About Sincere-Electrical & Mechanical Sincere manufactoring HVAC products. Valve system: Gate valve, Globe valve, Check valve, butterfly valve and Ball ***** The materials for the valves are Carbon steel , Alloy steel.We also can provide *****, etc Our product has good quality and reputation, widely used in petroleum, chemical industry, boiler, power station, metallurgy About Sincere- Casual living Sincere has been offering top quality lines of cast aluminum and cast iron casual patio furniture for many years. We commitment to innovative and original designs. Sincere gives you new and exciting opportunities to enjoy outdoor living. We gives you a wide variety of entertaining options – comfortable deep-seating groups, outdoor chat groups, outdoor bar sets and accessories to complement any décor. Your imagination and your style come to the fore when you add Sincere to your home.