A helium line unexpectedly vented, eventually leading ground support crews to a ring that had come loose from a seal.

一根氦管路意外泄露，最后地面支持人员发现问题源自一个松动的密封环。

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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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Seat rings are long to compensate for temperature fluctuations and are seal - welded. seating faces are hardfaced with stellite 6, ground and lapped to mirror finish.

阀座环较长，并且是密封焊接的，能够补偿温度波动。阀座面用钨铬钴合金6硬化， 研磨和层叠为镜面光洁度。

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The drainage will help disperse excess ground water and a specialist flexible waterproof liner mat will be used to re-line and seal the canal.

BBC: Work starts to repair breached Trent and Mersey Canal

The team checked the responses of seal mothers by recording the number of pup checks made (where the mother raises her head off the ground and moves it in the direction of her young to check their well-being) during a specific time period.

BBC: Seal pup