| 摘要 |
PURPOSE:To control the pressure difference in a fluid passage at the time of nonelectrification by incorporating a check valve which opens by the difference in the pressures above and below the valve at the time of nonelectrification in a solenoid valve for closing the fluid passage by the energizing force of a spring at the time of nonelectrification. CONSTITUTION:When a coil 4 is electrified, a magnetic path is formed by a plunger 12, a stator 2, a cover 1, and an auxiliary magnetic pole 7. Then, the plunger 12 is attracted to the stator 2 against the energizing force of a first spring 13. Thus, a retainer 14 is moved downwards, and a valve body 16 is detached from a seat part 10 to open a fluid passage 9. On the other hand, when the electrification to the coil 4 is stopped, the plunger 12 is moved upwards by the energizing force of the first spring 13 to return to a closed valve condition. In this case, if a pressure difference is caused between the upper part and the lower part of the fluid passage 9, the pressure on the port B side becomes higher than that on the port A side. And, when the pressure difference exceeds the energizing force of a second spring 17, the valve body 16 is opened to control the pressure in the fluid passage 9. |
