V-port ball valve is designed for control applications of various medium like liquids, pulps and steam. It is used for sticky and crystallizing mediums, because of cleaning function of metal seat for both control and on/off applications where standard PTFE seated valves does not lasting. If the medium contains solid particles, the geometry of metal seat and segment will warranty better function as standard valves. These valves are tight to one direction which is shown by an arrow according to EN 12266-1. The wafer pattern ball sector valve is a reduced bore valve manufactured in stainless steel throughout with a hard chromed ball sector and Stellite or PTFE seat. The V-port gives an excellent control characteristic which is intermediate between linear and equal percentage. The shaft packing box has tight able graphite seals.