Overview
The Rexroth Z2S 10-1-33/V (part number A136-276, serial 00407439) is a pilot-operated check valve manufactured by Bosch Rexroth for industrial and mobile hydraulic systems. This sandwich plate design provides secure, leakage-free blocking of selected actuator ports—even during extended idle periods—while allowing controlled release through pilot pressure signals. The “V” designation indicates FKM seals, making this unit compatible with synthetic hydraulic fluids including phosphate ester and polyol ester oils.
Key Features
- Pilot-operated design: Two-stage structure with spring-loaded poppet and spool control for enhanced performance and safe unloading at lower pilot pressures
- Sandwich plate construction: Compact vertical stacking format (CETOP 05 mounting pattern) eliminates need for separate piping or manifold blocks
- Leakage-free blocking: Provides line contact closure on one or two actuator ports simultaneously
- Low pilot pressure requirement: Typically 1.5–10 bar at pilot port for full opening, allowing integration with existing control circuits
- Corrosion-protected body: Cast iron or steel with surface treatment suitable for industrial and mobile equipment environments
- FKM seals (V-designation): Rated for mineral-based and synthetic hydraulic fluids
Technical Specifications
- Maximum working pressure: 315 bar
- Maximum flow rate: 120 l/min
- Cracking pressure (Z2S 10-1-33): 6 bar
- Porting pattern: ISO 4401 CETOP-05-04-0-05
- Mounting orientation: Vertical stacking (sandwich plate)
- Seal material: FKM (Viton)
- Main body material: Cast iron or steel
- Dimensions (approx.): 162 mm length × 57 mm height
- Weight: 2.8–3.2 kg depending on variant
- Operating temperature range: Depends on hydraulic fluid type; typical −10°C to +60°C
- Fluid compatibility: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR
- Minimum fluid cleanliness: ISO 4406 20/18/15 or NAS 1638 Class 9
Typical Applications
- Hydraulic presses: Prevents ram drift and maintains position holding during multi-step forming operations
- Material handling equipment: Provides load-holding safety in forklifts and lifting tables
- Mobile machinery: Controls actuator lockout on excavators, dump trucks, and cranes
- Industrial actuator control: Isolates and blocks single or dual actuator ports in compact manifold assemblies
- Machine tool clamping: Maintains repeatable workpiece positioning without pressure creep
Compatibility & Replacements
Compatible With
- CETOP-05 (ISO 4401-05) sandwich plate stacking systems
- Bosch Rexroth hydraulic control blocks and manifolds
- Standard industrial and mobile hydraulic circuits using mineral and synthetic fluids
- Pilot pressure supplies ranging 1.5–10 bar (depending on main system pressure)
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The Z2S 10-1-33/V directly replaces equivalent Rexroth Z2S Size 10 pilot check valves with the same cracking pressure (6 bar) and FKM seals. Alternative part numbers in the Z2S 10 series include Z2S 10-1-32/V (3 bar), Z2S 10-1-34/V (10 bar), and non-V variants with NBR seals for mineral oils only.
Works With
- Bosch Rexroth Hydraulics design software and CAD libraries
- Standard ISO 4401 porting and CETOP-05 manifold systems
- Pilot control valves and proportional directional control valves (as pilot signal source)
- Hydraulic fluid monitoring and condition analysis programs
