JP2011241867A - Valve which can be cleaned and valve cleaning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve which can be cleaned as well as a valve cleaning system, in which disassembling of a valve is not required, for easy cleaning operation inside a valve box and a valve body, with a cleaning method being able to be selected according to the state of a valve.SOLUTION: In a valve 12 includes a valve box 1 and a valve body 2, with the inside of the valve box 1 as well as the valve body 2 being possible to be cleaned, the valve box 1 includes filling ports 3a and 3b for pouring cleaning liquid, and a drain nozzle 4 for discharging the cleaning liquid. A cleaning line 10 for guiding the cleaning liquid into the valve box 1 can be connected to the filling ports 3a and 3b. The drain nozzle 4 is connected to a drain line 9 for discharging the cleaning liquid after cleaning the inside of the valve box 1 and the valve body 2.

Description

  The present invention relates to a valve capable of cleaning the inside of a valve box and a valve body, and a valve cleaning system.

  In general, valves used in power generation facilities have various uses and are used under various conditions. The fluid flowing inside the valve (inside the valve box) includes solids such as chemicals and waste sludge in addition to water, air, and gas. For this reason, many valve types are adopted, and the valve type is selected in consideration of performing control suitable for the flowing fluid. However, depending on the valve structure, solid matter in the fluid may stick to the inside of the valve box or the valve body and remain in the valve box, and it may be difficult to discharge the solid matter from the valve box.

  For example, consider an outlet valve installed at the lower part of a filter of drainage (waste liquid) containing activated carbon in a power generation facility. This valve is an outlet valve installed immediately before a waste discharge unit in a filtration facility for smoothly collecting and processing washing waste liquid and waste liquid generated during hand washing or showering. The filtration cycle of this filtration equipment will be briefly described.

  First, the precoat process of a filter is performed. In other words, water containing activated carbon is circulated in the filter and passed through the filter cloth element (porous filter medium with many fine holes) in the filter, and the activated carbon is pre-coated on the filter cloth surface ( Attach).

  Next, the waste liquid is transferred into a filter and filtered. When the waste liquid passes through the filter cloth pre-coated with activated carbon, solid matter in the waste liquid adheres to the activated carbon and is removed, followed by filtration. When the filter differential pressure reaches the specified differential pressure, the filtration process is terminated and the process proceeds to the next process.

  In the subsequent process, the compressed air is sent from the upper part of the filter, and the drainage that drains the residual liquid in the filter in a state where the solid matter when the waste liquid is filtered is attached to the filter cloth, and the water content of the solid matter Dewatering to reduce the rate.

  Then, the solid substance adhering to the filter cloth is dried with heated air. After that, in order to discharge the dried solid matter, after opening the outlet valve installed at the bottom of the filter, the compressed air is sent into the element from the outlet nozzle and pressurized, the filter cloth is expanded, and the dried solid matter Is peeled from the filter cloth surface. The solid material peeled off from the filter cloth surface passes through the outlet valve and falls and discharges to the drum. When the solid matter discharged to the drum reaches a specified amount, the outlet valve is closed and the drum is transferred to the processing facility.

  Thereafter, the inside of the filter is washed before returning to the precoat process again. Pure water is injected into the filter, and bubbling air is circulated to mainly remove solid matter adhering to the inner surface of the filter. After washing in the filter, the process returns to the precoat process.

  Conventionally, in this outlet valve, the activated carbon and the solid matter adhering to the activated carbon have fallen to the valve inlet side in the course of the above-described process, and a nonconformity event resulting from this solid matter has occurred. Although this solid matter can be removed to some extent by washing in the filter after the filtration treatment, it cannot be completely removed. For this reason, the activated carbon and the solid matter attached to the activated carbon enter the inside of the valve box, and the salt content causes rusting in the inside of the valve box and the valve body. In addition, this solid matter is a cause of malfunction of the valve. For this reason, at present, maintenance such as periodic disassembly and inspection of valves and removal and maintenance of deposits is indispensable.

  Examples of conventional valve cleaning devices include those described in Patent Document 1 and Patent Document 2. In the technique described in Patent Document 1, a detachable spacer is mounted between a valve lid and a valve box, and a cleaning nozzle is provided in the spacer. The spacer is attached by removing the valve lid from the valve box when cleaning the valve. After cleaning is completed, the spacer is removed and the valve lid is assembled back to the valve box. The technique described in Patent Document 2 is a technique related to an air valve, and injects a high-pressure cleaning fluid from a nozzle toward an inner surface of a valve box. The jetted cleaning fluid flows down to the water pipe as it is and is discharged.

JP-A-11-352291 JP-A-5-106751

  In the conventional valve, it is necessary for an operator to periodically disassemble and clean the valve, and there is a desire to reduce the time and cost required for disassembly and the burden on the operator. In particular, in a nuclear power generation facility, in order to reduce the exposure amount of workers, a valve that can be easily cleaned without requiring disassembly is desired.

  In addition, in order to enhance the cleaning effect and finish the cleaning efficiently in a short period of time, there is a demand for a valve that can select a cleaning method in accordance with the state of contamination of the valve (such as the state of solid adhesion). For example, in order to enhance the cleaning effect, it is better to store the cleaning liquid in the valve box for cleaning. Therefore, there is a demand for a valve that can select a cleaning method by storing the cleaning liquid inside the valve box and a cleaning method by flowing water without storing the cleaning liquid.

  Prior art valves have not been able to meet such demands. An object of the present invention is to provide a cleanable valve and a valve cleaning system that do not require disassembly of the valve, facilitate the cleaning operation of the inside of the valve box and the valve body, and select a cleaning method.

  The washable valve according to the invention has the following characteristics.

  The valve box includes a valve box and a valve body, and the valve box includes a water injection port for injecting a cleaning liquid and a drain nozzle for discharging the cleaning liquid. The water injection port can be connected to a cleaning line for guiding the cleaning liquid into the valve box. A drain line for discharging the cleaning liquid after cleaning the inside of the valve box and the valve body is connected to the drain nozzle.

  Furthermore, the washable valve according to the present invention has the following characteristics.

  The water injection port has a stop valve and is connected to a cleaning line for guiding the cleaning liquid to the inside of the valve box. The stop valve opens and closes to open the valve box from the cleaning line. The water injection of the cleaning liquid into the inside of is controlled.

  The valve cleaning system according to the present invention has the following features.

  A valve cleaning system that includes a valve and cleans the inside of the valve box of the valve and the valve body with a cleaning liquid, and includes a control device that controls the valve cleaning system. The valve box includes a water inlet for pouring the cleaning liquid and a drain nozzle for discharging the cleaning liquid. The water injection port has a stop valve and is connected to a cleaning line for guiding the cleaning liquid into the valve box. The drain nozzle has a line closing valve and is connected to a drain line for discharging the cleaning liquid after cleaning the inside of the valve box and the valve body. The control device opens and closes the stop valve to control water injection of the cleaning liquid from the cleaning line into the valve box, opens and closes the line closing valve, and opens the valve box from the inside of the valve box. The discharge of the cleaning liquid to the drain line is controlled.

  In the washable valve and the valve washing system according to the present invention, it is not necessary to disassemble the valve, the washing work of the valve box and the valve body is facilitated, and the washing method can be selected according to the state of the valve. Further, the inside of the valve box and the valve body can be automatically cleaned.

It is a figure which shows the outline | summary of the structure of the valve which can be wash | cleaned. It is a figure which shows the outline | summary of the waste liquid filtration equipment using a valve washing system. It is the flow of the procedure for wash | cleaning the inside of the valve box of a valve, and a valve body. It is the flow of another procedure for cleaning the inside of the valve case of a valve, and a valve element. It is a figure which shows the outline | summary of the waste liquid filtration equipment using the valve cleaning system which performs automatic cleaning.

  The valve and the valve cleaning system according to the present invention are provided with a water inlet and a valve box drain nozzle in a valve box, a cleaning line for introducing cleaning liquid to the water inlet, and a drain drain line connected to the valve box drain nozzle. Thus, the inside of the valve box can be cleaned with the cleaning liquid, and the solid matter deposited in the valve box and the valve body can be discharged. Thereby, the biting into the valve stem and the occurrence of rust, which are the cause of the malfunction, can be suppressed.

  The liquid that has entered the valve box can be led to the drain tank via the discharge drain line and recovered. As a result, it is possible to prevent sheet leakage of liquid that normally passes through.

  In addition, since the frequency of disassembly and inspection for the purpose of removal and maintenance of deposits (solid matter) in the valve is suppressed, when it is used as a valve for nuclear power generation, maintenance costs are reduced, and further, It also has the effect of contributing to exposure reduction.

  In the following description, “solid matter” refers to activated carbon and deposits in the valve mainly composed of solid matter attached to the activated carbon.

  As the cleaning liquid, pure water is mainly used, but a liquid (for example, sodium hydroxide solution) containing a detergent suitable for removing solids can also be used.

  As an exemplary embodiment of a washable valve and a valve washing system according to the present invention, an outlet valve installed in a lower part of a filter of a waste liquid filtration facility in a power generation facility and a washing system for the valve will be described with reference to the drawings.

  FIG. 1 is a diagram showing an outline of the structure of a washable valve (outlet valve) according to this embodiment. The upper figure is a top view showing the outlet valve 12 in a partial cross section, and the lower figure is a side sectional view.

  FIG. 2 is a diagram showing an outline of a waste liquid filtration facility using the valve cleaning system according to the present embodiment. As shown in FIG. 2, the outlet valve 12 is installed in the lower part of the filter 11 of a waste liquid filtration equipment. The explanation about the waste liquid filtration equipment will be described later.

  As shown in FIG. 1, the outlet valve 12 includes a valve box 1, a valve body 2 provided inside the valve box 1, an upper cover plate 7 and a lower cover plate 8 provided so as to sandwich the valve body 2. And a valve stem 5 and a drive device 6. The valve body 2 is sealed by the surface pressure of the upper cover plate 7 and the lower cover plate 8.

  The valve stem 5 is connected to the valve body 2 and can be reciprocated in the horizontal direction (left-right direction in the figure) by the driving device 6 to move the valve body 2. The valve body 2 opens and closes the outlet valve 12 by this operation of the valve stem 5.

  The outlet valve 12 in this embodiment is provided with a valve box drain nozzle 4 in the valve box 1 for the purpose of discharging the solid matter remaining in the valve box 1, and further, a cleaning liquid is injected into the valve box 1. In order to be able to be washed, it is a feature that the water inlets 3a and 3b are installed in the valve box 1. As shown in the lower view (side view) of FIG. 1, the valve box drain nozzle 4 is provided at the lower portion of the outlet valve 12, and the water injection ports 3 a and 3 b are provided at the upper portion and the side surface of the outlet valve 12. The water injection ports 3 a and 3 b may be provided on either the upper part or the side surface of the outlet valve 12.

  A drainage drain line 9 can be connected to the valve box drain nozzle 4, and the cleaning liquid after cleaning (including the removed solid matter) can be easily discharged. The drain drain line 9 can be provided with a line closing valve 19 to control the discharge of the cleaning liquid. If the valve 19 for closing the line is closed during cleaning, the cleaning liquid can be stored in the valve box for cleaning. If the valve 19 is opened, the cleaning liquid is allowed to flow (discharge without storing the cleaning liquid). While) can be washed.

  A cleaning line 10 for pouring a cleaning liquid into the valve box 1 can be connected to the inlets 3a and 3b. The cleaning liquid can be poured from the cleaning line 10 to clean the inside of the valve box 1 and the valve body 2, and the solid matter staying on the wall surface of the valve box 1 and the valve body 2 can be removed. . The inlets 3a and 3b can be closed with a closing plug or the like when the cleaning line 10 is not connected.

  The cleaning line 10 may be permanently installed in the outlet valve 12. That is, the cleaning line 10 may be always connected to the inlets 3a and 3b. In this case, a stop valve 20 is provided in the cleaning line 10, and the injection of the cleaning liquid into the valve box 1 can be controlled by opening and closing the stop valve 20.

  The cleaning line 10 can also supply air bubbling air into the valve box 1.

  The outline of the waste liquid filtration equipment using the valve cleaning system according to the present embodiment will be described with reference to FIG. The waste liquid filtration facility has a filter 11 and an outlet valve 12 installed at the lower part of the filter 11. In FIG. 2, a drainage drain line 9 and a cleaning line 10 are connected to the outlet valve 12 and configured as a valve cleaning system.

  The waste liquid filtration facility shown in FIG. 2 is a facility for pre-coating activated carbon on the filter cloth element 15 in the filter 11 and filtering the waste liquid. Hereinafter, the waste liquid filtration process performed by the waste liquid filtration equipment will be described.

  First, a pre-coating process for pre-coating activated carbon on the element 15 is performed. Water containing activated carbon is put into the filter 11 from the filter inlet 13 and discharged from the filter inlet / outlet 14 through the element 15. This procedure is repeated to continuously circulate water containing activated carbon in the filter 11. In this way, the activated carbon is precoated on the element 15.

  In the filtration process, the waste liquid to be filtered is filled into the filter 11 from the filter inlet 13. When the waste liquid passes through the element 15 pre-coated with activated carbon, the solid matter in the waste liquid adheres to the activated carbon and is removed.

  After completion of the filtration process, compressed air is sent from the upper inlet 16 into the filter 11, and the remaining liquid in the filter 11 is drained from the filter in a state where the solid matter during the filtration process adheres to the filter cloth element 15. Discharge from line 17.

  Further, the filter inlet 13 and the filter inlet / outlet 14 are used to circulate heated air in the filter 11 to dry the solid matter adhering to the filter cloth element 15. After the dried solid matter opens the outlet valve 12 installed at the lower part of the filter 11, compressed air is sent into the element 15 from the filter inlet / outlet 14, and the filter cloth is pressurized and inflated. Peel from the surface.

  The solid material peeled off from the filter cloth surface passes through the outlet valve 12 and falls to a discharge receptacle such as a drum installed at the lower part of the outlet valve 12 and is discharged. When the solid matter discharged to the discharge receptacle reaches a specified amount, the outlet valve 12 is closed and the discharged solid matter is transferred to the processing facility.

  In preparation for the next filtration process, the element 15 is pre-coated with activated carbon, but the inside of the filter 11 is washed before returning to the pre-coating process. A cleaning liquid is injected into the filter 11 from the filter discharge drain line 17, and further, bubbling air is circulated from the filter discharge drain line 17 to clean the filter 11. Thereafter, the process returns to the pre-coating process described above.

  In this series of filtration treatment steps, the outlet valve 12 has a solid matter (mainly solid matter attached to the activated carbon and the activated carbon) during the pre-coating step of the activated carbon and the discharge of the solid matter peeled from the filter cloth surface. The outlet valve 12 may stick to the flow path surfaces of the valve body 2, the upper cover plate 7, and the lower cover plate 8. The stuck solid matter may enter and adhere to the valve box 1 through a gap or the like by the opening / closing operation of the outlet valve 12.

  In the washable valve and the valve washing system according to the present invention, the inside of the valve box 1 and the valve body 2 can be washed, and solid matter attached to the valve box 1 and the valve body 2 can be removed. A method for cleaning the inside of the valve box 1 and the valve body 2 will be described with reference to FIGS. 3 and 4.

  FIG. 3 is a flow of a procedure for cleaning the inside of the valve box 1 of the outlet valve 12 and the valve body 2 and removing solid matter adhered to the valve box 1 and the valve body 2. Although the drainage drain line 9 is connected to the outlet valve 12, the washing line 10 is not connected, and the water injection ports 3a and 3b are closed with a closing plug. When the washing line 10 is not connected to the outlet valve 12, there is an advantage that maintenance of the washing line 10 is unnecessary at the site where the waste liquid filtration facility is installed.

  In S1, the outlet valve 12 is closed.

  In S2, the closing plugs installed in the water injection ports 3a and 3b are removed, and the cleaning line 10 is connected to the water injection ports 3a and 3b.

  In S3, the cleaning liquid guided by the cleaning line 10 is injected into the valve box 1 from the water injection ports 3a and 3b to clean the inside of the valve box 1 and the valve body 2 and adhere to the valve box 1 and the valve body 2 Removed solids. If necessary, by supplying air from the cleaning line 10 into the valve box 1, it is possible to effectively remove solid matter adhering to the inside of the valve box 1 by air bubbling.

  At this time, the line closing valve 19 provided in the drainage drain line 9 may be in a closed state or in an open state. If it is in the closed state, the cleaning liquid can be stored in the valve box 1 for cleaning, and a higher cleaning effect can be expected. In the open state, the cleaning liquid can be washed by flowing water (while discharging the cleaning liquid without accumulating).

  In S4, after cleaning, the line closing valve 19 is opened and the cleaning liquid in the valve box 1 is discharged. However, this processing is not required when the line closing valve 19 is opened in S3 and the cleaning liquid is washed with running water.

  In S5, the washing line 10 is removed from the water injection ports 3a and 3b, and a closing plug is installed in the water injection ports 3a and 3b.

  FIG. 4 is a flowchart of another procedure for cleaning the inside of the valve box 1 of the outlet valve 12 and the valve body 2 and removing the solid matter attached to the valve box 1 or the valve body 2. FIG. 4 shows a procedure when the drainage drain line 9 and the cleaning line 10 are connected to the outlet valve 12. Even when the cleaning line 10 is permanently installed in the outlet valve 12, cleaning is performed according to the procedure shown in FIG. The cleaning line 10 is provided with a stop valve 20 that controls the injection of cleaning liquid into the valve box 1.

  In S11, the outlet valve 12 is closed.

  In S <b> 12, the stop valve 20 provided in the cleaning line 10 is opened, and the cleaning liquid can be poured into the valve box 1.

  In S13, the process similar to S3 shown in FIG. 3 is performed, and the solid substance adhering to the inside of the valve box 1 or the valve body 2 is removed. The line closing valve 19 provided in the drainage drain line 9 may be in a closed state or in an open state.

  In S14, the process similar to S4 shown in FIG. 3 is performed, and the cleaning liquid in the valve box 1 is discharged.

  In S15, the stop valve 20 provided in the cleaning line 10 is closed so that the cleaning liquid cannot be poured into the valve box 1.

  When the washing line 10 is permanently installed in the outlet valve 12, the inside of the valve box 1 and the valve body 2 can be automatically washed. That is, it is possible to perform automatic cleaning periodically for a predetermined period without disassembling the outlet valve 12 and without connecting or removing the piping for cleaning or draining.

  FIG. 5 is a diagram showing an outline of a waste liquid filtration facility using a valve cleaning system that performs automatic cleaning. The waste liquid filtration equipment shown in FIG. 5 has the same configuration as that in FIG. 2, but a control device 18 for controlling the valve cleaning system is provided. The control device 18 controls the opening and closing of the outlet valve 12, the stop valve 20 provided in the cleaning line 10, and the line closing valve 19 provided in the drainage drain line 9. In addition, the cleaning liquid is poured into the valve box 1 or air for bubbling is supplied from the cleaning line 10 into the valve box 1.

  When the control device 18 executes the procedure shown in FIG. 4, the valve cleaning system automatically cleans the inside of the valve box 1 and the valve body 2. Specifically, the control device 18 closes the outlet valve 12 in S11, opens the stop valve 20 provided in the cleaning line 10 in S12, and injects the cleaning liquid into the valve box 1 in S13. In S <b> 13, air bubbling air is supplied from the cleaning line 10 into the valve box 1 as necessary. In S14, after cleaning, the line closing valve 19 provided in the drainage drain line 9 is opened. However, if the line closing valve 19 is open in S13, this processing is not necessary. In S15, the stop valve 20 provided in the washing line 10 is closed.

  DESCRIPTION OF SYMBOLS 1 ... Valve box, 2 ... Valve body, 3a, 3b ... Water injection port, 4 ... Valve box drain nozzle, 5 ... Valve rod, 6 ... Drive device, 7 ... Upper cover plate, 8 ... Lower cover plate, 9 ... Drain drain line DESCRIPTION OF SYMBOLS 10 ... Washing line, 11 ... Filter, 12 ... Outlet valve, 13 ... Filter inlet, 14 ... Filter inlet / outlet, 15 ... Element, 16 ... Upper inlet, 17 ... Filter discharge drain line, 18 ... Control device 19 ... Valve for closing the line, 20 ... Stop valve.

Claims (4)

In a valve comprising a valve box and a valve body, the valve body and the valve body being washable,
The valve box includes a water inlet for pouring the cleaning liquid, and a drain nozzle for discharging the cleaning liquid,
The water injection port can be connected to a cleaning line for guiding the cleaning liquid into the valve box.
A drain line for discharging the cleaning liquid after cleaning the inside of the valve box and the valve body is connected to the drain nozzle.
A washable valve characterized by that. In a valve equipped with a valve box and a valve body, the valve body and the valve body can be cleaned,
The valve box includes a water inlet for pouring the cleaning liquid, and a drain nozzle for discharging the cleaning liquid,
The water inlet has a stop valve and is connected to a cleaning line for guiding the cleaning liquid into the valve box,
A drain line for discharging the cleaning liquid after cleaning the inside of the valve box and the valve body is connected to the drain nozzle,
The stop valve controls the injection of the cleaning liquid from the cleaning line into the valve box by opening and closing.
A washable valve characterized by that. The washable valve according to claim 1 or 2,
The drain line includes a valve for closing the line,
A washable valve capable of washing the inside of the valve box and the valve body in either one of a state in which the line closing valve is opened and a state in which the line closing valve is closed. In a valve cleaning system comprising a valve and cleaning the inside of the valve box of the valve and the valve body with a cleaning liquid,
A control device for controlling the valve cleaning system;
The valve box includes a water inlet for pouring the cleaning liquid, and a drain nozzle for discharging the cleaning liquid,
The water inlet has a stop valve and is connected to a cleaning line for guiding the cleaning liquid into the valve box,
The drain nozzle has a valve for closing the line, and is connected to a drain line for discharging the cleaning liquid after cleaning the inside of the valve box and the valve body,
The control device opens and closes the stop valve to control water injection of the cleaning liquid from the cleaning line into the valve box, opens and closes the line closing valve, and opens the valve box from the inside of the valve box. Controlling the discharge of the cleaning liquid into the drain line;
A washable valve characterized by that.

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