JP2008190685A - Valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely realize the complete closing of a valve and easily confirm that state. <P>SOLUTION: This valve comprises a valve body, a valve element installed in the valve body rotatably around a rotating shaft, a stem 4 connected to the valve element coaxially with the rotating shaft, a gland 6 supported on the valve body and rotatably holding the stem 4, a cover member 7 secured to the stem 4, having a through hole extending parallel to the rotating shaft, and rotatable around the rotating shaft over the gland 6 when the stem 4 is rotated, and a first display member having a first display part 12 indicating that the valve element is fully closed and a bar-like part 13. The gland 6 has a first hole 9 so formed as to face the cover member 7. The first hole 9 is so formed as to accept the bar-like part 13 of the first display part through the through hole 14 only when the stem 4 is rotated so that the valve element is fully closed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a valve, and more particularly, to a display mechanism for the open / closed state of the valve.

  Generally, in a chemical factory or the like, raw materials, intermediate products, and products are transported via piping between devices and tanks that constitute a production line. The configuration and switching of the piping route is performed by opening and closing valves provided in the piping. The operation of the valve may be performed remotely, but is often performed manually.

  In order to configure and switch the piping route, it is desirable that the fluid flow can be controlled on and off. Ball valves have been conventionally used because of their low fluid resistance, high sealing performance, and simple opening and closing operations. The ball valve has a spherical valve body with a through hole, and the on / off control of the flow path rotates in a direction in which the central axis of the through hole is parallel or orthogonal to the flow path in the valve body. Is done by.

  In the ball valve, a stem connected to the valve body extends through the ground. The opening / closing operation of the valve is performed by engaging a lever-like handle with the tip of the stem, rotating the handle, and rotating the valve body through the stem. The handle is often removed after the operation to prevent erroneous operation. For this reason, a label with “open” or “closed” or the like may be hung so that the open / close state of the valve can be easily confirmed after the open / close operation is performed.

For easy confirmation, Patent Documents 1 and 2 disclose open / close display devices in which fixing members made of plate-like members and rotating members are alternately arranged radially. When the open / close display device is attached to the stem, only the rotating member rotates according to the rotation of the stem, the positional relationship of the rotating member with respect to the fixed member changes, and the open / closed state can be easily identified. Patent Document 3 discloses a valve opening / closing display device that is attached to the tip of a stem. This valve opening / closing display device is formed of a flat plate, the surface of which is partitioned by diagonal lines, and both sides are painted with, for example, red and white. The display device is attached to the stem by fitting a hole provided in the center of the flat plate into the tip of the stem. When the flat plate rotates according to the opening / closing of the valve, the angular position of each section changes, so that the open / closed state can be easily identified.
Japanese Utility Model Publication No. 55-170574 JP 2001-343087 A Japanese Utility Model Publication No. 6-14655

  In these conventional techniques, it is difficult to confirm that the valve is completely closed even though the open / closed state of the valve can be roughly checked. That is, in the technique of changing the state or angle (orientation) of the display device according to the rotation of the stem, the difference in the state or angle of the display device caused by the difference between the completely closed state and the slightly opened state is also minute. It is difficult to visually confirm the difference between the two. The method of placing a display tag has the same problem because the opening / closing operation and the operation of placing a display tag are not mechanically related to each other. However, a valve that controls the flow of fluid on and off requires high sealing performance depending on the application, and a slight leak, that is, a slight open state may not be allowed.

  An object of the present invention is to provide a valve that can reliably realize a completely closed state of the valve and can easily check the state.

  A valve according to an embodiment of the present invention includes a valve body, a valve body attached to the inside of the valve body so as to be rotatable about a rotation shaft, a stem coaxially connected to the rotation shaft, and a stem coupled to the valve body. A gland that is supported by the valve body and holds the stem rotatably, and a through-hole that is fixed to the stem and extends parallel to the rotation axis, can rotate around the rotation axis around the rotation axis as the stem rotates. A first display member including a cover member, a first display portion indicating that the valve body is in a fully closed position, and a rod-shaped portion. The gland has a first hole formed facing the cover member, and the first hole is only displayed when the stem is rotated so that the valve body is in the fully closed position. The rod-shaped portion is formed so as to be received through the through hole.

  Since the first display member cannot be attached unless the valve body is in the fully closed position, in order to attach the first display member, the operator must rotate the stem connected to the valve body to the fully closed position. Don't be. For this reason, the fully closed state of the valve is reliably achieved. In addition, the fact that the first display member is attached means that the valve is in the fully closed state. Therefore, by confirming that the first display member is attached, the valve is in the fully closed state. Can be easily confirmed.

  The first display portion may have an opening that engages with the top of the stem.

  The above-described valve has a second display member including a second display portion indicating that the valve body is in a fully open position, and a rod-shaped portion, and the ground is formed facing the cover member. The second hole has a second hole so that when the stem is rotated so that the valve body is in the fully open position, the rod-shaped portion of the second display portion is received through the through hole. Preferably it is formed. Furthermore, the second display portion may have an opening that engages with the top of the stem.

  A valve according to another embodiment of the present invention includes a valve body, a valve body attached to the inside of the valve body so as to be rotatable about a rotation axis, and a stem coaxially connected to the valve body and connected to the valve body. And a gland that is supported by the valve body and rotatably holds the stem, and a cover member that is fixed to the stem and that can rotate on the gland around the rotation axis as the stem rotates. The cover member exposes the first surface of the ground with the first color when the stem is rotated so that the valve body is in the fully closed position, and the stem is positioned so that the valve body is in the fully open position. A second surface of the ground with the second color is exposed when rotated.

  Also in this embodiment, the open / closed state of the valve can be easily identified by checking the surface state of the ground. Further, since the stem can be rotated while checking the surface state of the ground, the fully closed state of the valve can be realized with certainty.

  As described above, according to the present invention, it is possible to provide a valve that can reliably realize a completely closed state of the valve and can easily check the state.

  Next, a valve according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a ball valve according to a first embodiment of the present invention. FIG. 1 (a) shows a fully closed state of the valve, and FIG. 1 (b) shows a fully opened state of the valve. Yes. FIG. 2 is a top view of the ball valve shown in FIG. In the following description, a ball valve will be described as an example, but the present invention can be similarly applied to a cock valve and a butterfly valve.

  The valve 1 includes a valve body 2 configured to be flange-connected to an adjacent pipe 100, and a spherical valve body 3 attached to the inside of the valve body 2 so as to be rotatable around a rotation axis C1. Have. The stem 4 is connected to the valve body 3 coaxially with the rotation axis C1. The upper end of the stem 4 has a rectangular or hexagonal cross section, and can be engaged with an opening of a complementary shape provided in a handle (not shown). The handle 3 is attached to the stem 4 and the valve body 3 inside the valve body 2 is rotated by turning the handle. The valve body 3 is provided with a through hole 5, and the valve body 3 is turned on in the valve body 2 by rotating the central axis C <b> 2 of the through hole 5 in a direction parallel or orthogonal to the flow path 101. Off control is performed. In order to prevent malfunction, the handle is removed from the stem 4 after the valve 1 is opened and closed.

  Since the stem 4 needs to protrude outside the valve body 2 in order to operate the valve body 3, a gland 6 is provided at the upper portion of the valve body 2 as a sealing member at the protruding position so that the stem 4 can be rotated. keeping.

  Referring to FIG. 2, the cover member 7 is fixed to the stem 4. The cover member 7 has a function as a stopper that restricts the rotation range of the stem 4. That is, the cover member 7 can rotate above the ground 6 around the rotation axis C <b> 1 as the stem 4 rotates. On the other hand, the gland 6 is fixed to the valve body 2 by the ground bolt 15, and when the stem 4 rotates more than necessary, the cover member 7 contacts the ground bolt 15 and cannot be rotated any more. The cover member 7 includes a through hole 14 extending in parallel with the rotation axis C1.

  3A and 3B are external views of a first display member used together with the valve. FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a top view. The valve 1 further includes a first display member 11 having a flat plate-like first display portion 12 indicating that the valve body 3 is in the fully closed position and a rod-like portion 13. The first display member 11 can be removed and can be attached to the valve 1 when the valve 1 is in the fully closed state. However, it is not always necessary to attach the first display member 11, and it can be left unattached at the discretion of the operator.

  On the first display unit 12, a character “closed” is displayed. The “closed” character can be displayed, for example, in white on a red ground color or in red. Only the red ground color is acceptable. However, the display method is not limited to these, and any method that indicates that the valve 1 is in the fully closed state can be used. Although it is desirable that the characters and the ground color be applied to both surfaces of the first display unit 12, the back surface may be only the ground color or may not have the ground color. The magnitude | size and height of the 1st display part 12 are not specifically limited, It can determine with use conditions.

  4A and 4B are external views of a second display member used together with the valve. FIG. 4A is a front view, FIG. 4B is a side view, and FIG. 4C is a top view. The valve 1 further includes a second display member 21 including a flat plate-like second display portion 22 indicating that the valve body 3 is in a fully open position, and a rod-like portion 23. Similar to the first display member 11, the second display member 21 can be removed and attached to the valve 1 when the valve 1 is fully open. However, it is not always necessary to attach it, and it can be left at the operator's discretion.

  On the second display unit 22, characters “open” are displayed. The characters “open” can be displayed, for example, in white on a blue background or in blue. Only the blue ground color is acceptable. However, the display method is not limited to these, and any method that indicates that the valve is in a fully closed state can be used. Although it is desirable that the characters and the ground color be applied to both surfaces of the second display unit 22, the back surface may be only the ground color or may not have the ground color. The magnitude | size and height of the 2nd display part 22 are not specifically limited, It can determine with use conditions.

  FIG. 5 is a top view of the valve showing a situation when the first or second display member is attached. FIG. 4A is a view when the valve is in a fully closed state, and FIG. 4B is a view when the valve is in a fully open state. The ground 6 will be described in more detail with reference to FIGS.

  As shown in FIGS. 5A and 5B, the ground 6 has a first hole 9 and a second hole 10 formed so as to face the cover member 7. The first hole 9 and the second hole 10 are provided at a position equidistant from the rotation axis C1. The first hole 9 is formed so as to receive the rod-like portion 13 of the first display portion 11 through the through hole 14 only when the stem 4 is rotated so that the valve body 3 is in the fully closed position. Has been. The first hole 9 and the through hole 14 have a slightly larger cross-sectional dimension than the rod-shaped portion 13 so that the rod-shaped portion 13 is not erroneously received when the valve body 3 is in the slightly opened state. Or the cross section of the 1st hole 9 and the through-hole 14, and the cross section of the rod-shaped part 13 are formed in a comparable magnitude | size, and elasticity is given to the inner surface of the 1st hole 9 and the 2nd hole 10, and rod shape It is also possible to insert the portion 13 by pressing it firmly. FIG. 2 is a top view of the valve in the fully closed state. The first hole 9 and the through hole 14 have the same circular cross section and are drawn so as to completely overlap in the drawing. The shape of the first hole 9 and the through-hole 14 and the shape of the tip portion of the rod-like portion 13 can be any shape such as a circle, an ellipse, a rectangle, or a polygon. In the case of a circle, the mounting angle (orientation) in the plane orthogonal to the rotation axis C1 of the first display unit 11 is not restricted, and can be mounted at a free angle. In a case other than a circle, the mounting angle is limited, but since the orientation of the first display unit 12 is fixed in a fixed direction in the mounted state, the orientation of the first display unit 12 is used for checking the open / closed state. be able to.

  In the present embodiment, the opening 19 provided in the first display unit 11 and the opening 20 provided in the second display unit 21 (see also FIGS. 3 and 4) are engaged with the top of the stem 4. These display units 11 and 21 are supported. In this configuration, since the positional relationship of the first display unit 12 with respect to the opening 19 and the rod-shaped portion 13 and the positional relationship of the second display unit 22 with respect to the opening 20 and the rod-shaped portion 23 are different, the display differs from the open / closed state. There is no danger of attaching the display unit with That is, when the second display unit 21 is to be attached in the state of FIG. 5A, the flat plate-like second display unit 22 is 90 degrees with respect to the case where the first display unit 11 is correctly attached. It will be in a rotated state. 5B, when the first display unit 11 is attached, the flat plate-like first display unit 12 is 90 degrees as compared to the case where the second display unit 21 is correctly attached. It will be in a rotated state. Thereby, the reliability of the display of the open / closed state can be further enhanced.

  The second hole 10 is formed to receive the rod-like portion 23 of the second display portion 21 through the through hole 14 when the stem 4 is rotated so that the valve body 3 is in the fully open position. ing. The second hole 10 may receive the rod-like portion 23 not only when the valve body 3 is in the fully open state but also in a state close to the fully open state. That is, the second hole 10 may be formed slightly larger than the rod-like portion 23. Alternatively, the second hole 10 may be formed in the same size as the first hole 9, and the cross section of the rod-shaped portion 23 may be formed smaller than the cross section of the rod-shaped portion 13 of the first display unit 11. Such a configuration can be used when the fully closed state of the valve needs to be strictly realized, but the fully open state does not need to be realized as strictly as the fully closed state.

  In order to perform the opening / closing operation of the valve, as described above, a lever-like handle (not shown) is engaged with the tip of the stem 4 and the handle is rotated. As a result, the valve body 3 can be rotated via the stem 4. When the stem 4 rotates, the cover member 7 fixed to the stem 4 also rotates around the rotation axis C1. Since the cover member 7 is provided above the ground 6, it rotates while covering a part of the ground 6. In the fully closed position shown in FIG. 2, the cover member 7 is rotated to a position where the through hole 14 is aligned with the first hole 9 of the gland 6. At this time, as shown in FIG. 5 (a), when the rod-like portion 13 of the first display member 11 is inserted into the first hole 9 through the through hole 14, the position of the stem 4, that is, the valve by the cover member 7. The rotational position of the body 3 is fixed, and the valve 1 is locked in the fully closed state. At the same time, the first display unit 12 of the first display member 11 displays that the valve 1 is in the fully closed state, and the operator can confirm that the valve 1 is in the closed state. Further, as described above, since the rod-like portion 13 of the first display member 11 cannot be inserted unless the stem 4 is rotated to the position corresponding to the fully closed position of the valve 1, the first display portion 12 causes the valve 1 to be fully It can be confirmed that it is fixed in the closed position.

  In order to open the valve 1, the handle is turned in the opposite direction and the stem 4 is turned in the clockwise direction. As shown in FIG. 5B, in the fully open position, the cover member 7 is rotated to a position where the through hole 14 is aligned with the second hole 10 of the gland 6. At this time, when the rod-like portion 23 of the second display member 21 is inserted into the second hole 10 through the through hole 14, the position of the stem 4, that is, the rotational position of the valve body 3 is fixed by the cover member 7. Is locked fully open. Then, the operator can confirm that the valve 1 is in the fully opened state by the second display portion 22 of the second display member 21.

  As described above, in the present embodiment, the first display member 11 is used as a locking member in order to surely perform the full closing operation of the valve, and at the same time, the locking member has a display function of the fully closed state. I have it. For this reason, while fully realizing a fully closed state, a fully closed state can be confirmed reliably.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a top view of a valve according to the second embodiment of the present invention. 6 corresponds to FIG. 5, in which FIG. 6A is a view when the valve is in a fully closed state, and FIG. 6B is a view when the valve is in a fully open state. This embodiment may be used simultaneously with the first embodiment or may be used alone.

  The basic configuration of the valve is the same as that of the first embodiment. That is, the valve is supported by the valve body, the valve body attached to the inside of the valve body so as to be rotatable about the rotation shaft, the stem 4 coaxially connected to the rotation shaft, and the valve body. And a ground 6a for rotatably holding the stem, and a cover member 7a fixed to the stem 4 and capable of rotating on the ground 6a around the rotation axis as the stem 4 rotates. The cover member 7a has a function as a stopper that restricts the rotation range of the stem 4 as in the first embodiment.

  In the present embodiment, the cover member 7 exposes the first surface 16 of the gland 6a having the first color when the stem 4 is rotated so that the valve body is in the fully closed position. Is formed. Referring to FIG. 6A, the cover member 7a is rotated to a position where the through hole 14 provided through the surface thereof coincides with the first hole 9 of the ground 6a. At this position, the first surface 16 extending from the lower left to the upper right in the drawing is exposed on the surface of the ground 6a. The first surface 16 is provided with an indication that the valve is in a fully closed state. As an example, the first surface 16 is colored red or displayed in red with the word “closed”.

  The surface of the gland 6a is formed so that the second surface 17 of the gland 6a having the second color is exposed when the stem 4 is rotated so that the valve body is in the fully open position. Yes. Referring to FIG. 6B, the cover member 7a is rotated to a position where the through hole 14 coincides with the second hole 10 of the ground 6a. At this position, the second surface 17 extending from the lower right to the upper left in the drawing is exposed on the surface of the ground 6a. The second surface 17 is provided with an indication that the valve 1 is fully open. As an example, the second surface 17 is colored blue or “blue” is displayed in blue.

  The cover member 7a exposes the first surface 16 and completely covers the second surface 17 when the valve is fully closed. Further, the cover member 7a exposes the second surface 17 and completely covers the first surface 16 when the valve is fully opened. If the first surface 16 and the second surface 17 are formed in the same shape and the same dimensions as the cover member 7a, the first surface 16 and the second surface 17 are in an intermediate state other than the fully closed state or the fully open state. Each partially exposed. By utilizing this fact, the fully closed state and the fully open state of the valve can be visually confirmed. In this state, the rod-like member similar to that of the first embodiment is inserted into the first hole 9 or the second hole 10 through the through hole 14 to reliably realize the fully closed state and the fully open state. In addition, the fully closed state and the fully open state can be reliably confirmed.

It is a typical sectional view of a valve concerning a 1st embodiment of the present invention. It is a top view of the ball valve shown in FIG. It is an external view of the 1st display member used with a valve | bulb. It is an external view of the 2nd display member used with a valve | bulb. It is a top view of the valve | bulb which shows a condition when the 1st or 2nd display member is attached. It is a top view of the valve | bulb which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve 2 Valve body 3 Valve body 4 Stem 5 Through-hole 6, 6a Ground 7, 7a Cover member 9 1st hole 10 2nd hole 11 1st display member 12 1st display part 13 Rod-like part 14 Through-hole DESCRIPTION OF SYMBOLS 15 Ground bolt 16 1st surface 17 2nd surface 19,20 Opening part 21 2nd display member 22 2nd display part 23 Rod-like part 100 Piping C1 Rotating axis C2 Center axis

Claims (11)

A valve body;
A valve body attached to the inside of the valve body so as to be rotatable about a rotation axis;
A stem connected to the valve body coaxially with the rotating shaft;
A gland supported by the valve body and rotatably holding the stem;
A cover member that is fixed to the stem and includes a through-hole extending in parallel with the rotation shaft, and is rotatable around the rotation shaft and above the ground as the stem rotates;
A first display member including a first display portion indicating that the valve body is in a fully closed position, and a rod-shaped portion;
Have
The gland has a first hole formed facing the cover member, and the first hole is only when the stem is rotated so that the valve body is in a fully closed position. The valve | bulb currently formed so that the said rod-shaped part of a said 1st display part may be received through the said through-hole.   The valve of claim 1, wherein the first indicator has an opening that engages the top of the stem. A second display member including a second display portion indicating that the valve body is in a fully open position, and a rod-shaped portion;
The gland has a second hole formed facing the cover member, and the second hole is formed when the stem is rotated so that the valve body is in a fully open position. 3. The valve according to claim 1, wherein the valve is formed to receive the rod-shaped portion of the second display portion through the through hole.   The valve according to claim 3, wherein the second display portion has an opening that engages with a top portion of the stem.   The valve according to claim 3 or 4, wherein the first display portion is red and the second display portion is blue.   The first display portion is formed with white characters on a red or red background indicating a closed state, and the second display portion is formed with white characters on a blue or blue background indicating an open state. The valve according to claim 3 or 4.   The valve according to any one of claims 1 to 6, wherein the cover member is a stopper that regulates a rotation range of the stem. A valve body;
A valve body attached to the inside of the valve body so as to be rotatable about a rotation axis;
A stem connected to the valve body coaxially with the rotating shaft;
A gland supported by the valve body and rotatably holding the stem;
A cover member fixed to the stem and capable of rotating on the ground around the rotation axis as the stem rotates;
Have
The cover member exposes a first surface of the ground having a first color when the stem is rotated so that the valve body is in a fully closed position, and the valve body is in a fully open position. Formed to expose the second surface of the ground with a second color when the stem is rotated to be
valve.   9. The valve of claim 8, wherein the first color is red and the second color is blue.   The valve according to claim 8, wherein red characters indicating a closed state are formed on the first surface, and blue characters indicating an open state are formed on the second surface.   The valve according to claim 9 or 10, wherein the cover member is a stopper that regulates a rotation range of the stem.

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