The working fluid is admitted into the system through flow-control valve 6 and is delivered to nozzle 3. When the temperature of the item being controlled increases, thermoelement 1 moves shutter 2 toward nozzle 3, thereby increasing the pressure acting on membrane 5. This moves rod 4, rigidly attached to the membrane, downward, reducing the supply of heat-carrying agent to the system and, consequently, the temperature of the item being controlled. When the temperature drops, the elements of the regulator operate in the reverse direction. Rod 4 has pin a which slides in fork b of lever 7, turning about fixed axis A. Weight 8 can be adjusted a long the axis of lever 7 to regulate the pressure on membrane 5.
$3900$LHP,Rg$