Needle valves are used in industry to safely isolate or vent pressure gauges, switches or transmitters from the process. The WIKA model IV10 needle valves and the IV11 multiport valves are particularly suitable for liquid, gaseous, aggressive and non-crystallising media, as well as those that are not highly viscous. The IV10 needle valve is available with an optional vent connection, while the IV11 multiport valve is already fitted with two connections as standard. These can be used both for venting and for connecting additional instruments.