使用在弯曲连接器的安全螺栓必须用双螺帽固定住。
The bolts at bent links of safety chain should be secured by double nuts.
松开沟槽连接器上的螺栓,从阀体上拆卸沟槽连接器和盖板。
Loosen bolts on groove coupler and remove groove couple and cover plate from valve body.
松开沟槽连接器上的螺栓,从阀体上拆卸沟槽连接器和盖板。
Loosen bolts on groove coupler and remove groove coupler and cover plate from valve body.
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