BALL VALVE WITH ARRANGEMENT FOR SEPARATING SEALING SURFACES AND CORRESPONDING METHOD

摘要

The method and the system according to the invention rely on that gas from gas piping (16) , to which a ball valve (17) is installed, is used as working medium. The working medium is delivered from a by-pass pipe Q) connected to gas piping (16) and next by means of a two-way valve (2) and three-way pipe (3) and hole (4) in the body of the ball valve (17) to working chambers (5) . As the result of supply of medium there is retraction of holders (S) with packing rings (10) from the ball closing component (13) , which enables txirning of the ball closing component (13) in the valve after a long time of standstill .