Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1984-11-26
1986-04-01
Scott, Samuel
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251 77, 251160, 251314, 251360, F16K 514
Patent
active
045793166
ABSTRACT:
An arrangement for top entry ball valve, providing relief from seating load when turning the ball to effect either opening or closing of the valve by a handle connected to the ball via a stem. The arrangement including: a nut having an external thread thereon, the nut being secured to the stem by a key to ensure positive rotation of the nut with the stem during the valve opening or closing; a spring operatively engaging the stem to inhibit free rotational movement thereof relative to the valve body; a handle threaded engaging the external thread of the nut; and an abutment on the nut and projecting therefrom and adapted to engage a further abutment on the handle, the further abutment comprising a slot in the handle, the slot being of greater circumferential dimension to that of the nut abutment whereby the nut abutment and further abutment are positionable one to another in spaced relation affording limited and relative rotational movement between the nut and the handle via the engaging threads whereby to impart receptacle movement of the stem relative to the handle and whereupon engagement of the nut abutment would be further handle abutment, the handle imparts rotational movement to the stem and accordingly the ball relative to the valve body.
REFERENCES:
patent: 1857861 (1932-05-01), Nordstrom
patent: 1881953 (1932-10-01), Redding
patent: 2052462 (1936-08-01), Grissett
patent: 2125810 (1938-08-01), Reed
patent: 2559695 (1951-07-01), Allen et al.
patent: 2565244 (1951-08-01), Laurent
patent: 2567032 (1951-09-01), Schmidt
patent: 2705609 (1955-04-01), Prescott
patent: 3656711 (1972-04-01), Toelke
patent: 3685793 (1972-08-01), Szumilas et al.
Kamen Noah
Scott Samuel
Velan Inc.
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