JP2777689B2 - Control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve for closing and controlling the flow of various fluids in a pipeline, and more particularly to a valve seat which cannot be completely closed due to abrasion or damage of a valve seat member. The present invention relates to a member that can be reused.

[0002]

2. Description of the Related Art In a conventional control valve, an inlet, a valve chamber, and an outlet are formed by valve casing, and a valve seat member having a valve port communicating between the inlet and the valve chamber is attached to the valve casing. A valve body that opens and closes the valve port by being seated on and off from the seat member is arranged, and the operating rod is connected to the valve body.By operating the operating rod from outside, the valve body can be seated on the valve seat or separated. Adjust the opening area of the valve port by sitting down, shut off the flow of fluid,
It controls the flow rate.

[0003]

The valve seat member in the above-mentioned control valve is usually formed separately from the valve casing, and the seal surface of the valve port is worn or scratched to completely close the valve. In the event that it is no longer possible, they can be replaced. However,
It is uneconomical to discard a valve seat member after only one use. In addition, since it has to be disassembled for replacement, it is troublesome, and it is necessary to take measures to prevent fluid from flowing into the valve during replacement.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a control valve which can be reused without being disassembled even if abrasion, scratches or the like occur on a seal surface of a valve port of a valve seat member.

[0005]

In order to solve the above-mentioned technical problems, the technical means of the present invention is to form an inlet, a valve chamber, and an outlet by valve casing and communicate the inlet with the valve chamber. A valve seat member having a valve port formed therein is attached to a valve casing, a valve element which is detachably seated on the valve seat member to open and close the valve port is disposed, and an operation rod is connected to the valve element. Is formed in a spherical shape, a plurality of valve ports having the same opening area are formed in a spherical valve seat member, and a valve shaft for rotating each valve port to a position opened and closed by a valve body is connected to the spherical valve seat member. It is a feature.

[0006]

The operation of the above technical means is as follows.
If the seal cannot be completely closed due to wear or damage on the seal surface of the valve port, the other valve ports are opened and closed by rotating the spherical valve seat member with the valve shaft. Can be rotated into position. Therefore, the valve port can be switched without disassembly, and the valve seat member can be reused.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). The valve casing is formed by fastening the lid members 2 and 3 to the main body 1 with bolts (not shown). An inlet 4 and an outlet 5 are formed in the main body 1,
A valve chamber 6 is formed between the main body 1 and the lid member 2. The cover member 3 has a plurality of fluid passage holes 7 formed therein.

A through hole 9 is formed in the transverse wall 8 formed in the main body 1 so that the end on the valve chamber 6 side has a small diameter. An annular upper seal member 10 is disposed at an annular step portion of the through hole 9, a spherical valve seat member 11 is disposed against the upper seal member 10, and a lower seal is disposed against the spherical valve seat member 11. The member 12 is arranged and fixed on the upper end surface of the lid member 3. A first valve port 13 and a second valve port 14 having the same opening area are formed in the vertical direction of the spherical valve seat member 11, and a third valve port 15 and a fourth valve port 16 having the same opening area are formed in the horizontal direction. The opening areas of the first and second valve ports 13 and 14 are formed larger than the opening areas of the third and fourth valve ports 15 and 16.

[0009] A concave portion 17 is formed in the spherical valve seat member 11, and one end of a valve shaft 18 disposed through the main body 1 is fitted and fixed with a holder 19. A handle 20 is provided at the other end of the valve shaft 18.
And fix it with a nut 21. By operating the handle 20 to rotate the valve shaft 18, the spherical valve seat member 11 rotates.

The spherical valve seat member 11 is inserted into the valve chamber 6 from the outlet 5 side.
The valve body 22 to be detached and seated is arranged. Recess 23 in valve body 22
Is formed, and one end of an operation rod 24 for opening and closing the valve body 22 is fitted and fixed with a pin 25. The other end of the operation rod 24 extends upward through a fitting hole 21 opened in the lid member 2. Reference numeral 26 denotes a packing between the lid member 2 and the operation rod 24. By displacing the operating rod 24 up and down, the valve body 22 is separated from and seated on the spherical valve seat member 11 and the valve ports 13, 14,.
15 and 16 are opened and closed.

FIG. 1 shows a closed state in which the valve body 22 closes the first valve port 13. The valve is opened by pulling up the operating rod 24. When the first valve port 13 is worn or scratched, the handle 20 rotates the valve shaft 18 to rotate the spherical valve seat member 180 by 180 degrees, and the second valve port 14 is Position it to be opened and closed. Also, by rotating the spherical valve seat member 11 by 90 degrees from the state shown in the figure, the third or fourth valve ports 15, 16 can be positioned so as to be opened and closed by the valve body 22, and a valve having a small flow rate characteristic is provided. Can be obtained.

[0012]

The present invention has the following specific effects. As described above, according to the present invention, the spherical valve seat member can be switched to another valve port without disassembling the valve casing, so that the valve seat member can be reused. Also, since there is no need to disassemble the valve casing, there is no need for a means for preventing fluid from flowing into the valve.

[Brief description of the drawings]

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

FIG. 2 is a central vertical sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2, 3 Lid member 4 Inlet 5 Outlet 6 Valve chamber 11 Spherical valve seat member 13 First valve port 14 Second valve port 15 Third valve port 16 Fourth valve port 18 Valve shaft 22 Valve body 24 Operating rod

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet are formed by valve casing, and a valve seat member having a valve port communicating the inlet with the valve chamber is attached to the valve casing, and the valve seat member is detached and seated on the valve seat member. A valve body that opens and closes a valve port is arranged, and in a valve body with an operating rod connected thereto, a valve seat member is formed in a spherical shape, and a plurality of valve ports having the same opening area are formed in a spherical valve seat member. A valve shaft for rotating the valve port to a position where it can be opened and closed by a valve body, is connected to a spherical valve seat member.