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Louver dampers employ fast acting single or dual rows of rectangular blades, mounted within a rigid frame for installation in round and rectangular flanged ducting. Louvers are particularly well suited for flow modulation, bypass, isolation and backflow prevention applications.
Applications
- Pressure control
- Fan isolation
- Combustion air control
- HRSG flow control
- Fan inlet spin control
Pathway Performance Advantages
- 99% sealing efficiency with standard structural seal
(99.5% with optional jamb seals and blade edge seals)
- Low pressure drop airfoil blade design
- Superior flow and pressure control with opposed blades
- Superior flow isolation and fan spin control with parallel blades
- High structural rigidity to eliminate frame distortion and blade jamming
Standard Design Features
- Welded monocoque airfoil blades
- Fixed linkage employs hardened steel pivots with thin-film PTFE (Teflon®) bushings
- Ball bearings on blade shafts
- Shaft seal gland consists of two compressible rings mounted separately from bearing
- Actuator is mounted directly to driving shaft, reducing frame flex and hysteresis
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200 Series
Guillotine
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Guillotines employ a sliding blade inserted into the duct from an external frame to block flow in rectangular and round ducting. Guillotines provide a mechanized means of inserting a duct blanking plate and offer superior isolation of flue gas applications containing heavy particulate loads and are ideal for tight shut off applications.
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Applications
- Scrubbers
- Precipitators
- Oxidizers
- Bag houses
- Heaters
- Incinerators
- Boiler breaching
- Burner fuel lines
- SCR’s
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Pathway Performance Advantages
- Low pressure drop due to full blade retraction from flow stream
- Dual chain or rack and pinion drive designed for actuator maximum stall output
- Reliable man safe isolation with optional seal air system
Standard Design Features
- Self cleaning blade seats for 99.75% sealing efficiency
- Self lubricated sleeve bearings
- Maintenance-free drive design
- Corrosion resistant drive and follower shafts
- Clean out access
- Actuator is directly coupled to the drive shaft
Options
- Push rod/chest style for high temperature or pressure
- Spectacle designs
- Enclosed bonnets
- Dual blade
- Seal air systems
- Position indicators
- Instrument ports
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300 Series
Butterfly
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Butterfly dampers have broad application versatility by employing a center mounted rotating disc that produces near equal flow characteristics on each side of the blade for modulating applications, while offering a simple and reliable means for on-off shutoff service.
Applications
- Thermal oxidizers
- Fan inlet flow control
- Stack isolation
- System isolation
- Boiler breaching
- Incinerators
- Combustion air
- Pressure relief
Pathway Performance Advantages
- Solid disc resists thermal and mechanical deformation
- Precision aligned stub shafts welded to blade
- Frame is externally seal welded to prevent crevice corrosion
- A variety of seal designs
Standard Design Features
- Four bolt ball bearings on blade stub shafts
- Shaft seal gland consists of two compressible rings mounted separately from bearing
- Swing through blade design with 98% isolation efficiency
Diverter dampers are available in three configurations: butterfly tee, multi-louver and flap diverter. Tee diverter dampers extend the capabilities of the butterfly damper design by combining two butterfly dampers into a common wye or tee fitting, primarily for isolation/bypass applications. In a wye configuration, diverters can allow synchronized actuation of each blade for the purpose of splitting and modulating flow. Flap diverters are designed to provide up to 100% sealing efficiency while minimizing heat loss and pressure drop. They are ideally suited to isolate waste heat recovery units on gas turbines.
Applications
- Flow bypass
- Gas turbine
- HRSG bypass
- Diesel exhaust
- Stack diversion
- Tempering air
pathway performance advantages
- Solid discs resist thermal and mechanical deformation
- Precision aligned stub shafts welded to blade
- Frame is externally seal welded to prevent crevice corrosion
- A variety of sealing designs to meet specified isolation efficiencies standard design features
- Maintenance free high temperature bearings
- Shaft seal gland consists of two compressible rings mounted separately from bearing
Options
- Bulb on step seat for 99.75% isolation efficiency (butterflies)
- Patented and adjustable machined seal seat for 99.85% isolation efficiency (butterflies)
- Stack damper designs
- Flap style with vent/purge for 100% isolation efficiency
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500 Series
Poppet Valve
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Poppet valves employ a seal disc that is capable of extremely rapid actuation and used in critical gas ducting applications that require rapid diversion or isolation of gasses.
Applications
- Isolation of a single duct (two-way)
- Control flow from one gas path to either of two new paths (three-way)
- Control flow from two gas paths to either of two new paths (four-way)
Pathway Performance Advantages
- 99.9 to 100% sealing efficiency
- One second or less cycle time standard design features
- Stainless steel push rod and seal disc
- Self aligning seal disc
Options
- Configuration options (2-way, 3-way or 4-way)
- Pneumatic or hydraulic actuation
- Controls
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600 Series
Solids Handling
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Fabricated gate valves are used in solids material handling applications with erosion and high head pressures.
Applications
- Coal valves
- Fly ash
- Cement
- Pneumatic conveying
- Material silo piping
- Metering applications
- Food service/manufacturing
Pathway Performance Advantages
- High abrasion resistance
- Heavy duty, shielded blade seat
- Low blade friction
- Large seal contact area
- Fabricated construction eliminates costly castings and casting size restrictions standard design features
- Maintenance-free seat
- Full port throat design options
- Actuators
- Controllers
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