Product Overview
The Rexroth SL20GA1-4X/M (Material Number R900587554) is a pilot-operated check valve from the SL series, size 20, designed for leak-free load holding and controlled flow release in industrial hydraulic systems. As a modular sandwich-style valve, it is mounted between a directional control valve and its subplate, allowing it to block flow in one direction while permitting free flow in the opposite direction until a pilot pressure signal unlocks the poppet. The “GA” configuration denotes a pilot-operated check function with external pilot supply, while the “4X” designates the Rexroth component series 40 to 49, ensuring dimensional and functional interchangeability within this generation. The valve is engineered for reliable load locking in circuits where actuators must hold position against gravity or external forces without drift.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pilot-Operated Check Valve (Modular / Sandwich Plate Design) |
| Model Designation | SL20GA1-4X/M / R900587554 |
| Nominal Size | NG20 (Size 20 per ISO 4401 / DIN 24340) |
| Component Series | 4X (Series 40 to 49, installation-compatible) |
| Operating Pressure | Up to 315 bar (working pressure, standard industrial grade) |
| Pilot Pressure Ratio | External pilot supply, area ratio per Rexroth SL series standard |
| Mounting & Connection | Sandwich plate mounting per ISO 4401 / DIN 24340, NG20 interface |
| Sealing | NBR (M variant), suitable for mineral oil based hydraulic fluids |
Engineering Features & Advantages
- Leak-Free Load Holding: The seated poppet design provides zero-leak blocking in the closed direction, preventing actuator drift and maintaining position under sustained load.
- Pilot-Controlled Release: External pilot pressure acts on the poppet to open the valve, enabling controlled return flow only when the directional valve is actuated, ensuring safe and predictable circuit behavior.
- Modular Sandwich Construction: Compact NG20 sandwich plate design integrates directly into existing valve stacks without additional piping, reducing installation time and leakage points.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened poppet and seat for long service life and consistent sealing performance.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth SL series NG20 valves, ensuring drop-in replacement without modification.
Typical Industrial Applications
This pilot-operated check valve is widely used in hydraulic systems requiring reliable load holding and controlled release, including plastic injection molding machines, metallurgical presses, construction and marine hydraulics, and CNC machine tools. It is particularly suited for
PRODUCT IMAGES
REXROTH SL20GA1-4X/M / R900587554 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 SL20GA1-4X/M / R900587554 Solenoid Directional Spool Valve. This Germany-made hydraulic component features a reliable spool design, delivering leak-free, precise fluid control for heavy-duty industrial systems.