Upon a reduction in thermal load, the pressure increases in the extraction chamber of the turbine and actuates the membrane of pressure regulator 1, bending it upward. This turns lever 2 about point A of the sleeve of centrifugal governor 3. The spool of valve 4 is shifted upward, and that of valve 5, downward. Fluid delivered through the bodies of the valves to the servomotors moves pistons 6 and 7. This closes valve 8 of the high-pressure cylinder (HPC) to some extent, and opens low-pressure valve 9. Thus, less steam is supplied to the extraction chamber, and the low-pressure cylinder (LPC) 11 uses more steam, also reducing the amount of steam in the extraction chamber. By means of common feedback lever 10, each servomotor moves the bodies of both valves, so that the valve spools block off their ports. A similar process takes place upon a change in turbine shaft speed and operation of the centrifugal governor 3, only the spools of valves 4 and 5 shift in the same direction.
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