Valve assemblies are provided which comprise a housing having a common port and n peripheral ports, where n is an even integer greater than or equal to 4. The valve assemblies further comprise a valve plug contained within the housing. The valve plug comprises a distribution channel capable of fluid...http://www.google.fr/patents/US5105851?utm_source=gb-gplus-shareBrevet US5105851 - Apparatus for multi-path flow regulation
