| 摘要 |
<p>PURPOSE:To carry out the water filling operation for priming simply and securely and also piping work easily by a method that at the one end of the second and third flow passages formed laterally and branched from the first flow passage formed downward and connected to a pump, the water filling devices for priming are equipped and the second and third flow passages are formed in a down grade from respective connecting holes toward the upper end of the first flow passage. CONSTITUTION:A tube fitting 25 is equipped with the first flow passage 251 formed downward, the second flow passage 252 and the third flow passage 253 which are branched off in an L-letter-shape and laterally from the upper part of the passage 251 and the passages 252 and 253 are formed in a down grade toward the passage 251 from the connecting holes 25B, 25C. To the hole 25C, a water filling device 33 for priming with an upward water filling hole 33 is connected and when the priming water is necessary, a water plug 34 is removed by a coin, etc., and then water is only filled from a water filling hole 33A. The filled water flows smoothly from the passage 253 to the passage 251 and drops into a circulation pump 10 through a pipe 24. To the connecting holes 25C, 28C of the tube fitting 25, 28 outside pipes 29, 30 can be connected.</p> |
