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.
â¢ Industrial oil transfer tanks. Invented by the founder of Cim-Tek Filtration in 1956, A. Richard Ayers spent two years on research and development of the Pre-Vent in an effort to meet the demands for conservation and the environment. The pressure cap valve on the Pre-Vent opens to reduce pressure, while the vacuum release opens when the tank cools.