Damper: Butterfly Damper (includes HVAC Damper)

Damper:  Butterfly Damper (includes HVAC Damper)

Also known as “Control Damper”

Manufacturers:  Metal: past and present

• Air Balance
• Alan Manufacturing Inc.
• Carrier
• Dayton
• Famco
• Fox Equipment
• GAF: Master Flow
• Greenheck
• Hart & Cooley
• Honeywell
• IB International
• Johnson Controls
• Lennox
• Loren Cook
• Nailor Industries
• Nordfab
• Ruskin
• Southwark
• Trane
• USAire
• US Duct
• Van-Packer
• Ventex

Manufacturers:  Fiberglass: past and present

• Belco: NOV
• Daniel Mechanical
• Dayton
• IPF Colasit (Industrial Plastic Fan) (PVC, PolyPro, and Fiberglass) (founded 1948)
• MK Plastics
• Perry Fiberglass
• Ruskin
• Spunstrand
• Viron

Manufacturers:  PVC: past and present

• Alnor (Europe) (PVC and PPL)
• Harrison Machine & Plastic Corp (PVC)
• IPEX
• IPF Colasit (Industrial Plastic Fan) (PVC, PolyPro, and Fiberglass) (founded 1948)
• Plastec Ventilation
• Ruskin
• Simtech (PVC, PPL, HDPE, PVDF)
• Spears (PVC, CPVC)
• Texcel

Navigate website: links are listed below:    

• 01 Water Treatment: (Random Packing) Packing for Degasifiers (Mass Transfer) (Dump Packing)
• 01 Water Treatment: (Random Packing2) Materials of Construction
• 01 Water Treatment: Accessories for a Forced Draft Degasifier / Decarbonator
• 01 Water Treatment: Accessories for a Spray Tray Deaerators (Industrial)
• 01 Water Treatment: Aeration (Industrial)
• 01 Water Treatment: Air Cooled Condensers Industrial
• 01 Water Treatment: Automatic Self Cleaning Filter-Strainer / Automatic Backwash Filter-Strainer (Municipal / Industrial)
• 01 Water Treatment: Boiler Blowdown Tanks / Blowdown Separators (Industrial)
• 01 Water Treatment: Boiler Tubes
• 01 Water Treatment: Boilers (Industrial)
• 01 Water Treatment: Brine Maker (Industrial)
• 01 Water Treatment: Bubble Cap Trays (Mass Transfer) (Valve Trays)
• 01 Water Treatment: Cartridge Filter Housings (Commercial, Municipal, Industrial)
• 01 Water Treatment: Chemical Test Kits / Water Test Kits
• 01 Water Treatment: Clarifiers (Municipal / Industrial)
• 01 Water Treatment: Condensate Polisher: Demineralizer (Industrial)
• 01 Water Treatment: Cooling Towers (Commercial and Industrial)
• 01 Water Treatment: Dealkalizer
• 01 Water Treatment: Demineralizer (Industrial): Cation, Anion, Mixed Bed
• 01 Water Treatment: Ejectors and Eductors (Jet Pumps) Industrial
• 01 Water Treatment: Exhaust Heads
• 01 Water Treatment: External Vent Condenser
• 01 Water Treatment: Feedwater Heater (Industrial)
• 01 Water Treatment: Flash Tanks (Industrial) (steam)
• 01 Water Treatment: Forced Draft Aerators
• 01 Water Treatment: Forced Draft Decarbonator / Degasifier / VOC Stripper (Industrial)
• 01 Water Treatment: Gravity Sand Filter (Municipal / Industrial)
• 01 Water Treatment: Horizontal Pressure Sand Filters (Municipal and Industrial / Commercial)
• 01 Water Treatment: Internals, Laterals, Underdrain Systems and Resin Traps: Commercial Municipal Industrial
• 01 Water Treatment: Ion Exchange Resin (Industrial): Cation and Anion Resin
• 01 Water Treatment: Lamella Clarifier
• 01 Water Treatment: Membrane Demineralizer / Desalination / (RO) Reverse Osmosis / Seawater Treatment (Municipal and Industrial)
• 01 Water Treatment: Mist Eliminator for Degasifiers / Decarbonators / Scrubbers (Demister Pad)
• 01 Water Treatment: Pressure Leaf Filter (Industrial)
• 01 Water Treatment: Sample Coolers
• 01 Water Treatment: Spray and Packed Column Type Deaerator (counterflow) for O2 Removal (Industrial)
• 01 Water Treatment: Spray Nozzles and Spray Valves
• 01 Water Treatment: Spray Tray Deaerators (Industrial) (Counterflow)
• 01 Water Treatment: Steam Condensers Industrial
• 01 Water Treatment: Steam Tables and Solubility Tables
• 01 Water Treatment: Temporary Strainer Industrial
• 01 Water Treatment: Test Strips for testing of water hardness, iron, chlorine, nitrate, dissolved oxygen, TDS, and other containments
• 01 Water Treatment: Turbines (Industrial)
• 01 Water Treatment: Vacuum Deaerator / Vacuum Degasifier (Industrial)
• 01 Water Treatment: Valve types and valve material of construction
• 01 Water Treatment: Valve: Control Valve for Industrial Water Treatment (Industrial)
• 01 Water Treatment: Water Filters (Municipal and Industrial): Multi Media Sand Filters
• 01 Water Treatment: Water Softeners (Industrial)
• 01 Water Treatment: Whom sold water softeners first in the USA?
• 01b Fluid Treatment: Chlor-Alkali
• 02 Petrochemical
• 02 Petrochemical: Deoiling Hydrocyclones
• 02 Petrochemical: Free Water Knockout Tank – separation of oil and water
• 02 Petrochemical: Heater Treater
• 02 Petrochemical: Sand Separator
• 02 Petrochemical: Vacuum Distillation
• 03 Seawater: Deaerator
• 03 Seawater: Evaporator for Seawater, and other Industrial & Municipal Applications
• 04 Environmental: FGD: Flue Gas Desulphurization
• 04 Environmental: Gas Treatment: Chemical Scrubber (Odor Control)
• 04 Environmental: Gas Treatment: Vapor Phase Carbon Units (VOC Control)
• 04 Environmental: Hydrocyclones (Solids or Particles Separation)
• 1
• About the Author
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• Architecture: Air Curtains
• Architecture: PreEngineered Buildings and Structures (Steel and Fiberglass)
• Bible
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• Cost Estimating
• Cost Estimating 101
• Cost Estimating: (Transportation) Engineers Estimate
• Cost Estimating: (Water and Waste Water) Engineer’s Unit Cost and Cost Study
• Cost Estimating: Buildings
• Cost Estimating: Contractor’s Other Costs
• Cost Estimating: Cost Books and Cost Guides
• Cost Estimating: Cost Estimating Books that PDF versions are online
• Cost Estimating: Department of Transportation Average Contract Cost Data
• Cost Estimating: Discussion Purposes Costs: Concrete
• Cost Estimating: Earthwork Cost Estimating Software
• Cost Estimating: Electrical
• Cost Estimating: Electrical Cost Estimating Software
• Cost Estimating: Engineer’s Estimating Process: Military and Government
• Cost Estimating: Equipment
• Cost Estimating: Equipment (Cranes, Excavators, etc.)
• Cost Estimating: HVAC
• Cost Estimating: HVAC Cost Estimating Software
• Cost Estimating: Mechanical
• Cost Estimating: Prevailing Wages
• Cost Estimating: Rebar Cost Estimating Software
• Cost Estimating: Rough Order Magnitude Estimate: Forced Draft Decarbonator
• Cost Estimating: Rough Order Magnitude: Spray Scrubber Deaerator
• Cost Estimating: Website Pricing, Reference Pricing, List Price Sheets
• Cost Estimating: Weight of Concrete, Metal, Plastics, Resin, and Sand
• Damper (includes HVAC Damper)
• Damper: Butterfly Damper (includes HVAC Damper)
• Donations
• Ductwork Sizing
• Ductwork:  Metal, Fabric, PVC, PPL, and Fiberglass
• Electrical
• Electrical: Alarms, Buttons, Lights, Power Supply, Relays, Sensors, Switches, Terminal Blocks, and Timers
• Electrical: Cable Trays, Ladder Systems, and Raceways
• Electrical: Cables for Computers, Printers, and Networks
• Electrical: Circuit Breaker / Switchgear / Transformer (Industrial)
• Electrical: Conduit
• Electrical: Conduit Hangers and Pipe Straps
• Electrical: Enclosures (Commercial, Municipal, and Industrial)
• Electrical: Explosion Proof Enclosures, Junction Boxes, and Sealing Fittings
• Electrical: Fiber Optics
• Electrical: Motors
• Electrical: PLC Programmable Logic Controller and HMI Human Machine Interface (Commercial Municipal Industrial)
• Electrical: VFD: Variable Frequency Drives
• Electrical: Wire and Cable
• Electronics: Computers, Laptops, and Tablets
• Electronics: FAX
• Electronics: Printers
• Fire Protection
• Generators Temporary (commercial or industrial)
• Guest Article
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• Home
• HVAC
• HVAC Components
• HVAC: Air Conditioning (Commercial and Industrial)
• HVAC: Circulator Pumps
• HVAC: Ductwork
• HVAC: Fan Coils
• HVAC: Fans
• HVAC: Grilles, Registers, and Diffusers
• HVAC: Louvers
• HVAC: Terminal Units
• HVAC: Zone Valve
• info101
• Instrumentation
• Instrumentation: (Chemical) Injection Quill
• Instrumentation: Analyzers for Water Treatment (Commercial / Industrial)
• Instrumentation: Block Manifold, Bar Manifold, and Hydraulic Manifold [for valves, instruments, and other components]
• Instrumentation: Caged Level Switch (stainless steel Float)
• Instrumentation: Calibration Column
• Instrumentation: Deaerator Control Panel
• Instrumentation: Diaphragm Seals (Remote Seals) (Gauge Guards) (Chemical Seal) (Commercial / Industrial)
• Instrumentation: Displacer Controller (Level Control)
• Instrumentation: External Instrument Chamber / Level Bypass Chamber / Water Column / Manifold
• Instrumentation: Flow Switch and Level Switch for Water Treatment
• Instrumentation: Gauge Glass / Level Gauge: Industrial
• Instrumentation: Liquid Level Controller with Float: Industrial
• Instrumentation: Magnetic Level Gauge
• Instrumentation: Manifold Valve
• Instrumentation: Pneumatic
• Instrumentation: Pressure Gauge / Pressure Instrument: Industrial
• Instrumentation: Pressure Switch and Temperature Switch for Water Treatment
• Instrumentation: Sight Flow Indicator for water treatment
• Instrumentation: Thermometer / Temperature Indicator: Industrial
• Instrumentation: Transmitters for Flow Level Pressure Temperature (Commercial / Industrial)
• Instrumentation: Tubing & Instrument Fittings
• Instrumentation: Tubular Borosilicate Glass Tubes
• Insulation for piping, valves, ductwork, tanks, and vessels
• Life Safety: see Fire Protection
• Manholes Concrete
• Pipe
• Pipe and Conduit Hangers
• Pipe Custom Shop Pipe Fabrication (Pipe Spools / Headers / Manifolds)
• Pipe Fittings: Carbon Steel and Forged Steel
• Pipe Flange Gaskets: Gaskets for Flanges in Piping, Valves, Manways, Vessels, and Tanks (Municipal and Industrial)
• Pipe Sizing
• Piping and Fittings: A20 and C20 and Duriron
• Piping and Fittings: ABS
• Piping and Fittings: Aluminum
• Piping and Fittings: Brass
• Piping and Fittings: Bronze
• Piping and Fittings: Clay or VCP
• Piping and Fittings: Copper
• Piping and Fittings: CPVC
• Piping and Fittings: Ductile Iron and Cast Iron
• Piping and Fittings: FRP Fiberglass (Commercial, Municipal and Industrial) (GRP)
• Piping and Fittings: Grooved Systems
• Piping and Fittings: HDPE
• Piping and Fittings: Lexan / Polycarbonate: Tubing and Plate/Machining
• Piping and Fittings: Lined Iron and Lined Steel
• Piping and Fittings: Monel (Alloy 400, 405, K-500)
• Piping and Fittings: PE Polyethylene
• Piping and Fittings: Pex
• Piping and Fittings: PPL Polypropylene
• Piping and Fittings: Pre-Fabricated Manifolds: pre-engineered / pre-manufactured / pre-fabricated pipe-manifolds
• Piping and Fittings: PVC
• Piping and Fittings: PVDF and Kynar
• Piping and Fittings: Stainless Steel
• Piping and Fittings: Teflon (ECTFE PTFE FEP PFA)
• Piping and Fittings: Titanium
• Piping and Fittings: Vacuum Jacketed Piping (Vacuum Insulated Piping)
• Piping: Anodes
• Piping: Brick, Concrete, and Redwood
• Piping: Concrete
• Plumbing:  Safety Eye Wash Station
• Plumbing: Drinking Fountain (and Bottle Filler Station)
• Plumbing: Fixtures
• Plumbing: Hot Water Heater
• Privacy Policy
• Pump: ANSI B73.1 Centrifugal
• Pump: HVAC Circulator Pumps
• Pump: Liquid Ring Vacuum Pump (Industrial)
• Pump: Mechanical Seals for Pumps
• Pump: Pre Designed Chemical Feed System (Pre Engineered)
• Pump: Seal Water System for pumps
• Search Engines: partial list
• Silencer: Silencer / Separator for Liquid Ring Vacuum Pumps
• Silencer: Vent Silencer
• Sitework: Irrigation Systems
• Sitework: Rental of Construction Equipment
• Sitework: Temporary Office Trailers
• Sitework: Trenchless Repair
• Sports and the Water Treatment Industry
• Sports Hall of Fame
• Sports NFL Oldest QBs
• Sports: All Weather Running Track Manufacturers [and Contractors]
• Sports: Books For Sale (Sports)
• Sports: Masters Track & Field
• Sports: Most championships won by a professional athlete
• Structural: Caged Ladders, Platforms and Railings (Commercial and Industrial)
• Structural: Grating and Railings
• Structural: Rebar (Reinforcing Steel)
• Tank
• Tank Sizing
• Tank: Air Receiver
• Tank: Boiler Blowdown Tanks / Blowdown Separators (Industrial)
• Tank: Brick, Concrete, and Redwood
• Tank: Bypass Feeder and Chemical Pot Feeder
• Tank: Coatings (Municipal and Industrial)
• Tank: Condensate Pot, Condensate Chamber, Seal Pot, Seal Pot System, Seal Water Pot
• Tank: CPVC
• Tank: Expansion Tank and Bladder Expansion Tanks
• Tank: Flash Tanks (Industrial) (steam)
• Tank: FRP Fiberglass
• Tank: Guy Wire Kits
• Tank: HDPE
• Tank: Polyethylene (PE)
• Tank: Polypropylene (PPL)
• Tank: Prestressed Concrete Tank
• Tank: Propane Industrial
• Tank: PVC Tank
• Tank: PVDF / Kynar
• Tank: Stainless Steel
• Tank: Teflon
• Tank: Underground Storage Tanks
• Tubing and Fittings: Silicone
• Valve
• Valve: Actuators: Electric
• Valve: Actuators: Pneumatic
• Valve: Angle (Commercial and Industrial)   
• Valve: API6A
• Valve: Backflow Preventer
• Valve: Backpressure Valve
• Valve: Balancing Valves, Suction Diffuser Valves and Triple Duty Valves
• Valve: Ball Check Valve (Industrial)
• Valve: Ball Valve: of Brass or Bronze Body (Commercial Industrial Municipal)
• Valve: Cartridge Valve
• Valve: Constant Flow Regulator
• Valve: Control Valve for Industrial Water Treatment (Industrial)
• Valve: Corporation Valves and Corporation Stops
• Valve: Diaphragm
• Valve: Earthquake
• Valve: Fire Protection Fire Hydrant
• Valve: Flame Arrestor
• Valve: Float & Lever Valves and Lever Valves and Lever Operated Dump Valve
• Valve: Gauge Cock
• Valve: Knife Gate / Slide Gate / Sluice Gate
• Valve: Limit Switches
• Valve: Needle Valves
• Valve: Overflow Traps and Float Type Drain Traps and Mechanical Dump Valve Industrial
• Valve: Pinch
• Valve: Plug
• Valve: Post Indicators
• Valve: PRV
• Valve: Pulsation Dampener and Tank: Surge Control
• Valve: Regulator for Air or Gas or Steam (Commercial / Industrial)
• Valve: Relief Valve ASME Section VIII for steam service
• Valve: Relief Valves
• Valve: Solenoid Valve
• Valve: Steam Solenoid Valve
• Valve: Steam Trap   
• Valve: Thermostatic Mixing Valve
• Valve: Trunnion Ball Valve
• Valve: Vacuum Breaker / Vacuum Relief
• Valve: Water Hammer Arrester
• Valve: Water or Fire Protection Double Check
• Vessels and Tanks: Aluminum
• Vessels: ASME Heads and Manholes for pressure vessels
• Vessels: Rubber Lining of Vessels
• X High Schools in Coachella Valley area
• X Junior High Schools in Coachella Valley area
• x Parks in the Coachella Valley area (partial list)