Grooved Technology Explained

Grooved End Pipe Joining, or the “grooved” concept as it is known today, was born in 1925 when Victaulic designed the first mechanical pipe joint to successfully use a mechanical coupling combined with grooved pipe ends to join piping systems. The first grooved coupling was named the Victory Joint.  Later, the name Victory Joint was joined with Hydraulic to create Victaulic. Victory + Hydraulic = Victaulic


Grooved couplings are comprised of four elements:

  • the grooved pipe
  • the gasket
  • coupling housing
  • the nuts and bolts

Grooved Couplings & grooved fittings

How do grooved couplings work?

The groove is made by cold forming or machining a groove into the end of a pipe. A gasket encompassed by the coupling housing is wrapped around the two pipe ends, and the key sections of the coupling housing engage the grooves. The bolts and nuts are tightened with a socket wrench or impact wrench. In the installed state, the coupling housing encases the gasket and engages the grooves around the circumference of the pipe to create a leak-tight seal in a self-restrained pipe joint.


There are two basic grooved couplings styles:

  • Flexible grooved couplings- allow a limited amount of angular movement
  • Rigid grooved couplings- do not allow movement and can be used wherever immobility in the pipe joint is needed, similar to a flanged or welded joint.


Today you will find grooved couplings, grooved fittings, grooved valves and grooved accessories (such as strainers and suction diffuseres) used in an endless number of piping applications worldwide.

While the grooved pipe joining concept has become synonymous with faster and easier installations, not all manufacturers of grooved products are the same. There is only one Victaulic.


Interested in learning more?


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