A valve spring "keeper" or AKA a valve spring "retainer" is used to lock a valve spring to the valve.
The lock valve is connected to a hydraulic cylinder by forcefully pressing it into the fitting and releasing the retaining ring. This will lock the cylinder into place and keep it from moving.
pulmanary valve is ppoop
is the starting valve
it is the valve which reduce the pressure.
The purpse of valve lifters is exactly what it says, to lift the valve.
I believe that would be the rear brake anti-lock control valve. You should still have rear brakes with that disconnected but the anti-lock will not function.
With a chain and lock of course like we do on fire suppression systems to prevent tampering
solenoid valve function is to hold or handle the flow of gas or liquid pressure
The function of steam stop valve to supply steam to steam maniform and the function safety valve to prevent the steam high pressure over.
The function of an expansion valve is to regulate the flow of a substance. One example is a thermal expansion valve which regulates the flow of cooling substances within a device.
The function of back pressure valve is to prevent back flow to the pump in case there is an obstruction on downstream side of valve.