JP2004278669A - Diaphragm valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extremely correctly and simply conduct opening/closing work at an intermediate opening. <P>SOLUTION: This diaphragm valve, of a manual operation type, is provided with a bonnet 10, and a handle 7 with a handle sleeve 8 of a tubular form covering a spindle protruded from the bonnet. It is also provided with a tubular member 14 provided to be axially movable to be abutted with the handle and/or the spindle, and a fixing means to fix the tubular member to the bonnet between the bonnet and the handle sleeve. The bonnet comprises a bonnet main body 11, and a bonnet sleeve 12 of a tubular form installed on the outside of the bonnet main body to be engaged with the inside of the tubular member. Female threads are cut in an inner circumferential surface of the tubular member, and male threads are cut in an outer circumferential surface of the bonnet. The tubular member is engaged with the bonnet. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a manually operated diaphragm valve, particularly to a manually operated diaphragm valve suitable for a biovalve used in a clean room.
[0002]
[Prior art]
In a conventional manually operated diaphragm valve, a spindle is screwed into a bonnet to push a compressor, and the compressor pushes the diaphragm to press the diaphragm against a valve seat. Thereby, the diaphragm valve closes. On the other hand, in a diaphragm valve in which a spindle is exposed to the outside from the upper part of the bonnet, lubricating oil such as grease, sliding powder, and the like may flow out of a small gap between the bonnet and the spindle, thereby contaminating the working environment. For this reason, for example, in a biovalve used in a clean room, a tubular handle sleeve for covering a spindle projecting from the bonnet is integrally attached to the handle.
[0003]
In addition, the conventional manually operated diaphragm valve opens and closes the diaphragm by screwing the spindle into the bonnet, and the only mechanism for holding the diaphragm in a predetermined position is a screw connection between the spindle and the bonnet. Then, the degree of opening of the diaphragm changes with time, and strict flow control is impossible. For this reason, as a mechanism for keeping the opening of the diaphragm constant for a long time, for example, a mechanism in which the thumb screw is screwed into the handle sleeve after adjusting the opening of the diaphragm and fixed to the bonnet, or between the handle and the bonnet (See, for example, Patent Literature).
[0004]
[Patent Document]
JP-A-2000-97368 (pages 3-5, FIG. 1-16)
[0005]
[Problems to be solved by the invention]
As described above, in the conventional manually operated diaphragm valve, a mechanism for holding the diaphragm in a predetermined position is to fix the handle sleeve with a thumb screw or to attach a separate locking device between the handle and the bonnet. Or something. Therefore, in any case, the purpose is only to hold the diaphragm at the opening after adjusting the opening of the diaphragm.
[0006]
On the other hand, the diaphragm valve needs not only to fully open or fully close the diaphragm but also to adjust the diaphragm to an intermediate opening degree. However, the above-mentioned conventional manually operated diaphragm valve does not have a stopper function for automatically stopping the screwing of the spindle at a preset intermediate opening when the spindle is screwed into the bonnet. For this reason, when closing the diaphragm to this intermediate opening, there is a problem that the screwing amount must be adjusted by eye measurement or the like. In addition, after adjusting the opening of the diaphragm, the handle must be fixed each time with a thumbscrew or the like, so that there is a problem that the opening and closing work takes time.
[0007]
The present invention has been made to solve such a problem, and in particular, it is not necessary to adjust the opening degree at each opening and closing at an intermediate opening degree and fix it with screws after the opening degree adjustment. An object of the present invention is to provide a diaphragm valve which can be easily operated.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a means adopted by the present invention includes a bonnet and a handle having a tubular handle sleeve that opens and closes a diaphragm through a spindle screwed into the bonnet and covers a spindle protruding from the bonnet. In the manually operated diaphragm valve provided, a tubular member interposed between the bonnet and the sleeve so as to be movable in the axial direction so as to be in contact with the spindle, and fixing means for fixing the tubular member to the bonnet; In addition.
[0009]
As described above, since the tubular member is movable in the axial direction between the bonnet and the sleeve and has the fixing means for fixing to the bonnet, it can be fixed to the bonnet at an arbitrary position in the axial direction. . Further, the tubular member comes into contact with the handle and / or the spindle when the handle is turned and the spindle is screwed into the bonnet, so that the spindle is not further screwed into the bonnet. In other words, the tubular member functions as a stopper at the intermediate opening, and at each opening and closing of the diaphragm, if the handle is turned to bring the handle and / or the spindle into contact with the tubular member, the diaphragm is closed to the preset intermediate opening. be able to.
[0010]
Further, by simply tightening the handle strongly, the handle can be securely fixed to the bonnet by the frictional force between the tubular member and the handle, and the tubular member functions as a lock after the opening is adjusted. Furthermore, if the tubular member is moved to the fully closed position of the diaphragm and fixed, the tubular member also functions as a stopper for preventing the diaphragm from being overtightened.
[0011]
The bonnet may include a bonnet body and a tubular bonnet sleeve attached to the outside of the bonnet body. By attaching a bonnet sleeve separate from the bonnet body to the outside of the bonnet body, the design of the tubular member becomes extremely easy regardless of various shapes and the like of the bonnet, and furthermore, such a tubular member is not provided. The conventional bonnet of the diaphragm valve can be used as it is.
[0012]
A female screw may be cut on the inner peripheral surface of the tubular member, and a male screw may be cut on the outer peripheral surface of the bonnet, and the tubular member may be screwed to the bonnet. Since the tubular member is screwed into the bonnet, adjustment of the tubular member to an intermediate opening degree, particularly fine adjustment, becomes extremely easy, and workability is improved.
[0013]
For example, the fixing means is a screw member which is screwed into the bonnet so as to be able to advance and retreat in the radial direction from the outside of the tubular member and to be able to abut on the bonnet.
[0014]
A marking indicating the setting position of the diaphragm opening can also be provided on the outer peripheral surface of the bonnet. By providing such a marking, the opening setting position of the diaphragm can be easily confirmed from the outside.In particular, in the diaphragm valve of the present invention in which the attachment of a separate locking device or the like is eliminated, the marking can be obtained from any angle. It is visible and the setting of the opening is further facilitated.
[0015]
A marking indicating the degree of opening of the diaphragm may be provided on the outer peripheral surface of the tubular member. With such a marking, the degree of opening of the diaphragm can be easily confirmed from the outside.In particular, in the case of the diaphragm valve of the present invention in which the attachment of a separate locking device or the like is eliminated, the marking can be viewed from any angle. In addition, adjustment of the opening degree is further facilitated.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a diaphragm valve according to the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, a diaphragm valve as an example includes a valve body 1, a diaphragm 2, a cushion rubber 3, a compressor 4, a thrust washer 5, a spindle 6, a handle 7, a bonnet 10, and the like. The valve element 1 has an opening 1a at an upper part, and an internal flow path is divided into two by a valve seat 1b. The diaphragm 2 is formed of an elastic material, and is fixed to the valve element 1 with a cushion rubber 3 interposed by a bonnet 10. The diaphragm 2 is attached to a spindle 6 with a compressor 4 and a thrust washer 5 interposed therebetween.
[0017]
The bonnet 10 includes a bonnet body 11 and a tubular bonnet sleeve 12. The bonnet sleeve 12 is attached to the outside of the bonnet body 11 by a set screw 13. The spindle 6 is screwed to the bonnet main body 11 and is rotatably supported by the shaft. A handle 7 is attached to the upper part of the spindle 6. When the handle 6 is turned and the spindle 6 is screwed into the bonnet main body 11, the compressor 4 is pushed downward, and the compressor 4 pushes the diaphragm 2 downward to press the diaphragm 2 against the valve seat 1b of the valve body 1. As a result, the diaphragm 2 is fully closed.
[0018]
An oil sump 11a is provided at an upper portion of the bonnet main body 11, and when lubricating oil such as grease leaks from a slight gap between the bonnet main body 11 and the spindle 6, the lubricating oil accumulates in the oil sump 11a. The handle 7 is integrally formed with a tubular handle sleeve 8 for covering the spindle 6 protruding from the bonnet body 11, and lubricating oil or sliding powder accumulated in the oil sump 11a flows out of the valve to reduce the external environment. Prevent contamination. A tubular stopper nut (tubular member) 14 is interposed between the bonnet sleeve 12 and the handle sleeve 8.
[0019]
A female screw is formed on the inner peripheral surface of the stopper nut 14, and a male screw is formed on the outer peripheral surface of the bonnet sleeve 12, and the stopper nut 14 is screwed with the bonnet sleeve 12. When the stopper nut 14 is rotated, it moves in the axial direction. A set screw (screw member) 15 is screwed into the bonnet sleeve 12 such that the set screw (screw member) 15 can advance and retreat in the radial direction from the outside of the stopper nut 14, and the tip of the set screw can contact the bonnet sleeve 12. The stopper nut 14 is fixed to the bonnet sleeve 12 by a set screw 15. When the spindle 6 is screwed into the bonnet body 11, the upper end of the stopper nut 14 contacts the handle 7.
[0020]
A color marking 14a extending in the axial direction is provided on the outer peripheral surface of the stopper nut 14. As shown in FIG. 2, the outer peripheral surface of the bonnet sleeve 12 is provided with an axially extending color marking 12a.
[0021]
Next, a method of operating the diaphragm valve will be described. The set screw 15 shown in FIG. 1 is loosened, the stopper nut 14 is rotated, and the stopper nut 14 is lowered to a predetermined lowest point. The predetermined lowermost point is set in advance from the viewpoint of preventing the diaphragm 2 from being overtightened. The stopper nut 14 is fixed to the bonnet sleeve 12 by tightening the set screw 15.
[0022]
At this time, the marking 12a of the bonnet sleeve 12 shown in FIG. 2 is flush with the lower end surface of the stopper nut 14, thereby confirming that the stopper nut 14 has been adjusted to the fully closed position of the diaphragm 2. . Further, the opening degree of the diaphragm 2 can be confirmed by the axial length h1 of the marking 14a of the stopper nut 14 exposed directly below the handle sleeve 8. The set screw 15 is loosened and the stopper nut 14 is rotated to raise the stopper nut 14 until the length of the marking 12a of the bonnet sleeve 12 becomes h2 as shown in FIG. The stopper nut 14 is fixed to the bonnet sleeve 12 by tightening the set screw 15. Thereby, the opening when closing the diaphragm 2 is set to the predetermined intermediate opening.
[0023]
The spindle 6 is screwed into the bonnet 10 by turning the handle 7. The handle 7 comes into contact with the upper end of the stopper nut 14, and the diaphragm 2 is closed to the above-described intermediate opening. Thus, the stopper nut 14 functions as a stopper when closing the diaphragm 2 to the intermediate opening. Further, simply by strongly tightening the handle 7, the handle 7 is securely fixed to the bonnet 10 by the frictional force between the handle 7 and the stopper nut 14. In other words, the stopper nut 14 also functions as a lock, and can hold the diaphragm 2 at the intermediate opening very easily without using a screw or the like.
[0024]
At this time, the marking 14a of the stopper nut 14 shown in FIG. 1 is flush with the lower end surface of the handle sleeve 8, thereby confirming that the diaphragm 2 has been closed to a predetermined intermediate opening. As described above, the opening setting position of the diaphragm 2 can be confirmed from the outside by the axial length of the marking 12a of the bonnet sleeve 12, and the opening setting of the diaphragm 2 can be easily performed. Further, the opening of the diaphragm 2 can be confirmed from the outside by the axial length of the marking 14a of the stopper nut 14, and the opening of the diaphragm 2 can be easily adjusted.
[0025]
By turning the handle 7 in the opposite direction, the diaphragm 2 can be moved in the opening direction. Then, the set screw 15 is loosened, the stopper nut 14 is rotated and raised, and the stopper nut 14 is brought into contact with the handle 7. Tighten the set screw 15. Thus, the diaphragm 2 can be held at the opening.
[0026]
As described above, in the present diaphragm valve, the stopper nut 14 functions not only as a stopper for preventing excessive tightening of the diaphragm 2 at the fully closed position, but also as a stopper and a lock at an intermediate opening. Therefore, each time the diaphragm 2 is opened and closed, simply turning the handle 7 until it comes into contact with the stopper nut 14 allows the diaphragm 2 to be closed very accurately and easily to a preset intermediate opening. Further, the holding of the diaphragm 2 at the intermediate opening can be easily performed without using a screw or the like.
[0027]
Since the stopper nut 14 is screwed into the bonnet main body 11, adjustment of the stopper nut 14 to an intermediate opening degree, particularly fine adjustment, becomes extremely easy, and workability is improved. Further, since the bonnet 10 is composed of the bonnet body 11 and the tubular bonnet sleeve 12 attached to the outside of the bonnet body 11, the design of the stopper nut 14 is extremely easy regardless of various shapes of the bonnet body 11. In addition, the bonnet of the conventional diaphragm valve without such a stopper nut can be used as it is. Further, since the diaphragm valve is not provided with a separate locking device or the like, the markings 12a and 14a can be viewed from any angle, and the setting of the opening and the adjustment of the opening can be further facilitated.
[0028]
Note that, as shown in FIG. 3, the stopper nut 24 may be directly screwed to the bonnet 20 and fixed with the set screw 25 (fixing member) without providing the bonnet sleeve. Further, a flange 24a may be formed below the stopper nut 24, and the handle sleeve 18 may be brought into contact with the flange 24a.
[0029]
The stopper nut does not necessarily need to be screwed into the bonnet sleeve. The stopper nut may be slidable in the axial direction with the bonnet sleeve, and may be simply fixed by fixing means such as a set screw. Further, the fixing means for fixing the stopper nut to the bonnet sleeve is not necessarily limited to the above-mentioned set screw. Marking on the outer peripheral surfaces of the bonnet sleeve and the stopper nut does not necessarily have to be performed. On the other hand, a marking such as a scale can be provided together with or instead of the above-described color marking. Further, instead of making the stopper nut abut on the handle, the stopper nut may be made to abut on a member considered as a part of the spindle, or on both such a member and the handle.
[0030]
【The invention's effect】
As described in detail above, the diaphragm valve of the present invention includes a bonnet and a handle having a tubular handle sleeve that opens and closes the diaphragm via a spindle screwed into the bonnet and covers a spindle protruding from the bonnet. A tubular member interposed between the sleeve and the sleeve so as to be movable in the axial direction so as to be in contact with the handle and / or the spindle, and a fixing means for fixing the tubular member to the bonnet. It is not necessary to adjust the opening degree at each opening and closing operation and to fix the opening degree with screws or the like after the opening degree adjustment, so that an excellent effect that the opening and closing work can be performed extremely accurately and easily can be achieved.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a diaphragm valve according to the present invention.
FIG. 2 is a front sectional view showing a diaphragm valve set to an intermediate opening.
FIG. 3 is a front sectional view showing another diaphragm valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve body 1a Opening 1b Valve seat 2 Diaphragm 3 Cushion rubber 4 Compressor 5 Thrust washer 6 Spindle 7 Handle 8 Handle sleeve 10 Bonnet 11 Bonnet body 11a Oil reservoir 12 Bonnet sleeve 12a Marking 13 Set screw 14 Stopper nut (tubular member)
14a Marking 15 Set screw (screw member)
18 Handle sleeve 20 Bonnet 24 Stopper nut (tubular member)
24a Flange 25 Set screw (screw member)
h1, h2 length

Claims (6)

A handle having a bonnet (10, 20) and a tubular handle sleeve (8, 18) for opening and closing the diaphragm (2) via a spindle (6) screwed into the bonnet and covering the spindle protruding from the bonnet; 7) a manually operated diaphragm valve comprising: a tubular member (14, 14) interposed between the bonnet and the handle sleeve so as to be movable in the axial direction so as to be in contact with the handle and / or the spindle. 24) and a fixing means for fixing the tubular member to the bonnet. The diaphragm valve according to claim 1, wherein the bonnet (10) comprises a bonnet body (11) and a tubular bonnet sleeve (12) mounted outside the bonnet body. A female screw is formed on an inner peripheral surface of the tubular member (14), and a male screw is formed on an outer peripheral surface of the bonnet (12, 20), and the tubular member is screwed to the bonnet. The diaphragm valve according to claim 1. The fixing means comprises a screw member (15, 25) screwed into the bonnet (12, 20) so as to be able to advance and retreat in the radial direction from the outside of the tubular member and to be in contact with the bonnet (12, 20). The diaphragm valve according to claim 1. The diaphragm valve according to any one of claims 1 to 4, wherein a marking (12a) for indicating an opening degree setting position of the diaphragm (2) is provided on an outer peripheral surface of the bonnet (12, 20). The diaphragm valve according to any one of claims 1 to 5, wherein a marking (14a) for indicating an opening degree of the diaphragm (2) is provided on an outer peripheral surface of the tubular member (14, 24).

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