RECIPROCATING DRIVES FOR THE MOVABLE MEMBERS OF SHUT-OFF ELEMENTS

摘要

A reciprocating drive for the movable member of shut-off element wherein the driving element 2 made in the form of at least one wire turn heated by a source of electric current and resting on two supports 3, 4 one of which (3) is secured in the body 1 while the second one (4), connected with the movable member, moves when the driving element 2 is elongated due to heating. The second support 4 is fastened to one end of the spring-loaded part 5 whose other end is secured in the body 1. Such an installation of the second support makes it possible to increase several times the travel of the movable member as compared to the elongation of the driving element due to heating.