Iris Valves

The Flexible sleeve valve has proved itself over a number of years as a simple, reliable isolation or variable feed control valve on applications in the powder or air handling industries – its simplicity being its major advantage.

The basic construction is a fabric sleeve that, with each end being held firmly to a circular shape on rotation through 180°, will seal against the very finest of powders.

Partial rotation leads to partial opening and a multitude of different types of sleeve can be accommodated, the better type of sleeves are food quality nylon, impregnated cloth. These types of sleeves are weighty, give the valve good full opening properties.

Cast Rotoflex Iris

The Rotoflex is cast in aluminium or stainless steel. It is a high duty, hand operated valve for fine powders on open discharge systems. The Rotoflex lends itself particularly on filling applications. The sleeve is fixed with clamping rings. It can also be used on in-line systems but care must be taken to ensure mating gasket or flange does not interfere with rotating clamping ring. The main advantage of the Rotoflex is that it can be retensioned ‘insitu’. The Rotoflex is available in sizes ranging from 6″ to 12″.

Fabricated Slimflex Iris

The Slimflex is a low cost alternative to the Rotoflex, designed primarily for the needs of the IBC market. It is manufactured from mild or stainless steel laser cut rings providing a robust, yet lower duty valve. Mild steel parts are zinc coated. The advantage of the Slimflex is that any size can be accommodated.