JPH0765698B2 - How to replace the valve packing cap screw and the replacement valve packing cap screw - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a valve packing pressing screw and a replacement valve packing pressing screw.

[0002]

2. Description of the Related Art As a conventional valve packing pressing screw,
As shown in FIG. 5, a sleeve portion 30a is integrally connected to the lower end of the screw body 5a, and the sleeve portion 30a is provided on both sides of the yoke flange portion 2 shown in FIG. 3, the screw main body 5a penetrates the packing pressing plate 7, and a packing pressing nut 6 is screwed onto the portion protruding above the packing pressing plate 7, and the packing pressing nut 6 is used for the packing pressing plate. It is general-purpose to push down 7 to give a predetermined tightening force to a packing (not shown).

[0003]

In a valve using the above-mentioned conventional valve packing pressing screw, if the valve packing pressing screw cannot be tightened due to rust or corrosion, it is necessary to replace it. First, the packing retainer nut 6
The packing holding plate 7 is then removed, and the valve packing holding screw is replaced. Therefore, according to this method for replacing the valve packing pressing screw, the tightening force to the packing is released when the packing pressing plate 7 is removed, so that the piping system using this valve interrupts the temporary operation and replaces the above. There is a problem that it is necessary to perform work.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for replacing a valve packing holding screw which allows a packing holding bolt to be replaced without interrupting the operation of a piping system. Further, it is an object of the present invention to provide a replacement valve packing pressing screw suitable for the method of replacing the valve packing pressing screw.

[0005]

In order to solve the above-mentioned problems, in order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned claims, has a first step as a method for replacing the valve packing holding screw. As a result, between the packing pressing plate 7 located above the yoke flange portion 2 of the valve body 1 and the valve rod screwing sleeve 9 located further above the packing pressing plate 7, the upper surface is the valve rod screwing An upper pressing plate 21 that contacts the lower surface of the sleeve 9, a lower pressing plate 22 whose lower surface contacts the upper surface of the packing pressing plate 7, and an adjusting screw 23 that changes the distance between the upper pressing plate 21 and the lower pressing plate 22. , 23 are mounted, the existing packing pressing screw is cut and removed in the middle in the second step, and the two parts are protruded on both sides of the yoke flange portion 2 in the third step. Bolt receiving To over click 3,3, the bolt receiving yoke 3
A horizontal through hole 31 through which the
2 are attached to the screw lower end connecting pieces 30, and the lower parts of the packing pressing screws 5 and 5 penetrating the packing pressing plate 7 are respectively inserted into the vertical screw holes 32 of the screw lower end connecting piece 30 in a fourth step. Screw them together, and press the packing holding screws 5, 5
On the upper part of the above, a technical means for screwing a packing holding nut 6 is provided.

Further, as the replacement valve packing pressing screw, a horizontal through hole 31 through which the bolt receiving yoke 3 protruding from the yoke flange portion 2 penetrates, and a vertical screw hole 3 drilled from the upper surface.
2. A technique in which a screw lower end connecting piece 30 having 2 and a lower end portion is screwed into a vertical screw hole 32 of the screw lower end connecting piece 30 and an upper portion thereof is a packing pressing screw 5 protruding upward from the packing pressing plate 7. It is a measure that has been taken.

[0007]

Therefore, according to the method of replacing the valve packing pressing screw of the present invention, the packing pressing plate 7 located above the yoke flange portion 2 of the valve body 1 and the valve rod screw located further above the packing pressing plate 7. Since the packing pressing plate fixing jig 20 is mounted between it and the mating sleeve 9 to fix the packing pressing plate 7, the packing is tightened with a predetermined tightening force even if the existing packing pressing screw is removed in this state. It has the effect of maintaining the state.

It is difficult to replace the existing packing pressing screw with the packing pressing plate 7 fixed, but the existing packing pressing screw can be removed by cutting.

However, as described above, the packing holding plate 7
It is impossible to mount the existing packing pressing screw in which the sleeve portion 30a is integrally connected to the lower end of the conventional screw main body 5a in a state in which is fixed. Therefore, in the packing pressing screw used in the present invention, since the screw lower end connecting piece 30 corresponding to the conventional sleeve portion 30a is formed separately, the screw lower end connecting piece 30 is first attached to the bolt receiving yoke 3.
Then, the packing pressing screw 5 is loosely inserted from above the packing pressing plate 7 into a through hole which is not shown in the figure opened in the packing pressing plate 7, and the lower end thereof is connected to the screw lower end connecting piece 30. It has the action of being mounted by being screwed into the vertical screw hole 32 of.

When it is necessary to replace the packing pressing screw 5 again, the packing pressing screw 5 and the screw lower end connecting piece 30 are unscrewed, so that the packing pressing screw 5 can be replaced by the packing pressing plate 7. Needless to say, it has an effect that allows it to be pulled upward.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the accompanying drawings. First, the illustrated valve will be described.

In the figure, 1 is a valve body, and 2 is an upper flange portion of the valve body 1. It is needless to say that a conventionally known valve mechanism is housed in the valve body 1, and the valve rod 11 of the valve mechanism (not shown) is projected above the yoke flange portion 2 and the valve in the valve body 1 is extended. The outer peripheral portion of the rod 11 is filled with packing (not shown). Further, a packing pressing plate 7 is arranged above the yoke flange portion 2, and the packing pressing plate 7 is configured to tighten the packing through a packing pressing ring 12. Further, a valve rod screwing sleeve 9 is located above the packing pressing plate 7, and the valve rod screwing sleeve 9 is connected and fixed to the valve body 1 by a pair of connecting arms 8, 8. The valve rod 11 is screwed into the valve rod screwing sleeve 9 so that the upper portion of the valve rod 11 extends above the valve rod screwing sleeve 9 and the handle 10 is fixed to the upper end thereof. It is no different from a conventionally known valve.

In the method of exchanging the valve packing pressing screw of the present invention, as a first step, the packing pressing plate 7 located above the yoke flange portion 2 of the valve body 1 and the packing pressing plate 7 located above the packing pressing plate 7 are positioned. An upper pressing plate 21 whose upper surface abuts on the lower surface of the valve shaft screwing sleeve 9 and a lower pressing plate 22 whose lower surface abuts on the upper surface of the packing pressing plate 7, Adjustment screws 23, 23 for changing the distance between the upper pressing plate 21 and the lower pressing plate 22.
The packing pressing plate fixing jig 20 constituted by and is mounted.

In the packing presser plate fixing jig 20, the upper presser plate 21 is, as most apparent from FIG. 2,
An upper body 21a having a U-shape in plan view and an upper attachment plate 21b for connecting the U-shaped opening of the upper body 21a.
And fastening screws 24, 24 for removably fastening the upper attachment plate 21b to the upper body portion 21a. In the hollow portion S surrounded by the upper body portion 21a and the upper attachment plate 21b, The upper holding plate 21 is attached to the connecting arms 8 and 8 so as to be vertically movable so as to surround the connecting arms 8 and 8 so that the connecting arms 8 and 8 are loosely inserted.

Further, the packing pressing plate fixing jig 20 is used.
The lower holding plate 22 has substantially the same shape as the upper holding plate 21, and has an upper body 22a, a lower attachment plate 22b, and a fastening screw for detachably fastening the lower attachment plate 22b to the lower body 22a. 24 and 24.

Further, the adjusting screws 23, 23 are screwed into the upper pressing plate 21, and the lower ends of the screw legs are connected to the upper pressing plate 21.
The distance between the upper pressing plate 21 and the lower pressing plate 22 is changed by moving the upper and lower pressing plates 21 and 23 downward. The lower surface of the lower pressing plate 22 is pressed against the upper surface of the packing pressing plate 7 to the lower surface of the rod screwing sleeve 9, so that the packing pressing plate 7 and the valve rod screwing sleeve 9 are fixed to each other. It has been done.

In the illustrated embodiment, the upper holding plate 2
1 and the lower presser plate 22 are configured such that the both sides are thick and the central part is thin. This is to match the distance between the packing presser plate 7 and the valve rod screwing sleeve 9, and this distance is sufficient. If it is large, the thin part in the middle part can be omitted.

Then, in a second step, the existing packing pressing screw is cut and removed halfway. The existing packing retainer screw is usually the screw body 5 as shown in FIG.
A sleeve portion 30a is integrally connected to the lower end of a, and the sleeve portion 30a is connected to the yoke flange portion 2 shown in FIG.
The bolt main body 5a penetrates the packing pressing plate 7, and the packing pressing nut 6 is screwed to the portion protruding above the packing pressing plate 7. It is usual that the packing holding nut 6 is used to push the packing holding plate 7 downward.
Therefore, the screw body 5a and the sleeve portion 30a cannot be removed unless the packing pressing plate 7 is removed. However, when the screw main body 5a is cut midway (the portion between the packing pressing plate 7 and the valve rod screwing sleeve 9 is cut with a hand saw), the upper portion of the cut screw main body 5a is pulled out upward. The lower portion of the screw body 5a and the sleeve portion 30a can be detached from the bolt receiving yoke 3. In some cases, the split pin 13 may prevent the sleeve portion 30a from falling off from the bolt receiving yoke 3. In this case, therefore, the sleeve portion 30a should be removed from the bolt receiving yoke 3 after the split pin 13 is removed. Is of course.

In a third step, bolt receiving yokes 3, 3 projecting from both sides of the yoke flange portion 2 are provided with horizontal through holes 31 through which the bolt receiving yoke 3 penetrates and vertical screw holes 32 bored from the upper surface. The screw lower end connecting pieces 30 having the above are mounted respectively.

The screw lower end connecting piece 30 has a horizontal through hole 31 having a diameter through which the existing bolt receiving yoke 3 penetrates, and a vertical screw hole 32 is provided from the upper surface toward the horizontal through hole 31. It goes without saying that the vertical screw hole 32 is designed so that the packing pressing screw 5 described later can be screwed therein.

Then, as a fourth step, the lower parts of the packing pressing screws 5, 5 penetrating the packing pressing plate 7 are respectively screwed into the vertical screw holes 32 of the screw lower end connecting piece 30,
A packing pressing nut 6 is screwed onto the upper parts of the packing pressing screws 5, 5.

Since the packing holding plate 7 is still fixed by the packing holding plate fixing jig 20, the existing one is used as it is, and the packing holding screws 5 and 5 are newly removed because the former ones are cut and removed. The prepared one is used. The packing pressing screws 5, 5 are loosely inserted into the packing pressing plate 7 above the packing pressing plate 7 through a not-shown through hole, and the lower part thereof is screwed into the vertical screw hole 32 of the screw lower end connecting piece 30. Good. The packing pressing nut 6 is screwed onto the upper parts of the packing pressing screws 5 and 5, and the tightening of the packing pressing nut 6 gives a tightening force to the packing, as in the conventional case. Although the packing holding nuts 6 and 6 are screwed together to complete the replacement of the valve packing holding screw, the packing holding plate fixing jig 20 is then replaced.
It is of course possible to remove the packing holding plate, and practically, after removing the packing holding plate fixing jig 20, readjustment of the tightening force of the packing holding nuts 6 and 6, work such as mounting of the split pin 13 and leakage inspection. Confirmation work such as is performed.

Another aspect of the present invention relates to a replacement valve packing pressing screw used in the above method for replacing the valve packing pressing screw, wherein the replacement valve packing pressing screw is:
A screw lower end connecting piece 30 having a horizontal through hole 31 through which the bolt receiving yoke 3 protrudingly provided on the yoke flange portion 2 passes, and a vertical screw hole 32 bored from the upper surface, and the screw lower end connecting piece 3
The lower end portion is screwed into the vertical screw hole 32 of 0, and the upper portion is the packing pressing screw 5 protruding upward from the packing pressing plate 7.

That is, in the valve packing pressing screw, the sleeve portion 30a is integrally connected to the lower end of the screw main body 5a in the past, whereas the packing pressing screw 5 corresponding to the screw main body 5a and the sleeve portion 30a. It is divided into a screw lower end connecting piece 30 and the packing pressing screw 5 and the screw lower end connecting piece 30 can be attached and detached by a vertical screw hole 32.

If the valve packing pressing screw of the present invention is used from the beginning, or if the valve packing pressing screw of the present invention is replaced, it is necessary to replace the valve packing pressing screw. In the method for replacing the valve packing pressing screw of the present invention, it is not always necessary to cut and remove the packing pressing screw 5, and the screw lower end connecting piece 30
As described above, the packing pressing screw 5 may be removed by removing the screw engagement with.

[0026]

Since the present invention is as described above, it is possible to provide a method for replacing a valve packing holding screw which allows the packing holding bolt to be replaced without interrupting the operation of the piping system.

Particularly, the present invention relates to a packing pressing plate fixing jig 2
It is necessary to install 0, and it is necessary to prepare a special valve packing pressing screw, but these complications are tolerable in comparison with interrupting the operation of the piping system. Not only that, but when the operation of the piping system is interrupted and the replacement work is performed, there is a risk of causing an unexpected accident due to contact mistakes, work procedure wrapping, etc.
Use of the valve packing pressing screw replacement method and the replacement valve packing pressing screw of the present invention has a remarkable effect of avoiding such a risk.

[Brief description of drawings]

FIG. 1 is a perspective view of a valve having a valve packing holding screw replaced by the method of the present invention.

FIG. 2 is a partial plan view without an upper portion.

FIG. 3 is a front view of a main part.

FIG. 4 is an exploded perspective view of parts of the replacement valve packing holding screw of the present invention.

FIG. 5 is a perspective view of a conventional valve packing pressing screw.

[Explanation of symbols]

 1 Valve body 2 Yoke flange 3 Bolt receiving yoke 5 Packing retainer screw 6 Packing retainer nut 7 Packing retainer plate 9 Valve rod screwing sleeve 20 Packing retainer plate fixing jig 21 Upper retainer plate 22 Lower retainer plate 23 Adjustment screw 30 Screw lower end Connection piece 31 Horizontal through hole 32 Vertical screw hole

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tokuyuki Asanuma 15 Hisamoto, Takatsu-ku, Kawasaki-shi, Kanagawa Hirata Valve Industry Co., Ltd. (72) Masazumi Goto 15 Hisamoto, Takatsu-ku, Kawasaki, Kanagawa Within the corporation

Claims (2)

[Claims] 1. A packing pressing plate (7) located above a yoke flange portion (2) of a valve body (1) and a valve rod located above the packing pressing plate (7) as a first step. An upper pressing plate (2) whose upper surface abuts the lower surface of the valve rod screwing sleeve (9) between the screwing sleeve (9).
1), a lower pressing plate (22) whose lower surface abuts the upper surface of the packing pressing plate (7), and an adjusting screw (2) for changing the distance between the upper pressing plate (21) and the lower pressing plate (22).
3, 23) and a packing holding plate fixing jig (2
0) is mounted, and as a second step, the existing packing pressing screw is cut and removed in the middle, and as a third step, the bolt receiving yokes (3, 3) projecting on both sides of the yoke flange (2) are attached. , A screw lower end connecting piece (30) having a horizontal through hole (31) through which the bolt receiving yoke (3) penetrates and a vertical screw hole (32) drilled from the upper surface are respectively attached, and as a fourth step, the packing is performed. The lower parts of the packing pressing screws (5, 5) penetrating the pressing plate (7) are respectively screwed into the vertical screw holes (32) of the screw lower end connecting piece (30), and the packing pressing screws (5, 5) are screwed. A method for replacing the valve packing holding screw, in which the packing holding nut (6) is screwed onto the upper part of the. 2. A screw lower end connecting piece having a horizontal through hole (31) through which a bolt receiving yoke (3) protruding from a yoke flange portion (2) penetrates and a vertical screw hole (32) drilled from the upper surface. 30) and the lower end portion is screwed into the vertical screw hole (32) of the screw lower end connecting piece (30), and the upper portion is a packing pressing screw (5) protruding upward from the packing pressing plate (7). Replacement valve packing retaining screw.