When the pressure increases in pipeline 1, membrane 2 is bent upward, shifting rod 3, lever 4 and jet valve nozzle 5 upward. Lever 4 turns about fixed axis A and jet valve nozzle 5 turns about fixed axis B. Rod 3 and lever 4 have points b and a which slide along lever 4 and jet valve nozzle 5. When the pressure drops in pipeline 1, the elements of the regulator operate in the reverse direction.
$3913$LHP,Rg$