I am having trouble with my radiators in my home, sometimes they bang and sometimes they squirt out water from the valve. Do I need to bleed all of the radiators? And what type of valve should be used on them. The valves that are on them are a US881, they almost look like a fat bullet, I saw at Home Depot they sell these smaller valves called air valles that you can open and close? Anyone have any suggestions? Thanks.