时间一长，会使主封油变形，降低密封效果，甚至失去密封功能。
After a long time, the main oil seal can be deformed; sealing effects can be reduced, and sealing functions can be even lost.
本实用新型的保温杯具有双重密封功能，可提高保温杯的保温的防漏性能。
The thermos cup of the utility model has a double-sealing function, which can enhance insulation and leakage-proof performances of the thermos cup.
即使在最低的管线压力下，闸板与阀座之间的配合也能够实现气泡级密封功能。
The interference fit between the gate and seat provides bubble tight shutoff even under the lowest pressure.
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