Product Overview
The Rexroth Z2S16B1-51 (Material Number R900328799) is a pilot-operated check valve designed for leak-free load holding and controlled flow blocking in hydraulic systems. Part of the Rexroth Z2S series of sandwich plate (modular) valves, it is engineered to prevent reverse flow in a hydraulic line until a pilot pressure signal is applied to release the poppet. This valve is a critical safety and control component in industrial hydraulic circuits, ensuring that actuators, cylinders, and loads remain securely locked in position when the directional valve is centered or the system is depressurized. Its modular design allows direct mounting between a directional control valve and a subplate, minimizing piping and installation footprint.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pilot Operated Check Valve (Modular / Sandwich Plate Design) |
| Model Designation | Z2S16B1-51 / R900328799 |
| Nominal Size | NG16 (DIN 24340 / ISO 4401-07) |
| Operating Pressure | Up to 315 bar (working pressure) |
| Cracking Pressure | Standard spring setting (approx. 1.5 bar, model-dependent) |
| Pilot Ratio | Standard pilot ratio for reliable opening under load |
| Mounting & Connection | Sandwich plate mounting per ISO 4401 / DIN 24340, NG16 interface |
| Sealing Material | NBR (standard); FKM available on request |
Engineering Features & Advantages
- Leak-Free Load Holding: The poppet-type seat design provides virtually zero internal leakage in the blocked direction, ensuring actuators and suspended loads remain locked safely in position without drift.
- Pilot-Controlled Release: A pilot pressure signal acting on the release piston opens the valve against the load pressure, enabling controlled lowering or reverse movement only when commanded by the system.
- Modular Sandwich Construction: Designed for direct mounting between directional valves and subplates, reducing piping complexity, leak points, and overall installation space.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened poppet and seat for long service life and resistance to contamination.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth OEM standards, ensuring drop-in replacement without modification.
Typical Industrial Applications
The Rexroth Z2S16B1-51 pilot-operated check valve is widely used in heavy industrial hydraulic systems requiring secure load holding and controlled motion, including: plastic injection molding machines (clamping and injection axis locking), metallurgical presses and rolling mills (holding pressure during process cycles), construction and marine hydraulics (outrigger and boom locking), and CNC machine tools (axis clamping and position holding). It
PRODUCT IMAGES
REXROTH Z2S16B1-51/ / R900328799 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.
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- 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 Z2S16B1-51/ / R900328799 Pilot Operated Check Valve. This Germany-made hydraulic component features a pilot-operated design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.