Bent bellows sealed rotary valve

Details Bent bellows sealed rotary valve Bent bellows sealed rotary valve

1982-03-11

1984-06-05

Chambers, A. Michael

Valves and valve actuation

Hermetic flexible wall seal for actuator

251214, F16K 4110

Patent

active

044524269

ABSTRACT:
A valve body includes a passageway for the flow of fluid therethrough. A valve member, such as a ball valve member, is positioned in the passageway for rotatable movement about a first rotational axis between an open position and a closed position to open and close the passageway. An actuator orbits about the first axis to move the valve member between the open and closed positions. A bent unitary valve stem extends between the valve member and the actuator. A lower end of the unitary valve stem is aligned with the first axis and is connected to the valve member for rotation with the valve member. An upper end of the unitary valve stem is aligned with a second axis angularly displaced from the first axis. A bearing assembly retained in the actuator connects the stem upper end to the actuator. A bellows bent to follow the curvature of the valve stem surrounds the valve stem to form a primary pressure boundary hermetically sealing the valve stem. A housing surrounds the bellows forming a secondary pressure boundary with the handle and accompanying static and dynamic O-ring seals. A lower end of the bellows is connected to the valve body. An upper end of the bellows is connected to the bearing assembly which rotatably supports the bellows in the actuator. The actuator orbits about the first axis to open and close the valve; while the upper end of the bellows rotates about the second axis. Turning the actuator transmits torque through the pressure boundaries without applying torque to the bellows.

REFERENCES:
patent: 1301948 (1919-04-01), Kaplan et al.
patent: 1514968 (1924-11-01), Hull
patent: 2659569 (1953-11-01), Ehlke
patent: 3782685 (1974-01-01), Gallagher et al.
patent: 3811651 (1974-05-01), Gallagher et al.
Manually Operated Bellows Valves Nupro Company, Willoughby, Ohio, 1973.

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