Segment disc valves work on a very simple but effective principle.
The central throttling element - the segment discs that glide and seal against each other - are positioned in the valve body perpendicular to the flow direction. On a non-rotatable aligned segment disc whose geometry determines the flow rate and characteristic, a movable disc having the same number of segments is shifted by a tangentially engaging rod in such a way that the free cross-sectional area of the segments changes continuously.
The movable segment disc is constantly pressed onto the fixed disc by a spring assembly regardless of the prevailing pressure difference. As a result, the flow direction is variable and the valve can be installed in any position.
This special design makes segment disk valves one of the few valves that combine control precision even in extreme operating conditions with a high seal tightness and very low exposure to wear.