METHOD AND HYDRAULIC CYLINDER FOR SEALING LENGTHY POROUS BODIES

摘要

A method for sealing lengthy porous bodies moving between zones of different pressures where a porous body (T) while moving between the zones of different pressures (P1, P2) is passed through a sealing substance (M) under pressure. A substance with thixotropic properties, used as the sealing substance, is continuously fed to the porous body (T) under a pressure higher than that in the zone (P1) of high pressure, whereas the porous body (T) is impregnated with the thixotropic sealing substance (M) so that its cross-section is filled up, on its whole length, by the sealing substance. A hydraulic cylinder on the basis of the method comprises a chamber (7) filled with a visco-elastoplastic substance and connected to a means of creating a pressure inside it which is higher than that of the working fluid filling the space inside the casing of the cylinder.