Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent
1994-08-09
1996-02-20
Nilson, Robert G.
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
137312, 13763015, F16K 132
Patent
active
054921503
ABSTRACT:
A combination control valve wherein a seal directed towards the valve exterior is achieved by a double gland which straddles a lantern sleeve with an intermediate vent and is pressed axially between the stem and guide for the main valving member by preloaded elastic elements, said guide being held elastically pressed against the differently inclined surface of a shoulder ring retained by circular sectors fitted into the valve body, a series of labyrinths being interposed between said guide and said main valving member, the pilot valving member being of parabolic profile, a bellows elastic seal element being provided between the first seat and the valve body, the trim including a hollow cylindrical structure which is inserted coaxially into an end cavity in the main relying member, is provided with transverse holes arranged offset from corresponding holes in the cavity of the main valving member, and terminates with a parabolic profile.
REFERENCES:
patent: 4022247 (1977-05-01), Schweitzer
patent: 5113902 (1992-05-01), Dorr
patent: 5192049 (1993-03-01), Ridge
Patent Abstracts of Japan, vol. 9, No. 70 (M-367), Mar. 30, 1985, JP-A-59 200 883, Nov. 14, 1984.
Oleodinamica-Pneumatica, vol. 22, Dec. 1981, No. 12, H. Spohr, "Pilota Operativo a 2 vie, Valvole Verticali a 2 Posizioni con Sorveglianza Elettronica, Loro Costruzione e Impieghi", pp. 80-84.
Nilson Robert G.
Nuovopignone-Industrie Meccaniche e Fonderia S.p.A.
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