Two-Piece Back-Up Flange Promotes Efficiency, Provides Strength

The Marzolf™ two-piece, back-up flanges utilize a half-ring design with multiple offsetting laminae with complementary male and female ends on each half-ring. These half-rings (two-piece flange) slide together and interlock, creating the rigidity equal to one-piece rings and share common bolt holes, dispersing bolting pressure to provide a uniform seal. This two-piece back-up flange design was invented by George B. Marzolf, Sr. in 1955 and he patented this unique two-piece flange in 1959.

Marzolf™ two-piece, back-up flanges is an effective substitute to a plastic pipe flange, steel flange, stainless steel flange, and various other materials. The two-piece, back-up flanges are ideal alternatives to standard lap joint of Van Stone style flanges.  The two-piece flange eliminates the problem of cutting off and re-welding stub ends, allowing for permanent replacement of failed one-piece rings.

The two-piece, back-up flanges come in standard stock sizes or can be custom made or modified for non-standard dimensions or unique materials.

Marzolf can respond immediately with standard or custom fabricated plastic pipe flange, steel flange, or other material products from our manufacturing facility in River Falls, Wisconsin (USA).