The bleed valve / PRV is not electrically controlled. Its opening and closing is 100% pnuematic. The prv is connected via a sense line to a temperatute limiting thermostat solenoid valve (TLT). This TLT seals the sense line allowing pressure to build in the valve. As pressure increases inside the valve, the valve opens. The TLT is electrically commanded by the BMC in case of faults, or switches in the cockpit. When the solenoid in the TLT is energized by switches or BMC, the TLT relieves the air pressure in the sense line, then the valve closes.
I have a question - when starting the engines, the engine bleed valve closes, then how is the bleed air used for starting the engines? Does the bleed directly go to the starter valve?
Sir when you will open playlist < pneumatic system , there are three videos in continuation… having 1/3, 2/3, and 3/3 written in the title , if you would watch those 3 videos in continuation you will find that whole pneumatics has been covered, if you find any difficulties please let me know .
Amazing job thank you so much
Glad to know that these videos helped you … if you have any suggestions please let me know …
Very well made. All main points taken up. Your language clarity is very good. Best wishes.
TD.
Thankyou very much, I was quite concerned about voice quality and language clearly, thanks a lot for letting me know 😄
Thank you😊
Glad to know that this video helped you😄
The bleed valve / PRV is not electrically controlled. Its opening and closing is 100% pnuematic. The prv is connected via a sense line to a temperatute limiting thermostat solenoid valve (TLT). This TLT seals the sense line allowing pressure to build in the valve. As pressure increases inside the valve, the valve opens. The TLT is electrically commanded by the BMC in case of faults, or switches in the cockpit. When the solenoid in the TLT is energized by switches or BMC, the TLT relieves the air pressure in the sense line, then the valve closes.
I have a question - when starting the engines, the engine bleed valve closes, then how is the bleed air used for starting the engines? Does the bleed directly go to the starter valve?
Where can I find fcom explained on pneumatic system
Sir when you will open playlist < pneumatic system , there are three videos in continuation… having 1/3, 2/3, and 3/3 written in the title , if you would watch those 3 videos in continuation you will find that whole pneumatics has been covered, if you find any difficulties please let me know .