LCN 4631GLBLK Electrohydraulic Surface-Mounted Door Closer with Auto Equalizer Technology

The LCN 4631GLBLK represents a significant advancement in commercial door control through its electrohydraulic system. Unlike conventional spring-and-oil hydraulic closers that rely on fixed valve adjustments and a mechanical spring, the electrohydraulic mechanism provides dynamic, adaptive control. This system continuously monitors door position and applies precise hydraulic pressure to manage opening and closing forces. The 'Auto Equalizer' technology ensures that the door's opening force remains consistently low (90 Powered maximum opening angle) to comply with ADA and ANSI A117.1 accessibility standards, irrespective of door weight or external factors. For closing, the electrohydraulic circuit modulates fluid flow to deliver independent, finely tuned control over both the closing speed and the final latching speed, eliminating the need for manual valve adjustments common in less sophisticated units. An integrated back-check function electronically resists abusive door openings beyond a set point, protecting the door and frame from impact. The robust cast iron body provides a stable, highly durable hydraulic reservoir, capable of withstanding the rigors of high-traffic commercial use, evidenced by its exceptional 10,000,000+ cycle test rating. Although the LCN 4631GLBLK is not fire-rated, its UL Listing confirms compliance with stringent safety standards for general door control applications. The Grade 1 classification under ANSI A156.19 further assures its suitability for heavy-duty institutional and commercial installations requiring superior durability and controlled access.