Valves can also be furnished with flange bolt holes drilled for through bolting, except in the chest area.

阀门也可以配置法兰螺栓孔，用于贯穿式螺栓，但不能穿过阀腔区域。

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ANSI flange sealing principle is very simple: bolt two seal face mutual extruding flange gaskets and formed the seal.

ANSI法兰的密封原理极其简单：螺栓的两个密封面相互挤压法兰垫片并形成密封。

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And, essentially, is one kind of invalid ANSI flange sealed, it needs to put 50% of the bolt load for dummy blocks, and to be used for pressure load of only 50%.

而且，从根本上来说，ANSI法兰是壹种无效的密封，它需要把50%的螺栓负荷用于挤压垫片，而用于保持压力的负荷只剩50%。

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