The Dormakaba TS73V's engineering prowess is primarily vested in its precision hydraulic system and robust mechanical design, ensuring both compliance and longevity. At its core, the hydraulic mechanism utilizes a non-compressible fluid within a sealed body, precisely metered through adjustable valves. This allows for granular control over the door's kinetic energy dissipation. Separate adjustable valves govern the main closing speed (from open to approximately 15°) and the critical latching speed (final 15° to closed). This dual-valve system is pivotal for ensuring fire doors fully engage their latches and seals, a non-negotiable aspect of fire compartmentation, while preventing slamming that can damage doors and frames.
Compliance with **EN1154** is fundamental, signifying the TS73V meets the European standard for controlled door closing devices. This standard dictates performance, durability, and safety parameters, including operational forces, opening angles, and temperature stability. The adjustable power size **EN2-4** is critical under EN1154, allowing the closer's spring force to be precisely set for specific door widths (up to 1100mm) and weights (up to 85kg), ensuring the door closes consistently and with appropriate force while remaining easy to open. This adjustability is achieved via a power adjustable spring, allowing installers to fine-tune the closer to site-specific conditions, ensuring optimal control without excessive opening resistance.
Furthermore, the integrated **back check** function provides hydraulic resistance when the door is opened aggressively beyond a certain point, protecting the door, frame, and surrounding walls from impact damage. The **delayed action** feature, another hydraulic control, significantly slows the door's closing cycle for a pre-determined duration from its fully open position, enhancing accessibility for individuals with mobility challenges, those pushing trolleys, or high-traffic scenarios.
Durability is underscored by its **steel body** construction and a validated **500,000 cycle test rating**. This rigorous testing against EN1154 criteria assures the closer's mechanical integrity and consistent hydraulic performance over hundreds of thousands of operations, making it suitable for high-traffic commercial environments. The fire-rated designation further certifies that the TS73V maintains its controlled closing capability under specified fire conditions, crucial for safety and regulatory adherence.
