The main purpose of a fire door closer is to allow the door to close on its own, limiting the spread of fire and ventilation inside the building. It is generally installed on the upper part of a swing door leaf or inside a built-in door leaf, and can be either exposed or hidden. The modern hydraulic door closer, a patent registered by the Americans in the early 20th century, achieved buffering effect by throttling the liquid in the door closer.

Function of door closer

The core of the design concept of hydraulic door closer is to achieve control over the door closing process, so that various functional indicators of the door closing process can be adjusted according to human needs. The significance of door closers is not only to automatically close the door, but also to protect the door frame and body (smooth closing). More importantly, door closers have become an indispensable part of intelligent management in modern buildings, especially commercial and public buildings.

How to choose a door closer

When choosing a door closer, these factors should be considered: door weight, door width, door opening frequency, usage requirements, and usage environment.

1. The weight and width of the door are the prerequisites for choosing a door closer model. Generally, when the door weight is small, choose a model with less force. Firstly, it feels easy to open the door and the installation on the door is also coordinated and beautiful; Secondly, small products are generally more economical, and vice versa.

2. The frequency of door opening is closely related to the quality requirements of the product. From a structural perspective, the door closer is a closed whole, and its quality cannot be seen from its appearance.

3. The most critical quality issue of a door closer is whether it leaks oil, because the door closer relies on the throttling of fluid in its internal hydraulic system to control the door closing process. Oil leakage means the failure of the hydraulic system, so the hydraulic system is the only standard that determines the service life of the door closer. Only in this way can we ensure long-term and normal use after installation, reduce the workload and cost of maintenance and updates, and also feel the convenience and enjoyment brought by door closer products.

Tips

To effectively install a door closer, the door and frame must have sufficient strength or be reinforced to ensure the stability of the door closer device. And the door should be installed with high-quality hinges that have been adjusted to prevent deviation.

The requirements for using door closers include:

1).  Do you need an automatic door stop function after opening the door

2).  Damping and buffering function - quickly opening the door to a certain position generates damping and buffering, and the damping and buffering force and range can be adjusted according to usage requirements; This function is used to prevent the door or lock from colliding with the wall when opening the door quickly with force, or to prevent people from losing weight and tilting forward to the ground during emergency evacuation when opening the door quickly.

3).  Delayed slow closing - the door slowly closes at a constant speed from the maximum position of the door, and can be adjusted continuously according to requirements

Suitable for use in ordinary and crowded places, especially hospitals, with doors and passages for the elderly, children, and disabled.

4).  Adjustable closing force function - It can be installed on doors with a wide range of weights and widths, as well as in places with high closing resistance due to environmental reasons, to achieve satisfactory closing force. It is particularly useful in coastal cities and places where the closing resistance of vehicles and ships often changes due to wind resistance.

5).  Usage environment: Fire prevention requirements (fire protection requirements), anti freezing requirements (places in northern winter with temperatures below minus 35 degrees Celsius)

To achieve optimal performance, fire doors must choose high-efficiency and appropriate force level door closers. To achieve comprehensive fire safety, fire doors must be effectively closed in the event of a fire, otherwise it may cause loss of life and property. The design and manufacturing of ASSA ABLOY hydraulic door closers selected by Weiman Door Industry fully comply with world-class standards. Its American standard door closer product series has passed the American standard ANSI 156.4 Level 1 2 million performance test, the American Underwriters Laboratories UL10C 3-hour fire protection standard, and the GA93-2004 door closer performance and fire resistance 90 minute test, ensuring the quality, efficiency, and reliability of the products.