| 摘要 |
<p>PURPOSE: To eliminate the trouble in the lining installation generated in an expanded diameter part and reduced diameter part by providing a liquid flow controller with a limiter mechanism which outputs a stop signal to stop the supply of liquid flow by receiving the detection signal of the pressure of the liquid flow injected into a pipe when this pressure changes to the upper limit or above or lower limit or below of a set range. CONSTITUTION: After a leveling off pig 3 is introduced into a supply pipe 7, a resin is injected from an above-the-ground aperture 14 into the supply pipe 7 by a liquid pressure obtd. by a liquid feed pump 10. A resin transporting pig 4, a liquid absorbent 5 and a liquid shutting off pig 6 are thereafter introduced into the supply pipe 7 under the same liquid pressure. Next, the liquid B is injected via the fluid flow controller 20 into the supply pipe 7 by a liquid feed pump 10, by which the resin A is transferred to a branching position 2. At this time, the pressure in the supply pipe 7 changes suddenly when the expanded diameter part or the reduced diameter part exists in mid-way of the supply pipe 7. A fluctuation in the pressure is detected by a pressure gage of the fluid flow controller 20 and the supply of the fluid flow by the liquid feed pump 10 is stopped when the fluctuation of the pressure attains the upper limit or above or the lower limit or below of the set range.</p> |
