JF

Application

• TROX tunnel dampers of Type JF are specially designed safety components that meet the RABT and RVS requirements
• For opening and closing smoke extract ducts
• Used in ventilation and smoke extract systems in underground transport systems
• Can also be used as shut-off dampers for fans
• Installation usually either above the roadway in an intermediate concrete ceiling or in the ventilation plant room
• Bespoke solutions upon request

Special characteristics

• Excellent low leakage performance of 0.1 m³/s per m² at a differential pressure of 3000 Pa
• For high operating pressure of up to 5000 Pa
• Low pressure drop
• Maximum corrosion and temperature resistance
• Excellent fire resistance of 120 minutes at 400 °C
• Remote control with actuator

Classification

• Machinery Directive 2006/42/EG, Declaration of incorporation
• Test report no. 210004049 – MPA NRW (Germany)
• Stability report no. 7317/06 – Afiti Licof (Spain)
• Test report no.  2007-757.01 – MA 39 VFA (Austria)
• Test report no.  210005454 – MPA NRW (Germany)

Nominal sizes

• B = 400 – 2,200 mm, in 100 mm increments as standard; H = 440 – 2,175 mm, in 195 mm increments as standard
• Available also in intermediate sizes (B and H) of 1 mm increments
• Sizes outside of the stated ranges are available upon request
• For larger sizes several dampers can be combined and fitted on a support structure

Variants

• JF-S: Tunnel damper with opposed action blades
• JF-P: Tunnel damper with parallel action blades

Construction

• Galvanised sheet steel, flange holes on both sides, brass bearings, seals made of stainless steel
• A4: Stainless steel sheet, flange holes on both sides, stainless steel bearings, seals made of stainless steel

Parts and characteristics

• Electric open/close actuator or spring return actuator including limit switches
• Thermally insulated protective enclosure for the actuator, made of galvanised sheet steel or stainless steel sheet and faced rockwool mats
• Aerofoil blades with side seals and longitudinal tip seals

Optional equipment

• Installation subframe
• Baffle plates
• Walk-on grilles as bridges
• Support structure

Accessories

• Actuator
• Thermally insulated enclosure
• Quadrant stay with position indicator

Construction features

• TROX tunnel dampers of Type JF-S/P-TD consist basically of a casing, movable blades and linkage
• Casing made from four C-sections of sheet steel, welded at the joints
• From B > 1000 mm the blades are divided by a centre mullion
• The H sides are fitted with special side seals made of stainless steel
• Blades are double skin steel sections, screwed together, with longitudinal blade tip seals made of stainless steel, for opposed or parallel action
• Remote control with an actuator which may require a thermally insulated protective enclosure (depending on application)
• Enclosure can be fitted with baffle plates in order to reduce the aerodynamic drag in the smoke extract duct

Materials and surfaces

Stainless steel construction:

• KM: (only with stainless steel construction) All gaps, threads, and joints of corrosion-resistant steel are treated with a varnish for corrosion protection and preservation.
• Frame and blades: Stainless steel sheet, AISI 316Ti (1.4571)
• Shafts: Stainless steel, Ø 20 mm, AISI 316Ti (1.4571), surface treated with Kolsterising process
• Bearings: AISI 316Ti (1.4571)
• Linkage: AISI 316Ti (1.4571)
• Longitudinal blade tip seals: Stainless steel sheet, AISI 316Ti (1.4571)
• Side seals: Stainless steel sheet, AISI 316Ti (1.4571)
• Connecting elements: A4

Galvanised construction:

• Frame and blades: Galvanised sheet steel, DX51D+Z150-200NAC to EN 10327
• Shafts: Stainless steel, Ø 20 mm, AISI 303 (1.4305)
• Bearings: Brass CuZn40Pb2 (CW617N)
• Linkage: Stainless steel, AISI 304 (1.4301)
• Longitudinal blade tip seals: Stainless steel sheet, AISI 301 (1.4310)
• Side seals: Stainless steel sheet, AISI 301 (1.4310)
• Connecting elements: Galvanised

P1 Powder-coated construction:

• Frame and blades: Galvanised sheet steel, DX51D+Z150-200NAC to EN 10327
• Shafts: Stainless steel, Ø 20 mm, AISI 303 (1.4305)
• Bearings: Brass CuZn40Pb2 (CW617N)
• Linkage: Stainless steel, AISI 304 (1.4301)
• Longitudinal blade tip seals: Stainless steel sheet, AISI 316Ti (1.4571)
• Side seals: Stainless steel sheet, AISI 316Ti (1.4571)
• Powder coating: RAL (coating thickness 60 μm)

Maintenance

• Low maintenance; operational reliability is ensured even after extended stand-by use; long service life
• Maintenance-free bearings
• Regular inspection is required in spite of robust construction and highly corrosion-resistant materials. Service as required, e.g. removing contamination that impairs the function or causes corrosion