Usually in the closed door after a period of time there will

(1)   Install the screw loose or missing, leading to closer not in the correct installation position, the connecting arm is damaged;

(2)   When the door closer closes, the buffering effect becomes worse, and the door body and the door frame are impacted, and the door body is deformed;

       From a structural point of view, the door closer is a closed whole, from the appearance is basically can not see its quality.

      Closed the most critical quality issues is whether the leak, because the door closer is to rely on the throttle of the fluid inside the hydraulic system to control the process of closing the door, leakage means failure of the hydraulic system, the hydraulic system is the only standard decision closers service life.

       The main reason of leakage of the gear shaft circumference, seal wear caused by the sealing effect is reduced, or in the regulation of speed control valve rotating too much, causing the valve to pop out, or other shell subjected to multi hole, surface roughness caused by the oil leakage.

      Reduce the closers buffering effect is due to oil spill into the air or the clearance between the piston and the housing increased. Therefore, the gear shaft, piston material, quality and precision of heat treatment and machining is very important.

       For the poor effect of closing buffer, only by adjusting the speed valve throttle is not fundamentally solve the problem. The manufacturer must be returned to repair or replace.