Ball valve

Valves and valve actuation – With means to increase head and seat contact pressure – Spring

Patent

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Details

251259, 251288, F16K 2500

Patent

active

039853357

ABSTRACT:
This invention relates to a ball type shut off valve. The valve includes a body having a flow passage therethrough defining a seat. A ball is loosely held within the flow passageway by the two ends of a shaped, flat strip spring which is held in a longitudinal diametral slot, in a cylindrical shaft positioned in and sealed to the body, with the axis of the shaft at right angles to the longitudinal axis of the body, and to the flow path of the fluid. Rotation of the shaft causes the strip spring to rotate and to control the position of the ball relative to the seat. Rotation in one direction causes a first end of the spring to move the ball away from the seat. Rotation of the shaft and the spring in the other direction causes the second end of the spring to move onto the sea and to hold the ball against the seat by the compliance of the second end of the spring. The resilience of the spring is used in such a way that the pressure holding the ball against the seat is independent of the precise angular rotation of the shaft and is limited only by the spring construction itself.

REFERENCES:
patent: 2650059 (1953-08-01), Hjulian
patent: 3368790 (1968-02-01), Burke
patent: 3403886 (1968-10-01), Barker
patent: 3572370 (1971-03-01), Engle

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