Upon a drop in oil pressure in the turbine lubricating system below the permissible value, piston 1 is moved downward by spring 2, turning lever 3 about fixed axis A. This shifts valve plunger 4 upward, admitting steam into the turbo-pump, which supplies an additional amount of oil to the lubricating system. When the oil pressure increases in the system, piston 1 moves upward, lowering valve plunger 4 and stopping steam supply to the turbo-pump.
$4237$CHP,Rg$