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Priority to ES91534UpriorityCriticalpatent/ES91534Y/en
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Publication of ES91534YpublicationCriticalpatent/ES91534Y/en
Directional drive variable, which is characterized, essentially, by consisting of two mutually displaceable coaxial parts, so that in the inner part there is a one-way valve, whose closing point is threaded by an annular zone, external to the inner part, surrounded in turn, completely by the outer part or sleeve, whose area is communicated with the internal hollow of the internal part on either side of the internal valve. (Machine-translation by Google Translate, not legally binding)