1).API STANDARD 2).SAFE,RELIABLE AND EFFICIENT 3).DELIVERY ON TIME. 4).COMPETITIVE PRICE ALL DEPENDS ON ENOUGH CREDIBILITY. Construction : 1).5,000psi2).10,000psi3).15,000psiDescription :One piece kelly valve is designed to provide a positive seal in the event of a kick and can be used as an upper kelly valve ,lower kelly valve ,safety valve ,or mud saver.Main Models:O.DI.DUpper BoxBottom ...