| 摘要 |
<p>A fluid control valve used as an expansion valve 1 has valve portions 22 and 23 integrally formed with a valve element 20 which is simultaneously movable relative to valve seats12, 31. Flow passage cross-sections formed by gaps between the valve portion 22 and the valve seat 12, and between the valve portion 23 and the valve seat 31 have approximately the same sizes when the expansion valve is open. The influence of variations of the effective pressure-receiving areas of the valve elements when the expansion valve is open, on the pressure balance, is almost cancelled to prevent degradation of the accuracy of flow rate control dependent on the lift amount of the valve elements.</p> |
