螺母的直螺纹同阀门排气口的配合螺纹咬合在一起并上紧，来压缩在两个密封表面之间的衬垫。
The straight threads of the nut engage with the mating threads of the valve outlet and are tightened to compress the gasket between the two sealing surfaces.
各种径向密封部件放置在突起部件的内表面内以确保密封，且所述密封系统可安装到储存槽的衬垫顶部。
Various radial seal members are placed within the inner surface of the boss member to ensure the seal, and the seal system is installable to the top portion of a liner of a storage tank.
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