Power supply systems and configurations in electro-hydraulic control systems of powered support are presented. 介绍了各种液压支架电液控制系统的电源配置方式。
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。
