Bolt tensioners are essential tools used in industrial applications for applying accurate and consistent tension to bolts. The SL-TA Self-resetting bolt tensioner and SL-GT Hydraulic bolt tensioner are two specific types within this category. The SL-TA Self-resetting bolt tensioner is designed to automatically reset after each use, making it efficient and convenient for repetitive tensioning tasks. On the other hand, the SL-GT Hydraulic bolt tensioner utilizes hydraulic pressure to apply precise tension, ideal for applications where accuracy is paramount. Both types offer reliable and efficient solutions for achieving proper bolt tension in various industrial settings.

SL-TA Self-resetting Bolt Tensioner

The working principle of bolt stretcher is mainly based on hydraulic transmission, using the Pascal principle to transfer energy. twelve
The bolt stretcher applies direct external force to the bolt through a hydraulic cylinder, causing it to be stretched within the elastic deformation zone. This stretching causes slight deformation of the bolt diameter, making it easier for the nut to loosen. During the operation, the design of the hydraulic tensioner allows multiple bolts to be tightened and disassembled at fixed values simultaneously, ensuring even force distribution. This method is not affected by bolt lubrication and thread friction, thus providing more accurate bolt load control.
In addition, the design of hydraulic stretchers also takes into account the requirements of usage space and bolt exposed length to ensure correct use. When using, it is necessary to calculate the set tensile force based on the pre tightening force requirements of the bolt and ensure that it does not exceed the allowable stress of the bolt. For multiple bolts on the flange surface, it may be necessary to stretch them in stages and in order to avoid uneven tensile force between bolts.

SL-TB Hydraulic Bolt Tensioner

Bolt tensioner generally consists of hydraulic pump, high pressure hose, pressure gauge and tension body. Among them, the hydraulic pump is the power source, the pressure gauge reflects the output pressure of the pump, the high-pressure hose connects the hydraulic pump and the stretching body. Tension body is to achieve the bolt stretching of the executive element. Mainly by the piston cylinder, piston, support bridge and stretching nut composition.When working, the high-pressure oil output from the power source is transported to the piston cylinder through the high-pressure hose, and the piston in the piston cylinder moves up under the pressure, driving the stretching nut to move upwards. The stretching nut is threaded with the working bolt, so as to elongate the working bolt, so that the bolt elongation reaches the required deformation, the deformation is controlled within the range of elastic deformation, and then carry out pre-tensioning or dismantling operations, and finally make the working bolt return to its original shape by means of hydraulic or mechanical return to the original shape to complete the operation.

SL-GT Hydraulic Bolt Tensioner

Bolt tensioner is a special tool for tightening or dismantling bolts using hydraulic principle.
By stretching the bolt, it is elongated within the elastic deformation zone and the bolt diameter is slightly deformed so that the nut can be easily loosened or tightened. In addition, it can be used as a device for applying axial force to hydraulic interference connections for top pressure installation.
The operating principle of the bolt tensioner is based on the tensile strength, yield coefficient and elongation of the material. When working, the power source (such as hydraulic pump) output of high-pressure oil through the high-pressure hose delivery to the tensioner’s piston cylinder, under the pressure of the piston in the piston cylinder piston upward, driven by the stretching nut upward movement. The stretching nut is threaded with the working bolt, thus elongating the working bolt, so that the bolt elongation reaches the required amount of deformation (deformation control in the elastic deformation range). Then pre-tensioning or dismantling is carried out, and finally the working bolt is returned to its original shape by means of hydraulic or mechanical return to its original position to complete the operation.

SL-TD Single-Stage Low Profile Tensioner

SL-TD single stage low stretcher series.
A broad range of single stage hydraulic bolt tensioners designed for critical fastening applications in wind, steam and gas turbines.

Single stage bolt tensioners are ideal for applications that are vertically limited. They provide a large amount of stroke in a vertically compact package.

SL-HT Wind Turbine Tensioners

Hydraulic tensioning is the ideal method for tightening bolted connections. Hydraulic tensioning eliminates inaccuracies and helps achieve correct bolt loading in critical connections. At SOLY, we’ve been building hydraulic tensioners and nuts since 2007.

The SL-HT tensioners are a purpose designed range of tools to suit all applications in wind turbine manufacturing and operations. These tensioners offer a reliable and consistent method of simultaneously tensioning multiple joints and have an integrated fail safe design to enhance workplace safety.

Designed for special needs such as small space, large load, long life and fast speed, meeting ENISO898:1999 standards;

SL-HS Two-stage Bolt Tensioners

Two-stage Bolt Tensioners is a hydraulic tool mainly used for tightening and removing bolts. It is supplied with a hydraulic source through a hydraulic pump and uses the tensile force generated by the ultra-high pressure oil pump to elongate the bolt within the elastic deformation zone so that the nut can be easily loosened. Bolt tensioners are widely used in a number of fields, including petrochemical, nuclear, wind, hydropower, thermal power, marine, railway, aerospace, mining and heavy machinery.
Tensile force range: 200-6640KN.
Applicable bolts: M20-M160.
Maximum working pressure: 150MPa 1500Bar.