8. Low Oil Pressure Trip
The Turbine is provided with a low oil pressure trip device, to prevent trouble due to failure of bearing oil pressure.
As with the low oil pressure trip, the pressure switch acts when the specified operation pressure is reached, and the solenoid valve is actuated to trip the turbine.
Since the overspeed trip device, excess back pressure trip device and low oil pressure trip device all tested and set in the manufacturer's shop test, never readjust them unless necessary.
9. Sentinel Valve
The sentinel valve is designed so that when exhaust pressure excessively rises, it pushes up the ball, overcoming the compression force of the spring to emit steam, thereby giving an alarm before the excess back pressure trip device to operate.
Its operating pressure can be adjusted by means of the adjust screw.
10. 3-way Solenoid Valve for Remote Trip
To remotely trip the turbine, push the remote trip push button provided in the cargo oil control room to demagnetize the solenoid valve which is provided in the hydraulic circuit let to the trip cylinder of the emergency stop valve.
In normal operation the solenoid valve is in energized state.
While it is energized, the oil circuit from the oil pump to the trip cylinder is opened and drain hole to the oil reservoir is closed. When it is deenergized, the solenoid valve inlet is closed, due to which the drain holes of solenoid valve trip and trip cylinder are opened.
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