You will discover ball valve versions of blended block and bleed valves. These valves are assembled from the finish of the human body and also the ball and seats are retained by an insert. The spindle may well not have packing but 1 or 2 seal rings. A tag should http://valvesandfittings81468.isblog.net/new-step-by-step-map-for-bleeder-valve-11803166