| 摘要 |
A valve can varied in operating pressure and stopped in opening and closing by an efficiently movable actuator due to feeding of electric power without malfunction due to disturbance of magnetism, impact or temperature. A variable pressure valve is provided with a shape memory alloy spring. The shape memory alloy spring is raised in temperature and varied in length by a secondary coil that is electromagnetically given power from a primary coil of a control probe. When the shape memory alloy spring varies in length, a feed ratchet performs linear movement to rotate a cam wheel. The cam wheel has a cam with which an urge spring and a rectifying lever at its one end is engaged. The urge spring and rectifying lever at their other ends engage a ball valve to vary an urge force on the ball valve due to rotation of the cam wheel.
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