求翻译：公司产品包括各种铸铜、铸钢、铸铁、不锈钢的船用中心型蝶阀，双偏心蝶阀，蝶形止回阀，闸阀，通海阀，各种安全阀，减压阀以及滤器，空气管头等各种形式的船用附件。是什么意思？

Products include a variety of cast copper, stainless steel, cast steel, cast iron marine centric wafer type butterfly valves, double-eccentric butterfly valve, butterfly check valve, gate valve, valve for seaward sluice, safety valve, pressure relief valve and filter, accessories for various forms of ship air in first class.