Ball valve for lethal gas or fluid service

Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed

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Details

277523, 25131514, F16K 4104, F16J 1524

Patent

active

059063548

ABSTRACT:
An improved ball valve for lethal gas or fluid service is disclosed having a novel triple redundant stem to bonnet seal design. A ceramic seal ring forms the primary stem to bonnet seal. The ceramic seal ring has a first seal surface lapped for sealing engagement with a corresponding lapped surface on the stem and a second seal surface lapped for sealing engagement with a corresponding lapped surface on the bonnet. The ceramic seal ring first seal surface lapped for sealing engagement with a corresponding lapped surface on said stem and the corresponding lapped surface on the stem may be frustoconically or spherically shaped. An elastomeric seal and a compression type seal between the stem and bonnet act as redundant seals. A preloading means to maintain the ceramic seal ring and lapped sealing surfaces on the bonnet and stem in sealing engagement is shown.

REFERENCES:
patent: 3151837 (1964-10-01), Bentley-Leek
patent: 3216697 (1965-11-01), Holmberg
patent: 3218024 (1965-11-01), Kroekel
patent: 3257095 (1966-06-01), Siver
patent: 3371676 (1968-03-01), Mullaney, III
patent: 3425663 (1969-02-01), Priese
patent: 3586289 (1971-06-01), Priese
patent: 3787060 (1974-01-01), Astill et al.
patent: 4773442 (1988-09-01), Lephilibert
patent: 5192049 (1993-03-01), Ridge
patent: 5407176 (1995-04-01), Nevrekar
patent: 5531244 (1996-07-01), Siver
McCannaseal.RTM. Ball Valves Brochure, Feb. 1997, pp. 1-24.

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