JP2003185054A - Outside screw type gate valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outside screw type gate valve in which a valve open degree indicating device is installed and the height of the whole valve is minimized to the utmost. <P>SOLUTION: The valve is provided with an male screw part 8 on the upper end outer peripheral part of a spindle 6, and a hollow part 9 to which a valve open degree indicating body 22 is fitted with permitted vertical movement and unrotatably inside the upper part of the spindle 6. The lower part of the male screw part 8 is supported with permitted vertical movement in a shaft sealed condition at an central opening part of a cover body 12 and the male screw part 8 is screwed to the female screw part 18. In a valve open degree indicating part 26, the upper end surface of a sleeve 17 is engaged with the flange part 23 of the valve open degree indicating body 22 having a minor diameter male screw part 24 and a rod-shaped part 27 and a valve open degree indicating plate 25 is screwed to the minor diameter male screw part 24 with permitted vertical movement. The valve open degree indicating body 22 is unrotatably fixed to the upper end surface of the sleeve 17 and a handle 31 is unrotatably fixed to the upper end surface of a bonnet 15 in the upper part of the outer peripheral surface of the sleeve 17, so that the valve open degree indicating part 26 does not follow the rise of the spindle 6 even if the valve is in a fully open state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external screw type gate valve which is suitable for use in a pipeline for agricultural water, water and sewage, chemical plants, etc., and more specifically to an opening indicating device. The present invention relates to an externally threaded gate valve in which the overall height of the valve is reduced.

[0002]

2. Description of the Related Art Conventionally, an external screw type gate valve equipped with a general opening indicating device is disclosed in, for example, Japanese Patent Laid-Open No. 9-1893.
No. 74 publication. In the external screw type gate valve disclosed in the publication, a small diameter long bolt is fixed to the upper end of a screw shaft (spindle), and a disc-shaped pointer is fixed to the bolt by a nut. A screw shaft cover that covers the disk-shaped pointer is fixed to the handle, and a scale is attached to the screw cover in the longitudinal direction.

[0003]

However, the conventional externally threaded gate valve has the following problems. (1) Since the opening degree is confirmed within the range of the height of elevation accompanying opening and closing of the valve, the range becomes wider as the diameter of the valve increases, making it difficult to confirm the opening degree. (2) Since the opening gauge part is exposed to the upper part of the valve, there is a risk that the worker's clothes may be wrapped around during the work, or the equipment, tools, etc. may come into contact and cause unexpected damage. (3) The height of the entire valve increases as the diameter of the valve increases. The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide an externally threaded gate valve in which an opening degree indicating device is mounted and the height of the entire valve is made as small as possible. To do.

[0004]

The structure of the present invention will be described with reference to FIG. 1. A valve having an inlet passage 2 and an outlet passage 3 therein and extending perpendicularly to the axes of the both passages. Fixed to a valve body 1 having a chamber 4 and a lower end 7 of a spindle 6,
In an externally threaded gate valve having a valve body 5 that opens and closes both of the flow paths by advancing and retracting along the inner wall of the valve chamber 4, a male screw portion 8 is provided on the outer periphery of the upper end of the spindle 6.
However, in the upper part of the spindle 6, a hollow portion 9 into which an opening degree indicator 22 described later is fitted so as to be vertically movable and non-rotatable is provided.
And a lower portion 10 of the male screw portion 8 is provided on the upper end portion of the valve body 1 and is fixed to the bonnet 15.
2 is rotatably supported in the central opening 13 of the hood 2 in a shaft-sealed state, and the male screw portion 8 of the sleeve 17 is rotatably supported in the central opening 16 of the bonnet 15 above the lid 12. The sleeve 17 is screw-engaged with the female screw portion 18 provided on the inner peripheral surface, and the upper end surface of the sleeve 17 has an opening having a small-diameter male screw portion 24 and a rod-shaped portion 27 provided so as to project from the collar portion 23 located at the upper end portion. The opening indicating plate 25 is engaged with the collar portion 23 of the degree indicating body 22, and the opening indicating plate 25 is screwed to the small-diameter male screw portion 24 of the opening indicating body 22 so as to be vertically movable.
And the cap nut 28, which penetrates the small-diameter male screw portion 24 in a loosely fitted state,
The opening indicator 22 is fixed to the upper end surface of the sleeve 17 in a non-rotatable manner by being detachably fixed to the outer peripheral surface of the upper end of the handle 7, and the handle 31 is placed above the bonnet 15 above the outer peripheral surface of the sleeve 17. The first feature is that it is non-rotatably fixed to the end surface, and the second feature is that a transparent cover 32 that seals the opening degree indicating portion 26 is detachably fixed to the upper outer periphery of the cap nut 28. It is a feature of. A third feature is that the opening degree indicating plate 25 can be moved up and down by loosely fitting the opening degree indicating plate 25 to the support pin 33 provided so as to project from the upper end surface of the cap nut 28. Then, the concave notch 35 provided on the peripheral edge of the opening indicating plate 25 is engaged with the protrusion 36 provided in the axial direction of the inner peripheral surface of the cover 32, whereby the opening indicating plate 25
The fourth characteristic is that the can be moved up and down.

The material of the external screw type gate valve of the present invention is
It may be metal or plastic such as vinyl chloride resin and is not particularly limited.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings, but it goes without saying that the present invention is not limited to the embodiments. FIG. 1 is a longitudinal sectional view showing a closed state of a first embodiment of the present invention made of vinyl chloride resin. FIG. 2 is a longitudinal sectional view showing the same opened state. FIG. 3 is an enlarged vertical sectional view of a main part in FIG. FIG. 4 is an enlarged vertical sectional view of a main part in FIG. FIG. 5 is an exploded perspective view of a portion excluding the valve body, the valve body, and the lid body in FIG. 1. FIG. 6 is a perspective view of an essential part of a portion to which an opening degree indicating portion, to which a handle and a cover are not attached, is attached. FIG. 7 is a vertical sectional view showing a closed state of the second embodiment of the present invention. FIG. 8 is a cross-sectional view of the opening degree indicating device taken along the line AA of FIG. 7. FIG. 9 is an enlarged vertical sectional view of a main part of FIG. 8 in a valve open state.

In the figure, 1 is an inlet flow path 2 and an outlet flow path 3
And a valve chamber 4 which is provided so as to extend in a direction perpendicular to the axes of both the flow paths 2 and 3. Reference numeral 5 denotes a valve element which is fixed to a lower end portion 7 of a spindle 6 which will be described later and is arranged so as to be able to move forward and backward so as not to rotate along the inner wall of the valve chamber 4 as the spindle 6 moves up and down. Reference numeral 6 denotes a metal spindle, a lower end portion 7 of which is engaged and fixed to an upper end portion of the valve body 5, and a male screw portion 8 is provided at the upper end portion. A lower portion 10 of the male screw portion 8 is axially sealed by an O-ring 14 in a central opening 13 of a lid body 12 which is clamped and fixed to a bonnet 15 via an O-ring 11 on an upper end flange portion of the valve body 1, and It is supported so that it can move up and down. A hollow portion 9 having a semicircular cross section is provided inside the upper portion of the spindle 6 to a depth of about half the total length of the spindle 6.

Reference numeral 17 denotes a cylindrical sleeve rotatably supported in the central opening 16 of the bonnet 15, and a flange 19 provided at the lower end of the sleeve 12 and the upper end surface of the lid 12 via a thrust ring. Contact with or without.
A female screw portion is provided on the inner peripheral surface of the sleeve 17, and the sleeve 17 is screwed with the male screw portion 8 of the spindle 6.
The rotation of 7 serves to move the spindle 6 up and down. The upper end of the sleeve 17 has a diameter slightly smaller than that of the main body, and the outer peripheral surface thereof is continuously provided with a male screw portion 20 and a handle 31 fitting portion having a quadrangular planar shape from above. .

Reference numeral 22 denotes an opening degree indicator, which is provided at its upper end with a disc-shaped collar 23 having a small-diameter male screw portion 24 protruding from the center of its upper surface, and the lower surface of the collar 23. It is in contact with the upper end surface of the sleeve 17, and a rod-shaped portion 27 having a semicircular cross section having a diameter slightly larger than that of the male screw portion 24 having a small diameter is provided at the center thereof. The rod-shaped portion 27 is engaged with the hollow portion 9 of the spindle 6, and is adapted to move in and out of the hollow portion 9 in a non-rotatable state without accompanying the vertical movement of the spindle 6. The thread pitch of the small-diameter male screw portion 24 is approximately 1/3 of that of the male screw portion 8 of the spindle 6.
It is provided to the extent.

Reference numeral 25 denotes a small-diameter male screw portion 2 of the opening degree indicator 22.
4 is a circular opening degree indicator plate screwed to the position 4. 28 is screwed into the male thread portion 20 of the sleeve 17,
The handle 31 to the handle screwing portion 21 of the sleeve 17,
Further, it is a cap nut that fixes the flange portion 23 of the opening degree indicator 22 to the upper end surface of the sleeve 17 so as not to rotate together with the sleeve 17. An opening 30 is provided in the center of the upper surface of the cap nut 28, and a small-diameter male screw portion 24 of the opening degree indicator 22 is loosely fitted and protrudes. A support pin 33 is fixed to the peripheral portion of the upper surface by screwing or the like, and the support pin 33 is loosely fitted into an opening 34 provided in the peripheral portion of the opening degree indicating plate 25 and protrudes. The instruction pin 33 has a function of rotating the opening degree indicating plate 25 while rotating together with the rotation of the sleeve 17. Therefore, the small-diameter male screw portion 24 of the opening degree indicator 22, the opening degree indicating plate 25, and the support pin 33 of the cap nut 28 are connected to the opening degree indicating portion 26.
Are formed (see FIG. 6). The support pin 33 does not necessarily have to be provided, and the opening degree indicating plate 25 may be moved by manually rotating the opening indicating plate 25 to that position when the valve is opened or closed.

Reference numeral 32 is a cover made of transparent plastic (for example, polycarbonate) that protects the opening degree indicating portion 26, and is fixed to the male screw portion 29 provided on the outer peripheral portion of the upper end of the cap nut 28 by screwing. . Cover 32
Needless to say, if the marked line indicating the opening degree is provided on the circumferential side surface over the entire circumference, the opening degree can be easily confirmed.

Next, the operation of this embodiment will be described. When the handle 31 is rotated in the opening direction when the valve shown in FIGS. 1 and 3 is closed, the sleeve 17 is rotated.
Rotates along with the handle 31, and the male screw portion 8 of the spindle 6 screwed to the female screw portion 18 of the sleeve 17 rises inside the sleeve 17. That is, the spindle 6 moves upward. Accordingly, the opening degree indicator 2
The rod-shaped portion 27 of No. 2 enters into the hollow portion 9 of the spindle 6 without rotating, while the support pin 33 fixed to the peripheral portion of the upper surface of the cap nut 28 is attached to the handle 31 and attached to the cap nut 28. Also, it rotates together with the cover 32, and moves upward while rotating the opening degree indicating plate 25 screwed to the lowermost portion of the male screw portion 24 of the small diameter of the sleeve 17. When the handle 31 is further rotated in the opening direction, the valve is finally in the fully opened state, the male screw portion 8 of the spindle 6 reaches the upper end surface of the female screw portion 18 of the sleeve 17, and the rod-shaped portion 27 of the opening degree indicator 22. Is housed in the hollow portion 9 of the spindle 6, while the opening indicating plate 25 screwed into the small-diameter male screw portion 24 of the opening indicator 22 similarly reaches the upper end of the small-diameter male screw portion 24 ( 2 and 4). That is, even if the valve is in the fully opened state, the opening degree indicator 26 does not rise even if the spindle 6 rises, so that the height of the entire valve does not increase. Then, in the state of FIG. 2 and FIG.
When the handle 31 is rotated in the closing direction, the spindle 6 and the opening degree indicating plate 25 descend by the operation opposite to the above, and finally the valve closed state shown in FIGS. 1 and 3 is reached. .

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 shows a second embodiment in which the valve is closed. The difference from FIG. 1 is the structure of the opening degree instruction unit. That is, the opening indicator plate 25 that is screwed into the small-diameter male screw portion 24 of the opening indicator 22 is provided with two recessed notches 35 that face each other in the radial direction, while the cover is provided. The inner peripheral surface of 32 is provided with two ridges 36 that engage with the concave notches 35 of the opening degree indicating plate 25 in the axial direction (see FIG. 8).

Hereinafter, only the operation of the opening indicating portion will be described, and the other operations are the same as those in the first embodiment, and will be omitted.
Now, when the handle 31 is rotated in the opening direction in the state of FIG. 7, the opening degree indicating plate 25 screwed to the lowermost portion of the small diameter male screw portion 24 of the opening degree indicating body 22 is attached to the handle 31. Pivot with the cover 32, and the ridges 3 of the cover 32
While being guided by 6, it rises on the male screw portion 24 of the small diameter. When the handle 31 is further rotated, the valve is opened, and the opening degree indicating plate 25 moves to the small diameter male screw portion 2
4 to the upper end (state of FIG. 9). On the other hand, in the state of FIG. 9, when the handle 31 is rotated in the closing direction, the opening degree indicating plate 25 descends due to an operation opposite to the above,
At the end, the state shown in FIG. 7 is reached.

[0015]

By using the externally threaded gate valve of the present invention having the structure described above, the following excellent effects can be obtained. (1) Since the opening degree indicating device is formed compactly, the height of the entire valve can be reduced. Therefore, even if the diameter of the valve becomes large, the opening degree indicator does not come to a high position, so that the opening degree can be easily confirmed. (2) Since the opening degree indicating device is compact, it does not interfere with the operation even if it is provided above the handle. (3) Since the spindle does not project above the handle, it is possible to work without worrying about its vertical movement. (4) The valve damage caused by conventional equipment and tools is greatly reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a closed state of a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an open state in FIG.

FIG. 3 is an enlarged vertical sectional view of a main part in FIG.

FIG. 4 is an enlarged vertical sectional view of a main part in FIG.

5 is an exploded perspective view of a portion excluding a valve body, a valve body and a lid body in FIG. 1. FIG.

FIG. 6 is a perspective view of an essential part of a portion to which an opening degree indicating portion, to which a handle and a cover are not attached, is attached.

FIG. 7 is a vertical cross-sectional view showing a closed state of the second embodiment of the present invention.

8 is a cross-sectional view of the opening degree indicating device taken along the line AA in FIG.

9 is an enlarged vertical cross-sectional view of a main part of FIG. 8 in a valve open state.

[Explanation of symbols]

1 ... Valve body 2 ... Inlet channel 3 ... Exit flow path 4 ... valve chamber 5 ... Valve 6 ... Spindle 7 ... Lower end of spindle 8 ... Male thread of spindle 9 ... Hollow part of spindle 10 ... Lower part of spindle 11 ... O-ring 12 ... Lid 13 ... Central opening 14 ... O-ring 15 ... Bonnet 16 ... Central opening 17 ... Sleeve 18 ... Female thread of sleeve 19 ... Sleeve collar 20 ... Male thread of sleeve 21 ... Handle fitting part 22 ... Opening indicator 23 ... Collar part of opening indicator 24 ... Small diameter male thread 25 ... Opening indicator 26 ... Opening degree indicator 27 ... Rod-shaped part of opening indicator 28 ... Cap nut 29 ... Cap nut male thread 30 ... Cap nut opening 31 ... Handle 32 ... Cover 33 ... Support pin 34 ... Opening of opening indicating plate 35 ... Concave cutout portion of opening degree indicating plate 36 ... Cover ridge

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H053 AA25 BD01 DA02 DA12                 3H063 AA04 BB01 BB32 BB43 DA02                       DB03 EE07 EE15 EE17 GG06                       GG11                 3H065 AA03 BA01 BA05 BB04 BC01                       BC03 BC11

Claims (4)

[Claims] 1. An inlet channel (2) and an outlet channel (3) are provided inside.
And a valve chamber (4) extending perpendicularly to the axes of the two flow paths.
A valve body (1) having a valve body (1) and a lower end portion (7) of a spindle (6), and a valve body (5) that opens and closes both flow paths by advancing and retracting along an inner wall of a valve chamber (4). In an externally threaded gate valve comprising: a spindle (6), a male screw part (8) is provided on the outer periphery of the upper end, and a spindle (6).
A hollow portion (9) into which an opening degree indicator (22) described later is vertically movable and non-rotatably fitted is provided inside the upper part of each, and a lower portion (10) of the male screw portion (8) is Valve body (1)
It is movably supported in the central opening (13) of the lid (12) which is clamped and fixed to the bonnet (15) at the upper end of the shaft, and the male screw portion (8) is the lid. (1
Central opening (16) of bonnet (15) at the top of 2)
The sleeve (17) is rotatably supported on the inner peripheral surface of the sleeve (17), and the upper end surface of the sleeve (17) is engaged with the female screw portion (18). ) Is engaged with the flange portion (23) of the opening indicator (22) having the small-diameter male screw portion (24) and the rod-shaped portion (27), and the opening indicator (22 ), An opening degree indicating plate (25) is screwed to the small diameter male screw portion (24) so as to be movable up and down to form an opening degree indicating portion (26), and the small diameter male screw portion (24). The opening indicator (2) is detachably fixed to the outer periphery of the upper end of the sleeve (17) by a cap nut (28) which penetrates the sleeve in a loosely fitted state.
2) is non-rotatably fixed to the upper end surface of the sleeve (17), and the handle (31) is non-rotatably fixed to the upper end surface of the bonnet (15) above the outer peripheral surface of the sleeve (17). An externally threaded gate valve characterized by having 2. The transparent cover (32) for sealing the opening degree indicating portion (26) is detachably fixed to the outer periphery of the upper portion of the cap nut (28). External screw type gate valve. 3. An opening degree indicating plate (25) is attached to a support pin (33) provided so as to project from the upper end surface of the cap nut (28).
3. The externally threaded gate valve according to claim 1, wherein the opening degree indicating plate (25) is movable up and down by loosely fitting. 4. A recessed notch (35) provided on the peripheral edge of the opening indicating plate (25) is engaged with a ridge (36) provided in the axial direction of the inner peripheral surface of the cover (32). Therefore, the opening degree indicating plate (25) can be moved up and down, and the external screw type gate valve according to claim 1 or 2.