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.

Ball 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.

Butterfly 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.

Slide 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.