Product Overview
The Rexroth SL 20 GB 3-45/S0311 (Material No. R900052808) is a pilot-operated check valve from the proven Rexroth SL series, designed for leak-free load holding and controlled load lowering in industrial hydraulic systems. As a pilot-operated (pilot-to-open) check valve, it permits free flow in one direction and blocks reverse flow until a sufficient pilot pressure signal is applied to the pilot port, at which point the poppet is hydraulically unseated to allow controlled return flow. The SL series is a sandwich (modular) design that mounts between a directional control valve and a subplate or manifold, providing a compact, space-saving solution for load holding, load locking, and pressure retention functions. With a size 20 (NG20 / CETOP 8) interface, this valve is engineered for high flow capacity and reliable sealing performance in demanding industrial circuits.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pilot-Operated Check Valve (Modular / Sandwich Plate Design) |
| Model Designation | SL 20 GB 3-45/S0311 |
| Material Number | R900052808 |
| Nominal Size | NG20 (CETOP 8 / ISO 4401-08) |
| Operating Pressure | Standard Industrial Grade (up to 315 bar rated) |
| Cracking / Pilot Pressure Ratio | Pilot ratio per SL series standard (approx. 1:4.5 pilot-to-load) |
| Mounting & Connection | Sandwich plate, ISO 4401-08 / CETOP 8 interface with tie-rod or bolt mounting |
| Sealing | NBR (Buna-N) seals, optional FKM available |
| Fluid Compatibility | Mineral oil based hydraulic fluids (HL, HLP, HVLP) |
Engineering Features & Advantages
- Leak-Free Load Holding: The precision-ground poppet and seat design ensures virtually zero internal leakage in the blocked direction, making it ideal for holding suspended loads over extended periods without drift.
- Pilot-Controlled Release: Reverse flow is enabled only when pilot pressure is applied, allowing controlled and safe lowering of loads and preventing uncontrolled movement in the event of a pressure loss.
- Modular Sandwich Construction: The NG20 sandwich plate design integrates directly between the directional valve and subplate, minimizing piping, reducing leak points, and simplifying system assembly and maintenance.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with robust construction and wear-resistant internal components for extended service life.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original REXROTH OEM standards, ensuring drop-in replacement without modification to existing manifolds or piping.
Typical Industrial Applications
With a size 20 (NG20 / CETOP 8) interface, this valve is engineered for high flow capacity and reliable sealing performance in demanding industrial circuits.
PRODUCT IMAGES
REXROTH SL 20 GB 3-45/S0311 / R900052808 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 SL 20 GB 3-45/S0311 / R900052808 Solenoid Directional Spool Valve. This Germany-made hydraulic component features a reliable spool design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.