Extruder Burst Plugs & Rupture Disks

burt plugBurst plugs (rupture disks) relieve overpressure conditions in a sealed fluid system.  This result is similar to the fuse links in an electrical circuit.  Designed as the intentional weak link, they rupture at a predetermined process pressure value (called “burst pressure”), this protects people, products, and machinery.

Dynisco’s BP420 Series burst plug body is made of Series 303 stainless steel.  The internal rupture disk is Inconel, a material that withstands the rigors of plastic extrusion systems.  Available in a range of pressure burst points, threads, and lengths, the BP420 has a 900F/482C maximum temperature rating.  Due to the properties of Inconel, however, rising temperature will have an influence on the actual burst point, which decreases (as a percentage of burst pressure range) as the process temperature increases.

It is important for users to select an appropriate pressure range at the outset.  This is especially so if your process is on the higher end of the pressure and the temperature ranges.