Because we don't know what system you are referring to we can not give you a set pressure. Each system is different.
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A pressure relief valve would have a set pressure somewhat higher than the maximum steam pressure, but less than the pressure rating of the associated pipes and vessels. A stop valve would not have a set pressure, but it would have a pressure rating (accounting for temperature) somewhat higher than the pressure relief valve setting.
"Somewhat higher" may depend on local piping code requirements, such as a factor of 1.25 or thereabouts.
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As per my friend Tornado - A stop valve would not have a set pressure, but it would have a pressure rating (accounting for temperature) somewhat higher than the pressure relief valve setting
. He is right .
A stop valve 1.5 times the line pressure is suitable but you have to seek your piping codes and advice of your consultant.
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Pressure of Main Steam Stop Valve
Re: presure
