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CQP-A Series Pneumatic Disc Brake | Multi-Disc Compatible, Air-Apply Clamping, IP67, Explosion-Proof Option, Factory Direct

CQP-A Series Pneumatic Disc Brake ✔ Normally Open - Air to Clamp, Air Off to Release CQP-A is a normally open pneumatic caliper disc brake. With no air supply, the brake pads retract and the disc rotates freely. Apply compressed air (4–6 bar) → both caliper arms close simultaneously...

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Description

CQP-A Series Pneumatic Disc Brake

✔ Normally Open - Air to Clamp, Air Off to Release

CQP-A is a normally open pneumatic caliper disc brake. With no air supply, the brake pads retract and the disc rotates freely. Apply compressed air (4–6 bar) → both caliper arms close simultaneously → pads clamp the brake disc. Designed specifically for clamping, tensioning, and holding duty - the opposite logic of a fail-safe emergency brake.

✔ Air Pressure = Clamping Force (Infinitely Adjustable)

Clamping force scales linearly with air pressure. One turn of your regulator valve changes force from light positioning to full-load braking. No spring preload adjustment, no torque scale guessing. One caliper covers multiple duty levels.

✔ Zero Oil / Spark-Free / Explosion-Friendly

Pure pneumatic actuation - no hydraulic oil, no electric motor on the caliper. No combustible fluid, no ignition source. Inherently safe for coal mine, chemical plant, flour mill, paint shop. Optional Ex d flameproof solenoid valve available.

Products Description

The CQP-A Series is a range of pneumatic caliper disc brakes built for work-holding, tension control, and positioning applications where fail-safe stopping is NOT the primary requirement. Instead of "stop the load when power fails," CQP-A answers: "hold this load exactly where it is, with adjustable force, as long as air is supplied."

It is the missing piece in your brake lineup - completing the three-way coverage:

Logic	Series	Best For
Fail-safe NC (power/air off = brake ON)	QW (pneumatic) / YW (electro-hydraulic)	Emergency stop, hoist safety
Work-hold NO (air on = brake ON)	CQP-A (this series)	Clamping, tension, positioning

Typical Applications:

Wind turbine yaw lock - hold nacelle position against wind torque
Coiler / uncoiler tension brake - adjustable back-tension on strip line
Cable winch parking - hold rope tension when operator steps away
Rolling mill coil car - clamp coil during transfer
Conveyor transfer stop - positive positioning of pallets/carts
Port grab bucket rotation lock - hold bucket angle during lift

Technical Specifications

Parameter	Value
Series	CQP-A (Normally Open, Air-Apply, Spring-Release)
Brake Type	Pneumatic caliper disc brake, floating arm
Disc Diameter Range	Ø250 – Ø500 mm (common: Ø300 / Ø355 / Ø400)
Disc Thickness	20 / 25 / 30 mm (confirm at order)
Clamping Force (per side)	CQP-A-25: ~25 kN / CQP-A-40: ~40 kN (at 6 bar, μ=0.35)
Estimated Braking Torque	CQP-A-40 @ Ø355, μ0.35 ≈ ~1000 N·m
Actuation Medium	Compressed air, 4–6 bar (max 8 bar)
Air Consumption per Cycle	~0.20 L (at 6 bar)
Opening Time	~0.12 s
Closing Time	~0.18 s
Air Connection	G1/4" BSP (NPT optional)
Solenoid Valve	24V DC / 220V AC / Ex d optional
Protection Class	IP67 (caliper body), IP65 (valve)
Explosion-Proof Option	Ex d I Mb / Ex d IIB T4 Gb (solenoid only)
Friction Lining	Asbestos-free, card-lock insert type
Lining Wear Limit	5 mm
Ambient Temp.	-30°C to +50°C (no hydraulic oil to freeze)
Standard	JB/T 10917, ISO 13849 reference
Mounting	Side-mount bracket, horizontal/vertical adaptable
Options	Solenoid valve, limit switch, manual release, Ex d valve, low-temp seal kit

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