The Dyris has proven over the years of manufacture to be an effective solution for the fine control of powdered products.
Unlike other iris valves, the resiliant natural rubber sleeve is not twisted but is clamped by a series of steel 'petals' arranged in a similar fashion to a camera aperture mechanism. In the event that a sleeve is damaged, the valve can still be used until the end of the production run when the sleeve can be changed at a convenient time.
The valve can easily be fitted with a dribble feed mechanism for accurate weighing and dispensing.
A common application for the valve is mounted on big bag dischargers where the positive clamping force of the valve is used to squeeze the sock on a bulk bag to control the flow of powder, especially during the untying phase of the unloading.