Conventional industrial steam turbines are usually equipped with quick-closing inlet valves to realize emergency shutdown of the turbine. In this paper

a negative pressure inlet condensing steam turbine was studied has low inlet parameters

large inlet steam volume flow and small pressure difference between inlet and exhaust steam ends. In order to reduce the intake pressure loss

the quick-closing inlet valves are not employed

but a redundant large-diameter rapid vacuum breaker valve is used at the exhaust end of the turbine. When the turbine needs emergency shutdown

open the quick vacuum breaker valve

so that the atmosphere quickly enters the exhaust end of the turbine

the pressure of the exhaust end of the turbine rapidly rises

In this paper

the steam turbine whose inlet and exhaust steam pressure difference is 40 kPa is studied

and the pressure difference between the inlet end and the exhaust end of the turbine could reach 0 within 4 seconds

so that the turbine is closed

and the purpose of emergency shutdown of the turbine is achieved.