Two factors dictate the design of an ideal brace: 1  Joints adjacent to the thumb CMC joint must be excluded to maximize function when wearing the brace; thus a design using three points of pressure cannot be used. 2  The brace must specifically prevent CMC dorsal translation.
Expansion valve. An expansion valve is a valve used for different purposes: Steam engines. A valve used to control the expansion of steam: Expansion valve (steam engine) The best-known of these was the Meyer expansion valve, the invention of Jean-Jacques Meyer.
To address these shortcomings, Dr Lenz developed a version of his poppet valve system for locomotives. This was first applied to an engine on the Oldenburg Railway of Germany in 1907. As first applied to locomotives, the spindles of Lentz valves were arranged vertically.