Leaving the valve in a fully closed position helps prevent weld spatter from falling directly onto the mating faces of the seats.

保持阀瓣处于完全关闭位置也能够避免焊花直接掉在阀座和阀瓣的连接面上。

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Leaving the disc in a fully closed position firmly closed also prevents weld spatter from falling directly onto the mating faces of the seat and disc.

保持阀瓣处于完全关闭位置也能够避免焊花直接掉在阀座和阀瓣的连接面上。

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With the valve in the fully closed position the stem length shall protrude a distance of at least twice that of the stem diameter above the top of the mounting flange.

在阀门完全关闭状态下，阀杆在连接法兰顶端上方需高出至少相当于阀杆直径两倍的长度。

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