Water piping system

Abstract: The present invention provides a water piping system wherein when a predetermined time elapses after the flow of the water in a hose (5) 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 (1) including a reducing valve (3) which is at a position higher than a waterstop valve (2) is connected with a hose (5) through a first electromagnetic valve (4). The required number of second electromagnetic valves (7) 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 valves 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.

Description: Field of the Invention The present invention relates to a water piping system. Prior Art City water is more or less sterilized in water disposal installation, but various bacteria tend to proliferate when water stands stagnant. This takes place whether in the summer period or in the wintertime. But especially at constantly high temperatures, like in the summer period, various bacteria proliferate vigorously or, sometimes proliferate even in a very short span of time. Such proliferation is often found in the vicinity of the ends of water hoses, and this is one of the leading causes for bacteria-induced gastroenteric disorder suffered by many people during the summer period in particular. This is particularly true for places closer to or on the equator where daytime temperatures are extremely high. In view of the above problems, this invention seeks to provide a water piping system designed such that when a certain period of time elapses after the flow of the water through 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. U.S. 4 730 637 discloses a water piping system according to the preamble of claim 1. The system comprises a water pipe including a water stop valve, a pipe connected with the water pipe through a first electromagnetic valve and a second electromagnetic valve, the system allowing the first valve to close temporarily while said second valve is held open in order to drain water from the pipe. The system is responsive to temperature whereby, when there is a danger of freezing, the system is drained. However, if there is no danger to freezing then water can remain stagnant in the pipe for an unlimited period. According to the present invention a water piping system comprises a water pipe including a water stop valve, a pipe connected with said water pipe through a first electromagnetic valve and the required number of second electromagnetic valves located intermediate on said pipe, the system allowing said first valve to close temporarily while said second valves are held open in order to drain water from the pipe wherein the system further includes a reducing valve which is at a position higher than the water stop valve, the pipe is a hose and the first valve is closed and the second valves are held open when a predetermined time has elapsed after the flow of water through said hose has stopped in order to prevent proliferation of bacteria in the hose. There may also be provided a water-temperature sensor built in one of said electromagnetic valves 7 for sensing the temperature of the water in said hose 5, whereby when said temperature sensor detects that the temperature of the water in said hose 5 has dropped to a predetermined temperature, said second valves 7 are actuated to draw the water out of said hose 5 while said first valve 4 is actuated to stop water supply, and when said water-temperature sensor detects that the temperature of the water in said hose 5 has risen to a predetermined temperature, said first and second valves 4 and 7 are automatically actuated in the manner reverse to that described above. There may further be provided a temperature sensor on the outside of one of said second valves 7 for sensing the ambient temperature, whereby when said temperature sensor detects that the ambient temperature has dropped to a predetermined temperature, a heater means, in which said electromagnetic valves 7 are enveloped, are actuated, and when the ambient temperature rises, said heater means stop heating. The system may include a water-temperature sensor built in one of said second valves 7 intermediate of said hose 5, whereby when said temperature sensor detects that the temperature of the water in said hose 5 has dropped to a predetermined temperature, said first valve 4 is closed while said second valves 7 are held open. BRIEF DESCRIPTION OF THE DRAWINGS This invention will now be explained specifically but not exclusively with reference to the figure which is an illustrative sketch showing one embodiment of this invention. DETAILED DESCRIPTION OF THE INVENTION When a predetermined time elapses after a sensor device located intermediate on the hose or water pipe, such as a flowmeter, detects that the flow of the water through the hose has stopped, the electromagnetic valve on the water pipe (hereinafter referred to as the first valve) and the electromagnetic valves located intermediate on the hose (the second valves) are simultaneously actuated; that is, the first valve is put off to stop water supply and the second valves are held on to draw the water out of the hose. It is thus possible to prevent proliferation of various bacteria in the water standing stagnant in the hose. Once the water has been let out of the hose, the first and second valves return automatically to the original position. It is noted that this may be manually achieved by operating a separately provided re-start button. When the water is to be drawn out of the hose after the flow of the water through the hose has stopped or how long to let the water out of the hose may be determined in consideration of various factors such as the ambient temperature. Reference will then be made to how the water is drawn out of the hose when the temperature of the water therein has dropped to a predetermined level. As the water-temperature sensor built in one of the second valves located on the horizontally extending portion of the hose detects that the water in the hose has dropped to a predetermined level (about 5°c), the second and first valves are simultaneously actuated; that is, the former valves are held on to draw the water out of the hose and the latter valve is held off to stop water supply. In this way, when the temperature of the water in the hose has dropped to a predetermined level (about 5°c), it is possible to let the water out of the hose completely. Hence, the hose would be very unlikely to rupture or crack by reason of the freezing of the water in the hose. By contrast, as the water-temperature sensor detects that the temperature of the water in the hose has risen to a predetermined level (about 5°c), the second and first valves are actuated in the manner reverse to the foregoing manner. In other words, the second valves are put off to close the water-discharge outlet and the first valve is put on to resume water supply. Furthermore, as a temperature sensors provided on the outside of one of the second valves detects that the ambient temperature has dropped to a predetermined level (about 5°c), heaters having the second valves housed in them for heating are held on for a predetermined time to heat them, whereby they can be prevented from breaking down or being made inoperable by reason of the freezing, etc. of droplets of the water found in the range within which the second valves are at work. As the ambient temperature has risen to a predetermined level (10°c or higher), on the other hand, the heaters adapted to heat the second valves are automatically put off. More preferably, the heaters for heating the second valves should be automatically de-energized upon the ambient temperature reaching a high level of 40°c or higher. As the ambient temperature has dropped to about 5°c or below, the first valve is heated by a heater in which it is housed, thereby preventing its freezing. It is desired that in the course of heating, the first valve be always maintained at some 10°c. Bear in mind that the water in the hose decreases in temperature as it goes farther from the water pipe. This is because the water is constantly flowing through a portion of the hose close to the water pipe, but as it goes farther from there, it is likely to stand stagnant and lie at the lower-limit temperature of 5°c or below. In addition, since the second valves, any one of which has the water-temperature sensors, are located on the hose farther away from the water pipe, the second and first valves are likely to be often put on and off, as already mentioned. Whenever this takes place, the respective valves must be manually operated, but such manual operations are very troublesome. For this reason, the furthermost electromagnetic valve is sometimes actuated for a matter of two seconds to discharge an amount of the water, thereby adjusting the temperature of the water in the furthermost portion of the hose not to drop to some 5°c or lower. Unless the temperature of the water increases to 5°c or higher even by doing this way, all the second valves are then actuated to force the water out of the hose. As the ambient temperature has dropped to about 5°c or below, as mentioned above, the heaters for heating the second valves located intermediate on the hose are put in operation for a predetermined time to heat them. However, it is noted that in the course of being heating, the temperature of the water in the hose is increased correspondingly. This in turn causes the temperature of the water in the hose to be higher or lower than about 5°c. Thus, the first valves are put on and off several times a day, and whenever put on, they allow the water to enter into the hose. To avoid this, the first and second valves should be all designed such that once they have been actuated, i.e., the first and second valves have been held off and on, respectively, such off and on conditions are maintained until the re-start button is pushed to put the first valve on and the second valves off. The electromagnetic valves are being energized while at work, but the continuous operation of them at night incurs some expense; hence, it is desired that they be designed such that once they have been actuated, i.e., the first valve is put off and the second valves are held on, the second valves are de-energized. Keep in mind that the first valve remains energized, thereby making it possible to save the power needed for operating the second valves. Water leakage, which rarely happens according to this water piping system, may possibly ensue hose rupture or failures of some parts, and this would account for water waste. To avoid this, it is desired that the first valve be put off by a timer, flowmeter or other device according to the preset flow time and rate, when pre-determined time comes or predetermined amount of water flow is reached. In order to resume water supply, the re-start button may be pushed to put the first valve on. DESCRIPTION OF THE PREFERRED EMBODIMENT In what follows, one specific embodiment of this invention will be explained with reference to Figure 1. Reference numeral 1 stands for a water pipe which includes a waterstop valve 2. Between the waterstop valve 2 and a hose to be described later, there is provided a reducing valve 3 for the purpose of reducing the pressure of the water to a predetermined level, thereby preventing deterioration of the hose by pressure. Between the reducing valve 3 and the hose 5 there is located a first electromagnetic valve 4, which is opened or closed automatically or manually, when a sensor device to be referred to later, for instance, a flowmeter detects that the flow of the water through the hose has stopped or a water-temperature sensor to be described later detects that the temperature of the water in the hose has dropped to a predetermined level. The hose 5 is made of such soft material as rubber or vinyl, and is connected through a junction 6 with a cock located intermediate thereon. A plurality of second electromagnetic valves 7 are located intermediate on the hose and are positioned on the horizontally extending portion of the hose so as to easily discharge the water out of the hose in total. It is noted that while the number of the second electromagnetic valves 7 is two in the illustrated embodiment, it may be one or more than three. One of the second valves 7, which are actuated simultaneously with the first valve 4, includes therein a water-temperature sensor (not shown). According to this embodiment, the second valves 7 are put on to discharge the water out of the hose when the flow of the water through the hose has stopped or the temperature of the water in the hose has dropped to a predetermined level (about 5°c), below which the water will be frozen, and simultaneously with this, the first valve 4 is put off to stop water supply. Once the water has been drawn completely out of the hose or the temperature of the water has risen (to about 5°c or higher), the first and second valves are automatically actuated in the manner reverse to that described above. In some cases, water supply may be needed even when its temperature has dropped. To cope with this, the first and second valves 4 and 7 are adapted to be actuated manually regardless of the water-temperature sensor. Furthermore, as a temperature sensors (not shown) provided on the outside of one of the second valves 7 detects that the ambient temperature has dropped to a predetermined level (about 5°c), heaters (not shown) having the second valves housed in them are held on for a predetermined time to heat the second valves, whereby they can be prevented by breaking down or being made inoperable by reason of the freezing, etc. of droplets of the water discharged by the second valves 7 or the water in touch therewith. As there is a rise in the ambient temperature, the heaters are also put off automatically. Furthermore, the heaters are put off at an abnormally high temperature of 40°c or higher. The furthermost electromagnetic valve is adapted to be sometimes held on for a matter of two seconds to discharge an amount of the water. Unless the temperature of the water can be increased to 5°c or higher even by doing this, all the second valves are then actuated to remove the water from the hose. The second valves 7 are also designed such that once actuated and held on, they are put off, thereby achieving power saving. Bear in mind that the first valve 4 remains at work. As the ambient temperature drops to about 5°c or lower, a heater 8 on the first valve 4 is actuated to heat it. Water leakage, which rarely happens according to this invention, may possibly be caused by hose rupture or failures of some parts, and this would account for water waste. To avoid this, it is desired that the first valve be put off by a timer, flowmeter or other device according to the preset flow time and rate, when pre-determined times comes or pre-determined amount of water flow is reached. A flowmeter 9 is located intermediate on the hose. In order to resume water supply, a re-start button (not shown) is pushed to put the first valve 4 on. The flowmeter 9 plays an additional role in sensing the flow of the water. When the flowmeter 9 senses that the flow of the water through the hose has stopped, a timer or other device, not shown, is actuated whereby, after the lapse of some time, the second valves 7 are temporalily put on simultaneously with putting the first valve 4 off. When the first and second valves 4 and 7 are automatically opened or closed as mentioned above, for instance, when the first and second valves 4 and 7, once actuated, are held off and on, respectively, there is caused inconvenience. In other words, when the heaters for the second valves 7 are actuated for a predetermine span of time with the second valves 7 being held on, there is a rise in the temperature of the water in the hose while they are being heated, which in turn causes that water to be higher or lower than about 5°c. Thus, the first valve 4 is likely to be put on and off several times a day. To avoid this, the first and second valves 4 and 7 should be all designed such that once they have been actuated, i.e., the first and second valves 4 and 7 have been held off and on, respectively, such off and on conditions are maintained until a re-start button (not shown) is pushed to put the first and second valves 4 and 7 on and off, respectively. In the Figure, reference numeral 10 stands for a house. According to the construction and action of this invention as mentioned above, wherein when a predetermined time elapses after the flow of the water through the hose has stopped, the water is drawn out of the hose, it is possible to prevent proliferation of various bacteria in the water standing stagnant in the hose. At low temperatures of water, as in the wintertime, it is also possible to draw the water out of the hose automatically. Accordingly, such problems as hose rupture or cracking ensuing from the freezing of the water in the hose do not occur at all. Advantages with using rubber or vinyl hose rather than leaden pipes so far used for water pipes are that they are not only inexpensive but easy to lay down as well. In addition, upon the ambient temperature having dropped to a predetermined level, the second electromagnetic valves are so automatically heated that droplets of the water discharged by them or the water in touch with them are unlikely to be frozen, preventing them from being inoperable or breaking down. Further, once the first and second electromagnetic valves have been actuated, the second electromagnetic valves may be de-energized, thereby achieving power saving. Still further, once the first and second valves have been actuated in response to a drop in the temperature of the water, they remain at work until the re-start button is pushed. Thus, it is unlikely that the first electromagnetic valve may be put on and off several times a day. Still further, with the electromagnetic valve positioned on the furthermost location of the hose, it is possible to regulate the system by sometimes opening it for a short span of time so as to increase the temperature of the water in the farthermost portion of the hose. If this is insufficient, then all the second electromagnetic valves might be opened. Thus, it is possible to prevent the first and second valves from being frequently put on and off.

Claims: A water piping system comprising a water pipe (1) including a water stop valve (2), a pipe (5) connected with said water pipe (1) through a first electromagnetic valve (4) and the required number of second electromagnetic valves (7) located intermediate on said pipe, the system allowing said first valve (4) to close temporarily while said second valves (7) are held open in order to drain water from the pipe, characterised in that the system further includes a reducing valve (3) which is at a position higher than the water stop valve (2), the pipe is a hose and that the first valve (4) is closed and the second valves are held open when a predetermined time has elapsed after the flow of water through said hose (5) has stopped in order to prevent proliferation of bacteria in the hose (5). A water piping system according to Claim 1 including a water-temperature sensor built in one of said second valves (7) for sensing the temperature of the water in said hose (5), whereby when said temperature sensor detects that the temperature of the water in said hose (5) has dropped to a predetermined temperature, said second valves (7) are actuated to draw the water out of said hose (5) while said first valve (4) is actuated to stop water supply, and when said water-temperature sensor detects that the temperature of the water in said hose (5) has risen to a predetermined temperature, said first and second valves (4 and 7) are automatically actuated in the manner reverse to that described above. A water piping system according to Claim 2 including a temperature sensor on the outside of one of said second valves (7) for sensing the ambient temperature, whereby when said temperature sensor detects that the ambient temperature has dropped to a predetermined temperature, a heater means, in which said second valves (7) are enveloped, are actuated, and when the ambient temperature rises, said heater means stop heating. A water piping system as claimed in Claim 2 or 3, wherein even when the temperature of the water in said hose does not rise to a predetermined temperature, said first and second valves are actuated manually. A water piping system according to Claim 1 including a water-temperature sensor built in one of said second valves (7) located intermediate on said hose (5), whereby when said sensor detects that the temperature of the water in said hose (5) has dropped to a predetermined temperature, said first valve (4) is closed and said second valves are held open.

Inventors: TAKAHASHI YOSHISHIGE, TAKAHASHI, YOSHISHIGE
Applicants: OZE KK, KABUSHIKI KAISHA OZE
Application year: 1992
Main classification: E03B7
IPC codes: E03B7