Product Overview
The Rexroth Z2S 6A1-66 (Material Number R900347498) is a pilot operated check valve designed for leak-free load holding and controlled flow in hydraulic systems. As part of the Rexroth Z2S series, this valve is a modular sandwich plate component that prevents reverse flow in one direction while allowing free flow in the opposite direction until a pilot pressure signal unlocks the check function. This design is essential for maintaining actuator position under load, preventing drift in vertical cylinders, and providing safe controlled lowering in lifting applications. The Z2S 6A1-66 is engineered for direct integration into standard ISO 4401-03 (NG6) mounting patterns, making it a reliable and serviceable component for demanding industrial hydraulic circuits.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pilot Operated Check Valve (Modular Sandwich Plate) |
| Model Designation | Z2S 6A1-66 / R900347498 |
| Nominal Size | NG6 (ISO 4401-03 / CETOP 3) |
| Operating Pressure | Up to 315 bar (working pressure) |
| Cracking / Pilot Pressure | Pilot ratio 1:1 (A1 version), low pilot pressure required |
| Mounting & Connection | ISO 4401-03 sandwich plate, subplate mounting |
| Sealing | NBR (Buna-N) seals, suitable for mineral oil based fluids |
| Flow Direction | Free flow A→A1, blocked reverse A1→A; pilot release via B |
Engineering Features & Advantages
- Leak-Free Load Holding: The poppet-type check valve design provides zero-leak sealing in the blocked direction, ensuring actuators remain locked in position without drift under sustained load.
- Pilot Operated Release: External pilot pressure acting on the control piston opens the check valve, allowing controlled return flow for safe and precise lowering of loads.
- Modular Sandwich Construction: Designed for direct mounting between directional control valves and subplates on ISO 4401-03 interfaces, simplifying system integration and reducing piping complexity.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with robust internal components and proven Rexroth manufacturing quality.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM standards, ensuring drop-in replacement without modification.
Typical Industrial Applications
The Rexroth Z2S 6A1-66 pilot operated check valve is widely used in hydraulic systems requiring reliable load holding and controlled motion. Typical applications include plastic injection molding machines, metallurgical presses, construction and marine hydraulics, CNC machine tools, and lifting equipment where vertical loads must be securely held and safely lowered. Its modular design makes it ideal for
PRODUCT IMAGES
REXROTH Z2S 6A1-66/ / R900347498 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 Z2S 6A1-66/ / R900347498 Pilot Operated Check Valve. This Germany-made hydraulic component features a leak-free poppet design, delivering reliable fluid control for heavy-duty industrial systems.