Type of valve, valve kitna prakar hota he, valve type

Type of valve ?
valve kitna prakar ka hota he
what is valve
valve ka kam kiya he
gate valve ka kiya kam he
globe valve ki kiya kam he
ball valve
PSV valve full detail
check valve ka kam kiya he
butterfly valve kaise kam korta he
valve detail video
#mechanic
#construction
#valve
#type of val