Bosch Rexroth | Z2S16A1-5X
Z2S16A1-5X/
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The Z2S16A1-5X/ valve belongs to the Z2S Check Valves series and is manufactured by Bosch Rexroth for hydraulic automation where one-way flow and secure load holding are required. The area ratio between control surfaces is 1/12, so a small pilot pressure can unlock the main poppet. A cracking pressure of 3 bar prevents reverse flow until the set threshold is reached. The valve tolerates a maximum operating pressure of 315 bar, enabling use in high-pressure manifolds. Leakage-free blocking is provided in channel A to keep actuators from drifting under load. It can be installed in any position, which simplifies manifold design. A built-in pre-opening feature reduces pressure shock during switching. Fluid isolation is handled by NBR seals compatible with standard hydraulic oils. The porting pattern follows ISO 4401-07-07-0-05, and fastening requires four M10 grade 10.9 screws plus two M6 grade 10.9 screws.
Flow capacity reaches 300 l/min to support large actuator circuits without excessive pressure drop, while a permitted pressure differential of 210 bar for water-glycol fluids preserves functional reliability. The cleanliness class is ISO 4406 20/18/15, so upstream filtration must keep particle counts within that range. The primed finish supplies no additional corrosion resistance, making a protected mounting location advisable. During maintenance, the plug screw should be tightened to 70 Nm to maintain internal sealing. The manifold face needs a surface roughness of Rz1max 4 to prevent external leakage paths. An MTTFd value of 150 years supports long service life in safety-related circuits.
Technical Specifications
Area Ratio (a3/a2)
1/12
Cleanliness Class
ISO 4406 20/18/15
Corrosion Resistance
None (primed)
Cracking Pressure
3 bar
Installation Position
Any
Leakage-free Blocking
Channel A
Max Pressure Differential (hfc)
210 bar
Maximum Flow
300 l/min
Maximum Operating Pressure
315 bar
Mounting Screws
4×M10 (10.9), 2×M6 (10.9)
Mttfd Value
150 years
Plug Screw Tightening Torque
70 Nm
Porting Pattern
ISO 4401-07-07-0-05
Pre-opening
Yes
Required Surface Quality
Rz1max 4
Seal Material
NBR
1620 Old Apex Road
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