Product Overview
The Rexroth Z2S16A1-51 (Material Number R900328798) is a pilot operated check valve designed for leak-free load holding and load control in industrial hydraulic systems. As part of the Rexroth Z2S series, this valve is a modular (sandwich) plate design that mounts between a directional control valve and its subplate, providing reliable blocking of flow in one direction while allowing free flow in the opposite direction. Pilot pressure applied to the internal control piston opens the poppet, permitting reverse flow only when the system commands it. This valve is engineered for high-pressure industrial circuits requiring precise load retention, preventing actuator drift and uncontrolled movement under load.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pilot Operated Check Valve (Modular / Sandwich Plate Design) |
| Model Designation | Z2S16A1-51 / R900328798 |
| Nominal Size | NG16 (Size 16 per ISO 4401 / CETOP 7 interface) |
| Operating Pressure | Up to 315 bar (working pressure, standard industrial grade) |
| Cracking Pressure | Standard spring setting (typically 1.5 to 4 bar, model-dependent) |
| Pilot Ratio | Standard Rexroth pilot ratio for reliable opening under load |
| Mounting & Connection | Modular sandwich mounting per ISO 4401 / DIN 24340, port pattern NG16 |
| Sealing | NBR (Buna-N) seals, suitable for mineral oil based hydraulic fluids |
| Fluid Compatibility | Mineral oil HL / HLP per DIN 51524, phosphate ester on request |
Engineering Features & Advantages
- Precision Performance: Poppet-type seat design ensures zero-leak blocking in the closed direction, effectively preventing load drift and holding actuators securely under sustained pressure.
- Pilot Controlled Opening: Integrated pilot piston allows controlled reverse flow only when pilot pressure is applied, enabling safe and sequenced operation of cylinders and motors.
- Modular Sandwich Construction: Compact NG16 plate design mounts directly between directional valve and subplate, minimizing piping, reducing leak points, and simplifying system integration.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened internal components for long service life and stable performance.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth OEM standards, ensuring drop-in replacement without modification.
Typical Industrial Applications
This pilot operated check valve is
PRODUCT IMAGES
REXROTH Z2S16A1-51/ / R900328798 Pilot Operated Check Valve
⚡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine REXROTH Z2S16A1-51/ / R900328798 Pilot Operated Check Valve. This Germany-made hydraulic component features a pilot-operated design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.