1. two-slice construction, load-bearing blowout prevention stem, full-bore design, reduced resistance of fluid. 2. The surface and internal of valve body are with epoxy resin coating layer. 3. Stainless steel stem ensure its operation will not be affected by side thrust caused by high-pressure fluid. 4. Stainless steel valve ball reduced parts galling and prolonged service life. 5. PTFE valve seat, adjustable packing nut. 6.two-slice construction permits easy repairing; PTFE valve seat and PTFE packing rod, after removal of valve bonnet assemblies, can be repaired rapidly. Minor seat damage can be removed by lapping.