Control type: normally closed, normally open, double acting.
控制形式：标准常闭、常开、双作用。
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. Switch can be specified as open or closed.
限制开关，直接启动，弹簧复位，正常情况下为断路。可指定开关为断开或接通。
The same set of system (double speed) is used for usual ventilation and smoke extraction in case of fire accident, so the air intake is set as normally open.
平时通风和火灾时排烟共用一套系统(双速)，故风口设置为常开型。
Means need 25a contactor, main contact are three normally open, auxiliary contact is one normally open, control coil voltage is DC 110v, order volume is 20 sets.
表示为25a接触器的主触头为三对常开，辅助触头为一对常开，控制线圈的电压为直流110v，订货数量为20台。
FS remote contact module with remote contact base, can be selected according to the actual needs of the terminal 1-2 (normally open) or 1-3 (normally closed contact).
触点模块附带遥信触点功能底座，可根据实际需要选用端子1-2（常开触点）或1-3（常闭触点）连接。
The contact point is in a normally open state, namely, while the disc is closed, the contact point of the electric control device is closed, and in a power-on state, it sends out electric signals.
触点处于常开状态，即阀瓣关闭时，电控装置触点闭合，在通电状态下给出电信号。
Options include direct acting and diaphragm type operations in a Normally Open or Normally Closed version.
可选包括直接作用和隔膜式常开或常闭版本。
Valve types include Normally Open and Normally Closed valves, for use in fuel, hydraulic, or pneumatic applications.
阀门有常开和常闭两种，可用于燃油，液压或气动应用领域。
Valve types include Normally Open and Normally Closed valves, for use in fuel, hydraulic, or pneumatic applications.
阀门有常开和常闭两种，可用于燃油，液压或气动应用领域。
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