US 5,287,876 AGranted

Water piping system

AssigneeKabushiki Kaisha Oze

InventorYoshishige Takahashi

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Abstract

The present invention provides a water piping system wherein when a predetermined time elapses after the flow of the water in a hose has stopped, the water is drawn out of the hose, thereby preventing proliferation of various bacteria in the water standing stagnant in the hose and when the temperature of the water drops, the water is completely drawn out of the hose, thereby preventing a water pipe from rupturing or cracking in the wintertime. The water pipe including a reducing valve which is at a position higher than a waterstop valve is connected with a hose through a first electromagnetic valve. The required number of second electromagnetic valves are located intermediate on the hose. When a predetermined time elapses after the flow of the water through the hose has stopped, the first valve is temporalily closed while the second valves are opened. When a water-temperature sensor incorporated into one of the second valve senses that the temperature of the water has dropped to a predetermined lever, the first valve is closed while the second valves are put open.

Claims2

Dependent claims

Apparatus for preventing stagnation in a fluid distribution system comprising:

fluid flow distribution means having a fluid inlet means and a fluid outlet means;
means for detecting fluid flow rate within the fluid distribution means;
timing means for measuring a predetermined period of time at which said means for detecting fluid flow senses zero flow rate in the distribution system;
means for detecting fluid temperature within the fluid distribution means, said detecting means generating a first signal when a predetermined fluid temperature is detected;
ambient temperature sensing means for generating a second signal when a predetermined ambient temperature is detected;
first valve means for controlling fluid flow at said inlet means, said first valve means being closed in response to said first signal;
second valve means for controlling discharge of said fluid from said fluid distribution means at a point intermediate said inlet means and said outlet means, said second valve means being opened in response to said first signal to discharge said fluid from said fluid distribution system;
heating means for heating said second valve means, said heating means actuated in response to said second signal to heat said second valve means;
and
means for discharging the fluid from said distribution means in response to a signal from said means for detecting said period of zero fluid flow rate.

7 more elements

Dependencies are inferred from the claim text.