The present invention relates to improvements in valves of the cartwheel type, with respective arrangements incorporating said valves, which comprise a component of elastomeric material in the form of a cartwheel fastened by means of the external ring to the valve case. The invention comprises a central plug connected by rods to the external ring and, normally, when used in two-way casings (with only one inlet and one outlet), said valve acts as a unidirectional valve. When used in a three-way casing, or a casing with more than three thereof, said valve can act to seal off and let through a flow of fluid on either side of the valve, alternately, depending on the fluid-circulation design choice.La présente invention concerne des améliorations apportées à des valves du type "cartwheel", ainsi que des agencements respectifs incorporant lesdites valves, lesquelles comprennent une pièce de matériau élastomère sous la forme dune roue, qui est fixée par lanneau extérieur à lenveloppe de la valve. Linvention comprend une prise centrale reliée par des tiges à lanneau extérieur et normalement, lors dune utilisation dans des enveloppes à deux voies seulement (entrée et sortie), ladite valve consiste en une valve unidirectionnelle. Lors dune utilisation dans une enveloppe à trois voies ou plus, ladite valve peut assurer une fermeture étanche et le passage dun flux de fluide des deux côtés de la valve, en alternance, selon le choix de conception de circulation des fluides.A presente invenção trata de aperfeiçoamentos em válvulas do tipo "cartwheei", com respectivos arranjos incorporando ditas válvulas, as quais compreendem uma peça de material elastomérico na forma de uma roda de carroça, que é fixada pelo aro externo ao invólucro da válvula. Compreendendo um plugue central ligado por hastes ao aro externo e normalmente quando utilizada em invólucros de apenas duas vias (uma entrada e uma saída), dita válvula constitui-se em uma válvula unidirecional. Quando utilizada em invóluc
