Product Overview
The COAX Block MK 10 NC / 515881 is a coaxial valve module engineered by COAX (a brand of Müller Co-ax AG), a globally recognized specialist in coaxial valve technology. Unlike conventional poppet or spool valves, this module utilizes a coaxial working principle in which the actuating piston and the sealing element are arranged concentrically on a single axis, allowing the medium to flow directly through the center of the valve. This design delivers exceptionally high flow rates with minimal pressure loss, reliable bidirectional sealing, and superior resistance to contamination and wear. The MK 10 NC designation indicates a normally closed (NC) configuration, meaning the valve remains shut when de-energized and opens upon actuation. As a process and pneumatic valve module, it serves as a critical control element for precise shut-off, release, and regulation of neutral and aggressive media in demanding industrial process circuits.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Coaxial Valve Module (Process & Pneumatic Valve) |
| Model Designation | COAX Block MK 10 NC / 515881 |
| Valve Function | Normally Closed (NC) — opens on actuation |
| Operating Pressure | Standard Industrial Grade (up to rated bar per COAX MK series) |
| Working Principle | Coaxial piston/sealing element on a single axis, flow through center |
| Mounting & Connection | Standard ISO / Manufacturer Interface (COAX block mounting) |
Engineering Features & Advantages
- Precision Performance: The coaxial design provides a straight-through flow path with minimal pressure drop, enabling high flow capacity and fast, repeatable actuation response for accurate process control.
- Leak-Tight Bidirectional Sealing: Concentric sealing geometry ensures reliable shut-off in both flow directions, making the module suitable for critical isolation and release duties.
- Contamination Tolerance: The self-cleaning coaxial seat and robust sealing element resist particulate and viscous media, reducing downtime and maintenance in dirty process environments.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with durable materials suited to neutral and aggressive media.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original COAX OEM standards, ensuring drop-in replacement for the MK 10 NC / 515881 module.
Typical Industrial Applications
The COAX Block MK 10 NC / 515881 coaxial valve module is deployed across heavy industrial sectors where reliable media shut-off and high flow performance are essential. Typical applications include plastic injection molding machines and process equipment requiring precise mold cooling and media control, metallurgical presses and furnace systems handling hydraulic and cooling circuits, chemical and petrochemical process plants managing neutral and aggressive fluids, and general pneumatic and hydraulic control panels in CNC machine tools, packaging machinery, and marine or construction hydraulic systems.
PRODUCT IMAGES

COAX Block MK 10 NC / 515881 Coaxial Valve Module
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- 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 COAX Block MK 10 NC / 515881 Pneumatic Actuated Seat Valve. This Germany-made hydraulic component features a compact block design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.