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