在活塞环的内侧设置金属的弹力环增加非金属活塞环的预弹力，可到达预期的密封效果。
Metal elastic force ring inside piston rings can add initial elastic force of the non-metallic piston ring to get expectative seal effect.
它被介电感应高温密封，如果一个投掷节在里边被紧紧地拉伸，然后被释放，它足够有弹力能产生一个密封的封印。
It was sealed by dielectrically induced heat and was sufficiently elastic to yield a hermetic seal if a single throw knot in it were stretched tightly and then released.
同时介质压力与上游端挠性结构的回弹力又增加了下游端阀座的密封。
While medium pressure and the upstream end of the resilient and flexible structures to increase the downstream end of the valve seat seal.
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