a valve connected at or near the bottom of a boiler for the purpose of draining and/or flushing
a silicate of calcium and magnesium, usually occurring in fibers, that does not burn or conduct heat. Used as an insulator and in the manufacturing of cement asbestos pipe.
1. a unit, or units, which interrupt the continuity of electrical connection. 2. to separate; to cause non-continuity electrically.
a white metallic element that looks much like tin. Its alloys help reduce friction and offer great resistance to fatigue. It is softer than zinc and resists corrosion better, and often replaces zinc in galvanizing iron and steel.
an adjustable means to limit the maximum setting of the device towards the hot position, limiting the maximum discharge temperature.
1. tongs for turning large pipe. Consists of a lever with notched head whose teeth engage the pipe and an adjustable short chain which encircles the pipe and whose ends are secured to the head. 2. a lever handle with jaws with teeth and a chain. 3. a form of wrench utilizing a chain.
a colorless, nonflammable gas used in making heat resistant and acid resistant plastics such as teflon.