High Pressure Relief Devices (HPRD)

An HPRD is a safety device incorporated into an oxygen system, typically in a valve body or other device installed into the
cylinder. It is designed to activate in the event of an over-pressure condition which might arise by either over-filling (i.e., filling
the cylinder to a pressure in excess of it’s pressure rating), or by being subjected to excessive temperature which would
consequently cause an increase in the pressure in the cylinder.