Features of spring door closers

Spring door closer is a reliable device and is widely used when installing input and interroom door groups. The product is distinguished by high performance characteristics and can work without breakdowns for a long time.

Features and destination

One of the main conditions for the correct operation of the door systems is the smooth stroke of the web and the lack of impact load on the loop and the door frame. Solve the problem of soft and silent movement of the door will help installing a spring closer. The device allows you to independently choose the closing speed of the web and significantly reduces the intensity of wear of the door fittings. As a result, the door system retains a presentable view throughout the life.

The adjustment of the closer guarantees a significant reduction in the level of extraneous noise and significantly reduces the heat loss of premises in winter. Due to the dense fit of the canvas, it will be possible to get rid of drafts, which, in turn, leads to a reduction in the cost of heating and budget savings. The work of the spring device is completely safe and silent, which allows the installation of a device in the premises of any destination, including residential and public spaces.

Products are highly resistant to aggressive environmental conditions, Therefore, it can be used not only for interior doors, but also be installed on the input groups. The body of the instruments are manufactured by their heat-resistant alloys, which allows to operate the device in the range from -45 to +70 degrees.

However, not all products are distinguished by increased resistance to extreme temperatures, so when buying a device, it is necessary to carefully read the accompanying documentation. But almost all models have an anti-corrosion coating and can be used in high humidity.

Design and principle of work

Constructive spring closer with a sliding load is presented in the form of a housing equipped with a working mechanism and connected to a lever type. The working mechanism is made in the form of a rigid spring, the compression of which is carried out due to the effects of the piston. The spring is placed in a sealed housing, which is filled with oil, and after compression begins to gradually squeeze. The oil enters the housing through the network of hydraulic channels and provides a progressive return of the spring mechanism in the initial position.

Changing the closing speed of the closure is carried out using control screws installed from the end of the case. With their turn, the size of the hydraulic channels occurs, which leads to a slowdown or, on the contrary, increase the oil flow rate. It is the intensity of the influx of oil into the cylinder determines how the door will be closed.

If necessary, you can tighten or weaken the screw, with the result that the speed of the door will immediately change.

Instruments intended for installation on the input groups are equipped with special valves that hold the door running from an angle of 70 degrees to the full closure of the door. Approximately the 15th degree until the closure takes place with the oral. It is necessary so that the canvas easily overcome the resistance of the air and the door latch with the seal. In addition to the size of the section, the velocity of the door affects the viscosity of the oil in the working cylinder. This indicator is determined by such factors as the external temperature, the oil brand and the duration of its use.

For example, at high temperatures and low oil, it increases its fluidity, and resistance it is reduced to them. With a decrease in temperature, as with a long-term oil, its viscosity increases significantly and leads to an increase in resistance. As a result, the door begins to move slowly and requires adjustment of the closer. This feature of spring closers obliges to timely adjust the speed of the door of at least twice throughout the year.


One of the fundamental signs of the classification of spring models is the installation of the device. In total, three types of devices differ in this criterion.

  • Exterior Closer. Models are designed for top installation and are considered representatives of the budget group of devices. The device consists of two blocks connected by articulated levers, and one of them is mounted on the door, and the second – on the box. All external models are covered with anti-corrosion composition and are highly resistant to extreme temperatures.
  • Device for hidden installation in the door frame. The models suggest the presence in the frame of a special cavity intended for placement of the device. The lever is installed on the top of the door. There are inverse models when the working unit is installed in the door of the door web, and the lever is fixed on the jam. However, due to the complexity of installation, such devices were not widespread.
  • Models for hidden editing in the floor. Closers are intended for heavy canvases and can be used in warehouses and industrial enterprises. In addition, the design of hidden closers allows them to be installed on pendulum doors, which significantly expands the scope of application and allows them to exploit them in public premises and shopping centers.

Criterias of choice

One of the important parameters for which the closer is selected is its power. When calculating it, first of all, oriented on the size and weight of the door canvase. The following selection criteria are the external conditions and intensity of the human flow through the doors. The power of spring closens is regulated by the European standard EN-1154, according to which there is a class dependence on the power: the higher the device class, the higher the high power it has.

For example, for large armored doors it is necessary to choose the models of the highest class EN-7, while the product 3-5 of the class is quite suitable for interroom and entrance cavetons.

However, with the additional impact of external factors, the class should be chosen with a reserve. As such negative factors, a strong side wind blowing bo?Weight part of the year, and big permeability.

In addition, to acquire the closer a little higher than the highest class and in the presence of non-standard canvases. For example, with a weight that corresponds to the third class, but with an altitude of the door of 2.5 meters, you should buy a fourth closer or even the fifth grade. This will ensure the necessary safety margin and will prolong the life of the device. However, if there is no appropriate readings on it, it is not worth purchasing a higher class of closers. This is due to the fact that powerful models installed on a light plastic door or a gate will create a strong accessory load and will cause its fast wear and failure.

The right choice, setup and timely adjustment of the spring closer will noticeably extend the life of the device and make it use by simple and convenient.

In the next video, you are waiting for an overview of the spring bridge “Hercules” from the Luighi Aldeghi brand.

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