| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent production of septic water in by-pass piping in a liquid supplying device furnished with the by-pass piping in which a check valve exists. SOLUTION: A branch pipe 8 is provided from a by-pass pipe 7 on the discharge side of the downstream side of a by-pass check valve 5, a solenoid valve 10 is installed on the piping 8, a branch pipe 9 of the solenoid valve 10 is connected to a by-pass pipe 6 on the intake side of the upstream of the by-pass check valve 5, and the solenoid valve 10 is opened and closed by a signal of a signal conductor 12 from a control panel 11 in a liquid supplying device to receive liquid from a water supplying pipe branched from a water distributing pipe, furnished with the by-pass pipings 6, 7 of a pump in which the check valve 5 exists and to supply liquid to a customer by the pump.</p> |
