JPH09133223A - Eccentric valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the connection and disconnection of a seat ring by integrally forming a metal part to be screwed with a body, and a rubber part with which a valve element makes contact for sealing, so as to form a seat ring, and providing a projection part or a groove part, with which a disassembling tool is engaged, in the metal part of this seat ring. SOLUTION: In an eccentric valve 1, a disk-shaped valve body 3 is separately provided from a rotary shaft 4, and the valve element 3 is rotated around the rotary shaft 4 so that the valve element 3 is housed outside of a straight flow passage 6 corresponding to the seat diameter inside of a body 5 at the time of opening a valve and that valve element 3 contacts with an annular seat ring 2 for sealing of the flow passage at the time of closing a valve. In the seat ring 2, a metal part 7 and a rubber part 8 are integrally formed with each other, and the outer peripheral surface of the metal part 7 is provided with a male screw 7a to by screwed with the body 5, and the end surface is provided with a groove part 7b. The seat ring 2 is connected and disconnected by turning a tool after engaging a pair of projection parts, which are provided in the end surface of a short pipe-shaped disassembling tool, with the groove part 7b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentric valve used for pipes of clean water, sewage, agricultural water, industrial water, etc. containing sand, sludge, and other solid matter.

[0002]

2. Description of the Related Art An eccentric valve of this kind is constructed by rotating a disc-shaped valve body, which is provided away from a rotary shaft, around the rotary shaft.
When the valve is opened, it is housed outside the straight flow path that corresponds to the seat diameter in the body, and when the valve is closed, it contacts the annular seat ring to close the flow path, and the eccentric structure increases this contact surface pressure to ensure sealing. It is a valve with a structure that does.

In the seat ring of this eccentric valve, a seat ring in which a metal part and a rubber part are integrally formed by baking or an adhesive is press-fitted into a body, or a male screw provided on the outer peripheral surface of the metal seat ring is used. It is installed by screwing it into the body to install it. Since this eccentric valve is usually a top-entry type, it is not a structure that allows the upper cover to be removed in the piped state and the seat ring from this, so repair or replace this seat ring in the piped state. I couldn't.

However, the seat ring is damaged relatively quickly because water containing sand, sludge, and other solids flows through the eccentric valve. For this reason, it was often necessary to remove the eccentric valve from the pipe for repair.

[0005]

In view of the problem that the conventional eccentric valve must be often removed from the pipe and repaired as described above, the problem to be solved by the present invention is as follows.
With the eccentric valve connected, remove the upper cover,
The purpose of the present invention is to obtain an eccentric valve which enables the seat ring to be removed from this and repaired or replaced.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention integrally integrates a metal portion having an external thread on the outer peripheral surface for screwing into a body and a rubber portion with which a valve body comes into contact and seals. An eccentric valve having a plurality of protrusions or grooves formed on the end face or the inner peripheral surface of the metal part to engage the disassembly and assembly tool.

In the eccentric valve according to the present invention, the upper cover is removed in a piped state, the valve body and the like are also taken out, the disassembling and assembling tool is put in the body from this, and the protruding portion of the seat ring is disassembled. Engage the protrusion of the disassembly / assembly tool with the groove or the groove of the seat ring, rotate the disassembly / assembly tool to loosen the screw connection between the seat ring and the body, and remove the seat ring. It can be taken out and repaired or replaced.

To install the repaired or replaced seat ring in the body, the above procedure may be reversed. In this way, the seat ring can be repaired or replaced while the valve is connected to the pipe, and it is not necessary to remove the valve from the pipe. Therefore, the cost and time required for maintenance and repair can be reduced.

[0009]

1 is a partially cutaway perspective view showing an embodiment of an eccentric valve incorporating a seat ring according to the present invention, in which 1 is an eccentric valve, 2 is a seat ring, and 3 is a valve body. Reference numeral 4 is a rotating shaft, and 5 is a body.

FIG. 2 is a cross-sectional view of the eccentric valve 1, which is closed counterclockwise. In the figure, the disc-shaped valve body 3 is provided apart from the rotary shaft 4, and the valve body 3 is rotated around the rotary shaft 4 and when the valve is opened, as shown by the chain double-dashed line, Straight flow path 6 corresponding to the seat diameter in 5
It is housed outside and is closed to close the flow path by contacting the annular seat ring 2 when the valve is closed.

Center line of the rotary shaft 4 (center point in the figure)
A is away from the center line B-C of the valve body 3, and due to this eccentric structure, the force for rotating the rotary shaft 4 in the direction of the arrow in the valve closed state in the figure is the center line B-C of the valve body 3. In the above, the force acts in the direction indicated by the arrow to increase the contact surface pressure between the valve body 3 and the seat ring 2 to ensure the sealing.

FIG. 3 is a partial sectional view of the seat ring 2 shown in FIGS. 1 and 2, FIG. 4 is a partial plan view of the seat ring 2 of FIG. 3 seen in the direction of the arrow, and FIG. 3 is an external perspective view of the seat ring 2 of FIG.

As shown in FIGS. 3, 4 and 5, the seat ring 2 has a metal portion 7 and a rubber portion 8 integrally formed by baking or an adhesive, and the outer peripheral surface of the metal portion 7 is A male screw 7a for screwing into the body 5 is provided, and
A groove 7b is provided on the end surface. The rubber portion 8 is for contacting and sealing the valve body 3.

Although the metal part is usually made of metal, it can be formed integrally with the rubber part even if it is not metal. As will be described later, the seat ring 2 is attached to the body 5 by using a disassembling and assembling tool. If you have the strength to attach and detach,
Hard synthetic resin may be used. The rubber portion is generally made of rubber, but its surface can be treated with an acid or coated with a film such as PTFE to improve durability.

FIG. 6 is an external perspective view showing an example of an assembling / disassembling tool for attaching / detaching the seat ring 2 shown in FIGS. 1 to 5 to the body 5. The seat ring 2 shown in FIG. It is the drawing which was explained in contrast with an external perspective view. A pair of protrusions 9a are provided on the end surface of the short pipe-shaped disassembling / assembling tool 9, and the protrusions 9a are engaged with the groove 7b of the seat ring 2 in FIG.

Further, a large number of holes 9b are provided from the outer peripheral surface toward the center, and the rotating rod 10 is inserted into these holes 9b as shown in the drawing to rotate the disassembling / assembling tool 9, The seat ring 2 is screwed or loosened on the body 5 to be attached and detached.

FIG. 7 is a partial plan view showing another embodiment of the seat ring of the present invention, in which the groove 7b is provided in the metal portion 7 of the seat ring 2 shown in the partial plan view of FIG. On the other hand, the metal portion 12 of the seat ring 11 of FIG. 7 is provided with the protrusion 12a. Therefore, this seat ring 1
The disassembling / assembling tool for attaching / detaching 1 to / from the body is provided with a groove instead of the protrusion.

FIG. 8 is a partial cross-sectional view showing still another embodiment of the seat ring of the eccentric valve of the present invention, and FIG. 9 is a partial side view of the seat ring 13 of FIG. 8 seen in the direction of the arrow. . In the seat ring 13 shown in FIGS. 8 and 9, the metal portion 14 and the rubber portion 15 are integrally formed by baking or adhesive, and the outer peripheral surface of the metal portion 14 has a male screw 14a for screwing into the body. Is provided on the inner peripheral surface of the groove 14b.
The disassembling / assembling tool for attaching / detaching the seat ring 13 to / from the body is provided with a protrusion that engages with the groove 14b.

FIG. 10 is a partial side view showing another embodiment of the seat ring of the present invention, in which a groove 14b is provided in the metal portion 14 of the seat ring 13 shown in the partial side view of FIG. On the other hand, the metal portion 17 of the seat ring 16 of FIG. 10 is provided with the protrusion 17a, and the disassembling tool for attaching and detaching the seat ring 16 to the body is provided with the groove instead of the protrusion.

Next, the operation will be described based on the embodiment shown in FIGS. In the eccentric valve 1, the upper cover 18 is removed in a piped state, the valve body 3 and the like are also taken out, and the disassembling / assembling tool 9 is opened from the upper opening of the body 5.
Is inserted into the body 5, the groove 9b of the seat ring 2 is engaged with the projection 9a of the disassembling / assembling tool 9, and the rotating rod 10
Rotate the disassembling / assembling tool 9 to rotate the seat ring 2
The seat ring 2 can be removed by loosening the screw connection between the body 5 and the body 5, and can be taken out of the body 5 for repair or replacement.

Assembly of the repaired or replaced seat ring 2 into the body 5 is performed by reversing the above procedure. As described above, since the seat ring 2 can be repaired or replaced while the valve 1 is in the piped state, and the valve 1 does not need to be removed from the pipe, the maintenance repair cost and date and time can be reduced.

[0022]

As described above, in the eccentric valve incorporating the seat ring of the present invention, the upper cover can be removed and the seat ring can be detached using a special disassembly and assembly tool in a piped state. Therefore, it is not necessary to remove the valve from the pipe for maintenance and repair, and it has an excellent effect that the cost and time required for maintenance and repair can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of an eccentric valve in which a seat ring of an eccentric valve of the present invention is incorporated.

2 is a cross-sectional view of the eccentric valve shown in FIG.

FIG. 3 is a partial cross-sectional view of the seat ring shown in FIGS. 1 and 2.

FIG. 4 is a partial plan view of the seat ring shown in FIG. 3 as seen in the direction of the arrow.

5 is an external perspective view of the seat ring shown in FIGS. 1 to 4. FIG.

FIG. 6 is an external perspective view showing an example of a disassembling and assembling tool for attaching and detaching the seat ring shown in FIGS. 1 to 5 to the body.

FIG. 7 is a partial plan view showing another embodiment of the seat ring of the eccentric valve of the present invention.

FIG. 8 is a partial cross-sectional view showing still another embodiment of the seat ring of the eccentric valve of the present invention.

9 is a partial side view of the seat ring shown in FIG. 8 as seen in the direction of the arrow.

FIG. 10 is a partial side view showing another embodiment of the seat ring of the eccentric valve of the present invention.

[Explanation of symbols]

 1 Eccentric valve 2, 11, 13, 16 Seat ring 3 Valve body 5 Body 7, 12, 14, 17 Metal part 7a, 14a Male screw 7b, 14b Groove part 8, 15 Rubber part 9 Disassembly and assembly tool 12a, 17a Projection part

Claims (1)

[Claims] 1. A seat ring is formed by integrally forming a metal portion having an external thread on an outer peripheral surface for screwing into a body and a rubber portion for contacting and sealing a valve body, and forming a seat ring on the metal portion of the seat ring. An eccentric valve characterized in that a projection or a groove for engaging a disassembly and assembly tool is provided on an end surface or an inner peripheral surface.