如果需要，这种压力等级的阀门也可配置螺旋盘绕或环连接垫圈。
Valves in these classes are also available with spiral wound gasket bonnet joints when specified.
如果用户要求，这些压力等级的阀门也可提供螺旋盘绕或环连接垫圈。
Valves in these classes are also available with spiral wound or ring joint gaskets when specified.
这些表示符号不应放在螺钉、可取下的垫圈或在连接导线时能被取下的其他部件上。
These indications shall not be placed on screws, removable washers or other parts which can be removed when conductors are being connected.
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