SS-6DBS12MM stainless steel xenophobic needle valve needle valve spool is a very sharp cone, as if the same needle is inserted into the valve seat, hence the name. ? Needle valve than other types of valves that can withstand more pressure, good sealing performance, it is generally used to seal small flow, high pressure gaseous or liquid medium. ? Needle valve and pressure gauge with the use of the most appropriate, and generally are made of needle valve threaded connections (flange and of course there are other forms of connection).