Pneumatic pressure relief test plug

A pneumatic test plug for use with a pipe having a generally cylindrical internal pipe wall, the pneumatic test plug comprising:

• an inflatable bladder formed by a bladder wall that is elastically deformable, the bladder wall having at least one open end;
• a housing disposed in the open end of the bladder wall, the housing having a mounting surface;
• and
• an inflation valve mounted to the mounting surface, the inflation valve having an interior end in fluid communication with an interior area of the bladder, the inflation valve defining a main air passageway through which air is introduced into the interior area;
• wherein the mounting surface is recessed into the interior area of the bladder relative to the open end in the bladder wall such that the housing defines a recessed valve cavity within the inflatable bladder,
• wherein a majority of the inflation valve is disposed within the recessed valve cavity of the housing,
• wherein the inflation valve further comprises a stem portion configured to engage the mounting surface, a pressure release opening, and a sleeve disposed about the stem portion,
• wherein the stem portion passes through an entire length of the sleeve, and
• wherein, with the exception of the pressure release opening, an entire inner surface of the sleeve contacts an outer diameter of the stem portion.