阀瓣与阀体密封面经过精密研磨，组装完毕经过100%试压，全部达到零泄漏。
Valve with the valve sealing surface through precision grinding, assembly, after 100% completion of pressure test, all to achieve zero leakage.
阀瓣与阀体密封面经过精密研磨，组装完毕经过100%试压，全部达到零泄漏。
Valve with the valve sealing surface through precision grinding, assembly, after 100% completion of pressure test, all to achieve zero leakage.
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