double walls bellow seal 双层波纹管
spindle with bellow seal 波纹管密封阀杆
Bellow seal valve 波纹管阀门
bellow seal joint 波纹管接头密封件
metal bellow seal 金属波纹管密封
split bellow seal 可拆波纹管式密封
bellow seal globe valve 德标波纹管截止阀
DIN Bellow Seal Globe Valve 产品名称
bellow mechanical seal 波纹管机械密封的
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