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Válvula mariposa, c a r a c t e r i z a d a por el hecho de que en el borde, aguas arriba, del manguito o cuerpo que arma la válvula se dispone de un arillo de hermeticidad con borde achaflanado en contrapendiente según la dirección del flujo y que adopta un forro elástico para contactar en correspondencia estanca con la talla perimetral en pendiente, según la misma dirección de flujo, del borde de la placa mariposa, cuyo canto presento un suplemento o forro soldado de acero inoxidable que contactan en plano biselado contra flujo produciendo un cierre estanco y pleno.