Mounted at the end of stem a of valve spool 4 is roller 8 which rolls and slides in slot b of lever 9. Lever 9 turns about fixed axis A and has at one end fork d in which roller 10 of rod 11 slides and rolls. Rod 11 is attached to piston 2. When the pressure in pipeline 1 increases, piston 2 moves upward and shifts valve spool 4 upward. This connects the upper end of cylinder 5 to the valve into which fluid is delivered. Piston 6 and shutter 7 begin to move downward, reducing the pressure in pipeline 1. When the pressure drops, the elements of the regulator operate in the reverse direction.
$3895$LHP,Rg$