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Sir what is relation between servomotor and ESV used in steturbine??

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The emergency stop valve (ESV) in a turbine is equipped with a hydraulic servo motor, which is responsible for opening the valve against the force of a spring. The servo motor comprises a power piston enclosed within a positioning cylinder. When oil is pumped into the cylinder, the piston moves linearly and opens the valve by pressing against the spring and compressing it. This allows steam to be admitted into the steam chest and for it to flow towards the ESV actuator. The ESV is an on-off valve, meaning that it must be fully open or fully closed at any given time. The trip oil is used to overcome the spring action of the ESV, and a malfunction of the trip oil pressure switch can lead to the turbine getting tripped. Therefore, the relation between the servo motor and ESV in a turbine is crucial for the control and safety of the turbine operation 1 . The servo motor is an essential component of the ESV actuator, responsible for opening the valve against the force of a spring. It plays a critical role in the control and safety of the turbine operation, ensuring the proper flow of steam and the ability to stop the turbine in emergency situations.

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Sir in steam turbine why both front and rear side lubrication applied??

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Steam turbines require lubrication to operate efficiently and minimize friction while carrying heat away from thrust and bearings 1 . Lubrication is critical to supporting optimal steam turbine performance, and selecting an inadequate lubricant can have expensive consequences 2 . Both sides of the steam turbine require lubrication, and the lubrication system consists of a lube oil tank, oil pump, filter, cooler, pressure regulating valve, and other components 3 . Small turbines use oil flood lubrication, while larger turbines use pressurized lubrication 4 . LP turbines that have double flow setup are primarily used to equalize the thrust load from the opposing turbines, which minimizes the size of the thrust bearings that the LP turbine requires 5 . The lubrication oil system is critical for normal operation, and failure of either the gearbox or turbine will result in a total failure of the unit