Abstract: A calibration valve oil for hydraulic shield safety valves was formulated by a base oil obtained from the distillate of a deep-refining paraffinic crude with qualified additives.

• 文摘: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。