Louver Dampers

Standard Opposed Blade Louver Damper – L210OB

Forward Engineering & Manufacturing LLC louver dampers are engineered with state of the art design features to all applicable codes and standards including ASME Boiler and Pressure Vessel Code, ASTM and AISI.

• Engineered for Service Longevity – All louver dampers are carefully engineered and manufactured to highest quality standards to assure installed performance and longevity.
• Welded Airfoil Blade – Louver dampers utilize die-formed plate welded into airfoil shapes for minimal static pressure loss when blades are open.  Blades are constructed of thicker plate to reduce corrosive, erosive and thermal effects of process gas systems.  The blade and internal stiffeners form a monocoque structure in which all elements are stressed efficiently.  All maximum bending, shear, thermal and combined stresses conform to ASME allowable stress values.  Blade deflection under maximum load is limited for: 1) the particular seal design to achieve required gas leakage, 2) operational stability, or 3) customer specification.
• Shaft – Stub shafts and through-shafts are designed considering combined bending and shear stresses imposed by a combination of dead, live and actuation loads at maximum static pressure and maximum temperature.  Allowable stresses are per ASME.
• Seals – Seals are all designed for maximum longevity in service.  Flex metal seals along each blade edge and end are engineered to last the life of the damper.  Blade end seals maintain constant contact with blade ends regardless of operating temperature.  Materials selected are corrosion resistant and fabricated ina thickness that will resist erosion. Bulb seats for internally lined dampers are designed to withstand 2300 degrees F. and static pressures exceeding 5 psi.  The bulb seat features an Inco 600 core, knitted wire outer wrap and a woven ceramic fiber jacket.
• Bearings – Bearings are selected based on application.  All bearings are positioned at least 6” from the frame (except Pressure Relief Louver Damper).  The standard ball bearing is available for most low temperature industrial applications 300F or less.  A heavy-duty ball bearing with high temperature grease and seals can operate to 500F system temperature.  A self-lubricating graphite sleeve bearing is available for all high temperature applications exceeding 500F.
• Packing Gland – The standard packing gland is a 2-bolt design having formed packing rings, the number of which depends on the maximum design pressure.  Leakage through the packing gland is zero (0) at any blade position at maximum design pressure.
• Frames – All frames are carefully engineered and fabricated to ensure precise dimensional tolerances are maintained for each application.   Damper frames must provide a platform on which the damper reliably isolates and controls flow.

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