The Vortex® Iris Valve opens from and closes toward the center of its opening to create a gradual flow or restriction of materials. This design ensures an even discharge of materials and allows manual control over flow rates. The Iris Valve’s fabric sleeve and gradual closing action protect delicate and friable materials from degradation. When fully closed, the Iris Valve’s fabric sleeve is twisted to the point that it becomes a flat, tight barrier to hold back materials.
Ideal application: Bulk bag unloaders and applications requiring manual control of gravity discharged, free-flowing dry bulk solid materials.
Optional preset positions for quick adjustments in material flow rate
Control ring constructed from stainless steel, for increased torque and added durability
Optional replaceable wear liner reduces material contact with the sleeve to extend service life
Sleeve is inexpensive and easily replaceable
Flange options to matchup with equipment above the valve
Optional double sleeve to better manage fine materials and dusts
Control ring is precision-machined for quick, smooth actuation and to prevent binding and galling
Optional double sleeve configuration
Ideal for handling delicate or friable materials
FDA-compliant materials of construction
Gravity flow only
Non-abrasive to moderately abrasive powders, pellets and granules
4 – 18 in | 100 – 455 mm
2 in | 40 mm
2 – 75 lb | 1 – 35 kg
Standard flange or tube stubs
Ferrule-type fittings available by request
Up to 150°F | 65°C
Material Bulk Density
Up to 40 lb/ft3
Contact us to discuss options forgreater bulk densities
Aluminum, 304 or 316L stainless steel
Sleeve Material Options
Urethane, silicone, Buna-N nitrile rubber, PTFE, static dissipative
Control Ring Construction
Visual indication via handle position
ATEX Zone 20 (internal), ATEX Zone 21 (external), FDA
All stainless steel material contact components are 304 alloy.
All stainless steel material contact components are 316L alloy.
FDA compliant 2.5 oz. silicone coated sleeve
Sleeve is a 4 oz. nylon that is urethane coated.
Sleeve is an 8 oz. nylon that is Teflon coated.
Optional bolt hole pattern is specified.
*Additional modifications available based on application.
Vortex Iris Valve vs. Alternatives
• The Vortex® Iris Valve is designed with a form-fitted fabric sleeve that creates a barrier to prevent material leakage to atmosphere. The fabric sleeve also prevents materials from coming in contact with the valve's moving parts. With several sleeve material options available, an Iris Valve can be designed for most dry bulk solids material handling applications, including abrasion-resistant and food-friendly, among others.
• Many alternative iris valves are constructed with plastic control rings, trigger locks and handles. Such construction renders iris valves nondurable and unreliable. To address these durability concerns, the Iris Valve is constructed with a stainless steel control ring, as well as a metal trigger lock and a metal handle.
• The Iris Valve is constructed from precision-machined parts, to reduce wear and ensure smooth actuation.