The Roto-Disc® Advantage

Want to solve a troublesome valve installation once-and-for-all?

Roto-Disc, Inc. has been making valves, airlocks and diverters for difficult dry and slurry material handling applications since 1984. Our valves are designed specifically for dry material and overcome the natural weaknesses of other valve styles while handling even the most difficult applications. With thousands of successful installations handling hundreds of types of materials, you can trust that Roto-Disc will solve your valve problems.

Roto-Disc valve fully open

Roto-Disc totally open:

Material falls unobstructed through the inlet opening. Nothing is in the flow stream to cause product bridging, so you get the full flow capacity of the valve. Notice that the sealing surfaces are protected from direct contact with material.

Roto-Disc valve closing

Roto-Disc closing:

As the valve begins to rotate closed, the dome wipes against the seat, cutting off the flow of product and pushing material above or below the valve instead of wedging it between the dome and seat. The design naturally resists abrasive wear and there are no pinch points or places for material to hang-up.

Roto-Disc valve fully closed

Roto-Disc fully closed:

Closure is clean and the valve is fully seated. The dome and seat form a positive seal that eliminates leakage across the seat. Double O-rings prevent leakage through the stems.

In Comparison

Troublesome valve installations can cause “off spec” product, require constant maintenance and restrict production time. Other valve styles, some of them originally designed for liquid handling, have shortcomings, as shown below.

valve type comparison: Ball ValveBall valves were developed over a century ago for liquids and gasses. They are heavy and take up a lot of headroom. More importantly they have a dead space between the casting and ball that can fill and pack with product causing abrasive wear on the seals and ball or causing cross contamination/spoilage between batches.

valve type comparison: Butterfly ValveButterfly valves have a vane in the center of the flow stream that can cause bridging and obstruct product flow. Since the seat and the vane are exposed they can wear quickly, making them unable to seal.

valve type comparison: Slide GateSlide gate valves can pinch and/or cut product, jamming the valve so it won’t close completely. The linear motion of the valve can drag material across the seal, causing wear and allowing product to leak out thru the sliding seal.

Typical Applications

Roto-Disc® valves handle a wide range of dry and slurry material in many different applications. Here is just a sample of the many diverse valve installations:

Manufacturer Type Material Application
General Chemical Potassium Tantalum Isolation Valve
General Chemical Silica Gel Dense Phase Pneumatic Conveying
General Chemical Hydro Bromine Salts Line Shut-off
General Chemical Zinc Stearate Reactor Fill/Shut-off
General Chemical TiO2 Silo Discharge
Alternative Energy Crumb Rubber Lock-hopper Valves
Diversified Food Cake Frosting Mixer Discharge
Diversified Food Maltodextrin Control Valve
Major Pharmaceutical Pharmaceutical Powder Vacuum Dryer Discharge
Major Pharmaceutical Pharmaceutical Powder Centrifuge Discharge
Biofuels Rapeseed (Canola) Gasification
Aggregate & Mining Aluminum Silicate Powder Silo Discharge
Agricultural Processor Poultry Biocide Nauta Mixer Discharge
Agricultural Processor Corn Gluten Weigh Bin Fill
Batteries Magnesium Dioxide L.I.W. Feeder Refill
Bio-pharmaceutical Dried Milk Formula Air Lock (Double-dump)
Coal Fired Power Plant Hot Fly Ash Bag House Discharge
Flavorings & Spices Powdered Flavoring Mixer Discharge
Flavorings & Spices Salt & Seasoning Ribbon Blender Discharge
Petrochemical Catalyst Reactor Fill/Shut-off
Petrochemical Polyester Chips Reactor Fill/Shut-off
Petrochemical Plastic Pellets L.I.W. Feeder Refill
Glass Products Glass Batch Hopper Discharge
Hazardous Materials Recycling Broken Glass Roaster Inlet & Discharge
Plastic Pellet/Resin ABS Powder & Pellets Box Filling
Nuclear Fuel Reprocessing Uranium Pellets Air Lock (Double-dump)
Nuclear Waste Processing & Disposal Uranium Oxide Powder Air Lock (Double-dump)
Oil Field Services Deep-sea Drill Cuttings Dense-phase Conveying
Pigments Color Pigments Nauta Mixer Discharge
Specialty Chemical Ceramic Balls Air Lock (Double-dump)
Specialty Chemical Sulfamic Acid Reactor Fill/Shut-off
Powdered Metals Metallic Brake Shoe Fibers Mixer Discharge
Powdered Metals Titanium Sponge Air Lock (Double-dump)
Original Equipment Manufacturer Activated Carbon & Polymers Mixer Discharge
Original Equipment Manufacturer Cigarette Additive L.I.W. Feeder Refill
Pet Food Cat Food Hopper Shut-off
All Roto-Disc valves are designed and manufactured exclusively in the U.S.A.