Valve ring arrangements in metallic valves, control valves, condensate removal devices, and other means for the prevention of leakages due to corrosion
AssigneeMarbor Engineering Associates
InventorMarcel Stein
Life of this patent
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Abstract
A valve ring arrangement is disclosed in which the corrosion sensitive parts of shut-off valves, control valves and condensate-removal devices are kept out of contact with condensate accumulations. Also disclosed are float and bucket-type condensate-removal devices which are protected against shutdown corrosion by means of automatically draining them during shutdowns.
Claims18
A shutoff valve for a steam distribution system wherein condensate accumulates as the system is shut down, said valve comprising a valve body with a valve ring boss, a valve ring having a valve ring collar inserted into the valve ring boss, the valve ring and the valve ring boss having interfacing sealing surfaces therebetween which are located above the level of any possible condensate accumulation inside the valve body, the valve ring and the valve ring boss having sloping surfaces all around the interfacing sealing surfaces which together form a monotonically declining continuous mantle, said mantle declining away from the interfacing sealing surfaces to thereby ensure complete drainage of condensate from the sealing surfaces and the mantle.
A control valve for a steam distribution system wherein condensate accumulates as the system is shut down, said control valve comprising a valve body with a valve ring boss, a valve ring inserted into the valve ring boss, the valve ring and the valve ring boss having interfacing sealing surfaces therebetween, said valve ring being inserted from the bottom in such a way that a monotonically declining continuous hollow mantle is formed by the inner perimeter surfaces of the valve ring boss and the valve ring, said mantle declining away from the interfacing sealing surfaces to thereby ensure complete drainage of condensate from the interfacing sealing surfaces and the mantle.
Dependencies are inferred from the claim text.