The ASSA ABLOY DC175-EV1's operational efficacy is rooted in its advanced hydraulic cam-motion mechanism. Unlike traditional rack-and-pinion systems, the cam-motion design delivers a progressive reduction in opening resistance, making doors easier to operate, especially for individuals with limited mobility. This is achieved by converting the rotary motion of the door into a linear movement within the closer's hydraulic cylinder via a cam, ensuring a smooth, consistent force transmission throughout the opening and closing cycles.
Central to its performance are the finely calibrated hydraulic valves. These adjustable valves grant precise control over the crucial closing and latching phases. The variable closing speed valve dictates the door's travel from its maximum opening angle of 160 degrees down to the latching point, preventing slamming and ensuring safe passage. Subsequently, the variable latching speed valve provides a controlled burst of force in the final few degrees of closure, ensuring the door firmly engages with the lock or latch without undue impact. This dual-stage control is critical for maintaining security and minimizing wear.
The integrated back-check function is a passive hydraulic damping system activated when the door is opened beyond a pre-set angle, typically around 70-80 degrees. It acts as a hydraulic cushion, resisting violent opening and preventing damage to the door, frame, and adjacent walls. This feature significantly enhances the durability of the door assembly in high-traffic or wind-prone areas.
Crucially, the DC175-EV1's compliance with EN 1154 CE and BS EN 1154 standards underscores its engineering integrity and suitability for fire and smoke protection doors. The EN 1154 standard specifies requirements for controlled door closing devices, including durability, efficiency, and resistance to environmental factors. Certification ensures that the closer will perform reliably in emergency situations, ensuring the automatic closure of fire doors to compartmentalize smoke and flames. While a specific cycle test rating is not explicitly provided, its EN 1154 certification inherently mandates rigorous durability testing, ensuring sustained operational reliability over its intended lifespan.
