Abstract: Disclosed is a fire-tested butterfly valve having a resilient flexible seat member held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. Also positioned between the housing and the insert is a fusible washer means which has a lower destruction temperature than that of the annular flexible seat. Further, the insert is spring biased toward the fusible washer and valve housing so that when the valve is exposed to fire the fusible washer melts, the insert is biased toward the housing, and as the annular flexible seat is destroyed by heat, an edge of the insert into contact with the butterfly disc to establish a secondary, metal-to-metal, fire resistant seal.

Abstract: Disclosed is a fire-tested butterfly valve having an annular resilient seat member and an annular, flexible metal seat member, both held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. In a first embodiment, a fusible washer with a lower destruction temperature than that of the annular resilient seat is positioned between the resilient seat and the metal seat. In a second embodiment, an integrally formed protrusion on the annular resilient seat contacts the metal seat. In both embodiments, the metal seat is held out of contact with the butterfly disc until exposure to a fire melts the fusible washer or the seat protrusion, at which time the metal seat comes into contact with the disc to establish a secondary, metal-to-metal, fire resistant seal.

Abstract: A reversing valve means for use with a reversible refrigerating cycle system in which a selector valve is actuated by pressure difference in the refrigerant gas and not by any mechanical means such as spring or the like. Said valve means is simple in construction and excellent in durability, enabling sure switchover of a heating cycle to a cooling cycle and vice versa.