Patent ID: 8220488

Claim:
A combination valve assembly comprising: an outer valve housing defining a conduit therethrough arranged along a first, substantially horizontal axis, the outer valve housing conduit having a diameter, and further defining a chamber arranged along a second, substantially vertical axis; an outer valve closure nested within the outer valve housing and arranged for rotational movement within the outer valve housing around the vertical axis; an inner valve housing nested within and keyed to the outer valve closure; an inner valve closure nested within the inner valve housing and arranged for rotational movement within the inner valve housing around the vertical axis; an outer valve closure mechanism between the outer valve housing and the outer valve closure, wherein the outer valve closure mechanism comprises: an elongate stem defining an axis perpendicular to the first and second axes, the stem penetrating the outer valve housing, the stem defining a worm gear; and a set of gear teeth defined on the outer valve closure for operable engagement with the worm gear.