In some special occasions for metal hard seal butterfly valve seal put forward higher request, must be two-way under pressure.
在一些特殊场合对金属硬密封蝶阀的密封提出了更高的要求，必须双向承压。
Now gate valves have been replaced by eccentric metal hard seal ball valves in the construction of some new unit and old unit revamping.
偏心金属硬密封球阀已在一些新装置建设和老装置改造中取代了一部分闸阀而得到应用。
Generally use the soft rubber type sealing ring seal, hard seal ring-type metal seal used.
软密封型一般采用橡胶环密封，硬密封型通常采用金属环密封。
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