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
Watch next BEST PRESENT FOR NAZ GETS A SURPRISE https://youtu.be/JW8AcMY_IW0 5 DIFFERENT LOOKS https://youtu.be/xauFqSnCF68 LAST TO LEAVE BATHROOM https://youtu.be/ZJ6F89KsQrg 4 KIDS SPEND $2000 https://youtu.be/7n7Esee_TII Watch all to be a LEGEND
COMMENT here on our community tab https://bit.ly/NORRISNUTSCOMMENTS
Our Latest challenges here https://youtu.be/7VNvxbEN1sI
#kidschallenge #spelling #norrisnuts
In this video we find out which Norris Nut can use the letters in the challenge to spell a word. Whatever the Norris Nuts can spell out of the alphabet letters then the parents will buy for them. Sabre will want to shop for something fancy and Sockie will want something comfortable to buy from the shopping mall but they will all want to use this spelling challenge to eat food! Will it be Sabre, Sockie, Biggy or Naz team who wins? There is not a cash prize of $1000 time -just spelling the presents and gift is enough reward don’t you think for the kids!
Check out our other channels here
NORRIS NUTS GAMING https://bit.ly/NORRISNUTSGAMING
MAIN CHANNEL https://bit.ly/NORRISNUTS
NORRIS NUTS DO STUFF https://bit.ly/NORRISNUTSDOSTUFF
NORRIS NUTS SQUAD (adventures) https://bit.ly/NORRISNUTSSQUAD
Our MOST POPULAR VIDEOS HERE https://www.youtube.com/playlist?list=PL92HrKDrbQZ1ljDSJdh-sQb10oYb_OsoS
*Comment on our Community Tab on the Channel Page
MAKE CLOSED CAPTIONS (subtitles) in your language here https://www.youtube.com/timedtext_cs_panel?c=UCYd0us2OtW4d4-1cfpT2ktw&tab=2