Category: Registres

Bachmann Dampjoint designs and manufactures a multitude of different types of gas-flow dampers in all sizes and configurations. Usually found in heavy utility and industrial plants, Bachmann Dampjoint gas flow dampers, with many cost-effective innovations, are used for isolation, flow control or a combination of both. The blades are actuated by pneumatic, electro-mechanical, hydraulic, or manual drive systems.

Combining efficient seating and rugged design, butterfly and louver dampers are capable of 99.9% shut-off in certain applications. Flexible stainless steel or nickel alloy seals assure long-life and easy maintenance. Elastomeric tadpole seals achieve extremely tight shut-off in low temperature applications. The damper blades are designed to avoid binding even under the differential expansion conditions prevalent in system start-up or shut-down.

Bachmann Dampjoint (BDI) Standard butterfly and louver dampers are:

  • Designed specifically to suit the application
  • Engineered to formulas developed by BDI’s unique R&D program
  • All-welded for maintenance free operation
  • Made of formed plate, cut with high-definition plasma for precise interface with existing equipment
  • Made with stainless steel oversized shafts combined with stuffing boxes and external graphite-impregnated bearings
  • Available with a choice of alloys and seals
View Butterfly damper seal

Large base of louver know-how, extensive research data and confidence of industry in BDI damper designs comes from this simplest, yet possibly most underestimated and misused flow control device. This true workhorse for any industry has system designers, engineers and maintenance specialists in agreement as being the most efficient damper but only if built right. BDI’s large share of butterfly damper production is the replacement of dampers made by others that either did not perform to specification or experienced critical failures. We have yet to hear about BDI butterfly dampers being
replaced by others.

While the BDI quality may be evident to more experienced end-users of dampers, most engineers consider butterfly dampers as such crude and simple units, that differences between suppliers seem of little impact. As the industry leader in innovation and in experience, BDI takes pride in underlining these design features:

  • Oversized stainless steel stub shafts – the shaft is the part of the damper that sees every abuse possible: often exposed to actuator stall torque, radical
    hot-to-cold temperature gradients, acid dew point, etc. BDI considers this a critical item to proper damper operation and longevity.
  • Torque plates and blade designed to resist deflection in torsion – It is not so long since the industry finally embraced the stub shafts as the proper approach to blade thermal challenges but has yet to notice the need for proper blade to shaft attachment. All BDI standard dampers have shaft to blade connections via torque plates.
  • Torque plate “secondary benefit” – for possible upset temperature, explosions or other situations that may expose damper to conditions for which the blade is not
    specifically designed to resist, the torque plate is substituted with two connecting plates bolted to each other. This allows for easy blade replacement without damper removal from the ducting. This feature is standard on larger dampers and offered at no extra cost on smaller units, if requested.
  • Bearing and stuffing box arrangement for the real world – BDI standard bearing mount is 6” away from the damper frame which makes access to stuffing box
    reasonable and insulating over the damper frame more uniform. The triple layer packing can be easily replaced with the damper in operation.
  • Performance calculations and torque requirements – BDI’s extensive and continuously implemented R&D program eliminates guess work and fallacies still
    commonly propagated by some suppliers. Our large database of actual damper testing with digital tension links, pressure blowers, real and simulated loads result in
    empirical formulas that work

Bachmann Dampjoint Inc (BDI) Standard butterfly dampers are:

  • Designed specifically to suit the application
  • Engineered to formulae developed by BDI’s
    unique R&D program
  • All-welded construction for maintenance free operation
  • Made of formed plate, cut with high definition plasma
    for precise interface with existing equipment
  • With stainless, oversized shafts combined with stuffing boxes and external, graphite impregnated bearings
  • With choice of alloys and seals as well as sizes to
    match any ducting

Quite often butterfly dampers face challenges where no standard can be applied. BDI engineering has successfully provided such solutions for most demanding environments:

  • High temperatures – From all alloy construction through water cooled steel to forced air cooled refractory, BDI supplied dampers that are exposed and operating up to 2,400oF.
  • Dusty environments, low velocity – Slow moving, heavy loads often impede blade rotation and prevent proper isolation. The understanding of the applications can save
    weeks of downtime with appropriate design.
  • Dusty environments, high velocity – Even simple dust particles in flue gas can erode typical materials if given sufficient speed. BDI has plenty of experience with suitable
    technology of anti-abrasive coatings, lining and abrasion resistant alloys to build dampers that last.
  • Custom sealing requirements – Besides the typical swing through, metal step, tadpole or knife edge seats, BDI is one of very few manufacturers that offers custom metallic bellows flexible seal for round dampers.
  • Moreover, every one of our butterfly dampers even for the most simple application is entirely custom designed so there is no need to adopt special bolt pattern, flange to flange or breach for welding. We will match your interface requirement, provide suitable lifting points and even supply mating flanges with installation hardware if needed.
  • You may have a location or application where a butterfly damper is not
    suitable but don’t let anyone tell you that some other type of damper is
    better than a properly designed and well built butterfly damper

Bachmann Dampjoint designs and manufactures a multitude of different types of gas-flow dampers in all sizes and configurations. Usually found in heavy utility and industrial plants, Bachmann Dampjoint gas flow dampers, with many cost-effective innovations, are used for isolation, flow control or a combination of both. The blades are actuated by pneumatic, electro-mechanical, hydraulic, or manual drive systems.

Combining efficient seating and rugged design, butterfly and louver dampers are capable of 99.9% shut-off in certain applications. Flexible stainless steel or nickel alloy seals assure long-life and easy maintenance. Elastomeric tadpole seals achieve extremely tight shut-off in low temperature applications. The damper blades are designed to avoid binding even under the differential expansion conditions prevalent in system start-up or shut-down.

Bachmann Dampjoint (BDI) Standard butterfly and louver dampers are:

  • Designed specifically to suit the application
  • Engineered to formulas developed by BDI’s unique R&D program
  • All-welded for maintenance free operation
  • Made of formed plate, cut with high-definition plasma for precise interface with existing equipment
  • Made with stainless steel oversized shafts combined with stuffing boxes and external graphite-impregnated bearings
  • Available with a choice of alloys and seals
View Louver damper type
View Louver damper seal

Dual Seal Dual Skin (DSDS) & Double Louver

Our DSDS design is the best technical and commercial fit for isolation applications where the damper is normally open, and reliability is a concern. The innovative DSDS design is our cost-effective dual-louver solution that is transforming the isolation damper market, specifically in applications where the damper is normally open. It’s no surprise that we have more experience designing,manufacturing and assembling DSDS dampers than all of our competitors combined!

  • 100% isolation
  • Reduced capital cost
  • Low seal leakage

A striking feature of our DSDS damper design is its single row of blades, each with a dual skin. This apparently benign innovation ensures dual seal contacts, and is transforming the isolation damper market because of its significant benefits.

These include:

  • 100% isolation – Indeed, when seal air is used, our DSDS damper allows 100% isolation. If no seal air is used, 99.5% isolation can be achieved.
  • Reduced capital cost – Our Dual Skin design requires fewer materials (half as many shafts and fewer linkages) and less labor (less welding). This is reflected in the very competitive price of our DSDS dampers.
  • Low seal leakage – In our DSDS design, louver shafts do not cross any frame seals, which is the case in all competing dual louver designs. Consequently, seal contact and continuity is increased, leading to lower actual leakage amounts.

Another key advantage is that no seal air is required when our DSDS damper is open. This feature makes our DSDS design ideal for normally open applications, such as for fan isolation inlets/outlets, as well as for FGD inlets/outlets.

There are many benefits to this feature:

  • Mitigation of corrosion issues – Since the seal air system does not need to be continuously “on”, cold air will seldom flow within the damper (only when the damper is shut). Therefore, there is minimal cooling of the damper’s frame by exterior air. Cooling of damper parts can lead to corrosion problems when flue gas temperature gets close to the acid dew point. Our DSDS damper design completely eliminates this issue.
  • Reduced cost of operation – Indeed, with no continuously running fans, operating costs are significantly lower when compared to guillotine dampers, for example, that require constant-running seal air.

Moreover, our DSDS damper is entirely self-contained within the duct, with no cavities. Indeed, there is no protruding damper bonnet, as is the case with guillotine dampers and the frame is engineered not to have any cavities in its normally-open position.

  • Reduction of structural and wind loads
  • No risk of acid condensation and dust accumulation

This has several benefits:

  • Reduction of structural and wind loads – With a self-contained unit, the damper’s center of mass is in the middle of the duct, which reduces wind-related stress loads. In addition, with no bonnet or seal cavity, the DSDS damper frame won’t flex as other damper designs will.
  • No risk of acid condensation and dust accumulation – Our DSDS damper design has no cavity in its normally open position. Therefore, there is no risk of acid condensation and dust accumulation. Furthermore, the need for expensive bonnet insulation or heat tracing is completely eliminated.

Finally, our DSDS dampers have been engineered to be easier to ship and field spliced. This adds to the significant cost advantages over competing designs. As you can see, our DSDS isolation damper design is the best technical and commercial solution for applications where the damper is normally open, and reliability is a concern.

The units are made-to-order according to design criteria, temperature, pressure and material. Circular or rectangular frames are available. 1 model of blade is available: the solid blade. A bonnet ensures a seal between the interior and exterior of the system. Stuffing boxes are used to ensure shaft sealing.

2 types of seats are available: metallic or highflex. The drive system is designed to comply with an adjusted safety factor of between 1.5:1 and 15:1. Slide gate dampers are operated through use of an electric, pneumatic, hydraulic or manual actuator.

  • Mainly used to control flow of raw material in dry material transport systems
  • Can be adapted to a wide range of materials (abrasion, corrosion, heat, shocks)
  • Frame of the slide gate dampers can be adapted to any section of duct with transition fitting, if neccesary
OÀ de nombreuses reprises, Bachmann Dampjoint a conçu et fabriqué sur mesure des registres spécialisés qui ne correspondent pas aux catégories conventionnelles de registres. En tenant compte des exigences exactes de chaque client, Bachmann Dampjoint a conçu l’équipement approprié pour répondre aux besoins spécifiques de chacun.

Parmi les grandes catégories de produits spécialisés, on trouve les équipements suivants : déviateurs de flux, systèmes de dérivation, chapeaux de cheminée, clapets de décharge sous vide, registres anti-refoulement, d’urgence, anti-ouragan et d’admission d’air. De plus, des registres revêtus de réfractaire, refroidis par eau et en alliages à haute teneur en nickel sont d’autres exemples de produits spécialisés développés pour résister à des conditions de haute température, abrasives ou corrosives.

Also known as 3-lever valves, the offset disc damper is used where the degree of tight shut-off required cannot be achieved with a butterfly damper, and where a guillotine damper is not practical.

The seating surface, being uninterrupted for the full 360 degrees around the inside perimeter, provides a full contact area for the blade to seal against, whereas the shafts of a butterfly damper are always a source of leakage due to the discontinuity of the seal at the shaft penetration points.

Due to the lever drive arrangement, torque requirements can be very high for this type of damper. The blade, shaft and lever assembly is therefore designed to accommodate the very large actuators needed to achieve the extremely tight seal these dampers are capable of.

ISOLATION DAMPER

Our Hot Frame Guillotine design is the best commercial and technical fit for isolation applications where reliability is a concern.

Bachmann Dampjoint engineers have been designing and supplying the unique Hot Frame Guillotine to the industry for decades. This proven, rugged design is specifically tailored for isolation applications where reliability and performance are crucial. Our Hot Frame Guillotine damper has two key features: our worryfree flexible-seal combined with our engineered blade design. These two innovations completely eliminate the need for a frame seal cavity and ensure dual seal contacts within the duct. This also allows seal components to be kept entirely inside the duct, where the flue gas keeps them hot – hence the “hot frame”.

Benefits:

  • 100% isolation with seal air
  • Self cleaning blade seal
  • No risk of dust accumulation
  • Mitigation of corrosion issues
  • Increased seal life and durability
  • No bottom frame purge required
  • Reduced capital, operating, shipping and field assembly costs
  • Fully isolated bonnet
  • Low pressure drop
  • Self-cleaning drives with superior reliability

These features have significant benefits:

  • 100% isolation – Indeed, when seal air is used, our Hot Frame Guillotine damper allows 100% isolation. If no seal air is used, 99.5% isolation can be achieved.
  • Self-cleaning blade seal – The dual knife blade end design allows dual seal contact whiler emoving any accumulation of dust, thus guaranteeing isolation integrity.
  • No risk of dust accumulation – There is no seal cavity where dust can accumulate.
  • Mitigation of corrosion issues – There is no “lower temperature” seal cavity where acid condensation can occur.
  • Increased seal life and durability – Our blade seals are engineered for a smaller 1/8” deflection, versus the large forced deflection of 3/8” to 3/4” in conventional guillotine flat plate blade designs. This reduces cycle fatigue stress and increases the lifespan of the seals. Also, mitigation of dust accumulation and acid condensation drastically reduces seal wear.
  • No bottom frame purge required – Since our Hot Frame Guillotines do not have a bottom frame seal cavity, no purge, extra ducting or additional maintenance are required.
  • Minimization of cleaning, maintenance and replacement costs – With reduced wear from corrosion and dust accumulation, our design is truly worry free!

Our guillotines are also equipped with unique bonnet throat seals, which are the top seals where the blade enters the bonnet. These seals are engineered for only end-of-stroke contact and deflection, which significantly extends throat seal life.

In addition, our guillotines have a structurally reinforced blade. With our design, there is no need for internal bracing to control blade deflection, as is usually necessary in conventional flat plate blade designs.

This feature has the benefit of:

  • Reduced capital costs – Less material is required in the Hot Frame’s construction.
  • Smaller pressure drop than a flat plate design – Flat plate blade guillotines require significant grid systems that leads to increased pressure drop. This is not the case with our Hot Frame guillotines.
  • Easily spliced blade – This means that the damper blade can be easily segmented, when necessary. This can have a significant impact on shipping costs and ease of field assembly.

Finally, our design includes a rack & pinion drive, with a rigid chain. This allows our drives to have no flexible parts, eliminating any risks of the chain kinking. Also, our rack and pinion drives are self-cleaning, which is crucial in dusty application. This enables our guillotine design to have superior drive reliability.

As you can see, our Hot Frame Guillotine isolation damper has many features addressing specific application issues. This makes our design the best technical and commercial solution for applications where reliability is a concern.

Flex Seal Guillotine Damper

Our Engineers have been designing and supplying the unique Flex-Seal Guillotine to the Power Industry for over 30 years.

The Flex Seal Guillotine design addresses key issues facing coal fired power plant flue gas isolation applications

TECHNICAL FEATURES & BENEFITS

  • Engineered Blade with thick (6” and up) structural components that allow controlled seal deflection
  • 100% flue gas isolation (Optional Seal Air Fan Required)

Rack & Pinion Drives for Guillotine dampers

Our Rack & Pinion Drive System for guillotine dampers is the best commercial and technical fit for applications where reliability is a concern.

The drive system on our guillotine dampers consists of an electro-mechanical multi turn actuator, which drives the heavy-duty sprockets, keyed to a stainless steel shaft. The stainless steel shaft ensures increased corrosion resistance in the stuffing box areas, preventing rusting-in place for dampers that are infrequently opened/closed. The sprockets engage and move the pin rack(s), which are open, self-cleaning “rigid chain” racks attached to the blade. The rigid pin racks have none of the flexing problems commonly associated with chain drives. The sprockets are facing the blade, thus allowing the free thermal expansion of all components, including the blade. This drive design enables our guillotine dampers to have superior drive reliability, even in the most demanding in high temperature and dusty applications.

Benefits:

  • Self-cleaning drive
  • Superior reliability in high temperature and dusty environments