PRV valve going off?

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Old 12-08-07, 03:53 PM
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PRV valve going off?

just noticed some water in my basement floor just a little bit last 2 days. the water coming from the pressure valve. i chaecked everything and temp is good 170 is the high! the pressure is 12 cold and about 16 hot. i checked the expansion tank and it has no air in it? i dont know why its a brand new tank would that casue this? there no air in my system? what is the pressure suppsoe to be at? i think it wat at about 12 psi when i installled it. is the preesure suppsoe to be few pounds above 12psi?
 
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Old 12-08-07, 05:20 PM
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Did you depress the valve on the expansion tank with water pressure in the system?
 
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Old 12-08-07, 06:28 PM
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no/infact i checked it a month ago when i iunstalled it and it had like 12 psi i belive.
 
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Old 12-08-07, 06:31 PM
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Your hot pressure is 16 PSI, there's no reason a 30 PSI relief valve should be opening...
 
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Old 12-08-07, 07:12 PM
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is the expansion tank effecting this? i dont get it, i have not seen the preesure relife valve go off yet i just seen some water on ym floor and seen the valve was a little wet.
yes trooper you are right i just watched the boiler for about 15 min. and the pressure went upto 30psi.
 
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Old 12-08-07, 07:15 PM
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Could it be from the water heater? Is the discharge tube wet inside?
 
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Old 12-08-07, 07:19 PM
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no its coming from the boiler pressure relife valve, i felt it wet inside. only thing not abnormal is the expansion tank. the tank has no air prssure to it, could it have leaked its air out? be deffective? can i fill the tank up with air again? and how? should i wait till the system is cool? or no water flow running?
 
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Old 12-08-07, 07:56 PM
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Originally Posted by tony45power View Post
yes trooper you are right i just watched the boiler for about 15 min. and the pressure went upto 30psi.
Then why on earth did you say the pressure was 16 PSI hot in your first post ? You want accurate answers, you gotta give accurate information !
 
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Old 12-08-07, 08:13 PM
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Isolate the tank and repressurize... see if it maintains pressures for an hour... then put it back into action if it does.
 
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Old 12-08-07, 08:23 PM
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so take the tank off and then fill it up to 12 psi? see if it holds for an hour.
 
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Old 12-08-07, 08:28 PM
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Or just reduce system pressure to zero... but more accurate removed. Careful... it's going to be really heavy.
 
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