JP3215547U - Relay decompression unit - Google Patents

Abstract

Provided is a relay decompression unit that can prevent deterioration of water quality during decompression and that can be installed in a space-saving manner at low cost. A relay decompression unit (100) includes an upstream pipe (1) connected upstream of a water distribution main pipe (DP), a downstream pipe (2) connected downstream from the upstream pipe of the water distribution main pipe, and the upstream A connecting pipe 3 for connecting a side pipe and the downstream pipe, a pressure reducing valve 4a, 4b provided in the middle of the connecting pipe, and an air valve 5 provided in the middle of the connecting pipe. [Selection] Figure 1

Description

  The present invention relates to a relay decompression unit mainly used in waterworks facilities.

  In the water supply system, water stored in a distribution reservoir such as a water purification pond or a regulating pond is pumped by a pump at a predetermined water pressure through a distribution pipe buried underground. The water distribution main is arranged to supply water to a plurality of water supply areas (for example, Patent Documents 1 and 2).

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

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

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

  This invention is made in view of the above, Comprising: It aims at providing the relay pressure reduction unit which can prevent the deterioration of the water quality at the time of pressure reduction, and can be installed in space saving and low cost.

  In order to solve the above-described problems and achieve the object, a relay decompression unit according to an aspect of the present invention includes an upstream pipe connected to an upstream side of a water distribution main pipe, and the water distribution with respect to the upstream pipe. A downstream pipe connected to the downstream side of the main pipe, a connection pipe that is provided substantially horizontally with respect to the ground, and that connects the upstream pipe and the downstream pipe, and is provided in the middle of the connection pipe A pressure reducing valve and an air valve provided in the middle of the connection pipe are provided.

  A relay decompression unit according to an aspect of the present invention includes one or more decompression valves, and the connection pipe includes two or more parallel pipe sections connected in parallel, and the decompression valves are connected in parallel. It is provided in the middle of each piping part, and is provided with the flow regulating valve provided so that each pressure reducing valve may be pinched | interposed.

  A relay decompression unit according to an aspect of the present invention includes a housing that houses at least a part of the connection pipe, the decompression valve, and the air valve.

  The relay decompression unit according to an aspect of the present invention is characterized in that the casing is installed on the ground or underground.

  A relay decompression unit according to an aspect of the present invention includes a branch pipe provided in the middle of the connection pipe and an on-off valve provided in the middle of the branch pipe.

  The relay decompression unit according to an aspect of the present invention includes a stopper valve for connecting the upstream pipe and the downstream pipe to the water distribution main pipe, respectively.

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

  The relay pressure reducing unit according to one aspect of the present invention includes the two pressure reducing valves, and when checking one of the two pressure reducing valves, the other of the two pressure reducing valves has a total water pressure of the water distribution main. It is characterized by not being applied.

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

  According to the present invention, it is possible to prevent the deterioration of water quality during decompression, and to achieve an effect of realizing a relay decompression unit that can be installed in a space-saving and low-cost manner.

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

  Hereinafter, an embodiment of a relay decompression unit according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. Moreover, in each drawing, the same code | symbol is attached | subjected suitably to the same or corresponding element.

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

  The water distribution main DP is buried in the basement and is a pipe for distributing water from a distribution pond such as a water purification pond or a regulating pond. A stopper valve 6a is attached to the water distribution main DP. One end of a branch pipe 7a is connected to the stopper valve 6a. A branch portion of the branch pipe 7a is connected to one end of the upstream pipe 1 via a flexible pipe 8a. Thereby, the upstream side piping 1 is connected to the upstream side of the water distribution main pipe DP through the stopper valve 6a.

  Here, the stopper valve 6a is a well-known valve that can be attached without shutting off the water flowing through the existing distribution main pipe DP, and can be provided with a branch pipe in the distribution main pipe DP. Can be realized.

  A stopper valve 6b is attached to the downstream side of the water distribution main pipe DP from the stopper valve 6a. One end of a branch pipe 7b is connected to the stopper valve 6b. A branch portion of the branch pipe 7b is connected to one end of the downstream pipe 2 via a flexible pipe 8b. Thereby, the downstream side pipe 2 is connected to the downstream side of the water distribution main pipe DP with respect to the upstream side pipe 1 via the stopper valve 6b. 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 pipes connected by a flange or the like.

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

  The pressure reducing valve 4a is provided in the middle of the parallel pipe portion 3a. The pressure reducing valve 4b is provided in the middle of the parallel piping part 3b. In addition, two butterfly valves 10a and 10b, which are examples of a flow rate adjusting valve 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 a flow rate adjusting valve 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 pipe portion 3a in the connection pipe 3 and on the downstream pipe 2 side with respect to the butterfly valve 10b. The air valve 5 is a valve for venting air in the parallel pipe portions 3 a and 3 b of the connection pipe 3.

  The relay decompression unit 100 includes a housing 11 that houses at least a part of the connection pipe 3, the decompression valves 4a and 4b, the air valve 5, and the butterfly valves 10a to 10d. In addition, although the housing | casing 11 is provided with the upper cover, in order to demonstrate an internal structure in FIG. 1, the state which removed the upper cover is shown. Within the housing 11, the pressure reducing valves 4 a and 4 b are disposed on the bottom surface of the housing 11 while being supported by the pedestals 12 a and 12 b, respectively.

  Further, the relay decompression unit 100 includes a branch pipe 13 in the middle of the parallel pipe portion 3 b 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 distal end portion of the branch pipe 13 is configured in a shape to which a hose can be connected as will be described later, and is configured by, for example, a hose coupling. The ball valve 14 is normally closed.

  Exemplifying the dimensions and characteristics of each of the above configurations, the water distribution main pipe DP, the connection pipe 3, the stopper valves 6a and 6b, the branch pipes 7a and 7b, and the flexible pipes 8a and 8b all have a diameter of 100 mm or more, for example, 150 mm It is. The butterfly valves 9, 10a to 10c all have a nominal diameter of 100A or more, for example 150A. The air valve 5 has a nominal diameter of 25A, for example. The ball valve 14 has a nominal diameter of 50A, for example. The pressure reducing valves 4a and 4b can be set to a maximum pressure reducing ratio of about 10: 1, for example. For example, 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. In addition, it is preferable to provide a pressure gauge on the pressure reducing valves 4a and 4b and adjust the pressure reducing valves 4a and 4b so that a desired water pressure is obtained as necessary.

  The relay pressure reducing unit 100 can reduce the water pressure of the water that has been pumped through the water distribution main DP DP by the pressure reducing valves 4a and 4b and the air valve 5. Therefore, the relay pressure reducing unit 100 can be used as an alternative to the pressure reducing water tank. it can. Moreover, since the relay decompression unit 100 does not need to make water contact air when releasing a water pressure, it can prevent deterioration of water quality. Furthermore, the relay decompression unit 100 can be installed in a reduced space and at a low cost because the installation space can be reduced as compared with the decompression water tank. In particular, since the relay decompression unit 100 is unitized by the housing 11, further installation space reduction can be realized.

  Further, in this relay decompression unit 100, the connecting pipe 3 provided with the decompression valves 4a, 4b and the air valve 5 is provided substantially horizontally with respect to the ground, so that the diameter is as large as 100 mm or more. The pressure reducing valves 4a and 4b, which have been increased in size and increased in weight corresponding to the water distribution main pipe DP, can be horizontally installed in a stable state. Further, the pressure reducing valves 4a and 4b are supported more stably by the bases 12a and 12b.

  Further, in this relay decompression unit 100, the decompression valves 4a and 4b are respectively provided in the middle of the parallel pipe portions 3a and 3b connected in parallel in the connection pipe 3, so that the amount of water distribution by the water distribution main DP is large. Also, it is possible to reduce the pressure by sharing the load of the total water pressure by the two pressure reducing valves 4a and 4b. As a result, the installation space can be made compact even when the amount of water distribution is large. Further, even when one of the two pressure reducing valves 4a and 4b is inspected, the other pressure reducing valves are not fully pressurized. In addition, the time of the check of a pressure reducing valve is the time of the operation | work which checks whether the pressure reducing valve has implement | achieved desired pressure reduction. The relay decompression unit 100 includes butterfly valves 10a to 10d so as to sandwich the decompression valves 4a and 4b. Accordingly, when one of the pressure reducing valves 4a and 4b, for example, the pressure reducing valve 4a fails and needs to be replaced, the pressure reducing valve is closed without stopping the operation of the relay pressure reducing unit 100 by closing the butterfly valves 10a and 10b. Exchange of 4a can be carried out. Alternatively, only one of the pressure reducing valves 4a and 4b, for example, 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 where an additional pressure reducing valve can be attached.

  Further, in the event of an emergency disaster, the relay decompression unit 100 can take out the water staying in the water distribution main pipe 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 supply vehicle or a water supply faucet stand, water can be supplied to the water supply vehicle or the water supply faucet stand in 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 be configured not to perform decompression by opening the butterfly valve 9 and closing the butterfly valves 10a to 10d. In this case, the water flowing from the water distribution main pipe DP to the branch pipe 7a via the stopper valve 6a returns to the water distribution main pipe DP via the branch pipe 7b and the stopper valve 6b without decompression.

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

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

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

  The relay decompression unit 100A has the same effects as the relay decompression unit 100 according to the first embodiment, and has good maintainability because the housing 11 is disposed on the ground. However, the present invention is not limited to a mode in which the housing 11 is disposed on the ground, and the housing 11 may be buried underground, for example, with the code Gb as the ground.

  In addition, in the said embodiment, although the pressure-reduction valves 4a and 4b are provided in the middle of each of the two parallel piping parts 3a and 3b piped in parallel in the connection piping 3, this invention is not limited to this. For example, two pressure reducing valves may be provided in series in one of the two parallel pipe sections. In this case, as in the configuration of Patent Document 2, the other parallel pipe section is configured to be a bypass pipe that connects the upstream side of the upstream pressure reducing valve and the upstream side of the downstream pressure reducing valve. Is preferred. Further, the downstream pressure reducing valve is preferably provided at the position of the 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, when the relay pressure reducing unit 100 is inspected and replaced, another pipe is used instead. A pressure reducing valve may be attached. In this case, the total pressure of the distribution main pipe DP is not applied to the pressure reducing valve 4b and another pressure reducing valve, so the load of the total pressure is shared by the two pressure reducing valves to reduce the burden on each pressure reducing valve. can do. Note that the time when the relay pressure reducing unit is inspected and replaced refers to the time when the relay pressure reducing unit is inspected to achieve a desired pressure reduction or the time when the components of the relay pressure reducing unit are replaced.

  The present invention is not limited to the above embodiment. What was comprised combining suitably each component mentioned above is also contained in this invention. Further effects and modifications can be easily derived by those skilled in the art. Therefore, a wider aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

DESCRIPTION OF SYMBOLS 1, 1A Upstream piping 2 Downstream piping 3 Connection piping 3a, 3b Parallel piping parts 4a, 4b Pressure reducing valve 5 Air valve 6a, 6b Stopper valve 7a, 7b, 13 Branch pipe 8a, 8b Flexible pipe 9, 10a, 10b 10c, 10d Butterfly valve 11 Housing 11a Upper lid 12a, 12b Pedestal 14 Ball valve 15 Base part 100, 100A Relay decompression unit DP Water distribution mains Ga, Gb Ground

Claims (9)

An upstream pipe connected to the upstream side of the water main,
A downstream pipe connected to the downstream side of the water distribution main pipe with respect to the upstream pipe;
A connection pipe that is provided substantially horizontally with respect to the ground, and connects the upstream pipe and the downstream pipe;
A pressure reducing valve provided in the middle of the connecting pipe;
An air valve provided in the middle of the connection pipe;
A relay decompression unit comprising: Including one or more pressure reducing valves,
The connection pipe has two or more parallel pipe parts connected in parallel,
The pressure reducing valve is provided in the middle of each parallel piping part,
The relay pressure reducing unit according to claim 1, further comprising a flow rate adjusting valve provided so as to sandwich each pressure reducing valve.   The relay decompression unit according to claim 1, further comprising a housing that houses at least a part of the connection pipe, the decompression valve, and the air valve.   The relay decompression unit according to claim 3, wherein the casing is installed on the ground or underground. A branch pipe provided in the middle of the connection pipe;
An on-off valve provided in the middle of the branch pipe;
The relay decompression unit according to any one of claims 1 to 4, further comprising:   The relay decompression unit according to any one of claims 1 to 5, further comprising a stopper valve for connecting the upstream pipe and the downstream pipe to the water distribution main pipe. One pressure reducing valve,
It is configured so that another pressure reducing valve can be attached at the time of inspection and replacement of the relay pressure reducing unit.
The relay pressure reducing unit according to any one of claims 1 to 6, wherein the pressure reducing valve and the attached another pressure reducing valve are not subjected to the total water pressure of the water distribution main. Two pressure reducing valves,
The relay according to any one of claims 1 to 6, wherein when one of the two pressure reducing valves is inspected, the other of the two pressure reducing valves is not subjected to the total water pressure of the water distribution main. Decompression unit. One pressure reducing valve,
It has a space where another pressure reducing valve can be attached when checking the pressure reducing valve,
The relay pressure reducing unit according to any one of claims 1 to 6, wherein the pressure reducing valve and the attached another pressure reducing valve are not subjected to the total water pressure of the water distribution main.

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