... out Proof Stem5. Fire Safe Design6. Emergency Sealant Injector7. Vent Valve, Drain Valve8. Lifting Lugs and supporting feets STANDARD ... which integrates R&D, manufacture and sales. The company covers total area of 220,000 m2, now has 252 staff ... C. The valve material contains carbon steel, brass, stainless steel, heat-resist alloy steel, Monel, low-temperature steel and other special steels. WEILAN' ...