Patent attributes
A device includes a stem hub attached to a fitting body. A rotatable stem is located at least partially within the stem hub. Rotation of the rotatable stem operates a blocking element located in the fitting body. In an embodiment, an upper stem is coupled to a first end portion of the rotatable stem so that rotation of the upper stem rotates the rotatable stem. A metal seal is located on the stem hub. A portion of the upper stem presses the metal seal between the upper stem and the stem hub when the upper stem is moved towards the stem hub. An operating mechanism moves the upper stem towards the stem hub and away from the stem hub. The upper stem is moved by the operating mechanism in a direction normal to the rotational axis of the rotatable stem and the upper stem.
