ExpaTen
The optimal connection
Free from backlash – Powerful – Reusable
SCHAAF is leading the way with ExpaTen bolts in order to revolutionize detachable flange connections of propulsion shafts of the shipbuilding industry. Not only are the bolts 100% non-positive and form fitting, which transfers high torque, but even after high stress they can be easily disassembled and reused. The bending and rotating resistant connection absorbed shock like changes of revolutions, torque as well as turning direction dependently. The system is made of heat treated steel, which is a safety plus during torque transfer. The safety factor in comparison to regular screws is 5. ExpaTen is easy to handle since all tools and hydraulic high-pressure pumps for assembly and disassembly are adjusted to the system. ExpaTen is certified by well-known buyers.
Expa = Expansion = 100% positive locking in the flange bore Ten = Tension = frictional connection for the joint
Pressure connection bore
to press out the Tapered Bolt.
Tapered Bolt made of high-strength quenched and tempered steel
to absorb radial shear forces and a high axial pre-tensioning force
SCHAAF Bolt Tensioner (SSV)
) up to 4000 bar hydraulic pressure.
Positioning ring to hold the Conical Sleeve
in position while the Tapered Bolt is being pulled into the Conical Sleeve. This results in expansion (Expa) of the sleeve and produces a press fit in the bore
Guaranteed reusability
y even after years of use. Again and again.
Pressure distribution grooves on the taper
to allow easy removal even after years of use.
Conical Sleeve
of high tensile and ductile steel for maximum shear strength.
Two Round Nuts and Tapered Bolt
with ultrahigh-strength material for maximum fatigue strength.
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Advantages
Expansion and pretensioning result in the following advantages compared to conventional bolts:
- 100% positive locking and frictional connection all the time after mounting, no slipping between the flanges
- Simple and quick installation and removal of ExpaTen even after years of use – nearly unlimited times
- Reusable after removal, again and again – no sparebolts required
- Torsionally and flexurally rigid connection even with sudden changes in the rotational speed, the torque, direction of rotation or direction of load
- No jammed or oversized bolts any longer
- High torque transmission, completely free from backlash
- Reduction of flange dimensions possible due to fewer number of bolts
- Maximum torque and shear force transmission in minimum space
- Tolerance for mounting is 0.05 to 0.2 % of the bore diameter
- Simply machinering of the flange holes is sufficent
- Additional standard bolts can be tightened with the same Bolt Tensioner
Overview ExpaTen
Quick form and force fit connections with detachable axial tensioning system (Quick Locking).
Optimal flange connection in case of non-aligned flange bores and / or bore diameters that are not the same.
Versions
The standard version of the SCHAAF ExpaTen comprises the following components:
- Tapered Bolt and Conical Sleeve of high-strength quenched and tempered steel for maximum shear strength and axial load capacity
- Two ultra-high-strength Round Nuts
- Fine thread for maximum fatigue strength
- Pressure connection bore and pressure distribution grooves on the taper for easy removal of the Tapered Bolt
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Areas of Application
SCHAAF ExpaTen Bolts are the optimum solution wherever high forces (torques) must be transmitted and, at the same time, easy removal must be ensured. For example ship drive shafts, powerplants, crushers, steel
and non steel mills and windturbines.
Quality Assurance
All ExpaTen Bolts are checked for material quality, dimensional accuracy, correct functioning and load-resistance. During order execution, they are subject to continuous quality assurance measures and are supplied together with detailed technical documentation.
Services
ExpaTen Bolts are, of course, supplied packaged, ready
for installation and use.
SCHAAF ExpaTen Bolts are user-friendly, reliable, and manufactured in accordance with the highest level of technical know-how. Our highly-motivated
staff would be pleased to train your personnel, in situ or at our works, in mounting and dismantling the bolts.
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