Abstract: To achieve a compactly designed, simple and robust control valve for a hydrodynamic torque generator which is linear over a wide adjustment range, the control channel (12) of the control valve is formed in such a way that a substantially linear relationship between valve position (?) and flow ({dot over (V)}) is achieved by rotating the valve body (6) between a first valve position (?1), which differs from the closed position, and a second valve position (?2) with a larger flow ({dot over (V)}) than in the first position (?1).

Abstract: Jewelry includes a stone which defines a crown, a pavilion and a girdle therebetween, the girdle having a 360° peripheral groove crown thereinto. A flexible wire has a first portion at least partially disposed within the groove and extending at least 90° (preferably at least 180°) about the stone, the mounting and the wire being secured together, thereby to secure together the stone and the mounting.

Abstract: Jewelry includes a stone which defines a crown, a pavilion and a girdle therebetween, the girdle having a 360° peripheral groove crown thereinto. A flexible wire has a first portion at least partially disposed within the groove and extending at least 90° (preferably at least 180°) about the stone, and means securing together the mounting and the wire, thereby to secure together the stone and the mounting.