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With a Bolt Tensioner (SSV), bolts are axially preloaded without torquing using high-pressure hydraulic. Axial tension force has been attained by using SCHAAF SSV for bolts with a thread diameter from 8 mm to over 800 mm.
SCHAAF Bolt Tensioners are distinguished into eight different product groups (PG) (designs) which, in principle, all have the same function.
BOLT TENSIONER (SSV) PG 4
The distinguishing feature of the Bolt Tensioners of product group 4 is that the pulling thread is part of the piston itself. The cylinder-piston-set is screwed immediately onto the continuous bolt thread.
Main features
• Single-stage
• Thread in piston
• For continuous bolt threads
Advantages
• Cheapest SSV
• Short thread overhang of bolt
• Small outer diameter of SSV
• Low height of SSV
Conditions
• Use limited to one thread size
• Whole SSV must be screwed on
• Pressure connector rotates with SSV
Examples of application
• Where bolts with one thread size should be tensioned at the lowest cost
• Transmission construction
• Press construction
FUNCTION OF A BOLT TENSIONER (SSV) PG 4 IN SIMPLIFIED RESPRESENTATION
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.
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.
Bolt Tensioners can be removed from the bolt connection after pre-tensioning.
FIELDS OF APPLICATION
• General mechanical engineering
• Metal industry
• Structural and civil engineering, mining, research technology
• Refineries, chemical industry
• Powerplant technology
• Ship engine engineering, shipbuilding, onshore / offshore
THE ADVANTAGES OF GENERATING PURE AXIAL PRE-TENSION USING PRESSURES UP TO 4000 BAR
• Torsion-free generation of tension force – economical use of bolt material capacity
• Maximum accuracy
• Increased safety
• Non-friction tensioning force application
• Capability to start simultaneous tensioning at multiple points
• Start of tensioning independently of tensioning path
• Quickest test capability at any time
• Universal application
• Saving of time
STANDARD FEATURES
• Components as per product group specification (cylinder, piston, etc.)
• High-solidity, steel-surface treated
• Hydraulic pressure as a function of pre-tensioning force
• Sealing set for temperature range from -30° C to +100° C
• Connection thread
• Stroke based on thread size and screw geometry
• Stroke indicator
• Piston return stroke boring
• Support sleeve with window for turning the main nut with a setting rod (SSV)
• Support sleeve opening for main nut contact to flange control (SSV)
ACCESSORIES MANUFACTURED BY SCHAAF
• Mounting aids such as locating pin and end attachments, or as requested by the customer
• Turning devices
• High-pressure hydraulic hoses
• Couplings, nipples, adapters, distributor blocks up to 4000 bar
• High-pressure generators: manually operated, electric, or air-operated
• Different types of hydraulic oil
SPECIAL SOLUTIONS
It is not always possible to classify all Bolt Tensioners into a specific product group. Please contact us for your special application. In addition to a number of standardized Bolt Tensioners, SCHAAF has already delivered thousands of customized axial Bolt Tensioners. The Design on Demand CAD system allows to realize customer solutions very quickly.
MORE INFORMATION
PDF brochure: https://schaaf-gmbh.com/media/_Englisch_Werbematerial/Single_brochures_and_Sheets/02_Bolt_Tensioning/SCHAAF_02,00-Bolt_Tensioning_GB.pdf
CONTACT
SCHAAF GmbH & Co. KG
Bruesseler Allee 22
41812 Erkelenz
Germany
Telephone: +49 2431 9 77 70 0
Telefax: +49 2431 9 77 70 77
E-Mail: info@schaaf-gmbh.com
Internet: https://www.schaaf-gmbh.com