How the door closer works: From the outside of the door closer, it looks like a human arm. In fact, the development of such a door closer is modeled after the human arm. Add liquid to the door closer to pull back. 1) Whether there is an automatic door stop function after opening the door; 2) Damping buffer function - Damping buffer is generated after quick opening to a certain position, and the damping buffer force and range can be adjusted according to the use requirements; this function is used to prevent the door or lock from colliding with the wall when the door is opened quickly, or emergency escape It prevents people from losing weight when they open the door quickly and tilts forward to the ground. 3) Delayed slow closing - the door is closed slowly from the maximum position of the door, and can be adjusted steplessly according to requirements. It is suitable for use in places where people enter and exit frequently and in many places, especially in hospitals, and there are doors and passages for the elderly, children and disabled people. 4) The closing force can be adjusted - it can be installed on different doors with a wide range of door weights and door widths, as well as places with high door closing resistance due to environmental reasons. Festive stepless adjustment can achieve satisfactory closing power, especially in places where coastal cities, vehicles and ships are affected by wind and the closing resistance (force of the door) changes frequently. 5) Use environment: Fire and fire protection requirements and anti-freeze requirements for locations at minus 35° in winter. Usually, the choice of the door closer can be matched with the size and weight of different doors according to the manufacturer's product specification parameters, according to different strengths or adjustable forces. The table below shows the quality/size of the seven grade test doors specified in British Standard BS EN 1154 (a recognized standard for door closer classification). The closing force of the door closer usually specifies a value between 1 and 7, the greater the number, the greater the ability of the door closer. The fire protection requirements for fire doors are that the door closers must be installed to ensure that the fire door access doors are normally closed. Concerned about surprises Label: How the door closer works on fire doors Previous: Four details of the open kitchen to pay attention to Next: Special cork flooring, shockproof, soundproof and elastic Measuring Tape,Metric Tape Measure,Rolling Tape Measure,Metric Tape SHANGQIU CHAOYUE MEASURING TOOLS CO., LTD , https://www.equipmentool.com