valven.瓣膜；真空管；阀门；电子管valve tool气门保修用机具valve case阀心座,活门体valve area瓣膜区,气门开启最大面积valve typeadj.电子管式的valve disk阀门片valve seal阀门密封,气门杆密封圈,阀止水Valve zone气门环带valve face阀面,气门面valve guard阀片升程限制器,阀档板,阀挡,阀柱护套valve tower浮阀塔,分水塔

1. 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。