Product Overview
The Rexroth SL 30 PA 2-42 (Material No. R900599473) is a pilot operated check valve designed for leak-free load holding and controlled flow in industrial hydraulic systems. As part of the Rexroth SL series modular valve family, this unit is manufactured to ISO 4401 / DIN 24340 interface standards, enabling direct sandwich mounting beneath directional control valves or as a standalone line component. The valve permits free flow in one direction and blocks reverse flow until a pilot pressure signal is applied to the pilot 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 safety-related functions where uncontrolled actuator drift must be prevented.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pilot Operated Check Valve (Modular / Sandwich Plate Design) |
| Model Designation | SL 30 PA 2-42 / R900599473 |
| Manufacturer | Rexroth (Bosch Rexroth) |
| Size / Nominal Diameter | NG30 (Size 30 modular interface) |
| Operating Pressure | Standard Industrial Grade (Up to rated bar per Rexroth SL series data) |
| Pilot Ratio | 2:1 (nominal pilot-to-load pressure ratio) |
| Mounting & Connection | ISO 4401 / DIN 24340 modular sandwich interface |
| Sealing | NBR / FKM options per application media |
Engineering Features & Advantages
- Precision Performance: Poppet-type seat design delivers zero-leak shut-off in the blocked direction, ensuring reliable load holding and preventing actuator drift in vertical or clamping applications.
- Pilot-Controlled Release: The 2:1 pilot ratio allows controlled opening of the check valve with minimal pilot pressure, enabling smooth and energy-efficient return flow in regenerative and load-lowering circuits.
- Modular Integration: Sandwich plate construction permits direct stacking with directional control valves, reducing piping, leak points, and installation time in manifold-based systems.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened internal components and robust housing for long service life.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM Rexroth SL series standards, ensuring drop-in interchangeability.
Typical Industrial Applications
This pilot operated check valve is widely deployed in plastic injection molding machines for mold clamping and injection axis holding, metallurgical presses requiring load retention during dwell cycles, construction and marine hydraulic systems with boom and outrigger locking functions, and CNC machine tools where precise axis positioning and drift-free clamping are critical. It is also suited for any manifold-based hydraulic circuit demanding reliable leak-free blocking with pilot-controlled
PRODUCT IMAGES
Rexroth SL 30 PA 2-42 / R900599473 Pilot Operated Check Valve
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Shop the genuine REXROTH SL 30 PA 2-42 / R900599473 Solenoid Directional Valve. This Germany-made 24V DC hydraulic component features a 2-way poppet design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.