Upon a change in temperature of the medium being regulated, in which bimetallic element 1 is placed, the element actuates the stem of valve spool 2. At this, fluid, delivered under pressure to the valve, is directed to one of the ends of cylinder 3 and moves piston 4. As the piston moves, radiator flap 5, turning about fixed axis A and having fork a that engages pin B of the piston rod, turns and changes the amount of air admitted to the radiator.
$4108$EHP,Rg$