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Buy Pilot operated relief valve
The purpose of the Pilot Operated Relief Valve is to relieve reactor coolant system (RCS) pressure increases due to transients without operating the code safety valves. When the code valves are operated they often leak upon reseating and the plant must be returned to a cold shutdown for refurbishment of replacement of these valves. Safety precludes the use of block valves in series with code valves. Since at TMI-2 the reactor is not automatically tripped on the onset of transients that induce RCS pressure excursions, the Pilot Operated Relief Valve is used operationally to avoid a reactor shutdown and the resultant time that it would take to shutdown and restart The refrigeration valve relief pressure is used with ammonia and halocarbon refrigerant in no corrosive environments. The refrigeration valve relief pressure protects each refrigeration system pressure vessel that can be isolated by valves. A boiler relief valve or blow off valve, that has not been tested in a long time may become rusted closed, causing it to be as dangerous as not having one at all. You can test it yourself but it can be dangerous you can get scalded by the 180 degree to 210 degree water; Water this hot will cause a very serious burn. and in most cases once you pop the lever, the valve will not seat again, and the valve will need to be replaced. Both gas and electric water heaters have a safety device called a pressure relief valve. In the event the tank over-pressurizes, the hot water heater relief valve opens and releases the pressure. If the operation pilot relief valve does not operate correctly, the tank can over pressurize and explode.
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