... sealed-off counter 封离计数器 ; 密封计数器 sealed-off light valve 密封光阀 sealed-off vacuum degree 封结真空度 ...
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At present the use of the butterfly valves for more than soft sealed off valve, characterized by simple structure, light weight, easy maintenance, construction costs low;
目前使用的蝶阀多为软密封蝶阀，其特点是结构简单、重量轻、维修方便、成本造价低；
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