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The calipers are of the opposed piston design. This design permits fixed mounting of the caliper and the brake disc. Symmetrical split construction of the piston housings permits center reaction mounting and the ability to accommodate brake discs of different thicknesses. Friction shoes attach to the caliper actuating pistons are replaceable without disturbing the caliper mounting. Pressurizing the piston cylinders causes the piston mounted friction shoes to clamp the disc, developing the braking torque.
Caliper model 225DP100 is designed with self adjusting retracting mechanisms which compensates for friction material wear and maintains a constant running clearance between the friction shoes and brake disc. They also maintain a constant displacement volume and hence a constant response time for each brake engagement.
Caliper model 200DPA is a symmetrical opposed piston caliper brake design that is well suited for most high torque, high energy stopping applications. Model HC-3 and HD-3 calipers are designed for very heavy duty braking service. The design automatically compensates for run out on large diameter brake discs. Because of this feature, they require manual adjustment to compensate for friction material wear and to maintain a constant volume displacement for actuation. Model HC-3 requires a mounting between the piston housings. Model HD-3 is used for side surface mounting.
Low coefficient friction shoes are available which permits the calipers to be used as tension brakes.
All three caliper models can be air or hydraulic actuated. The pressurizing media must be specified to insure proper piston seal compatibility.
Two seals are available: one for air and mineral base fluids, and the other for vegetable base fluids.
Maximum allowable operating pressure is 1000 psi (69 bar). For those installations not equipped with a high pressure power source, a pressure intensifier can be used to provide the required pressure. This device multiplies a low air pressure input into a high hydraulic pressure output.
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