| 摘要 |
PURPOSE:To obtain constant sealability regardless of wear of a valve body by installing a sealing case onto a pipe passage with a tapered sealing hole and accommodating both a solenoid coil and a cone-shaped valve body nearly concentrically in this sealing case. CONSTITUTION:A pipe passage 1 with a tapered sealing hole 6 is provided with a sealing case 7 in such a manner that the case 7 surrounds the sealing hole 6. Inside this case 7, a solenoid coil 8 and a cone-shaped valve body 9 are accommodated nearly concentrically. The valve body 9 is installed on a spring fixture 13 via a spring 12 so that the valve body 9 can seal the tapered sealing hole 6. When a solenoid coil 8 is excited, both a magnetic path member 15 and a magnetic core 11 are magnetized, and the valve body 9 is pulled to-ward the left in order to seal the flow passage. Thus, wear of a sealing member 10 results merely in increase in the storke of the valve body 9 and not in deterioration of the sealability. |
