting follows the ISO 4401-07-07-0-05 porting pattern, and a surface finish of Rz1 max 4 on the manifold pad ensures proper sealing without shims or gasket creep.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Corrosion Protection
None
Cracking Pressure
3 bar
Installation Position
Any
Leakage-free Blocking
Channel A
Max Flow
300 l/min
Max Operating Pressure
315 bar
Mttfd Value
150 years
Nominal Size
16
Plug Screw Size
SW41
Plug Screw Torque
70 Nm
Porting Pattern
ISO 4401-07-07-0-05
Pre-opening
With Pre-Opening
Required Surface Roughness
Rz1max 4
Seal Material
FKM
Valve Type
Pilot-Operated Check Valve
1620 Old Apex Road
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