| 摘要 |
A time-delay solenoid includes a cylindrical permanent magnet and a coil wound cylindrical bobbin mounted within a single housing and adapted to exert opposite forces on a plunger. The plunger having a ball check valve connected to one end thereof is slidably secured for movement inside a tube within the solenoid. The valve acts to impede movement of the plunger in one direction through a viscous fluid in the tube.
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