Alarm fire lock _ Tian Rong fire doors (certified) _ Zhumadian fire lock

 Behind closed doors in spring release process, since the hydraulic oil behind closed doors left chamber is compressed, the check valve is closed fire lock, hydraulic oil can only flow out through the gap between the housing and the piston, and through the plunger holes and 2 core fitted with a throttle flow path back into the right cavity. Therefore, hydraulic oil for spring release constitutes a resistance that achieved by throttling cushioning effect, the door closed speed is controlled. The throttle valve can be adjusted on the push latch-type fire lock, you can control the different travel segments, variable closing speed. Although there are differences between different manufacturers of door closers structure, size, but the principle is the same. Kind of door closers can be divided into: externally mounted and built-in door top closers, built-in door closers, door closers bottom (in spring), vertical door (built vertical closed doorstop) and other types of door closers. Technical requirements and test methods for fire lock one, fire lock the technical requirements: firmness, flexibility and appearance of a fire safety locks should be consistent with the provisions of QB / T2474's. 2 fire lock the refractory time should not be less than the installation of fire doors fire resistance. 3 fire resistance test process Kaideng fire lock, fire safety locks should be no significant deformation and melting phenomenon. 4 fire resistance test, fire safety locks should be no channeling fire phenomenon. 5 fire resistance test, fire safety locks should be able to ensure fire doors doors closed. Alarm fire lock _ Tian Rong fire doors (certified) _ Zhumadian fire lock provided by the Zhengzhou Tian Rong Fire Door. Zhengzhou Tian Rong Fire Door (www.hntianrong.com) is Zhengzhou, fire-resistant, fire prevention materials leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the glory days of fire doors leadership with the staff warmly welcome all inquiries negotiations to create the glory days of the fire doors and a better future.