高压气体流过密封环顶端并进入其后面，施加向外的压力到缸筒壁上。
It passes over the top of the ring, and gets behind it to force it outward against the cylinder wall.
由于采用内部再循环，IR - CFB设计取消了其它CF B设计所需要的J阀门，环密封，和高压吹风机。
By relying on internal recirculation, the IR-CFB design eliminates J-valves, loop seals, and high-pressure blowers which are required with other CFB designs.
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。
Back-up rings are not seals themselves, but are usually used in conjunction with O-rings in high-pressure applications.
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