The Shurjoint Model R20 Butt-Joint Rigid Coupling is a truly rigid grooved pipe coupling which, unlike other grooved couplings, does not allow for any axial movement, angular movement and or rotational movement under normal service conditions. The butt-joint design (patented in Japan) eliminates the gap in between pipe ends to eliminate linear movement which previously had been considered a given in grooved piping systems. Support and hanging requirements correspond to ANSI B31.1, B31.9 and NFPA 13.
The fluid will neither directly contact the rubber gasket nor stay in the gasket pocket as often seen in conventional grooved pipe couplings. No rubber ingredients will leach out into the fluid.
The T&G (tongue & groove) device supported by the Shurjoint precise casting technique provides a metal-to-metal contact of the bolt pads when properly installed. No torque wrench is required for installation.
No special changes are required when processing roll-grooves on the pipe. Standard roll grooves can receive the Model R20 coupling.
Applications:
All piping including mechanical rooms where no angular and axial movement are desired.
Dry-system fire protection pipelines.
Stainless steel piping for potable water and food industries (epoxy coated housings with NSF61 certified gasket and type 316 bolts and silicone bronze nuts).
Hot water systems.
Caution: Pipe end shall be cut square so that pipe ends come to butt together.
