Type ULTRASTAR is Starline Trunnion mounted valve design. Range of Ultrastar cover sizes from ½" to 8" on ratings 150 - 2500lbs. On this valve design Starline has a special execution according to API 6A on pressure ratings API 3000 - 5000 - 10000PSI. Main features of this construction are: Double seal soft insert seats automatic relieving in case of body over pressuring Double block and bleed. High integrity shut-off at low and high pressure. Floating seats spring energized.