Salient Feature Meets design requirement of ASME B 16.34 / API 600 / API603 /API 6D and testing requirement API 598 / BS 6755 / API6FA / ISO 5208 Outside Screw and Yoke Construction Valves provided with back seating arrangement Solid, flexible, split wedge and parallel slide are available Renewable, seal welded seat ring or integral seat ( Cast SS. only ) available. Specially designed die formed graphite packing, controlled clearance between stem, gland and bonnet bushing for guaranteed low emissions meet 100 PPM maximum fugitive emission levels. Anti – friction ball thrust bearing in yoke sleeve for higher size and classes