JPH07190206A - Sluice valve - Google Patents

Abstract

PURPOSE:To provide a sluice valve so constituted that its valve body is taken out to the outside even in such a condition that fluid pressure is applied thereupon so as to perform maintenance therefor. CONSTITUTION:A lower chamber 11 to retain the completely closed seating condition of a valve body 3, an intermediate chamber 12 provided with a cutoff plate 13 contiguously arranged to the lower chamber 11, and an upper chamber 14 to retain the completely opened suspension condition of the valve body 3 contiguously arranged to the intermediate chamber 12 are provided in a sluice valve 1 to cut off flowing water so that the cutoff plate 13 of the intermediate chamber 12 is fully closed in such a condition that the valve body 3 is positioned in the upper chamber 14 so as to release the upper chamber 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sluice valve, and more particularly to a sluice valve capable of repairing a valve body under a fluid pressure.

[0002]

2. Description of the Related Art Conventionally, a sluice valve has been widely used to open and close a flow path. For example, when a sluice valve is installed on the suction side of the pump, the sluice valve 1 is installed in the water tank 3 as shown in FIG.
0 is installed in the suction pipe 32 that connects the suction side of the pump 31. As shown in FIGS. 6 and 7, the sluice valve 1 has a valve body 3 disposed in a valve box 2 so as to be able to move up and down, and a valve rod 4 connected to a drive device is fixed to the valve body 3. Has been done.

On both sides of the valve body 3, valve seats 5, 5 are provided.
The valve body 2 is provided with valve body seats 6 and 6 facing the valve body seats 5 and 5. The upper opening of the valve box 2 is closed by a lid 7.

[0004]

As shown in FIGS. 5 to 7, a conventional sluice valve of this type has no maintenance valve before and after the sluice valve, is installed at the inlet of the pump, and has a suction water surface. Since it is often installed below, it was not easy to perform maintenance. For example, in order to lower the suction water surface, aiming at night (midnight) when the inflow is small, suck water from the water tank with another pump, or dive into the suction water tank to put a blocking plate at the suction inlet. Met.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a sluice valve configured so that a valve body can be taken out and maintained even when a fluid pressure is applied.

[0006]

In order to achieve the above-mentioned object, in a sluice valve of the present invention, a sluice valve for shutting off running water is provided with a lower chamber for holding a fully closed seated state of a valve body and an adjoining lower chamber. And an upper chamber that is installed adjacent to the intermediate chamber and that holds the valve body in a fully opened and suspended state, and the valve body is located in the upper chamber Then, the shut-off plate of the intermediate chamber is fully closed, and the upper chamber can be opened.

[0007]

According to the present invention having the above-mentioned structure, the upper chamber is isolated from the intermediate chamber by fully closing the shut-off plate of the intermediate chamber with the valve element being pulled up and positioned in the upper chamber. Can be openable. Therefore, the upper chamber can be opened and the valve body seat provided on the valve body can be inspected and replaced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a sluice valve according to the present invention is shown in FIG.
The description will be made with reference to FIG. FIG. 1 is a sectional view of the sluice valve, and FIG. 2 is a view on arrow II of FIG. In FIG. 1 and FIG. 2, reference numeral 1 is a sluice valve, and the sluice valve 1 is provided with a valve box 2, a lower chamber 11 is defined in the valve box 2, and a valve body 3 is provided in the lower chamber 11. Are arranged. An intermediate casing 8 is provided above the valve box 2, and an intermediate chamber 12 is defined in the intermediate casing 8.
A blocking plate 13 is installed in the opening 2 so that it can be opened and closed.

An upper casing 9 is provided above the intermediate casing 8, and an upper chamber 14 is defined in the upper casing 9. The valve rod 4 holding the valve body 3 penetrates the intermediate chamber 12 and the upper chamber 14 and extends upward.

Flexible valve body seats 5 and 5 are detachably provided on both sides of the valve body 3, and the valve body seat 5 and 5 are disposed in the valve box 2 so as to face the valve body seats 5 and 5. 6, 6 are provided. Similarly, a soft blocking plate sheet 15 is detachably provided on the blocking plate 13. A body-side metallic sheet 16 that is in close contact with the blocking plate sheet 15 is fixed to the intermediate casing 8.

Further, cleaning nozzles 17, 17 which are opened to the lower body of the lower chamber 11 are provided, and the cleaning nozzle 1
7 and 17 are connected to the pressurized fresh water through a pipe 19 having washing valves 18 and 18. Opening 1 in upper chamber 14
4a is formed, and the opening 14a has a water supply valve 2
It is connected to the pressure fresh water via a pipe 19 having zero.

Next, the operation of the sluice valve constructed as described above will be described. When the valve body 3 is located in the lower chamber 11 and is in the fully closed seated state, the valve body seat 5 is in close contact with the valve body seat 6. Lift the valve body 3 and position it in the upper chamber 14,
The shaft 21 and the handle 22 that penetrate the outside (see FIG. 2)
The shutoff plate 13 is closed by operating. Thereby, the intermediate chamber 12 and the upper chamber 14 are shielded. Next, the internal pressure of the upper chamber 14 is lowered, and the drain hole 23 of the upper chamber 14 is drained.
When the upper chamber 14 is opened (see FIG. 2) to drain the water in the upper chamber 14, the upper chamber 14 can be opened for inspection. At this time, the blocking plate 13 is pushed upward with a large force by the fluid pressure of the lower chamber 11 and comes into close contact with the intermediate casing 8, so that the pressure of the main pipe is not transmitted to the upper chamber 14.

When the inspection lids 24 and 25 provided on both sides of the upper chamber 14 are opened after the atmospheric pressure is reached, the valve seat 5 inside is opened.
Can be easily inspected and replaced in a short time. The valve body sheet 5 is softer than the valve body sheet 6 and is easy to replace. After repairing the valve body sheet 5,
Next, the cleaning valve 18 provided on the valve body side is opened, and dirt, dust, etc. on the surface of the valve body seat 6 or around the valve body seat 6 are washed with fresh water pressure jet water. After that, the inspection lids 24 and 25 are closed,
The water injection valve 20 is opened to fill the upper chamber 14 with water.

When the pressures in the upper chamber 14 and the lower chamber 11 become almost the same, the shut-off plate 13 is returned to the original open position and the valve body 3 is lowered, so that the valve body 3 can be fully seated. The intermediate casing 8 is also provided with an inspection lid 26. When the valve body 3 is in the fully closed seated state, the inspection lid 26 is opened, and the seat 15 of the shutoff plate 13 is inspected and replaced. The water-stopping property is maintained.

FIGS. 3 and 4 are views showing another embodiment of the present invention, FIG. 3 is a longitudinal sectional view, and FIG. 4 is a view on arrow IV of FIG. This embodiment is an example in which the flange A surface (see FIG. 6) of the conventional gate valve shown in FIGS. 6 and 7 is divided and a valve chamber 40 with a shutoff plate 13 which is a separate member is inserted therebetween.
This valve chamber 40 is the intermediate casing 8 shown in FIGS.
It has the same function as that of the intermediate chamber 12 in the valve chamber 40.
And an upper chamber 14 is defined above the blocking plate 13.

Therefore, the intermediate chamber 12 and the upper chamber 14 can be separated by closing the blocking plate 13.
According to this embodiment, the same operation and effect as those of the embodiment shown in FIGS. 1 and 2 can be achieved only by remaking the valve rod 4 of the existing sluice valve. After the valve body 3 is pulled up and the shutoff plate 13 is closed, the flange B surface is cut off so that the valve body 3 can be taken out without the inspection lids 24 and 25 as shown in FIGS. 1 and 2. It is possible.

[0017]

As described above, according to the present invention, the upper chamber is isolated from the intermediate chamber by fully closing the shutoff plate of the intermediate chamber with the valve element being pulled up and positioned in the upper chamber.
The upper chamber can be opened, and the valve body seat provided on the valve body can be inspected and replaced.

Therefore, the valve body can be inspected and repaired even when the fluid pressure is applied, and the valve body can be taken out without performing the excessive work of lowering the water level or the tense work for a short time, and the repair is easy. Has the effect of becoming. At the same time, the sluice valve operates normally during this inspection / repair work, so that the water shutoff is increased, and the effect of facilitating maintenance / inspection and repair of other pumps and auxiliary equipment can be expected.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a sluice valve according to the present invention.

FIG. 2 is a view on arrow II in FIG.

FIG. 3 is a vertical sectional view showing another embodiment of the sluice valve according to the present invention.

FIG. 4 is a view on arrow IV in FIG.

FIG. 5 is an explanatory diagram illustrating a usage state of a conventional gate valve.

FIG. 6 is a vertical cross-sectional view of a conventional gate valve.

FIG. 7 is a view on arrow VII of FIG.

[Explanation of symbols]

 1 Gate Valve 2 Valve Box 3 Valve Body 4 Valve Bar 5 Valve Body Seat 6 Valve Body Seat 7 Lid 8 Intermediate Casing 9 Upper Casing 11 Lower Chamber 12 Intermediate Chamber 13 Blocking Plate 14 Upper Chamber 15 Blocking Plate Sheet 17 Cleaning Nozzle 18 Cleaning Valve 20 Water injection valve 21 Shaft 22 Handle 24, 25, 26 Inspection lid

Claims (3)

[Claims] 1. A sluice valve for shutting off running water, a lower chamber for holding a fully closed seated state of a valve body, an intermediate chamber provided adjacent to the lower chamber and having a shutoff plate, and adjacent to the intermediate chamber. And an upper chamber that holds the valve body in a fully opened and suspended state, and the valve body is positioned in the upper chamber, the shutoff plate of the intermediate chamber can be fully closed to open the upper chamber. A sluice valve that is characterized by 2. The sluice valve according to claim 1, further comprising a cleaning nozzle for cleaning a lower body of the lower chamber. 3. The sluice valve according to claim 1, wherein the sealing sheet provided on the valve body and the shutoff plate is made of a soft material so that it can be easily attached and detached.