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Ridgeback® Liner Bolt

The Ridgeback™ Liner Bolt is a patented design, superior to standard liner bolts. The Ridgeback™ has several specially shaped ridges that change their shape during installation. These ridges then conform and mold our special bolt head, producing a custom fit to your liner pocket, every time. When installed into your liners, each bolt becomes the “perfect mate” for the liner pocket it is installed into.

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Effective Bolt StabilizationVFB ridgeback-assembly-34078

The Ridgeback™ Liner Bolt was designed by our engineers especially to solve bolting problems that users were encountering when liners were installed.

With standard bolts, there is a 1/8″ all-around clearance between the bolt and the liner; therefore, when the bolt is installed, it rests on two points and is not stable. To stabilize the assembled joint, our engineers designed ridges along the taper section of the bolt to conform to the tapered surface of the liner hole when assembled. These ridges plastically deform during assembly to take the individual shape of the tapered liner seat and bolt seat, creating a solid surface to tighten against.

VFB ridgeback-group-editA correctly seated and tightened assembly does not come looe. This solves problems and saves expensive maintenance hours.

Years of observation, intelligent design, and innovation have brought about our success.

We skillfully manufacture our bolts, giving them their unique molding action, where each one locks securely into its individual liner pocket.

Try a set of our unrivalled Ridgebacks™ on your next installation. There is simply nothing else on the market like it.

 

 

 

 Advantages

  • Holds liners more securely than conventional liner bolts
  • Head shape conforms to liner pocket for a better fit
  • Needs retorqued only once to assure a secure fit
  • Helps prevent costly downtime, increasing profits
  • An upgrade that is priced to compete with standard liner bolts 

VFB ridgeback-34088

Technical

The RidgeBack’s™ bolt head increases contact surface by conforming to the shape of the tapered surface of the liner hole. In conventional liners, the oval radius of the bolt is about 15% less than the oval radius of the liner. These differing geometries lead to only a line contact on either side of the head. Furthermore, any difference between the taper angles of the bolt and liner will reduce the contact area from a line to a point. Small contact area leads to high local stresses which plastically deform when the mill is put in-service. This plastic deformation causes premature loosening and makes frequent retorquing necessary. To solve this problem, as the RidgeBack™ is tightened, projecting ridges plastically deform during assembly, not afterwards, to take the individual shape of the tapered liner seat. By establishing a greater contact surface during assembly, the bolts will maintain preload longer and can eliminate the need for retorquing.

 

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