Then you'll experience frequent low oil pressure issues.
Lets liken this to a garden hose, a hose in the normally open position has water flowing through it until it is closed by turning the spigot off, normally closed is the reverse. Oddly enough when it comes to an electronic relay the opposite is true, whereas the switch is in the open (normally open) position therefore having no current passing through it until a switch to close the circuit and allow current to flow. Normally closed has current flowing at all times until the switch interrupts it stopping the flow of electricity.
A close center directional valve holds the position of the cylinder. This is because in its center position its 4 ports (4/3 way) are blocked. An open center valve on the other hand does not hold position in the center position. This valve is commonly used for motors because it handles system overloads or "shocks" to the system. All 4 ports are connected in the form of an H. This valve is sometimes called an H-mid position valve. I hope this answered your question. I'm a 1st year mech eng student so I might not have covered the details you were looking for.
Stop Boiler Valve (or Crown Valve) is installed on an outlet line of a boiler. It's purpose is isolation of a boiler from a downstream steam line. Its position may be either open or close, it cannot be used for throttling of steam.
Bad compressor valves most likely... If the expansion valve or orifice tube is stuck open it will cause this condition also.
when relief valve fails open the system will have nopressure resulting in weak hydraulic operation and if it fails closed( that is the relief valve stuck closed) itwill result in very high system pressure resulting in a very high load on the pump and the enginerunning or driving it.Muawiah Itum
If it's stuck in the completely open position, it can.
If the engine were to backfire for whatever reason and the pcv valve is stuck open, the backfire could carry into the crank case and ignite the crank case fumes. I have seen valve covers blown off an engine from this situation.
yes. a valve in the open position will prevent compression, thus no combustion.
You replace the gas valve.
My brinks locked in the open position. What do I need to do to get it fixed
Blowback into a 91 F150 air filter could be caused by a bad PCV valve. Check the valve for it being stuck in the open position.
Sure if the valve gets stuck open and the flapper get stuck closed.
If by "overloading" you mean flooding (too much fuel), two reasons are (1) the carburetor needle valve is "wide open" or the float is stuck in the open position.
In the open position
It could be that the spark need to be replaced. Other reasons could be that the carburetor needle valve is opened too far, or the float is stuck in the open position.
StUck in open position
It is possible if it is stuck open, but highly unlikely.