JP2533607B2 - Valve disc guide structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a valve body guide structure of a valve suitable for use in pipelines for agricultural and marine equipment, water treatment equipment, building equipment, plant equipment, water supply and the like.

[Prior Art] As a conventional valve, for example, as described in Japanese Utility Model Publication No. 48-28335 and Japanese Utility Model Publication No. 57-134478, a valve box that forms a fluid flow path and a valve chamber, and a valve box that rotates with respect to the valve box. It has a valve rod that is connected in a state that it does not move in the direction of its own axis and that has a male threaded portion for the valve body located inside the valve box, and a female threaded portion that is screwed to the male threaded portion of the valve rod. , A valve chamber seal part that is supported in a state that it moves in the valve stem axial direction with respect to the valve box but does not rotate, and that is in close contact with the valve chamber inner surface that communicates with the fluid flow path of the valve box, and the fluid flow path of the valve box A valve body having a valve seat seal portion that closely adheres to the inner surface,
It is fixed to the portion of the valve stem located outside the valve box, drives the valve disc through the valve stem, and makes the valve chamber seal part and valve seat seal part of the valve disc correspond to the corresponding valve chamber inner face and fluid flow passage inner face. Some of them have an operating member that comes into contact with and separates from each other.

In the above-mentioned conventional valve, the engaging protrusion is provided on the upper side surface portion of the valve body with respect to the valve chamber seal portion, and the engaging protrusion of the valve body is valved on the inner surface defining the valve chamber of the valve box. A guide groove that slidably supports in the axial direction of the rod is provided. This allows
When the valve rod rotates, the valve body moves up and down by being guided by the guide groove to open and close the fluid passage of the valve box.

[Problems to be Solved by the Invention] However, in the above-mentioned valve body guide structure for a conventional valve, a long vertical range corresponding to the total opening / closing stroke of the valve body on the inner surface defining the valve chamber of the valve box. It is necessary to provide the guide groove described above. In addition, the guide groove must have an inner diameter larger than the outer diameter of the valve chamber seal portion so that the valve chamber seal portion of the valve body does not interfere.

Therefore, the outer diameter of the valve chamber in the valve box becomes large over a long range in the axial direction of the valve stem, which increases the gap size between the pipe joint flange portions at both ends of the valve box and the valve chamber outer surface, for example. The workability of the valve is impaired by making it difficult to install the bolts and nuts in the parts.

Further, since the uneven surface of the guide groove is formed in a wide range of the inner surface that defines the valve chamber of the valve box, the stress due to the reaction of the detent force applied to the valve body and the water pressure entering the valve chamber The resulting stress concentrates on the uneven surface, and the valve box is likely to be deformed or damaged, resulting in poor durability.

An object of the present invention is to improve the workability of the valve and the durability thereof under the condition that the valve body is reliably guided along the axial direction of the valve stem.

MEANS FOR SOLVING THE PROBLEM The present invention relates to a valve box that forms a fluid flow path and a valve chamber, and is connected to the valve box while rotating with respect to the valve box but not moving in the direction of its own axis. It has a valve rod with a male threaded portion for the valve body at the position where it is located, and a female threaded portion that is screwed to the male threaded portion of the valve rod. Of the valve body, which is supported in a non-contact state and has a valve chamber seal portion that is in close contact with the inner surface of the valve chamber that communicates with the fluid flow path of the valve box, and a valve seat seal portion that is in close contact with the inner surface of the fluid flow path of the valve box. It is fixed to the part located outside the valve box and drives the valve element through the valve stem,
A valve body guide structure for a valve, comprising a valve chamber seal portion and a valve seat seal portion of the valve body, and an operating member for bringing the valve seat seal portion into contact with and separate from the inner surface of the fluid flow path. An upper engaging portion is provided on the upper side surface portion above the seal portion, and a lower engaging portion is provided on the lower side surface portion below the valve chamber seal portion of the valve body, and an upper inner surface that defines the valve chamber of the valve box. The upper guide member is detachably attached to the valve housing, the lower guide portion is provided on the inner surface that defines the fluid flow path of the valve box, and the inner diameter of the upper guide member is smaller than the outer diameter of the valve chamber seal portion. It is set to be larger than the outer diameter of the body, and the valve body is supported only by the guide member when the valve body is fully opened, and the valve body is supported only by the lower guide portion when the valve body is fully closed. Is.

[Operation] According to the present invention, when the valve rod is rotated by the operating member, the valve element moves up and down while being guided only by the upper guide member when the valve is fully opened, and when the valve intermediate opening degree is reached. The upper guide member and the lower guide portion guide the body to move up and down. On the fully closed side of the valve, only the lower guide portion guides the body to move up and down. As a result, the fluid passage of the valve box is opened and closed.

Here, in the present invention, the upper guide member is detachably provided on the inner surface that defines the upper portion of the valve chamber of the valve box, and the inner diameter of the upper guide member is set smaller than the outer diameter of the valve chamber seal portion. did. Therefore, the outer diameter of the upper engaging portion of the valve body can be set to a value close to or less than the outer diameter of the valve chamber seal portion, and as a result, the outer diameter of the valve chamber in the valve box is long in the axial direction of the valve stem. Can be reduced over range. This makes it possible, for example, to increase the size of the gap between the outer surface of the valve chamber and the pipe joint flange portion, and to improve the ease of mounting and assembling the bolts and nuts on the pipe joint flange portion. Can be improved. At this time, when the valve body is attached to or detached from the valve box, the upper guide member can be removed from the inner surface of the valve box, so that the valve chamber seal part of the valve body does not interfere with the upper guide member of the small inner diameter. The valve body can be securely attached and detached.

Further, in the present invention, since the guide portion for guiding the valve body in the axial direction of the valve stem is divided into the upper guide member on the valve chamber side and the lower guide portion on the fluid flow path side, the valve chamber of the valve box is formed. It is not necessary to form a concavo-convex surface for forming the guide portion in a wide range of the inner surface that defines the. This means that the stress due to the reaction to the detent force applied to the valve body and the stress due to the water pressure penetrating into the valve chamber are less likely to concentrate on the inner surface of the valve box, and the deformation and damage of the valve box can be prevented.

That is, it is possible to improve the workability of the valve and the durability under the condition that the valve body is reliably guided along the axial direction of the valve stem.

[Embodiment] FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is an exploded view of FIG. 1, and FIG. 1 is a sectional view taken along the line IV-IV in FIG. 1, FIG. 5 is a sectional view schematically showing the lower guide portion, and FIG. 6 is VI- in FIG.
It is sectional drawing which follows the VI line.

The valve 10 includes a valve box 11 and a valve stem as shown in FIGS.
It has a valve body 12, a valve body 13, and a cap (operation member) 14.

The valve box 11 is composed of a housing 15, an upper guide member 16, a bonnet 17, and a valve rod receiving plate 18, and the housing 15, the bonnet 17, and the valve rod receiving plate 18 are connected by a fixing bolt 19. However, the upper guide member 16 is held between the housing 15 and the valve rod receiving plate 18. The housing 15 forms a fluid channel 15A and also forms a valve chamber 15B, has pipe joint flanges 15C at both ends of the fluid channel 15A, and has an assembly flange portion 15D at the upper end of the valve chamber 15B.

The valve rod 12 has an intermediate flange portion 12A held between the upper guide member 16 and the valve rod receiving plate 18, and is connected to the valve box 11 while rotating but not moving in its own axial direction. Valve rod 12
Has a valve-pair external thread 12B at the lower end located inside the valve box 11 (the valve chamber 15B of the housing 15).

The valve element 13 integrally includes a female screw nut (female screw part) 21 which is screwed to the male screw part 12B of the valve rod 12. The valve body 13 is
The guide structure, which will be described in detail later, supports the valve box 11 while moving it in the valve stem axial direction but not rotating it.

Further, the valve body 13 is provided with a valve chamber seal portion 22 and a valve seat seal portion 23 which are T-shaped in FIG. Valve chamber seal
Reference numeral 22 is made of an elastic sealing material, and comes in contact with and separates from the ring-shaped inner surface of the valve chamber 15B when the valve body 13 moves up and down, and comes into close contact with the inner surface of the valve chamber 15B when the valve is closed. The valve seat seal portion 23 is also made of an elastic seal material and is used as a fluid passage when the valve body 13 moves up and down.
It comes close to and separates from the U-shaped inner surface of 15A and comes into close contact with the inner surface of the fluid flow path 15A when the valve is closed.

The cap 14 is fixed to the upper end located outside the valve rod 12 so that the box spanner can be attached and detached, and the valve disc 12
13 is moved up and down, and the valve chamber seal part 22 and the valve seat seal part of the valve body 13 are moved.
23 is brought into contact with or separated from the inner surface of the corresponding valve chamber 15B and the inner surface of the fluid flow path 15A.

Thus, an upper engaging portion 24 along the axial direction of the valve rod is provided at four positions in the circumferential direction of the upper side surface portion of the valve body 13 with respect to the valve chamber sealing portion 22, and the upper engaging portion 24 of the valve body 13 with respect to the valve chamber sealing portion 22 is provided. A lower engaging portion 25 is provided along the axial direction of the valve rod at the circumferential method 4 position on the side surface portion. On the other hand, on the inner surface that defines the upper part of the valve chamber 15B of the valve box 11, the upper guide portion 26 provided at four positions in the circumferential direction of the lower surface of the upper guide member 16 is detachably mounted, The upper engaging portion 24 of the valve body 13 is supported slidably in the axial direction of the valve rod (see FIG. 4). The upper guide member 16 is a housing
It is engaged with an engagement recess 100 provided in 15 and is prevented from rotating. A lower guide portion 27 that supports the lower engagement portion 25 of the valve body 13 slidably in the valve rod axial direction is provided at four positions in the circumferential direction on the inner surface that defines the fluid flow path 15A of the valve box 11. It is provided (see FIGS. 5 and 6).

Here, the inner diameter K of the upper guide portion 26 included in the upper guide member 16
Is set to be smaller than the outer diameter (water stop diameter) D of the valve chamber seal portion 22, and the outer diameter H of the upper engagement portion 24 of the valve body 13 is set to the outer diameter (water stop diameter) D of the valve chamber seal portion 22. It is set to a value close to or less than that.

Then, in the valve 10, when the valve body 13 is fully opened, the valve body 13 is supported only by the upper guide portion 26, and when the valve body 13 is fully closed, the valve body 13 is supported only by the lower guide portion 27. To support.

 Next, the operation of the above embodiment will be described.

According to the above-described embodiment, when the valve rod 12 is rotated by the cap 14, the valve body 13 moves up and down while being guided only by the upper guide portion 26 on the valve fully open side, and at the valve intermediate opening degree. Is moved vertically by being guided by the upper guide portion 26 and the lower guide portion 27, and is vertically moved by being guided only by the lower guide portion 27 on the valve fully closed side.
As a result, the fluid flow path 15A of the valve box 11 is opened and closed.

Here, in the above embodiment, the upper guide member 16 is detachably provided on the inner surface defining the upper part of the valve chamber of the housing 15, and the inner diameter K of the upper guide portion 26 included in the upper guide member 16 is It was set smaller than the outer diameter D of the valve chamber seal portion 22. Therefore, the outer diameter H of the upper engagement portion 24 of the valve body 13 can be set to a value close to or less than the outer diameter D of the valve chamber seal portion 22, and as a result, the outer diameter G of the valve chamber 15B in the housing 15 can be set. Can be reduced over a long range in the axial direction of the valve stem. This means that, for example, the outer surface of the valve chamber 15B and the pipe joint flange portion 15C
It is possible to increase the clearance dimension l between the valve and the valve, and to improve the workability of the valve 10 by improving the mounting and assembling of the bolt and nut to the pipe joint flange 15C. At this time, when attaching and detaching the valve body 13 to and from the housing 15,
Since the upper guide member 16 including the upper guide portion 26 can be removed from the inner surface of the housing 15, the valve body 13 can be securely attached and detached without the valve chamber seal portion 22 of the valve body 13 interfering with the upper guide portion 26 of the small inner diameter. it can.

Further, in the above embodiment, the guide portion for guiding the valve body 13 in the valve stem axial direction, the upper guide portion 26 provided in the upper guide member 16 on the valve chamber side, and the lower guide portion 27 on the fluid flow path side. Because it was divided into
It is not necessary to form a concavo-convex surface for forming the guide portion in a wide range of the inner surface that defines the valve chamber 15B of the valve 11. This is
The stress due to the reaction of the detent force applied to the valve body 13 and the stress due to the water pressure penetrating into the valve chamber 15B are less likely to concentrate on the inner surface of the valve box 11, and the deformation and damage of the valve box 11 can be prevented. .

That is, the workability of the valve 10 and the durability thereof can be improved under the condition that the valve body 13 is reliably guided along the axial direction of the valve stem.

In the practice of the present invention, when the upper guide member is attached to the flange portion of the valve box (the assembly flange portion 15D of the housing 15), an uneven surface (housing for forming the guide portion is formed on the inner surface of the valve box body. The durability can be further improved without forming 15 engaging recesses 100) at all.

Further, in the practice of the present invention, the operation member may be a handle or the like.

[Advantages of the Invention] As described above, according to the present invention, it is possible to improve the workability of the valve and the durability thereof while reliably guiding the valve body along the axial direction of the valve stem. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
A sectional view taken along the line II-II in the figure, FIG. 3 is an exploded view of FIG. 1,
4 is a sectional view taken along line IV-IV in FIG. 1, FIG. 5 is a sectional view schematically showing a lower guide portion, and FIG. 6 is a sectional view taken along line VI-VI in FIG. . 10 …… Valve, 11 …… Valve case, 12 …… Valve rod, 12A …… Intermediate flange, 12B …… Valve male thread, 13 …… Valve, 14 …… Cap (operating member), 15 ...... Housing (Valve box body), 15A ...... Fluid flow path, 15B ...... Valve chamber, 15D ...... Assembly flange part, 16 ...... Upper guide member, 21 ...... Female thread nut (female thread part), 22 ... … Valve chamber seal part, 23 …… Valve seat seal part, 24 …… Upper engagement part, 25 …… Lower engagement part, 26 …… Upper guide part, 27 …… Lower guide part.

Claims (1)

(57) [Claims] 1. A valve body which forms a fluid flow path and a valve chamber, and is connected to the valve body while rotating with respect to the valve body but not moving in the direction of its own axis. A valve stem having a threaded portion and a female threaded portion that is screwed to the male threaded portion of the valve stem, and is supported in a state in which it moves in the axial direction of the valve stem but does not rotate with respect to the valve casing. The valve chamber seal portion that is in close contact with the inner surface of the valve chamber that communicates with the fluid flow passage of Is fixed and drives the valve body through the valve stem,
A valve body guide structure for a valve, comprising a valve chamber seal portion and a valve seat seal portion of the valve body, and an operating member for contacting with and separating from the inner surface of the valve passage and the inner surface of the fluid passage. An upper engaging portion is provided on the upper side surface portion above the seal portion, and a lower engaging portion is provided on the lower side surface portion below the valve chamber seal portion of the valve body, and an upper inner surface that defines the valve chamber of the valve box. The upper guide member is detachably attached to the valve housing, the lower guide portion is provided on the inner surface that defines the fluid flow path of the valve box, and the inner diameter of the upper guide member is smaller than the outer diameter of the valve chamber seal portion. It is set to be larger than the outer diameter of the body, the valve body is supported only by the upper guide member when the valve body is fully opened, and the valve body is supported only by the lower guide portion when the valve body is fully closed. A valve body guide structure for a valve.