Plattco Corporation
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Double Flap Airlock® Valves
H-Series / Premiere Valve
R-Series / Radial Valve
S8-Series / Low Profile Valve
    Product Features
    Plattco’s Mechanical Seal
    Specifications & Drawings
    3D Valve Demonstration
    Product Sheet (PDF)
PCV-Series / Pollution Control Valve

Slide / Isolation Gates
T-Series / High-Cycling Gate
U-Series / Maintenance Gate

Materials / Applications
Success Stories
Capacity Chart (PDF)
Product Installation Manuals
Complete Product Catalog (PDF)



“Since installing Plattco shaft seal assemblies, labor hours on anything related to the seals or bearings has dropped to 0... not counting routine maintenance.

“Needless to say, we are very pleased with the Plattco seals and would recommend using them.”

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The Original and Unrivaled Airlock® Seal
Shaft seal assemblies that outperform all others.

Our patented high-pressure mechanical seal puts Plattco valves in a class all their own when it comes to the most effective seal available.

To eliminate shaft seal problems, companies count on Plattco to:

  • provide a true Airlock® Seal that is never broken at any time during the valve cycle sequence;
  • attain unbeatable valve performance even when the material is abrasive or corrosive, pressurized or subject to extreme temperatures; and,
  • realize considerable maintenance cost savings and improved production capacity.

Plattco’s High Pressure Mechanical Seal
When maintaining a seal is critical to your process, the High Pressure Mechanical Seal of Plattco valves are absolutely unbeatable.

Excellence in Design

  • Eliminates damage caused by air cutting.
  • Seals up to 40 psi.
  • Replacing shaft seal packing is no longer needed.
  • Requires no scheduled lubrication or maintenance.
  • No air is needed for shaft seals.
  • Easy to replace.
  • Features a self-contained cartridge.
  • Seal can be factory rebuilt for many more years of superior performance.
  • Eliminates environmental issues.
  • Sealing performance is inherent in Plattco’s design and assured by attention to precision engineering.


We’re extremely proud of the cost-savings our customers have realized with the true seal of a Plattco valve. Let us talk to you about the difference we can make in your operation! Contact us today!




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Plattco Corporation is the recognized leader for valves that solve material handling problems in a wide variety of industries. Plattco specializes in the design and manufacture of Double Flap Airlock® Valves and associated multi-purpose slide gates as an important part of dry material handling systems.

Industries / Applications For demanding conditions, Plattco valves are the ideal choice when you need a seal that performs, including Precipitator, Baghouse, Clinker Cooler, Cyclones, Ash Handling, Air Heater Hopper, Burner Chute, Bulk Handling, CFB Boiler, Dust Collector, Grinding Mill, Kiln, Preheater Hopper, Pneumatic Conveying, Screw Pump Replacement, Spritzer Trap, Vacuum Systems, Filter Receivers, Classifiers, Alternate Fuel Feed Airlock, Storage Silos, Cooling Towers, Air Slides, Conditioning Towers, Coal Mill Feeder, Construction, Boiler Feed, Coal-fired Power Plants, Fluid-bed Boiler Discharge, Pressure Transport Systems, Waste to Energy, Positive Pressure Conveying Systems, ESP Valves, Dust Collection, Superheaters, Scrubber Discharge, Boiler Bypass, Higher Temperature, Kiln Cyclone Airlocks, Reactor Valves, Energy & Incineration, Mining, Pollution Control, Environmental Systems, Recycling, Gasification.

Materials / Media Plattco built its reputation on reliable, resilient valves that tackle the toughest conditions. If you have a highly-abrasive, high-temperature material, there is no better choice than Plattco. We have more than 50 years experience handling Aggregate, Alumina Chips, Alumina Powder, Alumina Rocks, Animal Feed, Asphalt, Glass Beads, Metal Beads, Plastic Beads, Broken Glass, Bulk Powder Solids, Carbon Ash, Casting Sand, Cement, Finish Cement, Raw Cement, Dry Chemicals, Clinker Dust, Coal, Coal Dust, Concrete, Corn, Crushed Glass Dust, Fiberglass Dust, Fiberglass Granules, Fly Ash, Foundry Sand, Glass Furnace Dust, Graphite, Gypsum Rock, Gypsum Pellets, Kiln Dust, Lead, Lead Chips, Lead Powder, Metal Powders, Metal Shavings, Minerals, Paper Pulp, Quarry Dust, Rocks, Silica, Soybeans, Soy Flour, Stone, Stone Dust, Styrofoam, Talc, Tungsten Carbide, Waste Material, Wheat, Wood Chips, Wood Dust.

Equipment / Industry Terms With the number of products Plattco carries and the industries we serve, there are various terms which may apply, including: Double Flap Gate Valve, Double-Flap Airlock® Valves, Double Dump Valves, Airlock Valves, Plattco's, Industrial Valves, Metal Valves, Air Valves, Double Flap Airlock Valves; as well as, Material Handling Gates, High-Cycling Gates, Isolation Gates, Maintenance Slide Gates, Gate Valves, Knife Gates, Knife Gate Valves, Slide Gates, Slide Valves, Low Profile Gates, Multi-purpose Gates and Feeder Gate Valves.

To determine the ideal Plattco valve for your demanding conditions, contact us today.