no, but check your tire pressure
pressure relief valve relief the excess pressure which is developed in the syatem, while pressure reducing valve reduces the pressure and supply it to the system.
sounds like pressure relief valve if replacing the valve doesn't stop the leaking you may have to much pressure in your cooling system mainly a Head Gasket leak.
A thermal relief valve is a liquid-only relief due to expansion of a liquid with increased temperature.A safety valve relieves pressure due to a gas.It should be noted that "safety valve" is a general term which could refer to Pressure Relief Valves (PRVs) or Pressure Safety Valves (PSVs), terms which are used synonymously in some industries (such as the petroleum industry) to refer to all relief devices in general.
the pressure relief valve start to open at a set pressure and que flow capacity and lift increase as increase the pressure in the system, usually the overpressure rise a 10% above the set pressure. In a Surge relief valve the valve open 100% when the system rise the set pressure and the accumulation on the system it is less than 2%, ussually that valves do not change the fluid direction to handle height flow capacity. That valves prevent a liquid hammer, the standard PSV did not.
That would depend on which part of the system the RELIEF valve is located
The radiator cap controls cooling system pressure.The radiator cap controls cooling system pressure.
They serve two different purposes. An air bleed valve is used to remove air from the circulation system. A pressure relief valve is designed to automatically open when certain pressure levels are reached.
This is a safety valve for the pressure in the system do not exceed a certain limit. And the amount of pressure with respect to all system components are specified. This is for liquids and gases.
To relieve excess pressure in cooling system exceeding predetermined value.
The high oil pressure relief valve is located in the oil pump
No, there should not be pressure in the radiator after cooling down. If there is still pressure, it could indicate a problem with the radiator cap or the cooling system, such as a leak or a failing pressure release valve.