2) packed-type solenoid valve 填料函型电磁阀3) packless valve 无填料阀4) gland glandless pump 无填料函泵5) tank-valve stuffing-box case 柜阀填料函盖6) cable stuffing box 电缆填料函补充资料:溢流阀、顺序阀、减压阀的比较 溢流阀 减压阀 顺序阀