WO2019151499A1

WO2019151499A1 - Diaphragm valve

Info

Publication number: WO2019151499A1
Application number: PCT/JP2019/003701
Authority: WO
Inventors: 理彩子土田; 絢香齋藤
Original assignee: 積水化学工業株式会社
Priority date: 2018-02-01
Filing date: 2019-02-01
Publication date: 2019-08-08
Also published as: KR20200070366A; JPWO2019151499A1; TW201934913A; CN111656069A

Abstract

In a diaphragm valve (10), a valve main body (11) has an inlet-side flow channel (241), an outlet-side flow channel (242), a communication part (243), a first surface (31), a second surface (32), an inlet-side rib (51), and an outlet-side rib (52). The inlet-side flow channel (241) and the outlet-side flow channel (242) are in communication through the communication part (243). An opening (31a) facing the communication part (243) is formed in the first surface (31). The second surface (32) faces the first surface (31) with the inlet-side flow channel (241) and the outlet-side flow channel (242) therebetween. The inlet-side rib (51) is provided in the second surface (32), and is formed along the inlet-side flow channel (241). The outlet-side rib (52) is provided in the second surface (32), and is formed along the outlet-side flow channel (242). A recessed part (51a) is formed in the inlet-side rib (51). A recessed part (52a) is formed in the outlet-side rib (52).

Description

Diaphragm valve

The present invention relates to a diaphragm valve.

A diaphragm valve is provided in a piping line in a plant such as water treatment, chemistry, and food, and the fluid flowing through the piping is controlled by the diaphragm valve (see, for example, Patent Document 1).

In such a diaphragm valve, piping is connected to both ends and installed in the plant. In the diaphragm valve, the flow path is closed when the diaphragm is pressed against the partition wall, and the flow path is opened when the diaphragm is separated from the partition wall.

JP 2007-278308 A

However, since pipes are connected to both ends of the diaphragm valve, an external force such as a tensile force by the pipe is applied to the diaphragm valve, and long-term durability performance may be reduced.

An object of the present invention is to provide a diaphragm valve with improved long-term durability performance.

(Means for solving the problem)
In order to achieve the above object, a diaphragm valve according to a first invention includes a valve body, a diaphragm, a bonnet, and a drive mechanism. The valve body includes an inlet-side channel, an outlet-side channel, a communication portion, a first surface, a second surface, an inlet-side rib, and an outlet-side rib. The communication part communicates the inlet side channel and the outlet side channel. The first surface has an opening facing the communicating portion. The second surface faces the first surface across the inlet-side flow path and the outlet-side flow path. The inlet side rib is provided on the second surface and is formed along the inlet side flow path. The outlet side rib is provided on the second surface and is formed along the outlet side flow path. The diaphragm is disposed on the first surface so as to close the opening. The bonnet is fixed to the valve body so as to cover the diaphragm. The drive mechanism drives the diaphragm so as to close or open the communication portion. A recess is formed in at least one of the inlet side rib and the outlet side rib.

As described above, by forming the recess in the rib formed along the flow path, the stress generated in the valve body can be dispersed even when an external force is applied to the diaphragm valve.

That is, the effect of reinforcing the valve body is provided by providing the rib, but stress may be concentrated in the vicinity of the rib. Therefore, the stress can be dispersed by forming the recess as described above. .

The diaphragm valve according to the second invention is the diaphragm valve according to the first invention, and the first inclined end portion and the second inclined end portion are formed in the recess. The first inclined end portion is inclined so as to approach the first surface toward the second inclined end portion side, and the second inclined end portion is inclined so as to approach the first surface toward the first inclined end portion side. The angle formed between the first inclined end portion and the second inclined end portion is not less than 110 degrees and not more than 170 degrees.

As described above, the angle formed between the first inclined end portion and the second inclined end portion is 110 degrees or more and 170 degrees or less, so that even when an external force is applied to the diaphragm valve, The resulting stress can be dispersed.

By providing the rib, the effect of reinforcing the valve body is exerted. However, stress may be concentrated in the vicinity of the rib. Therefore, by forming the first inclined end portion and the second inclined end portion as described above, the stress is Can be distributed.

Therefore, the long-term durability performance of the diaphragm valve can be improved.
A diaphragm valve according to a third aspect of the present invention is the diaphragm valve according to the first or second aspect of the present invention, wherein the recess is provided in both the inlet side rib and the outlet side rib.

This makes it possible to distribute the stress over the entire flow path of the valve body of the diaphragm valve.

A diaphragm valve according to a fourth aspect of the present invention is the diaphragm valve according to the first or second aspect, wherein the first inclined end portion and the second inclined end portion are continuously connected by a curved end portion.

Thereby, the effect of dispersing the stress can be exhibited.
A diaphragm valve according to a fifth aspect of the present invention is the diaphragm valve according to any one of the first to fourth aspects, wherein the drive mechanism has a stem, a compressor, and a drive unit. The stem is supported by the bonnet. The compressor is attached to the stem and is connected to the diaphragm. The drive unit drives the stem. The drive unit is a manual type, an air drive type, or an electric drive type.

¡Thus, the stem can be driven manually, by air or electricity, and the flow path is closed or opened.

(Effect of the invention)
According to the present invention, it is possible to provide a diaphragm valve with improved long-term durability performance.

The perspective view of the diaphragm valve of embodiment concerning this invention. The fragmentary sectional view of the diaphragm valve of FIG. The perspective view which looked at the valve main body of FIG. 1 from upper direction. The perspective view which looked at the valve main body of FIG. 1 from the downward direction. The front view of the valve main body of FIG. The bottom view of the valve main body of FIG. FIG. 7 is a cross-sectional view taken along the line AA ′ in FIG. 6. (A) S part enlarged view of FIG. 7, (b) T part enlarged view of FIG. (A) The schematic cross section which shows the state where the flow path was closed, (b) The schematic cross section which shows the state where the flow path was open | released. (A)-(c) The cross-sectional block diagram for demonstrating the stress which arises in an Example. The figure which shows the table | surface of the determination result of an Example.

Hereinafter, a diaphragm valve according to an embodiment of the present invention will be described with reference to the drawings.

<1. Configuration>
FIG. 1 is an external perspective view of a diaphragm valve 10 according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional configuration diagram of the diaphragm valve 10 of the present embodiment.

As shown in FIGS. 1 and 2, the diaphragm valve 10 of the present embodiment includes a valve body 11, a diaphragm 12, a bonnet 13, and a drive mechanism 14. Pipes are connected to both ends of the valve body 11, and a flow path 24 through which a fluid flows is formed in the valve body 11. The diaphragm 12 opens or blocks the flow path 24. The bonnet 13 is attached to the valve body 11 so as to cover the diaphragm 12. A part of the driving mechanism 14 is disposed in the hood 13 and drives the diaphragm 12.

(Valve body 11)
FIG. 3 is a perspective view of the valve body 11 as viewed from the first surface 31 side to be described later. FIG. 4 is a perspective view of the valve body 11 as viewed from the second surface 32 side described later. FIG. 5 is a front view of the valve body 11, and FIG. 6 is a bottom view of the valve body 11. FIG. 7 is a cross-sectional view taken along the line AA ′ in FIG.

The valve body 11 is made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), or PVCF (polyvinylidene fluoride), polystyrene, ABS resin, polytetrafluoroethylene, perfluoroalkyl vinyl ether copolymer. It can be formed of a resin such as polychlorotrifluoroethylene, or a metal such as iron, copper, copper alloy, brass, aluminum, stainless steel, or porcelain.

As shown in FIG. 3, the valve body 11 has a first end portion 21, a second end portion 22, a central portion 23, and a flow path 24.

The first end portion 21, the second end portion 22, and the central portion 23 are integrally formed. As shown in FIG. 7, the flow path 24 includes the first end portion 21, the central portion 23, and the second end portion. It is formed over the portion 22.

(First end 21, second end 22)
As shown in FIGS. 3 and 4, the first end portion 21 and the second end portion 22 are disposed so as to sandwich the central portion 23, and are connected to the central portion 23.

As shown in FIG. 3, the first end portion 21 includes a first flange portion 211 to which a pipe is connected, and a first connection portion 212 that connects the first flange portion 211 and the central portion 23. As shown in FIG. 4, the first flange portion 211 has a first flange surface 213 in which an inlet 24 a through which fluid flows into the valve body 11 is formed, and pipes can be connected thereto.

Further, as shown in FIG. 4, the second end portion 22 includes a second flange portion 221 to which a pipe is connected, and a second connection portion 222 that connects the second flange portion 221 and the central portion 23. As shown in FIG. 3, the second flange portion 221 has a second flange surface 223 in which an outlet 24 b through which fluid is discharged from the valve body 11 is formed, and pipes can be connected thereto.

The first flange portion 211 and the second flange portion 221 are arranged to face each other as shown in FIGS. 3 and 4, and the first flange surface 213 and the second flange surface 223 are mutually connected as shown in FIG. It is formed so as to face each other in parallel. The position of the inlet 24a and the position of the outlet 24b are also opposed.

(Central part 23, flow path 24)
As shown in FIG. 5, the center portion 23 is provided between the first end portion 21 and the second end portion 22. The central portion 23 includes a first surface 31, a second surface 32, a wall portion 33 (see FIG. 7), and a rib 34.

As shown in FIG. 3, the first surface 31 has a substantially planar shape and is formed perpendicular to the first flange surface 213 and the second flange surface 223. An opening 31 a is formed at the center of the first surface 31. The opening 31a is formed with a curved periphery. A direction along a line connecting the inlet 24a to the outlet 24b is defined as a first direction X, and a direction perpendicular to the first direction X and parallel to the first surface 31 is defined as a second direction Y. The first direction X can also be said to be a direction along a straight line perpendicular to the first flange surface 213 and the second flange surface 223.

As shown in FIG. 5, the second surface 32 is a surface facing the first surface 31 with the flow path 24 interposed therebetween. The second surface 32 is formed along the shape of the flow path 24. The 2nd surface 32 is a surface on the opposite side to the side by which the bonnet 13 of the center part 23 is arrange | positioned.

As shown in FIG. 7, the channel 24 is formed from the inlet 24 a to the outlet 24 b, and the wall 33 is formed to protrude toward the first surface 31 at the center of the channel 24. The wall 33 is formed such that the inner surface of the channel 24 gently rises toward the first surface 31 so as to form an inclination in the channel 24. The above-described opening 31 a is formed at a position corresponding to the wall portion 33. A diaphragm 12 to be described later is in pressure contact with the tip 33a of the wall 33 on the first surface 31 side.

The channel 24 includes an inlet-side channel 241 formed from the inlet 24 a of the first end 21 to the wall 33, and an outlet-side channel formed from the outlet 24 b of the second end 22 to the wall 33. 242 and a communication portion 243 that communicates the inlet-side channel 241 and the outlet-side channel 242.

As shown in FIG. 7, the inlet-side flow path 241 is narrower in width in the direction perpendicular to the first surface 31 toward the wall portion 33. On the other hand, the width of the inlet-side channel 241 in the direction parallel to the first surface 31 (the direction perpendicular to the paper surface in FIG. 7) becomes wider toward the wall 33.

The outlet side flow path 242 is formed from the outlet 24b of the second flange portion 221 to the wall portion 33. As shown in FIG. 7, the outlet-side flow path 242 becomes narrower in width in the direction perpendicular to the first surface 31 toward the wall portion 33. On the other hand, the width of the outlet-side flow path 242 in the direction parallel to the first surface 31 (the direction perpendicular to the paper surface in FIG. 7) becomes wider toward the wall portion 33.

The communication part 243 is a part of the flow path 24 on the first surface 31 side of the wall 33, and communicates the inlet-side flow path 241 and the outlet-side flow path 242.

As shown in FIG. 4, the second surface 32 has an inlet-side curved portion 321 along the inlet-side flow channel 241 and an outlet-side curved portion 322 along the outlet-side flow channel 242. A projection toward the first surface 31 side of the wall 33 shown in FIG. 7 is formed by the outlet side curved portion 321 and the outlet side curved portion 322.

(Rib 34)
As shown in FIGS. 4 and 6, the rib 34 is formed to protrude from the second surface 32 perpendicular to the first surface 31. The rib 34 has a first rib 41 and a second rib 42.

4 and 6, the first rib 41 is formed along the first direction X from the inlet side curved portion 321 to the outlet side curved portion 322 in the second surface 32. The first rib 41 is provided at the center in the second direction Y of the central portion 23.

The second rib 42 is formed along the second direction Y, and is provided at the center of the central portion 23 in the first direction X.

Further, an outer edge portion 35 is formed from each of both ends of the first surface 31 in the second direction Y toward the second surface 32 side, and the second rib 42 is formed from one outer edge portion 35 to the other outer edge portion 35. Is formed.

The first rib 41 and the second rib 42 cross in a cross shape in a plan view as shown in FIG. As shown in FIG. 4, a bolt hole 43 a is formed in the central portion 43 toward the first surface 31.

The first rib 41 has an inlet-side rib 51 provided on the inlet 24a side with respect to the central portion 43, and an outlet-side rib 52 provided on the outlet 24b side with respect to the central portion 43.

The inlet side rib 51 is provided along the inlet side flow path 241. It can be said that the inlet-side rib 51 is formed along a direction perpendicular to the first flange surface 213 and the second flange surface 223.

As shown in FIGS. 4 and 7, a recess 51 a is formed in the inlet side rib 51. The recess 51a relieves stress caused by external force. FIG. 8A is an enlarged view of the S part in FIG. As shown in FIG. 8A, the inlet-side rib 51 includes a first inclined end portion 511, a second inclined end portion 512, a first inclined end portion 511, and a second inclined end portion 512 in the recess 51a. And a curved end 513 that connects the two. The first inclined end portion 511 and the second inclined end portion 512 are formed in a straight line when viewed along the second direction Y.

The first inclined end 511, the curved end 513, and the second inclined end 512 are arranged in this order from the central portion 43 toward the first end 21.

The first inclined end portion 511 is inclined so as to approach the first surface 31 from the central portion 43 toward the first end portion 21 side. The second inclined end portion 512 is inclined so as to move away from the first surface 31 from the central portion 43 side toward the first end portion 21 side.

Further, the first inclined end portion 511 is inclined so as to approach the first surface 31 toward the second inclined end portion 512 side, and the second inclined end portion 512 is the first inclined toward the first inclined end portion 511 side. It can also be said that it is inclined so as to approach one surface 31.

The curved end portion 513 continuously connects the first inclined end portion 511 and the second inclined end portion 512 without any step.

As shown in FIG. 8A, the angle θ1 formed by the straight line L1 along the first inclined end portion 511 and the straight line M1 along the second inclined end portion 512 in the front view is 110 degrees or more and 170 degrees. It is set as follows.

The outlet-side rib 52 is provided on the second surface 22 side of the central portion 43 and on the second surface 32 along the outlet-side flow path 242. It can be said that the outlet side rib 52 is formed along a direction perpendicular to the first flange surface 213 and the second flange surface 223.

As shown in FIGS. 4 and 7, the exit-side rib 52 has a recess 52 a. The recess 52a relieves stress caused by external force. FIG. 8B is an enlarged view of a T portion in FIG. The outlet rib 52 has a first inclined end 521, a second inclined end 522, and a curved end 523 connecting the first inclined end 521 and the second inclined end 522 in the recess 52a. Have. The first inclined end portion 521 and the second inclined end portion 522 are formed in a linear shape when viewed along the second direction Y (front view).

The first inclined end 521, the curved end 523, and the second inclined end 522 are arranged from the central portion 43 toward the second end 22 in this order.

The first inclined end portion 521 is inclined so as to approach the first surface 31 from the central portion 43 toward the second end portion 22 side. The second inclined end portion 522 is inclined so as to move away from the first surface 31 from the central portion 43 side toward the second end portion 22 side.

The first inclined end portion 521 is inclined so as to approach the first surface 31 toward the second inclined end portion 522 side, and the second inclined end portion 522 is the first inclined toward the first inclined end portion 521 side. It can also be said that it is inclined so as to approach one surface 31.

As shown in FIG. 8B, the angle θ2 formed by the straight line L2 along the first inclined end 521 and the straight line M2 along the second inclined end 522 in the front view is 110 degrees or more and 170 degrees. It is set as follows.

(Diaphragm 12)
The material of the diaphragm 12 should just be a rubber-like elastic body, and is not specifically limited. For example, ethylene propylene rubber, isoprene rubber, chloroprene rubber, chlorosulfonated rubber, nitrile rubber, styrene butadiene rubber, chlorinated polyethylene, fluoro rubber, EPDM (ethylene propylene diene rubber), PTFE (polytetrafluoroethylene), etc. are suitable. Material.

Also, a strong reinforcing cloth may be inserted into the diaphragm 12. The reinforcing cloth is preferably made of nylon. This is preferable because it is possible to prevent the diaphragm 12 from being deformed or damaged when fluid pressure is applied to the diaphragm 12 when the diaphragm valve is closed.

The diaphragm 12 is disposed on the first surface 31 so as to close the opening 31a as shown in FIG. An outer peripheral edge 121 of the diaphragm 12 is sandwiched between a bonnet 13 and a valve body 11 which will be described later.

The diaphragm 12 is moved downward by a driving mechanism 14 described later and comes into contact with the tip 33a of the wall 33, thereby closing the communication portion 243 and closing the flow path 24. Further, the diaphragm 12 is moved upward by the drive mechanism 14 and the diaphragm 12 is separated from the tip end portion 33a, whereby the flow path 24 is opened.

(Bonnet 13)
As with the valve body 11, the bonnet 13 is made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), or PVCF (polyvinylidene fluoride), polystyrene, ABS resin, polytetrafluoroethylene, par It can be formed of a resin such as a fluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene, or a metal such as iron, copper, copper alloy, brass, aluminum, stainless steel, or porcelain.

As shown in FIGS. 1 and 2, the bonnet 13 is fixed to the first surface 31 of the valve body 11 with bolts 100 or the like. The bonnet 13 is provided so as to cover the opening 31 a via the diaphragm 12.

That is, the bonnet 13 has an opening 13a corresponding to the first surface 31, and has a through-hole 13b in which a sleeve 62 and a stem 63 described later are arranged at a position facing the opening 13a.

(Drive mechanism 14)
The drive mechanism 14 includes a compressor 61, a sleeve 62, a stem 63, and a handle 64.

The compressor 61 is made of PVDF (polyvinylidene fluoride) or the like and is connected to the diaphragm 12. An engagement member 65 is embedded in the diaphragm 12, and the engagement member 65 protrudes on the opposite side (non-wetted surface side) of the valve body 11. The protruding portion of the engaging member 65 is engaged with the compressor 61, and the compressor 61 and the diaphragm 12 are connected.

The sleeve 62 is supported by the through hole 13b of the bonnet 13. A screw shape is formed inside the sleeve 62.

The stem 63 is disposed on the inner side of the sleeve 62 and is screwed with a screw shape formed on the inner side of the sleeve 62. A compressor 61 is fixed to an end of the stem 63 that is disposed inside the bonnet 13. The compressor 61 is engaged with the diaphragm 12 on the valve body 11 side, and is fixed to the stem 63 on the side opposite to the valve body 11.

The handle 64 is fitted to the outer periphery of the portion of the stem 63 located outside the bonnet 13.

<2. Operation>
Next, the operation of the diaphragm valve 10 of the present embodiment will be described. FIG. 9A and FIG. 9B are diagrams schematically showing the operation of the diaphragm 12.

When the handle 64 is rotated in a direction in which the flow path 24 is closed from the state where the flow path 24 is opened as shown in FIG. 9A, the stem 63 descends according to the rotation of the handle 64 (see FIG. 2). . As the stem 63 is lowered, the compressor 61 fixed to the end of the stem 63 is also lowered.

As the compressor 61 descends, the diaphragm 12 is convexly curved toward the second surface 32 as shown in FIG. 9B, and is pressed against the tip 33 a of the wall 33.

As a result, the flow path 24 of the diaphragm valve 10 is blocked.
On the other hand, when the handle 64 is rotated in the opening direction, the stem 63 rises as the handle 64 rotates. As the stem 63 rises, the compressor 61 also rises, and the central portion of the diaphragm 12 engaged with the compressor 61 rises as shown in FIG.

As a result, the flow path 24 of the diaphragm valve 10 is opened.
<3. Example>
The stress generated in the valve body 11 when θ1 and θ2 were changed to 100 °, 110 °, 140 °, and 170 ° and 180 ° were analyzed, and the determination was made in three states.

As the first state, the stress generated in the valve body 11 when the diaphragm 12 was pressed against the wall 33 was determined. As the second state, the stress generated in the valve body 11 due to the dead weight of the diaphragm valve 10 was determined. As the third state, the stress generated in the valve body 11 when the first flange portion 211 and the second flange portion 221 were pulled by the piping was determined.

FIG. 10A is a diagram showing the stress applied to the valve body 11 in the first state. The force when pressing the diaphragm 12 against the wall 33 is indicated by F1. F1 causes an inward stress F2 in the first direction X on the first surface 31 side of the valve body 11, and an outward stress F3 occurs in the inlet-side rib 51 and the outlet-side rib 52.

FIG. 10B is a diagram showing the stress applied to the valve body 11 in the second state. A force applied to the valve main body 11 when the bolt is inserted into the bolt hole 43a of the central portion 43 and the valve main body 11 is fixed at a predetermined position is indicated by F1. F1 causes an outward stress F2 in the first direction X on the first surface 31 side of the valve body 11, and an inward stress F3 occurs on the inlet-side rib 51 and the outlet-side rib 52.

FIG. 10 (c) is a diagram showing the stress applied to the valve body 11 in the third state. The force with which the first flange portion 211 and the second flange portion 221 are pulled by the pipe is indicated by F1. F1 causes an outward stress F2 in the first direction X on the first surface 31 side of the valve body 11, and an inward stress F3 occurs on the inlet-side rib 51 and the outlet-side rib 52.

The size of F2 and F3 was obtained by analysis to determine whether it was good. Since the magnitude of F2 is proportional to the magnitude of F3, only F2 is used as a criterion. FIG. 11 is a diagram showing a determination result in the above embodiment.

In the first state, the case where the stress was 400 MPa or less was determined to be good, in the second state, the case where the stress was 2 MPa or less was determined to be good, and in the third state, the case where the stress was 50 MPa or less was determined to be good. .

As shown in the figure, when θ1 and θ2 are 110 ° or more and 170 ° or less, the determination is good in any of the above three states.

<4. Features>
(4-1)
The diaphragm valve 10 according to the present embodiment includes a valve body 11, a diaphragm 12, a bonnet 13, and a drive mechanism 14. The valve body 11 includes an inlet-side channel 241, an outlet-side channel 242, a communication portion 243, a first surface 31, a second surface 32, an inlet-side rib 51, and an outlet-side rib 52. . The communication part 243 communicates the inlet side channel 241 and the outlet side channel 242. The first surface 31 is formed with an opening 31 a that faces the communication portion 243. The second surface 32 faces the first surface 31 with the inlet-side channel 241 and the outlet-side channel 242 interposed therebetween. The inlet-side rib 51 is provided on the second surface 32 and is formed along the inlet-side flow path 241. The outlet-side rib 52 is provided on the second surface 32 and is formed along the outlet-side flow path 242. The diaphragm 12 is disposed on the first surface 31 so as to close the opening 31a. The bonnet 13 is fixed to the valve body 11 so as to cover the diaphragm 12. The drive mechanism 14 drives the diaphragm 12 so as to close or open the communication part 243. A recess 51 a is formed in the inlet side rib 51. A concave portion 52 a is formed in the outlet side rib 52.

As described above, by forming the

recesses

51a and 52a in the first rib 41 formed along the flow path 24, even when an external force is applied to the diaphragm valve 10, the stress generated in the valve body 11 is reduced. Can be dispersed.

That is, the effect of reinforcing the valve body is provided by providing the rib, but stress may be concentrated in the vicinity of the rib. Therefore, the stress can be dispersed by forming the

recesses

51a and 52a as described above. It becomes possible.

Therefore, the long-term durability performance of the diaphragm valve 10 can be improved.
(4-2)
In the diaphragm valve 10 of the present embodiment, a first inclined end portion 511 and a second inclined end portion 512 are formed in the recess 51a. The first inclined end portion 511 is inclined so as to approach the first surface 31 toward the second inclined end portion 512 side, and the second inclined end portion 512 is the first surface toward the first inclined end portion 511 side. The angle θ1 formed by the first inclined end portion 511 and the second inclined end portion 512 is 110 degrees or more and 170 degrees or less. A first inclined end 521 and a second inclined end 522 are formed in the recess 52a. The first inclined end 521 is inclined so as to approach the first surface 31 toward the second inclined end 522, and the second inclined end 522 is the first surface toward the first inclined end 521. The angle θ2 formed by the first inclined end portion 521 and the second inclined end portion 522 is 110 degrees or more and 170 degrees or less.

As described above, by setting the angles θ1 and θ2 formed by the first

inclined end portions

511 and 521 and the second inclined end portions 512 and 522 to 110 degrees or more and 170 degrees or less, an external force is applied to the diaphragm valve 10. Even in this case, the stress generated in the valve body 11 can be dispersed.

The effect of reinforcing the valve body is provided by providing the rib. However, stress may concentrate near the rib, so that the first

inclined end portions

511 and 521 and the second inclined end portions 512 and 522 are connected as described above. By forming it, it becomes possible to disperse the stress.

Therefore, the long-term durability performance of the diaphragm valve 10 can be improved.
(4-3)
In the diaphragm valve 10 of the present embodiment, a recess 51 a is provided in the inlet side rib 51, and a recess 52 a is provided in the outlet side rib 52.

Thereby, the stress can be dispersed throughout the flow path 24 of the valve body 11 of the diaphragm valve 10.

(4-4)
In the diaphragm valve 10 of the present embodiment, the first inclined end portion 511 and the second inclined end portion 512 are continuously connected by the curved end portion 513. Moreover, the 1st inclination edge part 521 and the 2nd inclination edge part 522 are continuously connected by the curved edge part 523 (an example of the curved edge part).

Thereby, the effect of dispersing the stress can be exhibited.
(4-5)
In the diaphragm valve 10 of the present embodiment, the drive mechanism 14 includes a stem 63, a compressor 61, and a handle 64 (an example of a drive unit). The stem 63 is supported by the bonnet 13. The compressor 61 is attached to the stem 63 and is connected to the diaphragm 12. The handle 64 drives the stem 63. The handle 64 is a manual type.

Thus, the stem 63 can be driven manually, and the flow path 24 is shut off or opened.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the above embodiment, the recesses are formed in both the inlet-side rib 51 and the outlet-side rib 52, but may be formed in only one of them. Even in this case, the effect of relieving stress can be exhibited by at least the concave portion on the side where the concave portion is provided.

(B)
In the diaphragm valve 10 of the above-described embodiment, the manual handle 64 is provided as an example of the drive unit, but the stem 63 may be driven by an air drive type or an electric drive type drive unit.

(C)
In the diaphragm valve 10 of the above-described embodiment, the wall portion 33 is provided. However, the wall portion 33 may not be provided. In short, the diaphragm 12 can be closed or opened. That's fine.

(D)
In the diaphragm valve 10 of the above embodiment, the curved end portion 513 is formed between the first inclined end portion 511 and the second inclined end portion 512, and between the first inclined end portion 521 and the second inclined end portion 522. Although the curved end portion 523 is formed, both or one of the curved end portions 513 and 523 may not be formed, and the inclined end portions may be directly connected to each other.

Further, the first inclined end portion 511 and the second inclined end portion 512 and / or the first inclined end portion 521 and the second inclined end portion 522 are not curved ends but linearly formed ends. It may be connected.

The diaphragm valve of the present invention exhibits an effect of improving long-term durability performance, and is useful when used in a plant or the like.

DESCRIPTION OF SYMBOLS 10 Diaphragm valve 11 Valve body 12 Diaphragm 13 Bonnet 14 Drive mechanism 24 Flow path 31 1st surface 31a Opening 32 2nd surface 51 Inlet side rib 51a Recessed part 52 Outlet side rib 52a Recessed part 241 Inlet side channel 242 Outlet side channel 243 Communication Part 511 First inclined end part 512 Second inclined end part 521 First inclined end part 522 Second inclined end part

Claims

An inlet-side flow channel, an outlet-side flow channel, a communication portion that communicates the inlet-side flow channel and the outlet-side flow channel, a first surface having an opening facing the communication portion, and the inlet-side flow A second surface facing the first surface across the passage and the outlet-side flow channel, an inlet-side rib provided on the second surface and formed along the inlet-side flow channel, and the second surface A valve body having an outlet-side rib formed along the outlet-side flow path,
A diaphragm disposed on the first surface so as to close the opening;
A bonnet fixed to the valve body so as to cover the diaphragm;
A drive mechanism for driving the diaphragm so as to shield or open the communication part,
A recess is formed in at least one of the inlet side rib and the outlet side rib.
Diaphragm valve.
The rib has a first inclined end and a second inclined end in the recess,
The first inclined end portion is inclined toward the second inclined end portion so as to approach the first surface, and the second inclined end portion is moved toward the first inclined end portion. Inclined to approach the surface, the angle formed by the first inclined end and the second inclined end is 110 degrees or more and 170 degrees or less.
The diaphragm valve according to claim 1.
The recess is provided in both the inlet side rib and the outlet side rib.
The diaphragm valve according to claim 1 or 2.
The diaphragm valve according to claim 2, wherein the first inclined end portion and the second inclined end portion are continuously connected by a curved end portion.
The drive mechanism is
A stem supported by the bonnet;
A compressor attached to the stem and connected to the diaphragm;
A drive unit for driving the stem,
The driving unit is a manual type, an air driving type, or an electric driving type.
The diaphragm valve according to any one of claims 1 to 4.