Italvalvole Sas by Spadon Oscar & C.

Control valves

The control or modulating valves are devices that are used to control the flow rate of the fluid during the industrial process. All this takes place by adjusting the shutter position between the valve's opening and closing position.

The valves' control can be linear or of equal percentage. There is an increase in the flow rate following the steady increase of the valve opening in the linear control for the entire stroke of the valve itself. Whereas with the equal percentage, the flow increases as a result of the increase of the valve opening and in proportion to the flow itself, thus obtaining the possibility of adjusting the minimum flow in the first part of the valve stroke and modulating those higher in the final part of the stroke.

The opening, closing, and modulating action of the valve are produced by the variation in the pneumatic signal which reaches the servomotor (valve pneumatic cylinder head). The diaphragm/spring combinations provided within the valve's pneumatic cylinder head cover different input signal ranges on the diaphragm.