Accessories for Expansion Joints

Accessories for Expansion Joints

Expansion Joints » Accessories for Expansion Joints

Rubber expansion joint accessories include retaining rings, control units/tie rods, and metal flow liners.

Expansion Joint Control Units - Tie Rods for Expansion Joints
  • Triangular end plates (gussets) have two holes for bolting securely to flange and one hole to accommodate the connecting tie rod. Gusset plates are cut from ASTM A36 Carbon Steel plate.
  • Tie rods are cut from ASTM A193 Grade B7 threaded rod. Each rod incorporates double nuts on each end to keep the expansion joint from over-elongating due to pressure thrust forces.
  • Nuts are ASTM A194 Grade 2H heavy hex nuts.
  • Spherical washers are incorporated to accommodate moderate piping alignments but also assist with angular, torsional and lateral movements.
  • Gusset plates are coated black with a corrosion resistant paint. This is the same coating that is applied to Garlock retaining rings.
  • Tie rods and nuts are clear zinc plated according to ASTM F1941/F1941M, “Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric”.
  • Zinc plating offers improved corrosion resistance resulting in easier adjustments of the control units over time.
Metal Flow Liners for Expansion Joints
  • Designed to extend service life by providing the tube protection from abrasive materials or solids, especially in high-velocity applications.
  • The flow liners are flanged at one end, installed at the head of the flow, and tapered to a 5° angle to allow lateral deflection.​
  • Liner flange thickness: 10 gauge
  • Liner body thickness: 12 gauge
Metal Retaining Rings for Expansion Joints
  • Required for use in all applications, metal retaining rings provide a metal surface to distribute bolting pressure equally, preventing flange damage during bolt tightening.
  • Install against external flange surface
  • Standard material: carbon steel with corrosion-resistant coating
  • Galvanized or stainless steel also available

Expansion Joint Desgin Guide

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