DUCTING VOLUME CONTROL DAMPERS & RADIAL FANS

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1 DUCTING VOLUME CONTROL DAMPERS & RADIAL FANS A group of :-

2 THERMOPLASTIC PP PPH PVC CPVC PVDF ECTFE tubes generally available with thickness of 3 mm PFA tubes generally available with thickness of 3mm DUAL LAMINATES DUCTING DAMPERS RADIAL FANS PP+FRP/GRP PPH+FRP/GRP PVC+FRP/GRP CPVC+FRP/GRP PVDF+FRP/GRP ECTFE+FRP/GRP PFA+FRP/GRP Material of Construction PP & HDPE up to 250 NB PVDF + FRP up to 2000 NB Complete FRP up to 2000 NB For FRP/GRP, we use the resins like Isophthalic, Bisphenol, Normal Vinylester & Super Vinylester Sizes: 25 NB to 2000 NB Tel: Website: info@likutech.com

3 INTRODUCTION TO DAMPERS The Selection Process:- Selecting the correct damper is critical to guarantee great working qualities in any wind stream framework, helping you expand vitality productivity and limit establishment costs. In any framework, the damper measurements must be suitable for the composed wind stream volume. The counseling engineer who plans a framework's ventilation work ordinarily computes damper sizes as a major aspect of the general air appropriation framework. For balancing control, the designer must pick sizes that make enough speed (and along these lines enough weight drop) to permit stable control. For segregation purposes or two-position control, the designer sizes dampers for economy, considering both the underlying expense and the continuous vitality impacts the weight drop and open damper makes. About Damper Sizes :- The building's mechanical arrangements give a rundown of required dampers. Damper sizes might be demonstrated in the floor arranges or control drawings. Choosing the control dampers includes checking the determinations and taking after the necessities, including size, flanges, blade and jamb seals, blade design, bearings, leakage requirements, opposed or parallel operation, linkages, jackshafts, and construction material. Damper sizes are generally called out using height by width on plans or schedules. Damper manufacturers by convention use width by height when placing orders. Control dampers are usually installed with the blades horizontal, so the width is the dimension in line with the blades. If the blades are vertically mounted, then thrust washers are necessary. When the blades are vertical, their weight forces the blades toward the bottom part of the frame. Thrust washers provide a low-friction surface between the blades and frame to prevent binding and damage to jamb seals. When blades are horizontal, thrust bearings are not required.

4 PARALLEL VS OPPOSED BLADE OPERATION:- Parallel blades rotate so they are always parallel to each other; therefore, at any partially open position, they tend to redirect airflow and increase turbulence and mixing within the downstream duct work or plenum. This characteristic makes them good candidates for return and outside air intake into a mixing chamber. The two dampers are often linked together (one opens and one closes) to coordinate control. Opposed blades rotate opposite each other in adjacent pairs. Air discharge through this type of damper is straighter and a bit quieter under partial-flow conditions. Opposed blade dampers are often specified where air direction control is important relative to other factors, such as within final volume control devices. The flow characteristics of parallel and opposed dampers are different; an opposed blade damper must be opened further (creating a higher modulating pressure drop) to provide the same percentage of total air volume as a parallel damper (creating a lower modulating pressure drop). When they are wide open, the pressure drop is the same for both types. BLADES:- Damper blade design varies among manufacturers. There are flat blades, triple V-groove blades, single or double layer blades, and airfoil blades. The most costly is the airfoil blade which reduces noise, has the least flow resistance, and the tightest leakage. The most common is the V-groove, which offers economy and moderate flow resistance. In northern climates, multi-layered blades with insulating cores are often used for outside air control to keep the inside surfaces from icing up. Other specialty blade types are available to cope with various conditions. It is critical to consider damper leakage when selecting dampers for cost, efficiency, and control, and to protect the duct work from environmental conditions. Low leakage or ultra-low leakage dampers incorporate a seal along the edge and the side of the blade to minimize leakage when the dampers are fully closed.

5 STANDARD CONSTRUCTION :- Fire Retardant : As per ASTM E-84 Manufacturing Std : ASME / RTP-1 / BS-4994 / ASTM / ISO 7005 Temperature : 150 C Pressure : Full Vacuum / Allowable pressure Leakage : Zero Operations : Manual, Worm gear & Motorized actuation No. DESCRIPTION QTY. MATERIAL 1. BODY 1 FRP 2. DISC 1 PP/ISO.PP/PPH/PVDF 3. SPINDLE 1 SS-304/ SS-316/ ANY MATERIAL 4. BOTTOM PIN 1 SS-304/ SS-316/ ANY MATERIAL 5. SEAL 2 EPDM/ VITON/ NEOPRENE 6. HINGLE PLATE COVER - PP/ ISO.PP/ PPH/ PVDF 7. SPINDLE BOLTS - SS-304/ SS-316/ ANY MATERIAL 8. HINGE PLATE - SS-304/ SS-316/ ANY MATERIAL 9. ACTUATOR - AS PER DETAIL BOTTOM FLANGE 1 FRP 11. FASTENERS - SS-304/ SS-316/ ANY MATERIAL 12. MANUAL OVERRIDE 1 AS PER SPECIFICATION 13. SOLENOID VALVE 1 AS PER DETAIL LIMIT SWITCH 1 AS PER DETAIL 4