Control type: normally closed, normally open, double acting.
控制形式：标准常闭、常开、双作用。
These valves can be normally closed, normally open or universal.
这些阀门可以常闭，常开或普遍。
Limit switch, directly actuated, spring returned, normally closed.
直接启动、弹簧复位、正常闭合的限制开关。
Limit switch, directly actuated, spring returned, normally closed.
直接启动、弹簧复位、正常闭合的邻近限制开关。
Usually divided into normally open, normally closed and self-holding three.
通常分为常开型，常闭型和自保持式三种。
Limit switch, directly actuated, spring returned, normally open. Right-click for open or held closed.
限制开关，直接启动，弹簧复位，正常情况下为断路。右击断开或保持闭合。
Limit switch, directly actuated, spring returned, normally open. Right-click for open or held closed.
限制开关，直接启动，弹簧复位，正常情况下为断路。右击断开或保持闭合。
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