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Dispositivo valvular perfeccionado, caracterizado esencialmente porque el mando de accionamiento del vástago que obtura el paso del fluido se ancla con facultad de giro libre sobre el manguito que encierra a la junta de cierre estanco, y porque el antedicho mando comprende un alojamiento a través del cual se acopla directa ente sobre uno de los extremos del vástago que obtura el paso del fluido, de manera que los giros del mando producen los desplaza cientos axiales del repetido vástago obturador, mientras que el mando permanece fijo y sólamente con facultad de giro libre.