by Fleegle411 » Fri Nov 20, 2015 6:09 pm
The device in question is called Tri-Cocks (don't hold me to that exact spelling), and yes they are used for checking water level should the sight glass become inoperable. when opened, one should get mostly water or just steam out of the valve's drain. The top valve should have water or steam, if one gets water out of the top valve, you don't need any more water in the boiler. the second valve should have either water or steam come out when opened, if you get steam out of the middle valve, it's time to add water. The bottom valve should always have water coming out of it. If you get just steam out of the bottom valve, run and take cover 'cause she's about to blow. Now of course, these valves open up to a hot boiler so you always get some steam, but if the valve is under the water level in the boiler you'll get water spraying out as well. the tub under the tri-cocks is to collect and drain away the water.