Product Overview
The Rexroth DA 10-1-56/100-17 (Material No. R900500650) is a pilot-operated pressure unloading valve from the proven Rexroth DA series of pressure control valves. It is engineered to automatically unload a hydraulic system from a preset operating pressure down to a lower unloading pressure, thereby reducing power consumption, limiting heat generation, and protecting downstream components during idle or low-demand phases. The valve operates on a balanced spool principle with an adjustable pressure setting, providing precise and repeatable switching between the loading and unloading states. With a nominal size of 10 and a pressure rating of up to 100 bar, this model is designed for direct integration into industrial hydraulic power units and manifold blocks, serving as a reliable interface between pump output and system demand.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pressure Control Valve — Pressure Unloading Valve |
| Model Designation | DA 10-1-56/100-17 |
| Material Number | R900500650 |
| Nominal Size | NG10 (DIN 24340 / ISO 4401 size 10 interface) |
| Operating Pressure | Up to 100 bar (pressure setting range per model code) |
| Adjustment Type | Adjustable pressure setting (spindle / set screw design) |
| Mounting & Connection | Subplate / manifold mounting, ISO 4401 standard port pattern |
| Hydraulic Fluid | Mineral oil based hydraulic fluids (HL, HLP) per DIN 51524 |
Engineering Features & Advantages
- Precision Pressure Control: Balanced spool and pilot-operated unloading stage deliver accurate, repeatable switching between loading and unloading pressures, minimizing pressure overshoot and system shock.
- Energy-Efficient Unloading: Automatically relieves pump output to tank at low pressure during idle periods, reducing power draw, oil heating, and wear on the pump and drive motor.
- Industrial Reliability: Robust cast and machined body with hardened, precision-lapped spool designed for continuous operation under severe industrial conditions.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth DA series OEM standards, including the standard NG10 subplate interface.
- Simple Adjustment: Accessible pressure setting element allows quick field calibration to match specific system unloading requirements.
Typical Industrial Applications
This pressure unloading valve is widely deployed in hydraulic power units and manifold systems across heavy industry, including plastic injection molding machines, metallurgical presses and rolling mills, construction and marine hydraulic systems, CNC machine tools, and general industrial power packs where controlled pump unloading and pressure limitation are essential for efficiency and component protection.
PRODUCT IMAGES
REXROTH DA 10-1-56/100-17 / R900500650 Pressure Unloading 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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- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine REXROTH DA 10-1-56/100-17 / R900500650 Pressure Relief Valve. This Germany-made hydraulic component features a direct-acting design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.