| 摘要 |
<p>Disclosed is a proportional control valve which comprises an outer face and an inner face, and has a ring shape formed with a hollowed center. The inner face includes: a first column formed with a flow passage 1_1 (f11), and a flow passage 1_2 (f22); and a second column which is detachably inserted to the hollowed center of the first column which has a first depressed portion. In accordance with the rotation of the second column, the first depressed portion functions as a flow passage where the fluid can be transferred between the flow passage 1_1 (f11) and the flow passage 1_2 (f22).</p> |
