CQPD Series pneumatic disc brake

Model & Core Specs

Model Nomenclature: CQPD-25.4A/25.4B/40A/40B. The numbers denote disc thickness (25.4 mm, 40 mm); A/B indicate different mounting/air port configurations.

Operating Pressure: Max 0.7 MPa (7 bar); ambient temp -20°C to +60°C.

Minimum Disc Diameter: ≥610 mm; disc thickness matches the model (25.4 or 40 mm).

Weight: 57 kg (B-type), 63 kg (A-type); cylinder volumes 0.7 dm³ (B) and 3 dm³ (A).

Operation Principle: Pneumatically applied, spring released (normally open at no air pressure; air pressure clamps the disc for braking). Not a default fail-safe for loss of air-use QPD series if fail-safe is required.

Key Structural & Performance Features

Compact caliper design, lightweight, easy to mount at multiple angles around the disc.

Non-asbestos, clip-in brake pads for tool-free quick replacement, no need to re-align the caliper.

Self-lubricating bearings at pivot points, no routine lubrication, high transmission efficiency.

Air circuit can add a speed control valve to steplessly adjust braking time for smooth stops.

ISO9001/14001 certified; dry, clean compressed air required (FRL unit recommended to avoid cylinder damage).

Typical Applications

Suited for medium-to-low torque industrial machinery with stable air supply, such as:

Belt conveyors (mining, ports, power plants);

Light-to-medium cranes and hoists;

Printing, paper-making, textile tension control;

Metallurgical auxiliary drives, packaging lines.

Installation & Maintenance Notes

Ensure disc diameter ≥610 mm, surface runout ≤0.1 mm, finish Ra ≤1.6 μm;

Mounting bolts must be torqued to manufacturer's specs, check regularly for loosening;

Pad wear should be inspected periodically; adjust clearance if stroke exceeds the rated value;

Add a filter-regulator-lubricator (FRL) to the air line to prevent moisture and debris from entering the cylinder.

Comparison with QPD Series

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