SSV PG6
Bolt Tensioner with immersion nut (puller)
Cost-reducing - Powerful - Reusable
Bolt Tensioners can be removed from the bolt connection after pre-tensioning:
in comparison, Hydraulic Nuts remain on the bolt or component connection.
The distinguishing feature of the Bolt Tensioners of product group 6 is that a tension bolt and a tension nut transmit the pretensioning force to the bolt to be pretensioned. In most cases it is of multistage design, i.e., several cylinder-piston-units are placed one behind the other.
Basic position
Place the SSV onto the bolt to be tensioned and screw the Thread Sleeve down to the Piston surface. A hydraulic high-pressure pump, through a flexible hose, feeds oil into the space between Cylinder and Piston. The hydraulic pressure increases.
Piston
Bolt to tension
Thread Sleeve
Cylinder
Elongation and compression
As the hydraulic pressure increases, the resulting axial force elongates the Bolt and compresses the flanges. Thus, the Main nut lifts from the flange. On reaching the desired tension, pressurizing is stopped.
Main Nut
Positioning of the Main nut
The tensioning force is achieved and the Main nut can be turned down to contact the flange. When releasing the oil pressure, the desired tensioning force remains in the bolt connection. After removing the SSV, you may use the equipment for tensioning other bolts.
Advantages
Bolt Tensioners
„Crossover-tightening“ of several bolts at several points is no longer necessary, since SCHAAF SSV and HM offer the possibility of tightening all the bolt connections simultaneously with exactly the same tensioning force. This also applies when increasing the tensioning force.
As opposed to thermal screw starting procedures, SCHAAF SSV and HM make it possible to eliminate different gaps between individual components. Each bolt can be tensioned with exactly the same force and not over the same distance!
SCHAAF SSV and HM make it possible to apply a residual tensioning force by means of test force stress application in order to determine if any settling of the screw may occur, and if so, to eliminate it.
With a compact unit and the ability to interchange the component parts relating to the size of the bolt, SCHAAF SSV can also be used for other thread sizes.
SSV and HM will dramatically save time required for tensioning applications. This effect increases for higher tensioning forces, larger bolt thread diameters and also the installation of several SCHAAF SSV or HM. Time savings up to 99% are possible! It is no longer necessary to apply large torque by hand. There is a number of handling features available, designed to make work easier with SCHAAF Bolt Tensioners and Hydraulic Nuts, especially when it comes to large dimensions.
Features SSV PG6
- single- or multi-stage
- lengthened bolt for continuous or recessed bolt threads
- short thread overhang of bolt
- maximum pre-tensioning force at smallest outer diameter
- can be used for other thread sizes, by replacing components, which depend on thread size
More Bolt Tensioners
Bolt Tensioner for recessed bolt threads
Bolt Tensioner for continuous bolt threads
Bolt Tensioner with immersion nut (puller)
Bolt Tensioner for recessed bolt threads with tension thread directly in the piston
Bolt Tensioner for recessed bolt threads with tension thread directly in the piston
Bolt Tensioner with lengthened bolt for continuous or recessed bolt threads
Bolt Tensioner with a multistage cylinder-piston-set
Bolt Tensioner as ring segment for simultaneous pressurisation of all SSV
Versions
In addition to a number of standardized Bolt Tensioners and Hydraulic Nuts, SCHAAF has already delivered thousands of customized axial Bolt Tensioners. The Design on Demand CAD system allows to realize customer solutions very quickly. Based on axial pre-tensioning technics, a number of patented, specialized solutions have been developed during the last years. Bolt Tensioners, Hydraulic Nuts and ExpaTen, as well as the A-Loc and EcoRolls, both developed especially for rolling mills, all represent a 100% system solution with SCHAAF’s accessories such as high-pressure hoses and high-pressure generators.
Areas of Application
The application areas for Bolt Tensioners and Hydraulic Nuts are unlimited. The great amount of user solutions have resulted in a great number of various designs. For this reason it is not always possible to classify all Bolt Tensioners and Hydraulic Nuts into a specific product group. For example, the tensioning force can be transmitted by a thread or a bayonet. Please contact us for your special application.
Quality Assurance
All Bolt Tensioning Tools and Hydraulic Nuts are checked for material quality, dimensional accuracy, proper operation, and pressure resistance. They are subject to quality assurance measures during order execution and delivered with detailed documentation.
Services
SSV and HM are, of course, delivered packaged, ready for installation and operation.
SCHAAF SSV and HM are user-friendly, reliable and are manufactured in accordance with the highest level of technical know-how. Our highly-motivated
staff will be pleased to train your personnel, in situ or at our works, in the general handling of high-pressure equipment.
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