An inert valve, simple in construction but extremely versatile. In standard configuration, wetted surfaces are exposed to borosilicate glass, PTFE and specified o-rings. Operating temperature limits are to 400ºF at full vacuum.
This valve assembly is comprised of a glass body with threads and a drain port, and a valve plug. the stem of the valve plug goes through the body via precision-bore tubing. there are two Kalrez® o-rings on the shaft of the stem, which seal against the ID of the PB tubing. the tip of the plug is equipped with a PTFE encapsulated silicone o-ring for sealing against the valve seat in the vessel.
the nose of the plug is reduced in diameter to provide maximum drainage around plug when valve is opened. the plug has an integral skirt which extends past the open end of the PB tubing to prevent material from entering the tubing and holding up in front of the o-rings.
there are two styles of valve body/plug assemblies. the first ...