1.Design to API 6D, 2.Fire tested to API 607, 3.Soft or metal to ... temperature, sulphur-resistant and non-sulphur- resistant valve by valve type.2,All the valves have suitable design ... advanced military manufacturing technique. 3,Valve teat is so strict that each valve is tested, measured,and the ... results are recorded for quality-tracing. We adopt the latest standard ...