Place a bucket under the valve outlet and pull the lever at the top of the valve being careful not to scald yourself. Quickly release the lever, and hopefully, you have blown out the piece of rust or sand that is keeping the seal from seating. If this does not work, the valve must be replaced. DO NOT PLUG THE VALVE. That can result in your boiler blowing up.
SOURCE: my relief valve is leaking pretty bad
Before disassembling your valve try activating it a couple of times. Sometimes, especially if its dirt or sediment, it will clear the valve.
SOURCE: I have a Vaillant 624e boiler. I keep losing
The expansion tank is located on the header leaving the boiler. If it is a newer style than it will be a cylinder, most likely hanging above the boiler. It will have a valve on the bottom of the tank that looks like a tire or bicycle valve. If you put an air gauge on the valve stem it should read 12 psi, if it reads more, say closer to 30 psi, then the bladder is broke, and it should be replaced. If there is less than 8 psi, then there is probably a slow leak and the tank should be replaced. If it is an older expansion tank, it will most likely be mounted in the ceiling of the boiler room, it will be a large steel cylinder, that is piped into the boiler, and should have a drain valve on on side of it. If this is the case, connect a hose to the valve, and allow all the water to drain from it. This should solve the problem if it is your expansion tank. Hope this helps.
SOURCE: Rheen water tank does not work
Hi,
Turn the water off and replace the relief valve...
If there is that much water running out of it the hot water hweater cannot keep up...
Replace the relief valve and then you will have hot water..
heatman101
SOURCE: My Atwood 6 gal. water heaters pressure relief
If the water seems hotter than normal, then a faulty thermostat would be a good bet.
If water doesn't seem any hotter than normal, then check incoming water pressure.
usually 2 things cause that, too much pressure coming in, or thermostat faulty and not cutting out when normal temperature reached, thus higher temperature, and pressure. If both them check out, replace valve.
SOURCE: relief valve on my water heater is dripping.Can I
turn off water,turn off heater .drain tank slightly. simply unscrew and replace using teflon tape or pipe dope.to be sure if this will fix problem,you need to know what water presure is.you might need expansion tank.I add one on every heater I replace.presure might be hi coming into house then you need regulator
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