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
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.
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.