The LCN 4510-7361 Smoothee Series door closer represents a pinnacle of hydraulic engineering for demanding door control applications. Its core mechanism features a precision-machined, cast iron cylinder housing a high-performance hydraulic fluid system. This sealed system, coupled with robust adjustable valves, allows for granular control over three critical phases of door operation: closing speed, latching speed, and back-check intensity. The adjustable closing speed valve permits precise regulation of the door's travel from its maximum opening angle of 140 degrees down to approximately 15 degrees from the frame. This prevents uncontrolled swinging and ensures a smooth, quiet closure. The independent latching speed valve then dictates the final 10-15 degrees of door travel, providing sufficient force to overcome latch resistance without slamming, crucial for secure closure in high-traffic environments. Crucially, the integrated adjustable back-check function engages when the door is aggressively opened, creating hydraulic resistance that protects the door, frame, and hardware from potential damage due to forceful impacts. This feature significantly extends the lifespan of the entire door assembly. Compliance with ANSI/BHMA A156.4 Grade 1 is a testament to the 4510-7361's engineered durability and operational excellence. This rigorous standard mandates superior performance characteristics, including consistent closing force, controlled operation, and resistance to wear. The closer's exceptional 10,000,000-cycle test rating further validates its long-term reliability and low maintenance requirements in severe service conditions. While the LCN 4510-7361 is not designated as fire-rated, its robust construction, featuring a heavy-duty cast iron body and forged steel extra-duty arm with a security cover, ensures continuous, precise door control essential for maintaining security and operational efficiency in non-fire barrier interior openings. The handed design and adjustable power size range from 1 to 6 allow for optimal customization to varying door widths (up to ~1524mm) and operational requirements, ensuring ADA or BAA compliance where applicable by managing opening forces effectively.
