Temperature-sensitive bleed valve

Claim 1

A temperature-sensitive bleed valve comprising: a. a molded body comprising a circular shell having a floor with a central boss, the boss having a central bore interiorly threaded, the body having a pair of spaced depending ducts, tubes communicating from the outside to the inside of the body, the shell having a first annular shelf spaced above the floor, the shelf having an upward lip at the inward margin thereof, the shell also having a second annular shelf outward and upward from the first annular shelf; b. a blocking plug being threadedly disposed in the opening and extending into the body a pre-set amount; c. an O-ring seal disposed in the first shelf; d. a bimetallic disc disposed in the shell with its periphery sitting on the O-ring seal, the disc having a central bleed opening normally closed by the blocking stud, the center of the disc being adapted to bow outward of the body upon the occurrence of a warm temperature to open the central bleed opening; e. a retaining ring disposed on the second shelf and having a depending annular rib approximately the same diameter as the Oring, the annular rib pressing the periphery of the disc down on the O-ring, the retaining ring being held in position by the inward staking of the upper end of the shell wall.