The top entry ball valve is one piece body in cast steel, which is mainly used in pipeline and industry system and the ball is top entry and easy for online maintenance. They materials are carbon steel WCB, WCC, Low temperature steel LCB, LCC and stainless steel ASTM A351 CF3, CF3M, CF8 and CF8M, pressure ranges from 2" to 36", the design standards are API 6D, GB/T12237, ISO 17292, ISO14313 etc.