Explanation

The Dynisco Model BP520 burst plugs are custom assemblies with pop-top burst indication that are a design option on extruder barrel assemblies. Burst Plugs (also known as rupture disks) are designed for reliable, emergency relief of excess pressure in a system. The Model BP520 is installed on barrel bodies with hex ends, where the hex OD (across flats) is larger than the burst plug body. The metal retainer strap is held in place by the hex and the metal 'T' shaped cap is fastened to the other end of the strip. A 2mm hole is drilled through the body and cap. A burst indicator wire is passed through the hole and when the disk ruptures, the T-cap 'pops open' shearing off the BI wire and indicating a burst to the control system.