JPS5829072Y2 - ball valve - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in ball valves.

As shown in FIGS. 1 and 2, a conventional ball valve has a spherical valve body 2 built into a valve box 1 fixed to a hopper or the like, and this valve body 2 is rotated via a shaft by a drive motor 3.

A notch 4 is formed in the valve body, and serves as an inlet and an outlet for the material passing through the valve body 1.

Note that Ia and 'ib are the charging inlet and the outlet of the valve box 1.

When the Conohole Valve is used as an earth removal device for a limited pressure air shield excavator, the earth and sand under the pressure chamber excavated by the shield excavator is discharged to the atmosphere, but the amount of air consumed for pressurized air is A sealing function is required to reduce the amount of water, and for this purpose, a seat is installed between the valve box 1 and the valve body 2 with a spring, and an upper seat 6 and a lower seat 7 are formed.

When collecting earth and sand from below the pressure chamber through the notch 4 of the valve body 2, the lower sheet 7 acts as a seal against air leakage.

Thereafter, as the valve body 2 rotates, the earth and sand contained within the valve body 2 is discharged to atmospheric pressure as the notch 4 of the valve body 2 moves toward the atmospheric pressure side.

In this case, the upper sheet 6 acts as a seal.

However, in this ball valve, the seat 1 and the notched end 5 of the valve body are in contact with the discharged earth and sand, and gravel and the like are caught in the ball valve, and the seat surface and the notched end of the valve body are easily damaged.

As a result, the seat must be replaced more frequently, and the valve body is severely worn out, increasing the amount of air leakage, which is inconvenient when used in a limited pressure air shield excavator or the like.

Conventionally, as shown in U.S. Pat. No. 2,525,831, the valve body was formed with a tapered plug, and in a valve device in which the flag was provided with an opening, the valve body and the plug that came into contact with fluid were used. There are examples of improving corrosion resistance and abrasion resistance by applying a special coating to the surface of the valve. In this case, damage to the seat and valve body cannot be avoided.
There is an example of a ball valve in which the inner surface of the valve box that comes into contact with the fluid is lined with a corrosion-resistant material such as titanium, as in Japanese Patent Publication No. 48-14207. In this case, the valve body is lined with a corrosion-resistant material. Since the valve body is not equipped with a valve, it is not possible to prevent damage to the valve body, and since there are openings on both sides of the valve body, the upstream and downstream sides of the valve body are in communication when the valve is opened. If there is a pressure difference between the two, there is a drawback that it is not possible to prevent air from leaking from the high pressure side to the low pressure side.

Therefore, the present invention eliminates the drawbacks of the prior art, can sufficiently protect the seat and the notch of the valve body, prevents air leakage due to their wear, and is suitable for use in upstream equipment such as limited pressure air shield excavators, etc. The purpose is to minimize air leakage even when there is a pressure difference between the side and the downstream side.

That is, the present invention incorporates a hollow valve body having a notch in the valve body, and the material flowing into the valve body from the charging port of the valve body through the valve body notch is transferred to the valve body by rotation of the valve body. In a ball valve configured to discharge to a box discharge port and in which an annular sheet is mounted on the valve box opening so as to press the valve body, the sheet is protected so as to surround the annular sheet on the inner surface of the valve box facing the flow path. The ball valve is characterized by having a cylinder and a protective ring inside the notch of the valve body, and according to the device of the present invention, the seat protection provided on the inner surface of the valve body as the valve body rotates Solid matter such as gravel is chewed up by the cylinder and a protection ring provided inside the notch of the valve body, and the valve body rotates while storing the chewed gravel inside the valve body and discharged from the discharge port of the valve body. .

Therefore, it is possible to prevent damage to the annular sheet and the notch end of the valve body mounted on the valve box opening, and to suppress the amount of air leakage.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 3, 10 is a valve box, 11 is a valve body having a notch, and 12 is an annular upper sheet.

The upper seat 12 receives the compressive force of a large number of springs 13 installed in the circumferential direction via a spring guide 14, and is in contact with the valve body 11.

The seat 12 moves along a seat guide 15 provided in the valve box 10 according to the amount of wear on the seat 12 and the valve body 11.

Note that the valve box 10 may be shaped to have a guide function without providing the seat guide 15.

Reference numerals 16, 17, and 18 are O-rings that prevent dirt from entering the spring 13 mounting portion.

In this way, the valve body 11 is pressed by the annular upper sheet 12 mounted on the valve box opening, and the sheet protection cylinder 19 is further provided in the valve box 10 so as to surround the annular upper sheet 12.

A protective ring 20 is provided in the notch of the valve body 11 in the housing.

Each end 23, 2 of the sheet protection tube 19 and the protection ring 20
4 may be made of the same material as the valve body and seat protection cylinder body (general carbon steel), or... - do facing (
Hard chrome plating, high hardness material thermal spraying and overlay welding).

It is also possible to appropriately braze the carbide tip on the circumference.

Note that the notch end protection tube 20 is structured so that it does not come into direct contact with the sheet 12.

Next, the function of the ball valve of the present invention when used in a limited pressure air shield bending machine will be explained. From the entrance of the valve box 10, earth and sand are contained in the valve body through a notch provided in the valve body 11. .

Thereafter, the valve body 11 is rotated by a drive device (not shown).

As the valve body 11 rotates, the protective ring 2 of the valve body 11
The notched end 24 of the valve body and the notched end 23 of the seat protection cylinder 19 chew up the gravel 22, etc. (FIG. 4, 21 shows the locus of movement of the outer spherical surface of the valve body.

). The valve body 11 rotates while storing the crushed gravel and the like in the valve body 11, and discharges the earth and sand from an outlet of the valve box 10 (not shown).

As described above, according to the present invention, a hollow valve body having a notch is built into the valve body, and material flowing into the valve body through the charging port of the valve body or the valve body notch is transferred to the valve body. In a ball valve configured to discharge to a valve box discharge port by rotation and having an annular seat mounted on the valve box opening so as to press the valve body, the annular seat is surrounded by the inner surface of the valve box facing the flow path. In addition to providing a seat protection cylinder, a protection ring is provided inside the notch of the valve body, so that the protection ring at the notch end of the valve body, which does not come into direct contact with the seat protection cylinder and seat, will trap debris. This prevents damage to the seat and outer surface of the valve body.

Therefore, it is possible to increase the durability of the valve body and the seat, and to suppress the amount of air leakage, which is industrially useful.

[Brief explanation of drawings]

Fig. 1 is a front sectional view showing a conventional ball valve, Fig. 2 is a sectional view of its main parts, Fig. 3 is a sectional view of main parts showing an embodiment of the present invention, and Fig. 4 is a main part showing its operating state. FIG. 10... Valve box, 11... Valve body, 12.
... Seat, 13 ... Spring, 19
...Sheet protection tube, 20...Protection ring.

Claims (1)

[Scope of utility model registration request] A hollow valve body having a notch is built into the valve body, and the material that has flowed into the valve body from the charging port of the valve body through the valve body notch is discharged to the valve body discharge port by rotation of the valve body. There was no such thing,
In a ball valve in which an annular seat is mounted on the valve body opening so as to press the valve body, a seat protection cylinder is provided on the inner surface of the valve body facing the flow path so as to surround the annular seat, and a notch in the valve body is provided. A ball valve characterized by a guard ring provided inside the valve.