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Congratulate NSEN VALVE draft the Chinese national standard Posted on: 2019-09-21 16:50:58

Congratulate NSEN VALVE draft the Chinese national standard
《Bi-directional metal to metal sealed butterfly valve for urban heating》.

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Congratulate NSEN VALVE draft the Chinese national standard 《Bi-directional metal to metal sealed butterfly valve for urban heating》.

Congratulate NSEN VALVE draft the Chinese national standard
《Bi-directional metal to metal sealed butterfly valve for urban heating》.