... Actual Units Produced(Previous Year) Gate valve, Check valve, Globe valve, Butterfly valve, Ball Valve USD 24 ... Valves & DN700, Butterfly Valves & DN2000, Ball Valves & DN200, Check Valves & DN350 2012/01/11 --- 2049/12/31 API American Petroleum Institute 6D-0732 Gate Valves, Ball Valves, Check Valves ... 2015 Gate valve, Butterfly Valve, Ball Valve, Check Valve, Globe valve 2011/04/28 --- 2015/04/27 ...