Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1997-10-20
1999-02-09
Fox, John
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251205, F16K 1228
Patent
active
058683763
ABSTRACT:
A proportioning mechanism for controlling a gravitational discharge of flowable material through a passage formed of a sealing material. The mechanism includes a rotatable flap valve mounted in the passage for movement in a first range of movement while in contact with the sealing material, and a second range of movement while out of contact with the sealing material. In the second range, a free flow of material is established. The free flow is terminated when only a small amount of material is yet to be discharged in order to achieve the desired discharge weight. At that time, the flap valve is rotated to a position in contact with a flexible portion of the sealing material. Fluid pressure in a cavity situated adjacent that flexible portion is varied to oscillate the flexible portion into and out of contact with the flap valve. When the flexible portion is out of contact with the flap valve, a gap is formed which admits passage of a small amount of material.
REFERENCES:
patent: 1813126 (1931-07-01), Sheppard
patent: 4138090 (1979-02-01), Summer et al.
patent: 5540266 (1996-07-01), Grau et al.
Koch Martin
Untch Gunter
Fox John
GEI GmbH
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