石墨环 meaning in English

graphite annulus

Carbon ring assembly
石墨环组合件
Single set packing : three or four graphite rings between braided rings , 80 - 90 lbs . / cu . ft . density
单填料：在编织环之间放置三个或四个石墨环，密度80 - 90磅/立方英尺。
Precompressed rings . each braided graphite ring is preformed and compressed to 4 , 000 psi ( 275 bar ) at installation to ensure extreme tightness at high packing strain
预压环。每个辫状石墨环在安装时都经过预制和在4 , 000psi ( 275bar )压力下压缩，以保证在包压应变下保持最大的紧固。