... 安全阀 escape valve 安全阀底座 safety valve base 安全阀调整垫圈 safety valve adjusting washer ...
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A calibration valve oil for hydraulic shield safety valves was formulated by a base oilobtalned from the distillate of a deep-refining paraffinic crude with qualified additives.
以深度精制的石蜡基馏分油为基础油，添加具有改善油品性能的添加剂研制了液压支架安全阀校阀油。
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