The STONEL QX2VK02HDM QX2VK05HDM QX33K02HDM series delivers a versatile lineup of heavy duty valve limit switches designed to meet a broad range of position feedback requirements for quarter turn pneumatic and electric actuators. STONEL, an industry trusted manufacturer of industrial automation accessories, has engineered these three models to offer different contact densities and enclosure types while maintaining high reliability, IP67 environmental protection, and NAMUR mounting compatibility. This series is suitable for applications including water treatment pipelines, chemical dosing skids, power generation valve islands, mining slurry lines, and general manufacturing processes where durable valve status indication is required.

The STONEL QX2VK02HDM is a compact dual microswitch limit switch box featuring two independent SPDT mechanical switches rated at 5A 250V AC. The enclosure is constructed from glass reinforced polyester with a low profile height of just 68 millimeters, making it ideal for mounting on small bore actuators and tight installations. External cam adjustment allows stroke setting from 30 to 120 degrees using a hex key without removing the cover. A bright visual position indicator with red and green sectors provides immediate local confirmation. Two M20 cable entries are provided, and the IP67 rating ensures protection against dust and temporary immersion. Operating temperature ranges from -25°C to +85°C. The STONEL QX2VK02HDM is the standard choice for simple open close feedback on isolation valves in HVAC, food processing, and packaging lines.

For applications requiring more feedback channels, the STONEL QX2VK05HDM offers five independent microswitches within the same compact polymer enclosure. This high density configuration provides five SPDT contact outputs, allowing monitoring of multiple intermediate positions, separate alarm contacts, or redundant signals for safety critical loops. Each switch is rated at 3A 250V AC, sufficient for most PLC and relay inputs. The STONEL QX2VK05HDM retains external cam adjustment with five independent cam lobes, a visual position indicator, two M20 entries, and IP67 protection. This model is particularly valuable for complex valve sequencing, partial stroke testing with position verification, and diagnostic applications where additional contact points are needed without increasing enclosure size.

When a more robust enclosure is required for heavy industrial environments, the STONEL QX33K02HDM features a die cast aluminum housing with a durable polyester powder coating. This model contains two heavy duty microswitches rated at 10A 250V AC, suitable for direct switching of solenoid valves, pilot lights, and other power circuits without intermediate relays. The aluminum enclosure provides superior mechanical impact resistance and is rated IP66 and IP67, with ATEX flameproof certification available as an option. The STONEL QX33K02HDM includes externally adjustable cams, a large visual position indicator visible from 20 meters, and two M20 or 1/2 inch NPT cable entries. Operating temperature spans -40°C to +85°C. This model is the preferred choice for mining conveyors, steel mill hydraulic systems, and outdoor pipeline stations where physical robustness is critical.

All three STONEL limit switches share NAMUR VDI VDE 3845 mounting with standard drive shaft adapters for 9mm, 11mm, and 14mm square or double D actuator stems. Mounting brackets for non standard actuators are available as accessories. Each unit undergoes full mechanical and electrical testing before shipment, and the visual indicator is UV stabilized for long outdoor life. For plant maintenance teams seeking a family of position switches that scales from compact dual contact to high density five contact and heavy duty aluminum versions, the STONEL QX2VK02HDM QX2VK05HDM QX33K02HDM series provides application matched reliability without unnecessary complexity. Specify STONEL for valve feedback solutions that fit every budget and duty class.