They will prevent excessive pressure.
Radiator cap pressure relief valve.
If the cap s spring is weak it is.
The arrow on the valve indicates the flow.
Air causes poor engine cooling and is the main cause of cooling system component corrosion.
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Usually this is set at a density of 15 pounds per square inch psi.
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Radiator caps also serve as pressure relief valves.
As the vacuum continues to build up the two way check valve which is exactly what a radiator pressure cap is goes to work.
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The vacuum valve opens and allows coolant to flow from the overflow tank back into the radiator.
The pressure cap also prevents radiator hoses and tanks from collapsing.
The radiator cap is a very important part of the engine s cooling system yet it is often overlooked when troubleshooting the system.
Locate the system s pressure rating on the top of the cap.
The radiator cap acts as a release valve set to open at the maximum pressure point.
The top portion of the radiator cap will list the pressure rating.
Too much pressure can cause damage while not enough pressure can cause the engine to overheat.
High pressure radiator cap.
It threads into a 1 4 npt hole in the top radiator tank and it limits the pressure in the radiator to 15 psi.
Always use a cap of the correct pressure for your cooling system.
The cap acts as a pressure relief valve.
This valve allows for contraction as the fluid cools.
Get it as soon as fri sep 25.
Both the pressure relief and vacuum relief valve must be easy to lift and spring.
Get it as soon as tue jun 30.
The radiator filler neck has an overflow tube right between the two sealing surfaces.
The pressure relief valve spring is compressed against the lower seal when you lock the cap.
If there were not a radiator pressure cap installed the system would draw in air.
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Unchecked high pressure could cause damage to the radiator heater core hoses or water pump seal.
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When the fluid pressure inside the radiator exceeds 15 psi it forces the valve open allowing heat to escape and excess coolant fluid to overflow into the tanks on either side of the radiator.
The aluminum t bucket radiator does not use a conventional pressure radiator cap rather it uses the decorative t caps to seal the neck at the top of the radiator.
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As the engine cools it causes a vacuum in the cooling.
Where to find the pressure rating.
If an individual expansion tank is installed which is mostly the case today the expansion tank cap is equally important.
