| 摘要 |
PURPOSE:To prevent freezing by performing rising/lowering of a valve through a shape-memory alloy spring and a bias spring in place of bellows to sense the temperature and discharge condensed water. CONSTITUTION:A valve body 16 and a valve shaft 14a are provided in a valve body 12 continuous with a steam conduit 11 while having an integral flow-in port 15 then a shape-memory alloy spring 18 is provided between the lower face of flange section 14b and the upper face of discharge port 13 while a bias spring 19 is mounted between the upper face of flange section 14b and the lower face of the upper section of valve body 16. Upon temperature rise due to steam, the spring pressure of shape-memory alloy spring 18 will exceed over that of bias spring 19 while upon temperature drop due to condensed water, said spring 18 will contract to prevail the spring pressure of bias spring 19. Consequently, it is usefull during cold winter season to eliminate standby valve, inspection, replacement of bellows resulting in cost reduction. |
