JPH06193799A - Piping system equipped with valve - Google Patents

Abstract

PURPOSE:To form a piping system equipped with a valve which can carry out maintenance for adjusting valves, etc., obviating the necessity of checking the flow in a main pipe, to the compact constitution having a small number of parts and necessary space, at a low cost, and facilitate operation and reduce faulty operation. CONSTITUTION:A four-way valve 12 is arranged midway in a main pipe 11 in which fluid flows. A loop-shaped auxiliary pipe 13 is connected with the four-way valve 12. Accordingly, the first system 11 for the return to the main pipe 11 through the four-way valve 12 after the passing through an auxiliary pipe 13 through the four-way valve 12 from the main pipe 11 and the second system which passes only through the main pipe 11 passing through the four-way valve 12 and forms the auxiliary pipe 13 in a closed loop is constituted. An adjusting valve 15 and other maintenance-requiring equipment are installed in the auxiliary pipe 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve-equipped pipe system applied to, for example, a drain pipe with a regulating valve in a power plant, and particularly with a valve capable of performing maintenance of the regulating valve without having to stop the flow of the main pipe. Regarding the piping system.

[0002]

2. Description of the Related Art As is well known in the prior art, flow control valves and traps are installed in drain pipes of power plants. These adjustment valves, traps, etc. need to be inspected / repaired depending on the period of use, etc., but in order to prevent a decrease in plant operation efficiency, they should be operated without stopping the drain distribution during the inspection / repair period. It is desired to continue.

FIG. 5 shows a conventional valve-equipped piping system constructed to meet such a demand.

In the main pipe 1 through which fluid such as drain flows, an inlet valve 2, a strainer 3 and a flow rate adjusting valve 4 are sequentially arranged from the upstream side.
And an outlet valve 5 is provided.

A bypass pipe 6 that bypasses the inlet valve 2 and the outlet valve 5 is connected to the main pipe 1 through T joints 7 and 8, and a bypass valve 9 is provided in the bypass pipe 6.

During normal operation, the bypass valve 9 is closed, and the fluid flows as shown by the arrow a in FIG.
It is distributed to the main pipe 1.

Further, at the time of maintenance of the adjusting valve 4 and the like, as shown in FIG. 6, the inlet valve 2 and the outlet valve 5 are closed and the bypass valve 9 is switched to the open state, and the fluid is indicated by an arrow b in FIG. As indicated by, the flow is through the bypass pipe 6, and the flow to the regulating valve 4 is stopped.

As a result, the plant operation can be continued without stopping the drain flow even during the inspection and repair of the adjusting valve 4.

[0009]

However, according to the configuration of the conventional piping system with a valve described above, the inlet valve 2 and the outlet valve 5 are provided.
Since many devices such as the bypass valve 9 and the bypass pipe 6 are required, the configuration is complicated, the number of installation steps and manpower are large, and the facility cost is high.

Further, many valve operations are required in the flow path switching operation, which may cause an erroneous operation.

Further, since the bypass pipe 6 is provided, a large space for installing the pipe is required.

The present invention has been made in view of the above circumstances, and has a compact construction with a small number of parts and a required space for a valve-equipped piping system capable of performing maintenance such as a regulating valve without stopping the flow of the main piping. As an object of the present invention, it is an object of the present invention to provide a device that is low in cost, easy to operate, and less likely to cause an erroneous operation.

[0013]

In order to achieve the above object, the present invention installs a four-way valve in the middle of a main pipe through which a fluid flows, and connects a loop-shaped auxiliary pipe to the four-way valve. Thus, a first system that returns from the main pipe to the main pipe through the four-way valve and then to the auxiliary pipe and then returns to the main pipe through the four-way valve, and only the main pipe that passes through the four-way valve and the auxiliary pipe is a closed loop. 2 system, and the auxiliary pipe is provided with a regulating valve and other maintenance-requiring devices.

[0014]

According to the present invention having such a structure, one four-way valve can provide the functions of three conventional inlet valves, outlet valves, and bypass valves, and bypass piping is unnecessary. Therefore, the configuration is simple, the number of installed devices is reduced, the number of installation steps and manpower can be reduced, and the facility cost can be reduced.

Further, since it is possible to switch between the normal operation and the continuous operation at the time of maintenance by operating only one four-way valve, the valve operation at the time of operation is reduced, the easiness of the operation is secured, and the erroneous operation is prevented. Can be effectively achieved.

Furthermore, since there is no need for bypass piping,
Space can be saved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

This embodiment relates to the drain piping system of a power plant, FIG. 1 is an overall system diagram showing the state during normal operation, FIG. 2 is a schematic diagram showing the valve configuration in the same state, and FIG. 3 is FIG. 4 is an overall system diagram showing a state during maintenance, and FIG. 4 is a schematic diagram showing a valve configuration in the same state.

In this embodiment, as shown in FIG. 1, a four-way valve 12 is installed in the middle of the main pipe 11 through which the drain flows. A loop-shaped auxiliary pipe 13 is connected to the four-way valve 12, and a strainer 14 and a flow rate adjusting valve 15 that is a device requiring maintenance are installed in the auxiliary pipe 13.

As shown in FIG. 2, the four-way valve 12 has, for example, a cock construction and has two valve holes 14a and 14b, which are connected to the main pipe 11 and the auxiliary pipe 13. In this embodiment, as the first system, the drain is the main pipe 1 as shown by the arrow c in FIGS. 1 and 2.
1 (inlet piping 11a) to the first valve hole 14 of the four-way valve 12
After passing through the auxiliary pipe 13 via a, the second of the four-way valve 12
A system for returning to the main pipe 11 (outlet pipe 11b) via the valve hole 14b of the above is constructed.

As a second system, FIG. 3 and FIG.
As indicated by an arrow d, the drain passes from the inlet pipe 11a to the outlet pipe 11b through the first valve hole 14a of the four-way valve 12, and the auxiliary pipe 13 is provided by the second valve hole 14b of the four-way valve 12. A closed loop system is constructed.

However, during normal plant operation, the four-way valve 12 is used in the first system state shown in FIGS. 1 and 2. As a result, the drain flows from the inlet pipe 11a through the first valve hole 14a of the four-way valve 12 to the flow rate adjusting valve 15 of the auxiliary pipe 13, and after the flow rate is adjusted here, the drain of the second valve of the four-way valve 12 is adjusted. It is discharged from the outlet pipe 11b through the hole 14b.

On the other hand, at the time of maintenance of the flow rate adjusting valve 15, the four-way valve 12 is switched and used in the second system state shown in FIGS. 3 and 4. As a result, even during the maintenance period of the flow rate adjusting valve 4, the drain can be circulated as in the normal operation, and thus the plant operation can be continued without stopping the drain distribution.

Therefore, according to the present embodiment described above, one four-way valve 12 can obtain the functions of the three conventional inlet valves, outlet valves and bypass valves, and no bypass piping is required. , The configuration is simple and the number of installed devices is small,
The number of installation steps and manpower can be reduced, and the facility cost can be reduced.

Further, since it is possible to switch between the normal operation and the operation at the time of maintenance by operating only one four-way valve 12, the valve operation at the time of operation is reduced, the easiness of the operation is ensured, and the erroneous operation is prevented. The prevention can be effectively achieved. Furthermore, since no bypass piping is required, space can be saved.

Although the present invention is applied to the drain piping system of the power plant in the above embodiments, the present invention is not limited to this and can be applied to various other piping systems.

In the above embodiment, the four-way valve 12 has a cock type construction, but it goes without saying that other types may be adopted.

Further, in the above-mentioned embodiment, the flow rate adjusting valve 15 is installed as a maintenance-requiring device, but a pressure adjusting valve or other valves, a trap or the like may be installed as appropriate.

[0029]

As described in detail above, according to the present invention, one four-way valve can achieve the functions of three inlet valves, outlet valves and bypass valves of the prior art, and no bypass piping is required. Therefore, the configuration is simple, the number of installed devices is small, the number of installation steps and manpower can be reduced, and the facility cost can be reduced. Also,
Since it is possible to switch between normal operation and continuous operation at the time of maintenance by operating only one four-way valve, the number of valve operations during operation can be reduced, easiness of operation can be ensured, and erroneous operation can be effectively prevented. Like further,
Since there is no need for bypass piping, many practical effects such as space saving can be achieved.

[Brief description of drawings]

FIG. 1 is an overall system diagram showing a state during normal operation of a valved piping system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a valve configuration in the state of FIG.

FIG. 3 is an overall system diagram showing a state during maintenance in the embodiment.

FIG. 4 is a schematic diagram showing a valve configuration in the state of FIG.

FIG. 5 is a system diagram showing a state of a conventional valved piping system during normal operation.

FIG. 6 is a system diagram showing a state during maintenance in a conventional example.

[Explanation of symbols]

 11 Main piping 12 Four-way valve 13 Auxiliary piping 15 Regulator valve

Claims (1)

[Claims] 1. A four-way valve is installed in the middle of a main pipe through which a fluid flows, and a loop-shaped auxiliary pipe is connected to the four-way valve, whereby after passing through the auxiliary pipe from the main pipe through the four-way valve. A first system that returns to the main pipe via a four-way valve and a second system that passes only the main pipe passing through the four-way valve and the auxiliary pipe is a closed loop are configured, and the auxiliary pipe includes a regulating valve and other components. A piping system with a valve that is equipped with maintenance-requiring equipment.