ball cock
A float valve with a spherical float.
General
ball-check valve
valve in a piping system; when the fluid flows in one direction, pressure against a movable ball allows fluid to
General
ball catch
A door fastener having a contained metal ball which is under pressure from a spring; the ball engages a striking
General
ball-bearing hinge
A hinge which is equipped with ball bearings between the hinge knuckles in order to reduce friction.
General
ballast noise rating
A measure of the noise generated by a fluorescent lamp ballast; designated by letters from A (the quietest) through F
General
ballast factor
The ratio of the luminous output of a lamp when operated on a ballast to its luminous output when operated