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Old 09-22-2007, 12:30 AM   #1
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reducing and relief valves


the supply pipe to my radiator furnace has, after a stop valve, two bell shaped contraptions immediately one next to the other. they are very similar except that the one that says RELIEF VALVE is regulated by a slider that goes around and the one that says REDUCING VALVE has a screw/bolt on top that seems to be its regulator.

can someone please explain the function of these valves. my guess is that one of the roles is to prevent the heated water that goes past them mix with the regular supply water before them but i am also guessing there are more functions.

i can take a picture and post if anybody would find it helpful.

thanks much.

- a

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Old 09-22-2007, 05:55 AM   #2
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reducing and relief valves


The reducing valve reduces the water pressure from whatever you have (usually about 60psi) to the boilers operating pressure (usually about 30psi). The relief valve is a saftey to keep the boilers pressure from going over what it should be. If the pressure for some reason goes over whatever the relief valve is set at it will allow water to drain out of the valve reducing the pressure in the system.

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Old 09-22-2007, 12:35 PM   #3
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reducing and relief valves


thanks. what makes a boundry between the hot water in the radiator system and the water supply ?
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Old 09-23-2007, 06:05 AM   #4
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reducing and relief valves


The reducing valve also acts as a back flow valve.
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Old 09-23-2007, 02:14 PM   #5
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reducing and relief valves


thanks sir. you've been very helpful.
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