Modern hydraulic door closers (door closers for short) began with a patent registered by the Americans within the early twentieth century, that differs from ancient doors nearer by resistance the liquid within the door closer to realize a padding impact. The core of the look plan of hydraulic door n
The most commonly used door closers are external closers, which are installed in the following ways.Here is the content list:Door closer installation methodsDoor closer installation stepsDoor closer installation methodsDoor closers are generally divided into 3 types of installation Option A - Regula
Door closer products must meet the national standard GB2698-2005, fire door closers should also meet the requirements of GA93-1995 "fire door closers test". So what factors should be considered when choosing a door closer? The following is a detailed introduction.Here is the content list:The width a
Sometimes after a period of operation of the door closer will have some problems, so when there is a problem we should how to repair it? The following is a detailed introduction.Here is the content list: The usage and maintenance of door closersCommon problems1) Loose or missing mounting screws, r
Maybe you are a Door Control purchasing manager, who are looking for high quality Door Control, and Oubao Security Technology Co.,Ltd. are a professional manufacturer & supplier that can meet your needs. Not only Door Control we produced have certificated the international industry standard, but we can also meet your customization needs. We provide online, timely service and you can get professional guidance on Door Control. Don't hesitate to get in touch with us if you are interested in Door Control, we won't let you down.