JP2003329150A - Resin butterfly valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin butterfly valve having an excellent long term operation durability, easy to switch from a manual system to an automatic system or vice versa, and firmly fixed to a top flange without a fitting base such as a locking plate being loosened when opening/closing a valve. <P>SOLUTION: In this resin butterfly valve wherein a valve body 3 is turned to open and close a bulb by the rotation of a stem 2, a stem presser 8 provided with a through hole 11 larger than the outer diameter of a stem reduced diameter part 6 and smaller than the outer diameter of a stem body part 5 at the center is fitted in a fitting recessed part 4 provided in an upper end part of a top flange 7 in a state that the stem reduced diameter part 6 is penetrated. A fitting base 9 is fixed to the top flange 7 with a fastening member 10 fixing both the fitting base 9 and the stem presser 8 in a state that the stem presser 8 is clamped with the top flange 7. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin butterfly valve suitable for use in piping lines in chemical plants, water and sewage systems, agriculture and fisheries industries, and more particularly, from a butterfly valve manual type to an automatic type. A resin type butterfly valve that can be easily switched to the formula or vice versa, and that the locking plate or the drive unit mounting base does not rattle even when the valve is opened and closed, and is firmly fixed to the top flange and has excellent long-term operation durability. It is a thing.

[0002]

2. Description of the Related Art As an example of a conventional butterfly valve, there is a resin butterfly valve in which a stem retainer 42 is inserted into a fitting recess 38 provided in an upper end portion of a top flange 41 as shown in FIGS. . The structure will be described with reference to the drawings. Reference numeral 35 is a valve main body, and a substantially disk-shaped top flange 41 is provided on the upper portion thereof.
A fitting recess 38 is provided at the upper end of the top flange 41, and a substantially cylindrical flow path 47 is provided at the center of the inside thereof.
An annular seat 46 is fitted on the inner peripheral surface of the device 7. Further, a bearing recess 48 is provided in the lower part. Reference numeral 36 denotes a stem, which includes a stem reduced diameter portion 40 and a stem body portion 39 having an outer diameter larger than the outer diameter of the stem reduced diameter portion 40,
The stem reduced diameter portion 40 projects from a through hole 45 of a stem retainer 42 described later and a through hole 49 of a locking plate 43 described later, and a handle 50 is fixed to the upper end portion by a bolt 51. Further, the stem body 39 is the valve body 35.
The second O-ring 68 is fitted to the lower part of the seat 46 and the seat 46, and the second O-ring 68 is fitted and sealed in the bearing recess 48 of the valve body 35. Reference numeral 42 denotes a stem retainer, which has a through hole 4 having a diameter larger than the outer diameter of the stem reduced diameter portion 40 and smaller than the outer diameter of the stem body 39 at the center.
5 are provided.

Reference numeral 43 denotes a locking plate which holds the stem retainer 42 together with the top flange 41, and is fixed to the top flange 41 by four screws 44 in a state where the upper end of the stem body 39 is pressed by the stem retainer 42. .
Reference numeral 37 denotes a substantially disc-shaped valve body, which is supported by the stem 36, and is rotated with the rotation of the stem 36, and the outer peripheral portion of the valve body 37 is pressed against and separated from the seat 46 of the valve body 35. Was to open and close the valve.

[0004]

However, in the resin butterfly valve having the above structure, as described above, the stem 36 is provided in the bearing recess 48 at the lower portion of the valve body 35.
Since the lower end of the valve is fitted and inserted in a sealed state, when the valve was assembled, the valve had to be assembled with air accumulated between the bearing recess 48 and the lower end of the stem 36. In this state, when switching the butterfly valve from the manual type to the automatic type, the locking plate 43 fixing the stem retainer 42 must be removed, and the automatic drive unit mounting base must be attached while pressing the stem retainer 42. It was That is, since the stem retainer 42 is in a free state, the pressure of air accumulated between the lower end portion of the stem 36 and the bearing recess 48 at the lower portion of the valve body 35 may push the stem 36 upward. This was the cause and it was difficult to fix the drive mount for the automatic system.

Further, due to the pressure of the air, the stem 36
Since an upward force is always applied to the stem presser,
The upward force was always applied to the screw 44 that fixes the mounting base such as the locking plate 43 that fixes the 2 while pressing it downwardly to the top flange 41. Further, the screw 44 is laterally loaded by the mounting base such as the locking plate 43 accompanying the opening and closing of the valve. Therefore, the locking plate fixing female screw portion 52 to which the screw 44 of the top flange 41 provided on the valve body 35 made of resin is screwed easily occurs,
When the valve is opened and closed, the mounting base such as the locking plate 43 rattles, which makes it difficult to operate the valve.

Further, in the resin butterfly valve having a structure in which the stem is split, the lower part of the upper stem is O.
The same problem occurred because it was sealed in the valve body by the ring.

The present invention has been made in view of the problems of the prior art as described above, and an object thereof is to easily switch a butterfly valve from a manual type to an automatic type or vice versa and at the time of opening / closing the valve. Also in the above, it is an object to provide a resin butterfly valve which is firmly fixed to the top flange without rattling of a mounting plate such as a locking plate and has excellent long-term operation durability.

[0008]

1 and 2, the present invention will be described. In the present invention, a stem narrowed portion 6 is provided in an upper portion of a valve body 1, and an upper end portion thereof is an upper portion of the valve body 1. A resin having a disc-shaped valve body 3 supported by a stem 2 arranged so as to project from a top flange 7 provided on the valve, and the valve body 3 is rotated by the rotation of the stem 2 to open and close the valve. In a butterfly valve made by a stem, a stem retainer 8 having a through hole 11 at the center, which is larger than the outer diameter of the stem reduced diameter portion 6 and smaller than the outer diameter of the stem body portion 5, is topped in a state where the stem reduced diameter portion 6 is penetrated. A fastening member 10 that is fitted and fixed in a fitting recess 4 provided at the upper end of the flange 7 and that fixes both the mounting base 9 and the stem pressing 8 with the mounting base 9 holding the stem pressing 8 together with the top flange 7. By Top Franc That is fixed to 7, the first feature.

The second feature of the present invention is that the stem retainer 8 is screwed and fixed to the fitting recess 4 provided at the upper end of the top flange 7, and the stem retainer 8 is provided at the upper end of the top flange 7. The fastening member 13 in the fitting recess 4 provided in the
The third feature is that the mounting base 9 is fixed by, and the fourth feature is that the mounting base 9 is the locking plate or the drive unit mounting base 12.

[0010]

Embodiments of the present invention will be described below with reference to the drawings, but it goes without saying that the present invention is not limited to the embodiments. FIG. 1 is a vertical cross-sectional view showing a closed state of a manual resin butterfly valve according to a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the main part of FIG. FIG. 3 is a perspective view of the stem retainer of FIG. Figure 4
FIG. 3 is a perspective view of the locking plate of FIG. 1. FIG. 5 is a partial vertical cross-sectional view when the stem is divided into two in FIG. FIG. 6 is a vertical sectional view showing a closed state of a manual resin butterfly valve according to the second embodiment of the present invention.
FIG. 7 is an enlarged cross-sectional view of the main part of FIG. FIG. 8 is a partial vertical cross-sectional view showing a closed state of an air-driven resin butterfly valve according to a third embodiment of the present invention. FIG. 9 is an enlarged cross-sectional view of the main part of FIG. FIG. 10 is a perspective view of the drive unit mount of FIG.

In the figure, reference numeral 1 is a PVC valve body, and a substantially disk-shaped top flange 7 protruding in the radial direction is provided on the upper portion thereof. At the upper end of the top flange 7, there is provided a fitting recess 4 having an internal thread portion 17 on its inner peripheral surface. A substantially cylindrical flow path 15 is provided in the center of the valve body 1, and an annular EPDM seat 14 is fitted to the inner peripheral surface of the flow path 15. A bearing recess 16 into which the lower end of the stem 2 described later is fitted is provided in the lower portion.

Reference numeral 2 denotes a stem made of SUS403, which comprises a stem body portion 5 and a stem reduced diameter portion 6 which is provided on the top and has an outer diameter smaller than the outer diameter of the stem body portion 5. An upper end portion of the stem reduced diameter portion 6 is arranged so as to project from the center of a top flange 7 provided on the upper portion of the valve body 1, and further, a through hole 11 of a stem retainer 8 described later and a through hole of a locking plate 9 described later. It is fixed to the handle 19 with bolts 20 in a state of penetrating 18. Further, the stem body portion 5 is passed through the valve body 1 and the seat 14 in a rotatable manner, and a first O-ring 21 is fitted above the stem body portion 5. Further, the lower end portion thereof is rotatably sealed by a second O-ring 22 and inserted in the bearing recess 16 by a test.

Reference numeral 8 is a substantially disc-shaped stem holder made of SUS304, which is provided with a circular through hole 11 at the center, which is larger than the outer diameter of the stem reduced diameter portion 6 and smaller than the outer diameter of the stem main body portion 5. Four screw holes 26 for fixing the top flange are provided concentrically around the periphery of 11. Further, a male screw portion 24 is provided on the outer peripheral surface (see FIG. 3). The stem retainer 8 is rotatably inserted into the upper end portion of the stem reduced diameter portion 6 arranged so as to project from the center of the top flange 7, and the top flange 23 is pressed downward on the upper end surface 23 of the stem body portion 5. It is screwed and fixed to a trial recess 4 provided at the upper end of 7. In this embodiment, the material of the stem retainer 8 is SUS304.
It is not particularly limited as long as it has no problem in strength and corrosion resistance such as metal such as PPG, synthetic resin such as PPG, etc. The stem retainer 8 and the through hole 11 have a circular shape, but they may interfere with assembly and operation. The shape does not matter. Also stem holder 8
The top flange fixing screw holes 26 are provided at four positions, but at least two positions may be provided.

Numeral 9 is a substantially disk-shaped locking plate made of PPG, which is provided with a circular through hole 18 at the center, and four top flange fixing holes 27 are concentrically formed around the through hole 18. It is provided. Further, a stopper portion 28 for adjusting the opening degree of the valve is provided on a part of the outer peripheral edge of the locking plate 9 (see FIG. 4). In the locking plate 9, the stem reduced diameter portion 6 penetrates through the through hole 18, and the screw 10 penetrates the top flange fixing hole 27 while the stem presser 8 is sandwiched with the top flange 7. The fixing screw hole 26 and the locking plate fixing female screw portion 25 of the experimental recess 4
It is fixed by being screwed on.

Reference numeral 3 denotes a substantially disc-shaped PP valve body, which is arranged in the center of the inside of the valve body 1 and is supported by a stem 2 which penetrates the center of the valve body 3 in a non-rotatable manner. The valve body 3 rotates within the valve body 1 as the stem 2 rotates, and the outer peripheral portion of the valve body 3 is pressed against and separated from the seat 14 to open and close the valve.

Next, the operation of this embodiment will be described.
In the state of FIG. 1, when the handle 19 is rotated leftward, the valve body 3 is rotated via the stem 2, the outer peripheral portion of the valve body 3 is separated from the seat 14, the flow path 15 is opened, and the valve is opened. It will be open. Further, when the handle 19 is rotated rightward in the open state, the valve body 3 is rotated via the stem 2, the outer peripheral portion of the valve body 3 is pressed against the seat 14, the flow passage 15 is blocked, and the valve is closed. It becomes a state. During this valve opening and closing operation,
Since the stem retainer 8 is screwed into the fitting recess 4 provided in the top flange 7 of the valve body 1, the stem 2 to which a force is applied upward is always pushed downward by the stem retainer 8. It is fixed. Therefore, there is no rattling of the mounting base such as the locking plate 9 and the valve can be operated smoothly over a long period of time.

Next, when the butterfly valve is switched from a manual type to an automatic type such as an air-driven type, which will be described later, the handle 19 is first removed from the stem 2 and the locking plate 9 is removed.
The drive unit mounting base 12 described later is fixed to the top flange 7 in a state in which is removed from the top flange 7, and the pneumatic actuator 32 described later is fixed to the drive unit mounting base 12 described later. At this time, since the stem 2 is fixed to the fitting recess 4 of the top flange while being pressed downward by the stem retainer 8, the stem 2 can be pushed upward even if the locking plate 9 is removed from the top flange 7. There is no Therefore, the butterfly valve can be easily switched from the manual type to the automatic type. Also, switching from the automatic type to the manual type can be easily performed by the same action.

Next, a second embodiment of the present invention will be described with reference to FIG.
And it demonstrates based on FIG. The difference from the first embodiment in FIG. 1 is that the method of fitting and fixing the stem retainer 31 to the fitting recess 29 provided at the upper end of the top flange 30 is not screwed but by four screws 13. It is a fixed point. The materials and structures of the other constituent members are the same as in the first embodiment, and the fixing method is also the same as in the first embodiment. Also, the operation is the same as that of the first embodiment.

Next, an air-driven resin butterfly valve according to a third embodiment of the present invention will be described with reference to FIGS. The difference from the first embodiment in FIG. 1 is that the locking plate 9 is a drive unit mounting base 12. As shown in FIG. 10, the drive unit mounting base 12 is made of PPG and has a substantially rectangular tube shape.
The stem reduced diameter portion 6 penetrates from 4 and the lower portion of the drive portion mounting base 12 is fixed to the top flange 7 by the bolt 10 in a state where the stem retainer 8 screwed to the top flange 7 is clamped together with the top flange 7. ing. Further, an air type actuator 32 is fixed by bolts 33 to the upper portion of the drive unit mount 12. The material of the drive unit mounting base 12 is preferably synthetic resin such as PPG, PVC, PP, PVDF, etc., but is not particularly limited as long as it has no problem in strength and corrosion resistance. The materials and structures of the other constituent members are the same as in the first embodiment, and the fixing method is also the same as in the first embodiment. Also, the operation is the same as that of the first embodiment.

[0020]

As described above, in the resin butterfly valve of the present invention, since the stem retainer is fixedly fixed in the coalescing concave portion provided in the top flange of the valve body, the butterfly valve can be manually operated. It is easy to switch to the automatic type and vice versa, and even when the valve is opened and closed, the locking plate or drive unit mounting base does not rattle, and it is firmly fixed to the top flange and has excellent long-term operation durability.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a closed state of a manual resin butterfly valve according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

3 is a perspective view of the stem retainer of FIG. 1. FIG.

FIG. 4 is a perspective view of the locking plate of FIG.

5 is a partial vertical cross-sectional view when the stem is divided into two in FIG.

FIG. 6 is a vertical cross-sectional view showing a closed state of a manual resin butterfly valve according to a second embodiment of the present invention.

FIG. 7 is an enlarged view of a main part of FIG.

FIG. 8 is a partial vertical cross-sectional view showing a closed state of an air-driven resin butterfly valve according to a third embodiment of the present invention.

9 is an enlarged view of a main part of FIG.

FIG. 10 is a perspective view of the drive unit mount of FIG.

FIG. 11 is a vertical cross-sectional view showing a closed state of a conventional resin butterfly valve.

FIG. 12 is an enlarged view of a main part of FIG.

[Explanation of symbols]

1 ... Valve body 2 ... Stem 3 ... Valve 4 ... trial recess 5 ... Stem body 6 ... Stem reduced diameter part 7 ... Top flange 8 ... Stem presser 9 ... Locking plate (mounting base) 10 ... Screw (fastening member) 11 ... Through hole 12: Drive unit mounting base 13 ... Screw (fastening member) 14 ... Shoot 15 ... Flow path 16 ... Bearing recess 17 ... Female thread 18 ... Through hole 19 ... Handle 20 ... bolts 21 ... First O-ring 22 ... Second O-ring 23 ... Upper end surface of stem body 24 ... Male thread 25 ... Female thread for locking plate fixing 26 ... Female thread for fixing top flange 27 ... Top flange national fixing hole 28 ... Stopper part 29 ... Fitting recess

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Claims (4)

[Claims] 1. A stem reduced diameter portion (6) is provided in an upper portion in a valve body (1), and an upper end portion thereof is arranged to project from a top flange (7) provided in an upper portion of the valve body (1). Has a disc-shaped valve body (3) supported by a stem (2) that is open, and the valve body (3) is rotated by the rotation of the stem (2).
A butterfly valve made of resin for rotating a valve to open and close the valve, a through hole (11) having a diameter larger than the outer diameter of the stem reduced diameter portion (6) and smaller than the outer diameter of the stem body portion (5) at the center.
The stem retainer (8) provided with is fitted and fixed to the fitting recess (4) provided at the upper end of the top flange (7) with the stem reduced diameter portion (6) penetrated, and the mounting base ( The top flange (7) is provided by a fastening member (10) that fixes both the mounting base (9) and the stem retainer (8) while the stem retainer (8) is sandwiched by the top flange (7).
Resin butterfly valve characterized by being fixed to. 2. The resin butterfly according to claim 1, wherein the stem retainer (8) is screwed and fixed to a fitting recess (4) provided at an upper end of the top flange (7). valve. 3. The stem retainer (8) is fixed by a fastening member (13) in a fitting recess (4) provided at the upper end of the top flange (7).
The resin butterfly valve described. 4. The resin butterfly valve according to claim 1, wherein the mount (9) is a locking plate or a drive mount (12).