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Brake construction and operation is shown in the figure.
Pressurizing the brake compresses the brake springs and
withdraws the clamping plates from the brake discs. Standard
brakes are furnished with either one or two discs, which are
free to move axially.
Model DBA uses a rubber diaphragm to form the releasing
pressure chamber and to serve as the releasing piston. Brake
friction material is attached to stationary components. Brake
discs are either solid or ventilated. The disc type is indicated
by an S for solid, or V, for ventilated, in the brake model designation.
Solid discs are used in applications requiring a heat
sink and/or where engagement is infrequent. Ventilated discs
are recommended for cyclic applications.
Torque ratings listed are for brakes with a standard compliment
of springs. The quantity of springs can be varied to
customize the torque of the brake to suit a particular application.
Consult the factory for brake torque of units with nonstandard
Brake sizes are indicated by the number of brake discs and
the disc diameter in inches. For instance, size 229DBA has
two discs 29 inches in diameter.