SSV PG1

Bolt Tensioner for recessed bolt threads

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 Tensioner of product group 1 is that the cylinder-piston-set is placed over a recessed bolt thread and that, then, a tension nut is screwed down to the stop face of the piston.

Schraubenspannvorrichtung Grundstellung — 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.

Schraubenspannvorrichtung Kolben — Piston

Schraubenspannvorrichtung Zu spannende Schraube — Bolt to tension

Schraubenspannvorrichtung Tauchmutter — Thread Sleeve

Schraubenspannvorrichtung Zylinder — Cylinder

Schraubenspannvorrichtung Dehnung und Stauchung — 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.

Schraubenspannvorrichtung Hauptmutter — Main Nut

SSV Beidrehen der Hauptmutter — 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.

Bolt Tensioners

Capability to start simultaneous tensioning at multiple points

„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.

Start of tensioning independently of tensioning path

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!

Quickest test capability at any time

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.

Universal application

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.

Saving of time

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 PG1

single-stage
tension nut
for recessed bolt threads
SSV simple to place, thus short set-up times
short spindle path of nut due to recessed tension thread
easy handling because of low weight of tension nut when screwing on and off

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 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.