An iris valve is used to control the flow of bulk solid materials. It consists of a flexible cylindrical sleeve, a control ring, and a polymeric isolator disc. Rotating the control ring twists the flexible sleeve in an iris pattern to close an opening through the valve. Clamp bands attached to the upper body member and control ring include a machined helical pattern to securely grip the ends of the flexible sleeve, and a threaded handle locks the control ring in place against the body members.
Iron Core Reactors with coils consist of small wires, straps or cables wound about an iron core. This reactor is designed considering higher harmonic losses. These are designed with lower flux densities and are in smaller in dimensions. An applications of iron-core reactors are to increase the reactance of one branch of parallel circuits so the load will divide properly among the branches, to compensate for the leading charging current of a long transmission line as when used for shunt reactors operating at nearly constant voltage and to limit the current of an arc furnace transformer. These reactors are used in various branches of electrical engineering.