No circumferential blade seals are required to achieve a full shutoff of the bubble-tight DanELAST isolation damper. This is largely due to the innovative design and expert hand craftsmanship of each key part. By constructing the unitary FRP blade to exact tolerances and without a commonly used circumferential blade seal, the weakest part of the damper is eliminated, thus improving its reliability. No blade stops are utilized, decreasing the pressure loss across the damper when in the full open position. Each bubble-tight DanELAST damper is factory tested to operating pressures exceeding 30 inches w.g. Leakage rates are tested using AMCA 500-D procedures, and the certified ratings are authorized by AMCA.
The bubble-tight DanELAST damper blade is operated using a hand-wheel driven worm gear operator. Pneumatic, electric, or chain-wheel type operators are optional. Long life Teflon bearings and extensively tested molded plastic bushings accessible from the exterior of the damper require minimal maintenance and ensure unrestricted movement of the rotating shaft. All metal parts in contact with process air stream are at a minimum 316 stainless steel and may be manufactured of more exotic metals such as Hastelloy-C and Titanium.
Zero-leakage DanELAST dampers enhance safety by providing greater isolation of process air during shutdown of low pressure exhaust system duct lines conveying hazardous air streams. When dealing with confined space entry conditions, use of bubble-tight DanELAST isolation dampers may reduce safety risks caused by contaminant air leaks.
Bubble-tight DanELAST isolation dampers require far less maintenance, are more durable, and outperform conventional butterfly dampers. Bubble-tight DanELAST dampers range in sizes from 4-inch diameter to 120-inch diameter.
