How to close the throttle valve and extraction valve of the turbine after jumping out of the vehicle
Thread Content
If what is shown is Mitsubishi Heavy Industries’ turbine control system, I have the following questions: 1. After a trip, why does the yellow oil discharge line, which is the third one from the left on the emergency safety device, lead to the speed control valve? What is its function? 2. After a trip, since the two solenoid valves open, the TTV and the extraction steam non-return valve close due to the loss of control oil. However, the control oil supplied to the speed control valve and the extraction valve still maintains normal pressure. Then, how do these two valves close?
No, after the aircraft lands, all control oil pressures are released. The two jump-off solenoids will open
This control system is different from those of Hangqi and Xinbilong that I have come into contact with; it’s worth collecting and studying*
The oil supply main is not leaking
It’s just a guess of mine: 1. After exiting the vehicle, the pressure-relief oil goes straight to push against the rod of the throttle valve, accelerating its closure; that’s the power piston, and this flow path is connected through a pilot valve. 2. It doesn’t matter for the pressure stabilization in the oil supply circuit; both valves enable the final pressure release of the hydraulic oil by switching through the oil supply and discharge pathways.
Those who have no experience with Mitsubishi products – this analysis is for reference only. 1. Why does the yellow oil drain line from the third circuit go to the speed control valve? It simply indicates that there is a pipeline connecting these two components. 2. After jumping out of the vehicle, the two solenoid valves open, allowing the control oil to flow away from them. Although the main control oil pipeline maintains its normal pressure, the pressure of the control oil reaching those valves is no longer present; as a result, the TTV actuator and the Extraction steam non-return valve lose their control oil supply and thus close.
Mitsubishi has not done this; in the case of Hangzhou Automobile and Delaiselan, after a stop signal is issued, the solenoid valve activates, allowing the control oil to return to its reservoir, thereby reducing the oil pressure. The pressure of the control oil drops to zero, and the TTV valve closes immediately due to the force of the internal spring. Similarly, the pressure of the speed control oil is reduced to zero, which causes the speed control valve to close as well.
I think your idea makes sense, but the exhaust valve doesn’t have a path to supply oil to the pilot valve; so how can the exhaust valve be closed?
Both the TT valve and the evacuation damping valve are closed by springs
I mean extraction control valve