1.Body is made of high quality carbon structural steel, the precision casting and become, is suitable for any environment. 2. Work improperness absorption of Germany advanced technology to improve the valve sleeve structure, link is fully enclosed structure,appearance no riveting,seal more reliable. 3. Stem choose fine alloy quenched and tempered steels, surface spraying hard, durable. 4. Standard fasteners are all made of stainless steel materials 304,316,316L Application parameters Environment temperature -50℃-+40℃ Working temperature -40℃-+120℃ Assembly in the open and closed oil pressure 0.6-0.6 MPa, no oil leakage Vacuum test within 10 min steam leakage rate < 1.33 Pa * L/s