1.Design to API 6D, 2.Fire tested to API 607, 3.Soft or metal to metal sealing, 4.Self ... floating ball type, trunnion ball type, high, middle and low pressure, high, middle and low temperature, sulphur-resistant and non-sulphur ... valve by valve type.2,All the valves have suitable design structure and advanced military manufacturing technique. 3,Valve teat is ...