The Godrej Dyna Door Closer Size 4 is fundamentally a hydro-mechanical device designed for controlled energy dissipation during door closure. Its core functionality relies on a high-grade Aluminium Alloy housing, encapsulating a precisely engineered hydraulic system. The hydraulic mechanism employs an advanced sealing system, ensuring containment of the hydraulic fluid under varying temperature and pressure conditions, thereby guaranteeing consistent damping performance throughout its operational lifespan.
**EN1154 Compliance and Power Classification:** This door closer is designed to meet the stringent requirements of the EN1154 European standard for controlled door closing devices, specifically categorized as an EN1154 Size 4 unit. This classification indicates its suitability for a defined range of door widths and weights, precisely up to 1100mm and approximately 80kg. The adjustable force range (EN1154 sizes 2-4) allows for nuanced adaptation to site-specific conditions, ensuring optimal closing force without excessive resistance, aligning with the performance criteria stipulated by EN1154 for safety and usability.
**Door Control Precision and Hydraulic Valving:** The precision of door control is achieved through two independently adjustable hydraulic valves: one for the closing speed (sweep speed) and another for the latching speed (final closing phase). These valves regulate the flow rate of the hydraulic fluid, allowing installers to fine-tune the door's movement from an opening angle of up to 160 degrees down to the fully closed and latched position. This granular control prevents abrupt slamming, protects door hardware, and ensures secure latching, critical for security and energy efficiency.
**Durability and Functional Scope:** The design is optimized for longevity, validated by a robust 500,000 cycle test rating, far exceeding the requirements for many commercial applications and indicating a high degree of material and component resilience. The non-handed design simplifies installation logistics, allowing for universal application irrespective of door swing direction.
**Operational Limitations:** It is imperative for specifying engineers to note the specific functional exclusions: the Godrej Dyna Door Closer Size 4 is explicitly **not fire-rated**, rendering it unsuitable for integration into fire door assemblies where compliance with fire resistance standards is mandatory. Furthermore, the absence of back-check, hold-open, and delayed action functions means it is not engineered for applications requiring protection against abusive opening, temporary door retention, or extended opening periods for accessibility. Its utility is therefore focused on core controlled closing for general access points.
