... double universal socket；双万向节座 double valve spring；双气门弹簧 double wear；[双面]加倍磨损 ...
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Double spring safety valve 双联弹簧式安全阀
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Double disc check valve consists of body, disc, valve rod and spring and other parts. The valve is designed with slim light weight.
双瓣止回阀主要由阀体、阀瓣、阀杆及弹簧等重要零件组成，并采用薄型轻巧设计。
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