船用日标铸钢30K空气阀（铸钢30K直通/直角空气阀JISF7475F7340)船用日标法兰铸铁截止阀/截止止回阀JISF7305F7306F7307F7308F7377F7388F7309F7310F7310船用法兰铸钢截止阀/截止止回阀JISF7311F7312F7319F7320F7313F7314,公称压力；PN5K10K16K20K30K40K,适用介质，海水，淡水，滑油，不高于300℃的水蒸汽。JISF7301F7302F7303F7304F7351F7352)