Product Overview
The Rexroth SL6PB1-62 (Material Number R900491117) is a pilot-operated check valve from the SL Series modular valve family, engineered for leak-free load holding and controlled flow release in industrial hydraulic systems. As a sandwich-style modular component, it is designed for direct mounting between a directional control valve and a subplate or manifold block, conforming to the ISO 4401 / DIN 24340 interface standard. The valve permits free flow in one direction and blocks reverse flow until a pilot pressure signal is applied to the release port, at which point the poppet is hydraulically unseated to allow controlled return flow. This working principle makes it essential for load-holding circuits, cylinder locking, and preventing drift in vertical or gravity-loaded actuators.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pilot-Operated Check Valve (Modular / Sandwich Plate Design) |
| Model Designation | SL6PB1-62 / R900491117 |
| Size / Nominal Diameter | NG6 (CETOP 3 / ISO 4401-03) |
| Operating Pressure | Up to 315 bar (working pressure, standard industrial grade) |
| Cracking / Pilot Pressure Ratio | Pilot-operated release, area ratio per SL series standard |
| Mounting & Connection | ISO 4401-03 modular interface, sandwich mounting between valve and subplate |
| Sealing | NBR (Buna-N) seals, suitable for mineral oil based hydraulic fluids |
| Fluid Compatibility | HL, HLP, HLPD hydraulic oils per DIN 51524 |
Engineering Features & Advantages
- Leak-Free Load Holding: The seated poppet design provides virtually zero internal leakage in the blocked direction, preventing actuator drift and ensuring safe load retention in vertical or clamping applications.
- Pilot-Operated Release: Reverse flow is enabled only when pilot pressure is applied, allowing controlled and deliberate lowering or retraction of loaded actuators without uncontrolled movement.
- Modular Sandwich Construction: The NG6 sandwich plate design integrates directly into existing valve stacks, minimizing piping, reducing leak points, and simplifying system assembly and maintenance.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened poppet and seat geometry for long service life and consistent sealing performance.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth SL series modular valves and the R900491117 material number, ensuring drop-in replacement without modification.
Typical Industrial Applications
The Rexroth SL6PB1-62 pilot-operated check valve is widely deployed in hydraulic systems requiring reliable load holding and controlled release. Typical applications include plastic injection molding machines (clamping and ejector circuits),
PRODUCT IMAGES
REXROTH SL6PB1-62 / R900491117 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 SL6PB1-62 / R900491117 Pilot Operated Check Valve. This Germany-made hydraulic component features a robust poppet design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.