ʻO ka 508 kaomi vacuum hoʻokuʻu valve he kūpono ia e hoʻonohonoho ʻia ma luna o ka waihona lehu, i loko o ka mālama ʻana i ka lehu o ka ea, ka overpressure a me nā loli haʻahaʻa ʻē aʻe, e pale i ka waiho ʻana o ka lehu mai ka nui o ka maikaʻi a me ka maikaʻi ʻole, he mea pono e pale ai. waihona lehu.