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Válvula perfeccionada, caracterizada esencialmente por el hecho de comprender en el terminal del eje del husillo una esfera que asienta en cavidad adecuada prevista en el elemento de válvula, que comprende a su vez un anillo que se solidariza a este, cuyo anillo realiza la sujeción de la esfera en asiento, presentando un ligero huelgo con respecto al eje citado que permite el juego del conjunto anillo y elemento de válvula sobre la esfera, actuando ésta a modo de rótula, y facilitando el asiento adecuado de las juntas de cierre, propias del elemento de válvula y de la zona de asiento inferior.