... 阀防油罩 valve oil shield 球状阀注油器 ballvalveoiler 放泄阀泄水阀泄油阀 drainingvalve ...
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valve stem oil shield 气门杆润滑油防护板
engine support oil shield valve 发动机阀
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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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