JL 255 • Air tight multi-leaf dampers

Air tight multi-leaf dampers in galvanized steel classified DIN EN 1751-4.

• For airstream regulation in ventilation and airconditioning systems

• Galvanized steel blades, frame, and round axle
• Air tight EPDM sealings between the blades and the gears
• Aluminium gears
• Air-tight polyamid bearings for temperature ranges upto 80°C

• Galvanized steel

• Galvanized steel aerodynamic designed regulation blades of 165 mm width containing aluminium gears for simultanious counter-rotating operation of the damper
• Air tight sealings between the blades and the gears classified DIN EN 1751-4
• Galvanized steel axle of Ø 12 mm and length 100 mm mounted on one of the above blades, wich extends 67 mm outside the damperflanges. Axle with borehole at its end to easily mount axle extension LOA 100 M or LOA 150 M (upon request), when a longer axle is required.
• Galvanized steel housing with depth of 175 mm and flange of 30mm, made out of 2 vertical panels with air tight polyamid bearings and 2 horizontal panels, all welded together
• All dampers are made to measure. To obtain the exact height of the damper when in-between sizes are ordered, the upper and lower frame will be bended towards or away from the middle of the damper(see drawing), to make a execellent fit with as much as possible standard fitted blades. Due to this fact the free area of the damper can become less than the opening of the LXH dimension.

• To be mounted between rectangular ducts with flanges of 30 mm
• To be surface mounted on wall, floor or ceiling

• Manual control handle with fixing system type MCS-251/255
• Mounted axle extensions type LOA 100 M, LOA 150 M
• Extra axle available upon request
• Square axle end of 9 x 9 mm, type SQE
• Actuators BELIMO
• Alternative bearings:
  • PTFE bearings for low and high temperature applications type TBS (from -50°C to 200°C) and pressures till 2000Pa
  • Brass bearings for high temperature applications type MBS (up to 250°C)
  • Ball bearings for high pressure applications type BBS (up to 80°C and 2500Pa)
• Air tight silicone sealings (for high temperatures upto 250°C) +10%
• Horizontal mounted coupling system type HVM
• Alternative outer-mechanism (for high temperature applications)
  • Counter-rotating blades (+20%)
  • Parallel moving blades (+20%)
• Reinforced frames (+5%)
• Multi-leaf damper with vertical blades (+15%)
• Alternative construction materials
  • Aluminium (x 2.25)
  • Stainless steel (INOX304) (x 3.75) (L max=1300 mm)
  • Stainless steel (INOX316) (x 4.3) (L max=1300 mm)
  • Aluminium blades with galvanized steel frame (x 1.75)
• Version ATEX available upon request

• The multi-leaf volume control dampers shall be of the air tight type classified DIN EN 1751-4 in galvanized steel with counter-rotating blades, aluminium gears, round axle and polyamid bearings.
• Type JL 255

• JL255, 1400, 1500, C30 + MCS-251/255

Explanation

JL 255 = Type of air-tight multi-leaf damper

1400 = Length

1500 = Height

C30 = connection flange

Accessories (Optional)

MCS-251/255 = Manual control with fixing system