DanELAST - Zero Leakage Dampers
Daniel Company offers precision-engineered fiberglass reinforced plastic zero-leakage DanELAST isolation dampers utilizing only highly corrosion resistant parts for air movement and controls. Zero-leakage DanELAST dampers are fire retardant, corrosion resistant, and UV protected. All components are designed with replaceable parts that are easily disassembled for maintenance. The blade shafts are constructed of custom-milled, solid 316SST metal. Daniel Mechanical Company’s zero-leakage DanELAST damper utilizes a specially formulated elastomer with corrosion resistance equal to and/or superior to EPDM, Hypalon, and even Viton.
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Product Details
No circumferential blade seals are required to achieve a full shutoff of the zero-leakage 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 zero-leakage 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 zero-leakage 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 zero-leakage DanELAST isolation dampers may reduce safety risks caused by contaminant air leaks.
Zero-leakage DanELAST isolation dampers require far less maintenance, are more durable, and outperform conventional butterfly dampers. Zero-leakage DanELAST dampers range in sizes from 4-inch diameter to 120-inch diameter.
Specifications
Standard Construction
- Frame: Vinyl ester resin fabricated to ASME/ANSI RTP-1
- Flange: NBS PS 15-69-3.4.7 ¾” thick, hand lay-up integral to body per ASME RTP-1-2000 Standard Fig. 4-7.
- Blade: Vinyl ester resin similar to damper frame. Unitary construction with no circumferential seal or backstop, having a calculated percent deflection of L/360
- Stiffeners: Same material as frame and integrally molded to blade
- Shaft: 316 SST with nuts, bolts, and washers (FRP encapsulated if required)
- Shaft Seal: Externally adjustable compression type with FRP housing and Viton O-ring
- Bearing: Teflon
- Operator: Worm gear with hand wheel, chain wheel, pneumatic, or electric actuation
- Gel Coat: Paraffinated, with ultraviolet inhibitor
- Color: White unless specified otherwise
- Maximum Temperature: 200°F
- Maximum Pressure: 30” w.g.
- Maximum LeakagecZero cubic feet per minute per square-foot of cross sectional area
- Lubricant: None required
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