F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/52
F16K 5/20 (2006.01) F16K 5/06 (2006.01)
Patent
CA 1222737
ABSTRACT OF THE DISCLOSURE: A ball valve with an emergency sealing device is char- acterized by rotatably mounting a ball having a through hole within a valve body; interposing ball seat retainers between the valve body and the ball; attaching ball seats, made of a combustible or fusible material and brought into sealing contact with the ball surface, one each to the ball seat retainers; attaching sealing rings, made of a combustible or fusible material and functioning under normal conditions, one each to portions of contact between the ball seat re- tainers and the valve body; forming annular projection sur- faces one each integrally with parts of the outer circum- ferences of the ball seat retainers; attaching sealing rings, made of an incombustible, infusible, flexible material and functioning in case of emergency, one each to portions of contact between the annular projection surfaces of the ball seat retainers and the inner circumference of the valve body through pressing mechanisms; and forming the diameter of the sealing rings functioning in case of emergency to be larger than that of the sealing rings functioning under normal conditions.
442359
Kitz Corporation
Macrae & Co.
LandOfFree
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