常闭触头，休止辅助触头；常闭联锁装置 normally closed interlock 常闭阀 normally closed valve 正态分布随机变量 normally distributed random variable ..
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... 正庚烷 normally closed contact 当闭触点 normally closed valve 常开触点 normally open valve ...
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normally closed solenoid valve 常关式电磁阀 ; 常闭电磁阀
normally closed pneumatic diaphragm valve 常闭型气动隔膜阀
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。
Normally Open: When the coil is energized, the pilot hole closed, the valve chamber and pressurized by the piston return spring throttle thrust, the electromagnetic valve is closed.
常开：当线圈通电时，先导孔关闭，阀上腔由活塞节流孔增压和复位弹簧的推力，电磁阀关闭。
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