Kollokation
The pressure inside the chamber will quickly force all water from the chamber out the drain valve.
Starting the system up in the spring involves closing the drain valves, then turning on the water supply and resetting the clock controller.
The water in the boiler will be hot, to avoid getting burned, it's best to wait an hour or two before opening the drain valve.
I finished draining off the water and closed the steamer's drain valve, then began coiling the hose.
Low-lift safety valve - the current position of the disc around the drain valve.
First turn off the burner and close the inlet valve; then position a bucket under the drain valve.
The drain valve is usually at the base of the furnace.
The valving arrangement of most dry-barrel hydrants is for the drain valve to be open at anything other than full operation.
It's easy to lower the water level; simply open the drain valve and allow the excess water to escape.
