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Una aceitera perfeccionada, caracterizada por que en el interior del cilindro de la bomba de inyección puede deslizar un conjunto unitario de una sola pieza de vástago y émbolo, que recibe la acción antagonista de un resorte apoyado en una jaula perforada inferior, que contiene un resorte y la válvula de bola de entrada, pudiendo pasar el aceite a través de dicha jaula hacia el interior del cilindro, y hacia la salida, pasando a través de una válvula de asiento cónico con muelle antagonista unido al vástago.