Rexroth Pilot-Operated Check Valve in a sandwich plate design. These are commonly used in industrial hydraulics to provide "leak-free" blocking of actuator ports (like a cylinder) to hold a load in place.
Below are the technical details for this specific unit:
Identification
Model Number: Z2S6-1-64/
Material Number: R900347495
Manufacturer: Rexroth Hydraulics (Bosch Rexroth)
Size (NG): 6 (standard interface for modular stacking)
Technical Specifications
| Feature | Specification |
| Max Operating Pressure | 315 bar (approx. 4,500 psi) |
| Max Flow Rate | 60 L/min |
| Cracking Pressure | 1.5 bar (indicated by the -1- in the code) |
| Seals | NBR (Standard Nitrile) |
| Weight | Approx. 0.8 kg to 0.96 kg |
| Mounting Pattern | ISO 4401-03-02-0-05 (CETOP 3 / NG6) |
Symbol & Function
The diagram on the nameplate indicates that this is a double pilot-operated check valve (blocking in both channels A and B).
Free Flow: Oil flows freely from the valve side to the actuator side (A → A and B → B).
Blocked Flow: Flow is blocked in the opposite direction (A ← A and B ← B) to lock the actuator position.
Pilot Opening: When pressure is applied to one side (e.g., side A), the internal spool shifts to mechanically push open the check valve on the opposite side (side B), allowing return flow.
Common Applications
Preventing a hydraulic cylinder from "creeping" or falling due to internal valve leakage.
Safety locking of hydraulic loads during power failure or long standstill times.
Stacking under a directional control valve in a "sandwich" configuration.
Note: The nameplate shows "A420-392," which is likely a batch or internal manufacturing tracking code.
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