LINNIG
Shutting-Speed Regulators
Fire protection gates: Ensuring safety in emergencies
Trust the Original – LINNIG Shutting-Speed Regulators
Fire protection gates prevent fire from spreading through wall openings in fire-resistant or fireproof walls. In the event of a fire, these gates must close automatically without an external power source. Counterweights or spring brakes generate the closing force, while internationally approved closing-speed regulators ensure a controlled and consistent closing speed.
Sliding fire doors must include automatic locking mechanisms that engage during emergencies. Once activated, the closing process can pause only to protect individuals but will resume automatically once the area is clear. Our shutting-speed regulators ensure smooth, reliable operation, enhancing fire safety in critical situations.
Working principle
LINNIG Shutting-speed regulators
LINNIG shutting-speed regulators provide a reliable, compact solution for controlling fire-protection closures in compliance with legal requirements. These regulators use an eddy current braking system to control shutting speed. A rotating copper disc and a steel disc interact with permanent magnets arranged in a circular pattern with alternating poles. This setup generates eddy currents in the copper disc, creating a braking torque that slows the drive shaft The braking force is adjustable by changing the air gap between the copper disc and the magnets. A smaller gap increases braking torque, while a larger gap reduces it. To ensure the necessary speed for effective braking, all shutting-speed regulators include a hardened reduction gear, enabling a service life of at least 200,000 cycles.
For opening, the gate is manually operated using a freewheel mechanism in the deflection pulley or chain wheel. Since the brake is disengaged in the opening direction, only the gate’s weight and counterweight need to be moved.
How it works: Key functional features
Our shutting-speed regulators control the speed of sliding doors and similar moving masses. An electromagnetic locking device keeps the door open. When deactivated – either manually via a pushbutton or automatically by a smoke alarm – the door closes automatically.
The closing mechanism operates using a counterweight or a spring-cable reel connected to the door by a rope. The closing speed is adjustable, and the eddy current system functions without wear and tear.
Benefits at a glance
for all types of fire protection closures:
- Compact design
- Wear-free speed regulation
- Oil-free system
Variants
Shutting-speed regulators
with locking device
Door/gate is opened manually and can be locked at any position.
Shutting-speed regulators
with locking device
and chain winch
Door/gate is opened via chain winch and can be locked at any position.
Shutting-speed regulators
with locking device
and electric motor
Door/gate is opened manually and can be locked at any position.
Technical specifications
Technical data
Max. shaft loading:
750 – 1,000 N
Max. shutting force in wire cable:
150 – 200 N
Voltage, holding element:
24 V
Max. holding torque:
8.9 – 12.9 Nm
Power rating of locking device:
2.15 – 5 W +/- 10%
Power rating of opening aid:
0.07 kW
Drive torque of opening aid:
20 – 30 Nm
Degree of protection, unit (IP):
IP 54
Degree of protection, connection (IP):
IP 50
Permitted braking power:
40 – 60 W
Permitted operating temperature range:
-15 C to +40°C
Adjustable shutting speed:
0.08 – 0.2 m/s
Downloads | Certificates & Brochures
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