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。