JP2523001Y2 - Malfunction prevention 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 rotary valve manufactured by inexpensively manufacturing a valve main body by using a commercially available pipe, while preventing a malfunction by separating an opening / closing operation portion of the valve from the valve main body.

[0002]

2. Description of the Related Art There are extremely many types of valves interposed in a liquid pipe such as a general water pipe, depending on the use and function of the valve. Mechanism is always installed. This opening / closing operation part is integral with the valve body, and usually protrudes more than twice as large as the flow path dimension. Even the simplest rotary valve, such as a butterfly valve or a ball valve, that rotates the valve body at a rotation angle of 90 degrees between the flow path blocking position and the fully open position, the handle or lever for this rotation operation is externally provided. It was mounted protruding, so no wonder.

[0003] By the way, in piping construction, a number of valves are installed in a pipeline, but they are not usually used. There are also valves for switching and shutting off. In fact, even such emergency valves have been installed without any resistance, similar to ordinary valves installed in other places.

[0004]

[Problems to be solved by the invention] In piping construction, the cost of the valve in the piping material is extremely high. This is due to the high costs involved in manufacturing the valve itself. In particular, commercially available valves are manufactured by precision-machining a valve case made of a cast product, and are loaded with a valve body, sealing material, valve stem, valve stem operating mechanism, etc. through a number of processes while maintaining airtightness. ， In addition to material costs, production costs are necessarily high. In order to fundamentally improve such points, the present inventors have already disclosed JP-A-2-229633,
Japanese Patent Application Laid-Open No. 2-229634, Japanese Utility Model Application No. 2-2647, Japanese Utility Model Application No. 2-7391
In No. 6, etc., a simple valve using a general commercial pipe as a valve case is proposed. The present invention likewise proposes a valve which is much cheaper than a conventional valve.

[0005] Part 2. If the emergency valve interposed in the pipe as described above is provided with an integrated operation unit similarly to the ordinary valve, there is a risk that the emergency valve may be operated casually. This can cause serious trouble in the system or even lead to an accident. Although a large number of valves with handles arranged in an orderly manner are convenient in terms of piping construction and ease of use, it can be said that the presence of an emergency valve in them is rather risky. An object of the present invention is to solve such a problem.

Third. The operating section for opening and closing the valve protrudes more than twice the pipe diameter, so a piping space for this is required. In addition, when such an operation mechanism is attached to the emergency valve integrally with the valve, the less the operation frequency, the more the operation mechanism is wasted. In addition, if an operation mechanism is present, the heat insulation winding work is troublesome in this part. Another object of the present invention is to solve such a problem.

[0007]

[Means for Solving the Problems] The present invention relates to a valve case composed of a commercially available tube cut to a required length, and a central axis of the tube.
And inserting the valve body for rotation about a straight interlinking axis, with attached perpendicular bonnet portion outside the valve case, a valve stem mounted for rotation about an axis within the bonnet portion of the valve case A rotary valve penetrating through a pipe wall and connected to the valve body; and a key portion for imparting a rotation around a shaft to a valve stem in the bonnet portion, and a valve opening and closing separated from the valve. An operating tool; stopper means for restricting the amount of rotation of the valve stem when rotating the valve stem with the valve opening / closing operating tool by engaging the key portion; and when operating the valve stem in the bonnet portion. The present invention provides a malfunction prevention valve including a cover member that conceals during a period other than the above. In this case, the stopper means can be formed by a notch provided in the bonnet portion and a stopper provided in the valve stem or the valve opening / closing operation tool so as to protrude into the notch. The cover member has a cylindrical body covering the entire hood,
It consists of a cap attached to the tip of this cylindrical body,
The entire cover with a cap is fixed to the valve case using a detachable band. The valve opening / closing operation tool may be provided with a safety key which cannot be removed except when the valve body is in either the fully closed position or the fully open position.

[0008]

FIG. 1 shows an entire rotary valve according to the present invention. 1 denotes a valve case, 2 denotes a bonnet, and 3 denotes a valve stem. The valve case 1 is manufactured using a commercially available tube cut to a required length, and a valve element (not shown) is mounted in the valve case 1.
The valve body is disclosed in Japanese Patent Application Laid-Open Nos.
No. 229634, Japanese Utility Model Application No. 2-2647, Japanese Utility Model Application No. 2
Such as a butterfly valve or a ball valve as proposed in US Pat.
It mounted for rotation between a fully closed position and the fully open position around a straight interlinking axis. The bonnet 2 is provided on the outside of the valve case 1 by welding or the like, and a valve stem 3 is rotatably inserted into the bonnet 2, and the valve stem 3 penetrates through the pipe wall of the valve case 1 and is internally provided. Connected to the valve body. Therefore, by rotating the valve stem 3 about its axis, the valve element blocks or opens the flow path. The bonnet 2 also uses a small-diameter commercially available tube.

In such a rotary valve, in the present invention, the valve opening / closing operation tool 4 (the handle in the illustrated example) for rotating the valve stem 3 is a separate part separated from the valve body.
A predetermined key structure, which will be described in detail later, is formed between the valve opening / closing operation tool 4 and the valve stem 3.
Further, a cover 5 that completely covers the bonnet 2 and the valve stem 3 therein is attached. In the illustrated example, the cover 5 includes a cylindrical body 6 that covers the entire bonnet and a cap 7 that is attached to the tip of the cylindrical body 6. The entire cover with the cap includes a band 8 that can be detachably attached to the valve case 1. It is fixed using. The band 8 is made of a flexible material and is integrally connected to the lower edge of the cylindrical body 6. The band 8 is turned around the outer periphery of the valve case 1 and fixed with the buckle 9. The buckle 9 is provided at one end of the band.
The cover 5 is removably fixed to the valve case 1 by inserting the other end 10 with a locking piece into the cover. With the cover 5 attached in this manner, the bonnet 2 and the valve stem 3 therein can be completely concealed by putting the cap 7 on. Therefore, the portion protruding from the valve case 1 is also kept warm, and the occurrence of dew condensation on this portion is also prevented. Further, the whole of the valve case 1 can be provided with the heat retaining winding 12 similarly to the connection pipe 11, so that dew condensation at this portion is prevented. The outer diameter of the heat insulating winding 12 is
In the finished state, the portion protruding from the pipeline completely disappears, and dew condensation at the valve operating portion is also prevented. This is an effect that could not be achieved with a conventional valve.

FIGS. 2 and 3 show a key structure and a stopper structure of the valve opening / closing operation tool 4 and the valve stem 3. FIG.
As shown in FIG. 3, a valve stem 3 made of a round rod is rotatably housed in the bonnet 2 so as to be in sliding contact with the inner peripheral surface of the bonnet 2 made of a circular pipe. Piece
A recess 16 is provided at the tip of the valve opening / closing operation tool 4 shown in FIG. This protruding piece
The key portion is composed of the recess 15 and the recess 16. That is, the valve opening / closing operating tool 4 is overlapped on the same axis as the valve stem 3, and the projection 15
When the valve opening / closing operation tool 4 is rotated around an axis in a state where the valve rod 3 is engaged with the concave portion 16 of the valve opening / closing operation tool 4, the valve stem 3 also rotates around the axis, so that the flow path can be shut off and opened. At that time, a stopper means for regulating the rotation amount is provided. In FIG. 3, the stopper means comprises a cutout portion 17 obtained by cutting a part of the tubular bonnet 2 by about 45 degrees, and a stopper 18 provided on the peripheral wall of the valve stem 3 so as to project into the cutout portion 17. . The stopper 18 can freely rotate around the axis by about 45 degrees in the notch 17, but the other rotation is restricted by the walls 19 and 20 of the notch 17. One wall
By setting the valve body to a position where the valve blocks the flow path when the stopper 18 abuts on the position 19 and a position where the valve body opens the flow path when the stopper 18 abuts on the other wall 20 or vice versa. By doing so, the operation of completely closing or fully opening the flow path can be performed without fail.

FIGS. 4 and 5 show the same structure as FIGS. 2 and 3 except that a stopper piece 21 is attached to the tip of the valve opening / closing operation tool 4 as a stopper means. That is, the stopper piece 21 is provided at the tip of the valve opening / closing operation tool 4 so as to protrude into the notch 17 provided in the bonnet 2 as in FIG. Also in this case, when the projection piece 15 and the recess 16 are engaged with each other, the valve body cuts off the flow path at the position where the stopper piece 21 abuts on one wall 19 of the notch 17 and the other wall 20 By setting the position where the valve body opens the flow path at the position where the stopper 21 abuts, or vice versa, the operation of completely closing or fully opening the flow path can be performed without fail.

FIGS. 6 and 7 show an example in which a safety key means is provided to prevent the valve opening / closing operation tool from being inserted / removed except when the valve body is at either the fully closed position or the fully open position. Is shown. As shown in FIG. 6, the safety key means includes a claw 23a, 23b provided at the tip of the valve opening / closing operation tool 4 via a rod 22a, 22b, and the claw 23a, 23b as shown in FIG. Cover 5 for guiding along the inner peripheral surface of cover 5
And grooves 25a and 24b in the axial direction and a groove 25 in the circumferential direction. In addition, the rod of the valve opening / closing
The notch 17 is provided in the bonnet 2 as shown in FIG. 7 so that the stoppers 22a and 22b have the same stopper function as the stopper 21 in FIG. However, since there are two rods, two notches are also provided.

FIG. 8 illustrates only the cover portion of FIG. 7, and includes axial grooves 24a and 24b and a circumferential groove 25 provided on the inner peripheral surface of the cover 5 for guiding the claws 23a and 23b. Is shown in more detail. As shown, the axial groove
The lower ends of 24a and 24b communicate with the circumferential groove 25. As a result, the claws 23a, 23b descending along the grooves 24a, 24b
After hitting the groove 25, it is guided in the circumferential direction along the groove 25. Since the relative positional relationship between the cover 5 and the bonnet 2 is fixed, for example, by the band 8, the relative positional relationship between the valve opening / closing operation tool 4 and the bonnet 2 and thus the valve rod 3 is determined by the claw 23 and the groove. It is restricted by 24 and cannot be pulled out except when the claw 23 is guided in the groove 24. That is, even when the pawl 23 is guided in the circumferential direction to rotate the valve stem 3, the valve opening / closing operation tool 4 and the cover 5 must be rotated again to the point where they fit into the groove 24.
The engagement relationship with is not released. Therefore, assuming that the valve is in a state of blocking the flow path at the position where the claw 23 is engaged with the groove 24, the claw 23 rotates 90 degrees along the circumferential groove 25 to open the flow path. Even in this open state, the valve opening / closing
Cannot be removed from the cover 5, but can be removed only when the flow path is shut off by reversely rotating 90 degrees again. Similarly,
If the valve element is in a state where the flow path is opened at the position where the claw 23 is engaged with the groove 24, the valve can be removed only in this open state, and cannot be removed in the cutoff position. Therefore,
When it is necessary to open or shut off the flow path, the valve opening / closing operation tool 4 is set in a state where it cannot be inserted / removed during this operation, and when the operation is completed, the valve is rotated reversely to remove the valve. At this point, by removing the valve opening / closing operation tool 4 along the groove 24, the opening / closing state of the valve can definitely return to the state before the operation.

[0014]

[Effects of the Invention] As described above, according to the present invention, there is no longer any opening / closing operation mechanism integrated with the valve existing in the conventional valve, and the valve opening / closing operation tool is stored separately. become. For this reason, even if the valve of the present invention is interposed in the same pipe as the emergency valve as the normal valve, it can be prevented from being opened and closed by mistake. Also, since the same number of valves can be operated with one valve opening / closing operation tool, the number of valve opening / closing operation tools can be reduced, and the valve itself uses a commercially available pipe. It is much cheaper than one-piece products. In addition, the prevention of dew condensation on the valve opening / closing operation portion, which could not be achieved with the conventional valve, is achieved, and the space occupied by the valve can be minimized. For this reason, if the rotary valve of the present invention is adopted as an emergency valve used only at a special time during testing and maintenance, malfunction can be prevented and dew condensation at the valve portion can be effectively prevented. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire malfunction prevention valve according to the present invention.

FIG. 2 is a perspective view showing an example of a valve opening / closing operation tool according to the present invention.

3 is a perspective view showing a bonnet portion and a valve stem portion for explaining a key relationship and a stopper relationship with the valve opening / closing operation tool of FIG. 2;

FIG. 4 is a perspective view showing another example of the valve opening / closing operating tool according to the present invention.

FIG. 5 is a perspective view showing a bonnet portion and a valve stem portion for explaining a key relationship and a stopper relationship with the valve opening / closing operation tool of FIG. 4;

FIG. 6 is a perspective view showing another example of the valve opening / closing operation tool according to the present invention.

7 is a perspective view showing a bonnet portion, a valve stem portion, and a cover portion for explaining a safety key relationship and a stopper relationship with the valve opening / closing operation tool of FIG. 6;

8 is a cutaway perspective view showing a cover part of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve case which consists of a commercially available pipe 2 Bonnet 3 Valve rod 4 Valve opening / closing operation tool 5 Cover with a cap 6 Cylindrical body of a cover 7 Cap 8 Band 9 Buckle 15 Protrusion piece at the top of a valve stem 16 Recess of a valve opening / closing operation tool 17 Bonnet Notch 18 Stopper at valve stem peripheral wall 21 Stopper at tip of valve opening / closing operating tool 22 Rod at tip of valve opening / closing operating tool 23 Claw 24 Axial groove formed on inner circumferential surface of cover 25 Circle formed on inner circumferential surface of cover Circumferential groove

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-199995 (JP, A) JP-A-60-10977 (JP, U) JP-A-63-185977 (JP, U) 35020 (JP, Y2)

Claims (3)

(57) [Scope of request for utility model registration] 1. A consists of commercially available tube, which is cut to required length
A valve body that rotates around an axis perpendicular to the center axis of this pipe is inserted into the valve case, and a bonnet is mounted orthogonal to the outside of the valve case, and the hood is rotated around the axis inside the bonnet. A rotary valve formed by connecting a valve stem that is attached to the valve body through the pipe wall of the valve case, and a key portion for imparting a rotation around the axis to the valve stem in the bonnet portion. A valve opening / closing operation tool provided and separated from the valve; and stopper means for restricting a rotation amount of the valve stem when the key portion is engaged to rotate the valve stem with the valve opening / closing operation tool. And a cover member for concealing the valve stem in the bonnet except during operation , and a cylindrical body covering the entire bonnet.
And a cap attached to the tip of the cylindrical body.
The entire cover with cap is attached to and detached from the valve case.
A malfunction prevention valve consisting of a cover member fixed using the existing band and 2. The valve opening / closing operation tool includes a safety key for preventing the valve body from being inserted / removed except when the valve body is in one of a fully closed position and a fully opened position .
The malfunction prevention valve according to claim 1, wherein the malfunction prevention valve is placed in an engagement relationship with a keyway provided in the cover member . 3. A rotary valve lockout valve according than the operation portion for the valve rod operation in interposed usage state to claim 1 or 2 is coated with a heat insulating material in the piping.