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Válvula, que se caracteriza, esencialmente, por que el vástago desplazable de la misma posee una zona de mayor diámetro, provista de un fileteado exterior roscado al fileteado interior del cuerpo de la válvula, quedando a ambos extremos de la citada zona dos espacios cerrados por sus extremos mediante los oportunos manguitos y arandelas y comprendidos en el interior del cuerpo de válvula, cuyos espacios constituye sendos depósitos de lubrificante, quedando ambos comunicados por una serie de taladros practicados en el ensanchamiento citado paralelamente al eje del vástago.