JP6850391B2 - Relay decompression unit - Google Patents

Description

The present invention relates to a RELAY vacuum unit.

In water supply facilities, water stored in distribution reservoirs such as water purification ponds and regulating reservoirs is pumped at a predetermined water pressure by a distribution main buried underground. The water distribution main is arranged so as to supply water to a plurality of water supply areas (for example, Patent Documents 1 and 2).

When the height difference between the distribution reservoir and the water supply area is large, the water pressure in the distribution main may become too high. In such a case, water may be temporarily stored in a water tank, the water pressure may be released, and then water may be distributed again. Such a water tank is called a decompression water tank.

Utility Model Registration No. 3208282 Utility Model Registration No. 3213996 Gazette

However, in the conventional decompression water tank, since water comes into contact with air when the water pressure is released, deterioration of water quality such as a decrease in residual chlorine in the water may occur. In such a case, additional equipment such as an additional chlorine device is required to restore the deteriorated water quality. In addition, when the amount of water to be distributed is large, such as when the water supply area is wide, a large-capacity decompression water tank may be required. In this case, since a large facility space is required to install the decompression water tank, there is a problem that the land is secured and the construction cost is significantly increased.

The present invention was made in view of the above, and an object thereof is to provide a relay decompression unit which can be installed in a space-saving and low cost.

In order to solve the above-mentioned problems and achieve the object, the relay decompression unit according to one aspect of the present invention includes the upstream pipe connected to the upstream side of the water distribution main and the water distribution to the upstream pipe. A downstream pipe connected to the downstream side of the main pipe, a connecting pipe provided substantially horizontally to the ground and connecting the upstream pipe and the downstream pipe, and a connecting pipe provided in the middle of the connecting pipe. It is characterized by including a pressure reducing valve and an air valve provided in the middle of the connecting pipe.

The relay pressure reducing unit according to one aspect of the present invention includes one or more of the pressure reducing valves, the connecting pipe has two or more parallel piping portions connected in parallel, and the pressure reducing valves are connected in parallel. It is characterized in that it is provided in the middle of each of the piping portions and is provided with a flow rate adjusting valve provided so as to sandwich each pressure reducing valve.

The relay pressure reducing unit according to one aspect of the present invention is characterized by including at least a part of the connecting pipe, the pressure reducing valve, and a housing for accommodating the air valve.

The relay decompression unit according to one aspect of the present invention is characterized in that the housing is installed above ground or underground.

The relay decompression unit according to one aspect of the present invention is characterized by including a branch pipe provided in the middle of the connecting pipe and an on-off valve provided in the middle of the branch pipe.

The relay decompression unit according to one aspect of the present invention is characterized by including a stopper valve for connecting the upstream side pipe and the downstream side pipe to the water distribution main, respectively.

The relay pressure reducing unit according to one aspect of the present invention includes one of the pressure reducing valves, and is configured so that another pressure reducing valve can be attached at the time of inspection and replacement of the relay pressure reducing unit. Another pressure reducing valve is characterized in that the total pressure of the water pressure of the distribution main is not applied.

The relay pressure reducing unit according to one aspect of the present invention includes two pressure reducing valves, and when one of the two pressure reducing valves is inspected, the total pressure of the water pressure of the water distribution main is applied to the other of the two pressure reducing valves. The feature is that it does not hang.

The relay pressure reducing unit according to one aspect of the present invention includes one of the pressure reducing valves, has a space to which another pressure reducing valve can be attached when inspecting the pressure reducing valve, and is attached to the pressure reducing valve. Another pressure reducing valve is characterized in that the total pressure of the water pressure of the distribution main is not applied.

According to the present invention, it is possible to realize a relay decompression unit that can be installed in a small space and at low cost.

FIG. 1 is a schematic top view of the relay decompression unit according to the first embodiment of the present invention. FIG. 2 is a schematic configuration diagram of a relay decompression unit according to a second embodiment of the present invention.

Hereinafter, embodiments of the relay decompression unit according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. Further, in each drawing, the same or corresponding elements are appropriately designated by the same reference numerals.

(Embodiment 1)
FIG. 1 is a schematic top view of the relay decompression unit according to the first embodiment of the present invention. The relay decompression unit 100 includes an upstream side pipe 1, a downstream side pipe 2, a connection pipe 3, a pressure reducing valves 4a and 4b, and an air valve 5. The upstream side pipe 1, the downstream side pipe 2, and the connecting pipe 3 are composed of a plurality of pipe materials connected by elbows, flanges, and the like.

The distribution main DP is buried underground and is a pipe for distributing clean water from distribution reservoirs such as water purification ponds and regulating reservoirs. The trunk mains DP, and valves 6a is attached. One end of the branch pipe 7a is connected to the valves 6a. The branch portion of the branch pipe 7a is connected to one end of the upstream pipe 1 via the flexible pipe 8a. Accordingly, the upstream pipe 1 is connected to the upstream side of the water distribution mains DP via valves 6a.

Here, valves 6a may be mounted without suspension of water supply the water flowing through the existing water distribution mains DP, known valves can be provided a branch pipe water distribution mains DP, so without suspension of water supply branching method Can be realized.

Further, on the downstream side of the valves 6a of trunk mains DP are valves 6b is attached. One end of the branch pipe 7b is connected to the valves 6b. The branch portion of the branch pipe 7b is connected to one end of the downstream pipe 2 via the flexible pipe 8b. Accordingly, the downstream side pipe 2 via the valves 6b, is connected downstream of the water distribution mains DP to the upstream side pipe 1. The other end of the branch pipe 7a and the other end of the branch pipe 7b are connected via a butterfly valve 9, which is an example of a flow rate adjusting valve. The branch pipes 7a and 7b are composed of a plurality of pipe materials connected by a flange or the like.

The connection pipe 3 is provided substantially horizontally with respect to the ground and connects the upstream side pipe 1 and the downstream side pipe 2. The connection pipe 3 has two parallel pipe portions 3a and 3b connected in parallel. That is, the connection pipe 3 branches from one end side connected to the upstream side pipe 1 into two parallel pipe parts 3a and 3b, the two parallel pipe parts 3a and 3b merge, and are connected to the downstream side pipe 2. It is configured to reach the other end side.

The pressure reducing valve 4a is provided in the middle of the parallel piping portion 3a. The pressure reducing valve 4b is provided in the middle of the parallel piping portion 3b. Further, two butterfly valves 10a and 10b, which are examples of flow rate adjusting valves provided so as to sandwich the pressure reducing valve 4a, are provided in the middle of the parallel piping portion 3a. Further, two butterfly valves 10c and 10d, which are examples of flow rate adjusting valves provided so as to sandwich the pressure reducing valve 4b, are provided in the middle of the parallel piping portion 3b.

The air valve 5 is provided in the middle of the parallel piping portion 3a in the connecting pipe 3 and on the downstream side pipe 2 side of the butterfly valve 10b. The air valve 5 is a valve for bleeding air in the parallel piping portions 3a and 3b of the connecting pipe 3.

Further, the relay pressure reducing unit 100 includes at least a part of the connecting pipe 3, a pressure reducing valves 4a and 4b, an air valve 5, and a housing 11 that houses the butterfly valves 10a to 10d. Although the housing 11 is provided with an upper lid, FIG. 1 shows a state in which the upper lid is removed in order to explain the internal structure. In the housing 11, the pressure reducing valves 4a and 4b are arranged on the bottom surface of the housing 11 in a state of being supported by the pedestals 12a and 12b, respectively.

Further, the relay decompression unit 100 includes a branch pipe 13 in the middle of the parallel pipe portion 3b in the connection pipe 3. A ball valve 14, which is an example of an on-off valve, is provided in the middle of the branch pipe 13. The tip of the branch pipe 13 is configured so that a hose can be connected as described later, and is configured by, for example, a coupling for a hose. The ball valve 14 is normally closed.

To illustrate the dimensions and characteristics of each of the above structures, water distribution mains DP, the connection pipe 3, valves 6a, 6b, the branch pipes 7a, 7b, flexible tube 8a, 8b is any even diameter 100mm or more, for example, 150mm Is. The butterfly valves 9, 10a to 10c all have a nominal diameter of 100 A or more, for example, 150 A. The air valve 5 has, for example, a nominal diameter of 25 A. The ball valve 14 has, for example, a nominal diameter of 50 A. The pressure reducing valves 4a and 4b can have a pressure reducing ratio of, for example, set to about 10: 1 at the maximum. The pressure reducing valves 4a and 4b can reduce the water pressure from about 1.96 MPa to about 0.2 to 0.3 MPa, for example. It is preferable to provide pressure gauges on the pressure reducing valves 4a and 4b and adjust the pressure reducing valves 4a and 4b so as to obtain a desired water pressure as needed.

Since the relay decompression unit 100 can reduce the water pressure of the water pumped to the water distribution main DP by the pressure reducing valves 4a and 4b and the air valve 5, it can be used as a substitute for the pressure reducing water tank. it can. Further, since the relay decompression unit 100 does not have to bring water into contact with air when releasing the water pressure, deterioration of water quality can be prevented. Further, since the relay decompression unit 100 can reduce the installation space as compared with the decompression water tank, it can be installed in a small space and at a low cost. In particular, since the relay decompression unit 100 is unitized by the housing 11, the installation space can be further reduced.

Further, in the relay decompression unit 100, pressure reducing valves 4a, 4b and connection pipe 3 and the air valve 5 is provided, since the provided substantially horizontally relative to the ground, corresponding to the water distribution mains DP of large diameter Therefore, the pressure reducing valves 4a and 4b, which have been enlarged and increased in weight, can be installed horizontally in a stable state. Further, the pressure reducing valves 4a and 4b are more stably supported by the pedestals 12a and 12b.

Further, in the relay pressure reducing unit 100, since the pressure reducing valves 4a and 4b are provided in the middle of the parallel piping portions 3a and 3b connected in parallel in the connecting pipe 3, the amount of water distributed by the water distribution main DP is large. Also, the two pressure reducing valves 4a and 4b can share the load of the total water pressure and reduce the pressure. As a result, the installation space can be made compact even when the amount of water distributed is large. Further, even when one of the two pressure reducing valves 4a and 4b is inspected, the total pressure is not applied to the other pressure reducing valves. The time of checking the pressure reducing valve is the time of checking whether the pressure reducing valve achieves a desired pressure reduction. Further, the relay pressure reducing unit 100 includes butterfly valves 10a to 10d so as to sandwich the pressure reducing valves 4a and 4b. As a result, when one of the pressure reducing valves 4a and 4b, for example, the pressure reducing valve 4a fails and needs to be replaced, the butterfly valves 10a and 10b are closed to prevent the relay pressure reducing unit 100 from stopping its operation. The exchange of 4a can be carried out. Further, one of the pressure reducing valves 4a and 4b, for example, only the pressure reducing valve 4b may be provided, and a single pipe may be provided at that position without attaching the other pressure reducing valve 4a. Such a single tube provides space for additional pressure reducing valves.

Further, in the event of an emergency disaster, the relay decompression unit 100 can take out the water staying in the distribution main DP from the branch pipe 13 by opening the ball valve 14. By connecting one end of a hose (for example, a fire hose) to the branch pipe 13 and connecting the other end to a water truck or a water faucet stand, water can be supplied to the water truck or the water faucet stand in the event of an emergency disaster. it can. That is, the relay decompression unit 100 can also be used as an emergency water supply unit.

Further, the relay decompression unit 100 can prevent decompression by opening the butterfly valve 9 and closing the butterfly valves 10a to 10d. In this case, the water flowing in the branch pipe 7a through a water distribution mains DP or mules Lube 6a, the branch pipes 7b without vacuum, via the valves 6b returns to the water distribution mains DP.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram of the relay decompression unit according to the second embodiment. This relay decompression unit 100A has the same configuration as the relay decompression unit 100 of the first embodiment, but the upstream side pipe 1 is replaced with the upstream side pipe 1A, the downstream side pipe 2 is replaced with the downstream side pipe (not shown), and The difference is that the housing 11 is arranged on the ground.

The housing 11 having the upper lid 11a is installed on the base portion 15. The foundation portion 15 is buried in the ground Ga, and leveled concrete is cast on the foundation crushed stone.

The upstream side pipe 1A extends into the housing 11 while bending from the flexible pipe 8a, and is connected to the connecting pipe 3. The downstream side pipe (not shown) also extends into the housing 11 while bending from the flexible pipe 8b (not shown in FIG. 2), and is connected to the connecting pipe 3.

The relay decompression unit 100A has the same effect as the relay decompression unit 100 according to the first embodiment, and the housing 11 is arranged on the ground, so that the maintainability is good. However, the present invention is not limited to the mode in which the housing 11 is arranged on the ground, and the housing 11 may be buried underground, for example, with the reference numeral Gb as the ground.

In the above embodiment, the pressure reducing valves 4a and 4b are provided in the middle of the two parallel piping portions 3a and 3b that are piped in parallel in the connecting pipe 3, but the present invention is not limited to this. For example, two pressure reducing valves may be provided in series with one of the two parallel piping sections. In this case, as in the configuration of Patent Document 2, the other parallel piping portion is configured to be a bypass pipe connecting the upstream side of the pressure reducing valve on the upstream side and the upstream side of the pressure reducing valve on the downstream side. Is preferable. Further, the pressure reducing valve on the downstream side is preferably provided at the position of a single pipe in the configuration of Patent Document 2.

Further, for example, in the relay pressure reducing unit 100, when only the pressure reducing valve 4b is provided and a single pipe is provided at that position without attaching the pressure reducing valve 4a, another pipe is used instead of the single pipe when the relay pressure reducing unit 100 is inspected and replaced. A pressure reducing valve may be installed. In this case, since the total pressure of the water pressure of the distribution main DP is not applied to the pressure reducing valve 4b and another pressure reducing valve, the load of the total pressure is shared by the two pressure reducing valves to reduce the load on each pressure reducing valve. can do. The inspection and replacement of the relay decompression unit is a work of checking whether the relay decompression unit achieves a desired decompression or a work of replacing the components of the relay decompression unit.

The present invention is not limited to the above embodiments. The present invention also includes a configuration in which the above-mentioned components are appropriately combined. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above embodiment, and various modifications can be made.

1,1A upstream pipe 2 downstream pipe 3 connecting pipe 3a, 3b parallelepiped portion 4a, 4b reducing valve 5 air valves 6a, 6b valves <br/> 7a, 7b, 13 branch pipes 8a, 8b Allowed Tou tube 9 10a, 10b, 10c, 10d Butterfly valve 11 Housing 11a Top lid 12a, 12b Pedestal 14 Ball valve 15 Base 100, 100A Relay decompression unit DP Water distribution main Ga, Gb Ground

Claims (12)

A relay decompression unit used in water supply facilities.
The upstream piping connected to the upstream side of the main pipe,
A downstream pipe connected to the downstream side of the main pipe with respect to the upstream pipe,
A connection pipe that is provided substantially horizontally to the ground and connects the upstream side pipe and the downstream side pipe,
A pressure reducing valve provided in the middle of the connection pipe and
A relay decompression unit characterized by being equipped with. The relay decompression unit according to claim 1, further comprising an air valve provided in the middle of the connecting pipe. The pressure reducing valve is provided with one or two or more.
The connection pipe has two or more parallel pipe portions connected in parallel.
The pressure reducing valve is provided in the middle of one of the parallel pipe portion,
The relay pressure reducing unit according to claim 1 or 2, further comprising a flow rate adjusting valve provided so as to sandwich each pressure reducing valve. The relay pressure reducing unit according to any one of claims 1 to 3, further comprising at least a part of the connecting pipe and a housing for accommodating the pressure reducing valve. The relay decompression unit according to claim 4, wherein the housing is installed above ground or underground. A branch pipe provided in the middle of the connection pipe and
An on-off valve provided in the middle of the branch pipe and
The relay decompression unit according to any one of claims 1 to 5, wherein the relay decompression unit is provided. The relay decompression unit according to any one of claims 1 to 6, further comprising a stopper valve for connecting the upstream side pipe and the downstream side pipe to the main pipe, respectively. It is equipped with one of the pressure reducing valves.
It is configured so that another pressure reducing valve can be attached when the relay pressure reducing unit is inspected and replaced.
The relay pressure reducing unit according to any one of claims 1 to 7, wherein the total pressure of the main pipe is not applied to the pressure reducing valve and the attached pressure reducing valve. It is equipped with the two pressure reducing valves.
The relay depressurization according to any one of claims 1 to 7, wherein when one of the two pressure reducing valves is inspected, the total pressure of the main pipe is not applied to the other of the two pressure reducing valves. unit. It is equipped with one of the pressure reducing valves.
There is a space where another pressure reducing valve can be attached when inspecting the pressure reducing valve.
The relay pressure reducing unit according to any one of claims 1 to 7, wherein the total pressure of the main pipe is not applied to the pressure reducing valve and the attached pressure reducing valve. The connection pipe has two or more parallel pipe portions connected in parallel.
The relay depressurization according to any one of claims 1 to 7, further comprising another parallel piping portion that connects the upstream side and the downstream side of the pressure reducing valve provided in the middle of a certain parallel piping portion. unit. Claim 1 is characterized in that it includes at least a part of the connecting pipe, a housing for accommodating the pressure reducing valve, and a pedestal for supporting the pressure reducing valve in the housing and disposing the pressure reducing valve on the bottom surface of the housing. The relay decompression unit according to any one of 11 to 11.

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