Back-up rings are not seals themselves, but are usually used in conjunction with O-rings in high-pressure applications.

备份环本身不是密封件，通常在高压应用中与O型圈配套使用。

youdao

Back-up rings are not seals themselves, but are usually used in conjunction with O-rings in high-pressure applications.

备份环本身不是密封件，通常在高压应用中与O型圈配套使用。

youdao