An air valve that’s spitting or leaking water may be partially obstructed with mineral deposits or other debris. Try to clean the valve with vinegar. If that doesn’t solve the problem, replace the valve.Click to see full answer. Similarly one may ask, why does my radiator spit out water?The cause for your problem maybe improper tilt of the radiator. The radiator must tilt towards the pipe that comes up from the floor. As the steam gives off heat it condenses back into water and the proper tilt allows the water to drip into the pipe and back to the boiler.One may also ask, how do you drain a steam radiator? How to Drain a Radiator Turn off all power to the boiler. The power switch will be located on the boiler. Turn off the gas to the boiler system. Shut off the water intake valve. Let the system cool down for at least 30 minutes. Locate the drain valve at the bottom of the boiler. Open the drain valve by turning it counter-clockwise. Likewise, why are my steam radiators banging? When steam radiators start emitting a loud knocking or banging sound, it’s usually because there’s condensed steam (water) trapped in the pipes. Once the steam cools down, the air vent automatically opens to allow the water to drain out of the radiator and back to the boiler.How does a single pipe steam radiator work?In one-pipe steam installations, steam flows from the boiler to the radiators, where it displaces the cold air by pushing it out through a vent on the radiator. The air vent closes automatically when the radiator is full of steam. This condensate then flows back again through the same single pipe.

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