To improve the service life of the newly designed pneumatic downhole motor. a kind of commercially available lithium complex grease was used to help avoid the rapid wear-induced failure of the dynamic seal of pneumatic downhole tools in operation. The investigation on the tribological behaviors of QBe2 beryllium bronze and 38CrMoAlA steel tribo-pairs in pneumatic downhole motor reveal... https://mabelandfoxs.shop/product-category/kids-backpack/