Patent ID: 8088339

Claim:
An interchangeable drainage assembly for a cylindrical outlet orifice of one of an enameled chemical reactor having one of a flange type outlet ( 5 ) and a pipe outlet ( 4 ), for attachment to an exterior structure of the orifice, the drainage assembly comprising: a valve ( 8 ) comprising a head ( 10 ) for forming a fluid tight seal with a mating seating piece ( 11 ), the head ( 10 ), when moved into an open position spaced from the seating piece ( 11 ), facilitating drainage of the reactor via an outlet orifice ( 6 ) of the drainage assembly, and the head ( 10 ), when moved into a closed position in abutting engagement with the seating piece ( 11 ) forming a fluid tight seal so as to facilitate retaining a fluid within the reactor and preventing flow through the outlet orifice ( 6 ); the valve ( 8 ), the head ( 10 ), the seating piece ( 11 ) and a mechanical body ( 13 ) forming the drainage assembly; and the seating piece ( 11 ) contacting a planar edge surface of the outlet orifice ( 6 ) forming a planar frontal surface ( 7 ), and the seating piece ( 11 ) being sandwiched between the planar frontal surface ( 7 ) of the reactor and an opposing sandwiching surface ( 12 A) of an upper flanged portion ( 12 ) of the body ( 13 ) of the drainage assembly upon attachment of the drainage assembly to the outlet orifice of the reactor, wherein the seating piece ( 11 ) is removable and is manufactured as a flat annular seal having a central opening ( 25 ) that passes completely through the seating piece ( 11 ), an upper portion of the seating piece ( 11 ), facing the outlet orifice ( 6 ) of the reactor, has a first conical ramp ( 23 ) which surrounds and slopes toward the central opening ( 25 ) and a second conical ramp ( 24 ) which surrounds and slopes toward the first conical ramp ( 23 ), at least a portion of the first conical ramp ( 23 ) engages with a conical surface of the head ( 10 ) when the drainage assembly is in the closed position, to form a completely fluid tight seal therebetween and prevent the flow of fluid through the outlet orifice ( 6 ), and the first seating conical surface ( 23 ) is disposed axially between the planar frontal surface ( 7 ) and the sandwiching surface ( 12 A) of the upper flanged portion ( 12 ).