The most commonly used door closers are exterior door closers, which are mounted as follows:

The most common standard usage is to install the door closer to the hinged side, the door open side. When installed, the arm of the door closer protrudes outward, approximately 90 ° from the door frame.

In a second use, the door closer is mounted on the side opposite to the hinge side, with the door closed. Typically, an additional bracket provided along with the door closer is mounted to the arm parallel to the door frame. This use is typically made on an exterior door which is not intended to be mounted outside of the building with the door closer open.


The door closer is mounted to the door frame instead of the door, and the door closer is on the opposite side of the door hinge. This use may also be made for outer doors which are opened outwardly, in particular with only a narrow upper edge, without sufficient space to accommodate the doors of the door closer.


The third use, vertical door closers (built-in vertical door closers) upright stealth in the door shaft side of the inside, from the outside can not see the screws and parts, can be made with the door, single two-way opening and closing, Construction is simple.


B, door closers installation steps:


Usually with the door closers to provide instructions for the installation of a model, so first read the instructions, according to the door to open the direction of the size of the door closing force and the door closers body, connecting seat and door hinge installation size to determine the installation location.


2) According to the size of the closing force requirements, by connecting the seat reverse 180 ° or change the connection between the connecting rod and connecting seat position, you can change the closing force. Adjust the connecting rod and the hinge centerline distance is greater, then the closing force of the door closer, the greater the strength of the contrary.


3) according to the location of the installation instructions on the model to determine the location of the installation of screws, and then drilling, tapping.


4) Install the door closer by screws.


5) Install the fixed connector.


6) Install the drive plate with screws.


7) Adjust the lever to 90 ° to the door frame, and then connect the connecting rod to the drive plate.


8) Do not forget to install the plastic cover, it can be used to catch the door closers leakage of hydraulic oil.


9) After installation, check the fastening screws are tight, not loose or unstable phenomenon. Open the door to the maximum door opening position and check whether the hinged arm of the door closer or collides with or rubs against the door or frame.


Closing door closing speed


10) according to the need to adjust the closing speed of the door closer. Normally, the door closer has two speed control (throttle spool) screws. The top of the adjustment screw for the first paragraph of the door speed adjustment screw, the bottom of the adjustment screw for the second paragraph (usually 10) closed speed adjustment screw.


C, behind closed doors use and maintenance, repair


The newly installed door closer to use in a week to 10 days or so, should check all the screws, and re-tighten again.


Use hydraulic oil recommended by the manufacturer, for cold areas should use low pour point of hydraulic oil.


After the door closer in use should be checked regularly, check the contents are: the installation of screws are loose and missing, whether the connection arm with the door or door frame wipe the door, whether the door deformation and loosening, closing the buffer effect, bearing orientation Whether the oil spills.


Usually in the door closer after use for some time will appear the following questions:


1) the installation screw loose or lost, resulting in the door closer is not in the correct installation position, the connecting arm is damaged;


2) when the door closers closed buffer worse, resulting in the door and door frame between the impact of deformation of the door;


From the structure point of view, behind closed doors is a closed whole, basically do not see from the appearance of good or bad quality.


Closer is the most critical quality problem is whether the oil, because the door closers is to rely on its internal hydraulic system throttling fluid to achieve the process of closing control, oil leakage means that the failure of the hydraulic system, the hydraulic system is The only criterion for determining the service life of the door closer.


The main reason for the oil leakage is that the pinion bearing guide wears to increase the gap, the sealing ring wear causes the sealing effect to drop or when the cushioning effect is adjusted, the throttle spool rotates counterclockwise away from the valve body.


The reduction in the buffering effect of the door closer is caused by an increase in the clearance between the inlet of the cylinder due to oil leakage and the engagement of the rack-and-plunger guide cylinder with the valve body. Therefore, the quality and precision of the pinion, the support guide material, the heat treatment and the machining are very important.


For the buffer door closers, only by throttling throttle throttling is not a fundamental solution to the problem. Must be through the maintenance approach, if the support guide at the oil spill, remove the bearing guide, check the status of the ring, such as wear or aging failure, replace the seal. If the clearance between the support guide and the pinion shaft is too large, replace the support guide. If it is the guide cylinder plunger guide wear, and the gap between the valve body increases with the reduction of throttle effect, remove the rack plunger, with the surface of chrome to repair. In addition, to ensure that the door closers buffer effect, the switch to a softer spring, but also reduce the buffered effect of the back door on the door frame impact force of a method.


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