Positive mechanical thrust drives plug into body seats to ensure tight bi-directional line seal.

积极的机械推力驱动阀塞进入阀体阀座馁，确保紧密双向管路密封。

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The tapered plug is precision ground from hardened high alloy material or an overlaid stainless to assure a tight seal and easy operation.

锥形阀塞经过精密研磨，采用硬化高合金材料或一种镀层不锈钢，确保紧密密封和操作容易。

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Pump shaft seals use mechanical seal, pump top and bottom, respectively, equipped with water injection plug and the drain plug.

泵的轴封采用机械密封，泵体顶部和底部分别装有注水、放泄的螺塞。

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It aims only to drill down to 1, 400 feet beneath the seafloor, then plug and seal the hole for reentry next year.

FORBES: After Mishaps, Shell Dials Back Arctic Oil-Drilling Plans

Given the two red flags that had been thrown up previously, one would have expected that as a precaution a cement plug would have been placed somewhere in the wellbore as a secondary pressure seal before this primary pressure control system (heavy mud) was evacuated from the wellbore.

WSJ: The Oil Disaster Is About Human, Not System, Failure