The seal mechanism of the indirect caprocks is pressure seal.

间接盖层的封盖机制为压力封闭。

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Inner row of studs establish the initial seal of the pressure seal joint.

柱头螺栓的内部排列构成压力密封连接的初始密封。

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Carbon, Alloy or Stainless Steel, Pressure seal or Bolted Bonnet Provision for seal Welding on Bolted Bonnet Valves.

碳钢，合金钢或不锈钢，压力密封或螺栓阀帽用于焊接在螺栓阀帽阀门上阀座的设备。

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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.

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The pods are then packed under pressure using carbon dioxide to seal out damaging oxygen.

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Many of the foreign fighters are believed to have entered Iraq from Syria, whose government has been under pressure from Iraq and America to seal its frontiers.

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