JP2021148171A - Butterfly valve and manufacturing method of the same - Google Patents

Abstract

To provide a butterfly valve which enables easy attachment of a seat ring to achieve high convenience for replacement.SOLUTION: In a butterfly valve 1, a valve box 11 has a seat ring holding part 52 and a valve box body 51. The seat ring holding part 52 has a valve box pressing part 71 and a valve box cutoff part 72 which sandwich a seat ring 14. The valve box pressing part 71 has a contact part 83 and a fitted part 89. The contact part 83 sandwiches the seat ring 14. The fitted part 89 is formed in a circumferential direction R. The valve box cutoff part 72 has a contact part 93 and a fitting part 99. The contact part 93 sandwiches the seat ring 14. The fitting part 99 fits in the fitted part 89. The fitting part 99 fits in the fitted part 89 by the valve box pressing part 71 being rotated relative to the valve box cutoff part 72 in the circumferential direction R.SELECTED DRAWING: Figure 2

Description

The present invention relates to a butterfly valve and a method for manufacturing a butterfly valve.

Conventionally, butterfly valves have been used to open and close pipes in chemical factories, water and sewage systems, agriculture, fisheries, etc. The butterfly valve has a structure in which water is stopped by the contact surface pressure generated by compressing the seat ring on the outer peripheral surface of the valve body (see, for example, Patent Document 1).

Since the seat ring is compressed by the valve body in this way, it needs to be replaced regularly.

JP-A-2009-97556

However, in the conventional configuration, it is difficult to replace the seat ring because it is necessary to deform and attach the seat ring when the seat ring is replaced, and the seat ring may be deformed due to excessive compression deformation at the time of replacement.

An object of the present invention is to provide a butterfly valve and a method for manufacturing a butterfly valve with high replacement convenience in which a seat ring can be easily attached.

In order to achieve the above object, the butterfly valve according to the first invention includes a valve box, a valve stem, a valve body, and a seat ring. The valve box has a through hole forming a flow path. The valve stem is rotatably supported by the valve box. The valve body is provided in the through hole and rotates with the rotation of the valve stem. The seat ring is located in the valve box and is in contact with the valve body. The valve box has a seat ring holding portion and a valve box main body. The seat ring holding portion holds the seat ring and has a through hole. The valve box body is arranged around the seat ring holding portion. The seat ring holding portion has a first member and a second member that sandwich the seat ring. The first member has a first contact portion and a fitted portion. The first contact portion sandwiches the second member and the seat ring. The fitted portion is formed in the circumferential direction. The second member has a second contact portion and a fitting portion. The second contact portion sandwiches the first member and the seat ring. The fitting portion is fitted with the fitting portion. The fitting portion is fitted with the fitting portion by rotating the first member relative to the second member in the circumferential direction.

In this way, by rotating the first member relative to the second member in the circumferential direction with the seat ring sandwiched between the first member and the second member, between the first member and the second member. The seat ring can be held.

Therefore, when the seat ring is attached, the seat ring is not excessively compressed and deformed, so that the deformation of the seat can be suppressed and the seat ring can be easily attached.

The butterfly valve according to the second invention is the butterfly valve according to the first invention, and the fitted portion has a plurality of grooves formed at predetermined intervals along the circumferential direction. The fitting portion is formed along the circumferential direction and has a plurality of convex portions that fit into the groove. When the first member is rotated relative to the second member in the circumferential direction, the convex portion is inserted into the groove.

In this way, the first member and the second member can be fitted by rotating the first member relative to the second member in the circumferential direction and inserting the convex portion into the groove, and the first member can be fitted. And the second member can hold the seat ring.

The butterfly valve according to the third invention is the butterfly valve according to the second invention, and the plurality of grooves are the outer peripheral surfaces of the first member at predetermined intervals from the surface of the first member facing the second member. It is provided in. The fitted portion is formed from a surface of the first member facing the second member, and has a notch portion communicating with the groove. The fitting portion further has a plurality of peripheral edge projecting portions that project from the surface of the second member facing the first member toward the first member side and are provided at predetermined intervals along the circumferential direction. The protrusions are provided from each peripheral protrusion toward the inside of the through hole, and can be inserted into the notch.

As a result, the first member is moved toward the second member so as to insert the convex portion into the notch portion, and then the first member is rotated relative to the second member in the circumferential direction. A convex portion can be inserted into the groove.

The butterfly valve according to the fourth invention is the butterfly valve according to the second or third invention, and the fitted portion has a regulating portion arranged at one end of a groove in the circumferential direction. The regulating portion is in contact with the convex portion.

As a result, when the first member is rotated relative to the second member in the circumferential direction, the convex portion of the second member comes into contact with the regulating portion of the first member, and the rotation is stopped. As a result, it is possible to regulate excessive rotation, and the operator can easily assemble the first member and the second member.

The method for manufacturing a butterfly valve according to a fifth invention is a valve box having a through hole forming a flow path, a valve rod rotatably supported by the valve box, and a valve rod provided in the through hole to rotate the valve rod. A method for manufacturing a butterfly valve, which comprises a valve body that rotates with the valve body and a seat ring that is arranged in a valve box so as to project into a through hole and is in contact with the outer edge of the valve body. It includes a second step, a third step, and a fourth step. In the first step, a seat ring is sandwiched between the first member and the second member, the first member is rotated relative to the second member in the circumferential direction, and the first member is fitted to the fitted portion of the first member. The fitting portion of the two members is fitted to create a seat ring holding portion that holds the seat ring between the first member and the second member. In the second step, the seat ring holding portion is arranged on the valve box main body to create the valve box. In the third step, the valve body is arranged in the through hole inside the seat ring holding portion. In the fourth step, the valve stem is arranged on the valve box body and the seat ring holding portion.

In this way, by rotating the first member relative to the second member in the circumferential direction with the seat ring sandwiched between the first member and the second member, between the first member and the second member. The seat ring can be held.

Therefore, when the seat ring is attached, the seat ring is not excessively compressed and deformed, so that the deformation of the seat can be suppressed and the seat ring can be easily attached.

According to the present invention, it is possible to provide a butterfly valve and a butterfly valve with high replacement convenience to which a seat ring can be easily attached.

The perspective view of the butterfly valve in embodiment according to this invention. FIG. 1 is a partial cross-sectional view of the front surface of the butterfly valve of FIG. An exploded perspective view of the butterfly valve of FIG. The perspective view which shows the seat ring holding part and the seat ring of the butterfly valve of FIG. FIG. 3 is a cross-sectional view showing a seat ring holding portion and a seat ring of the butterfly valve of FIG. It is a perspective view which shows the valve box holding part of the seat ring holding part of FIG. FIG. 3 is a perspective view showing a valve box water stop portion of the seat ring holding portion of FIG. The figure for demonstrating the assembly of the valve box holding part of FIG. 6 and the valve box water stop part of FIG.

The butterfly valve 1 according to the embodiment of the present invention will be described with reference to the drawings.

<Structure>
(Overall configuration of butterfly valve)
FIG. 1 is a perspective view showing the appearance of the butterfly valve 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the butterfly valve 1. FIG. 3 is an exploded perspective view of the butterfly valve 1. In FIG. 3, only the main parts are shown, and the parts are omitted as appropriate.

The butterfly valve 1 of the present embodiment is a two-way valve that opens and closes a flow path through which a fluid flows in one direction.

The butterfly valve 1 of the present embodiment includes a valve box 11, a valve rod 12, a valve body 13, a seat ring 14, a locking plate 15, and an operation handle 16.

The valve box 11 is formed with a through hole 21 that forms a flow path. The valve stem 12 is arranged across the through hole 21 and is rotatably supported by the valve box 11. The valve body 13 is provided in the through hole 21 and rotates with the rotation of the valve rod 12. The seat ring 14 is arranged in the valve box 11 and is in contact with the valve body 13. The locking plate 15 is fixed to the valve box 11 and locks the position of the operation handle 16. The operation handle 16 is connected to the valve rod 12 and can rotate around the valve rod 12. By rotating the operation handle 16, the valve body 13 fixed to the valve stem 12 can be rotated to open and close the flow path.

(Valve box 11)
The valve box 11 may be, for example, a resin such as polyvinyl chloride, polypropylene, polystyrene, ABS resin, polytetrafluoroethylene, perfluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene, and iron, copper, and copper. It may be a metal such as alloy, brass, aluminum or stainless steel, or may be made of any of porcelain and the like.

In the present embodiment, the valve box 11 is composed of the valve box main body 51 and the seat ring holding portion 52. These configurations will be described in detail later, and the overall configuration of the valve box 11 will be described first. do.

As shown in FIG. 2, the valve box 11 is formed with a through hole 21, a plurality of connection holes 22 (see FIG. 1), a first insertion hole 23, and a second insertion hole 24.

The through hole 21 is formed substantially in the center of a substantially circular shape. The through hole 21 forms a flow path through which the fluid flows.

The plurality of connection holes 22 are formed so as to penetrate around the through holes 21 of the valve box 11. A plurality of connection holes 22 are provided for connecting to the pipe member. For example, a bolt or the like is inserted into the connection hole 22 to connect with the flange portion of the pipe member.

The first insertion hole 23 penetrates from the inner peripheral surface 26 of the through hole 21 to the outer peripheral surface 27 of the valve box 11 and is formed in the valve box 11. The first insertion hole 23 is formed in a direction perpendicular to the central axis O of the through hole 21. Although not shown in FIG. 2, the locking plate 15 shown in FIG. 1 is fixed to the outer peripheral surface 27.

The second insertion hole 24 is formed from the inner peripheral surface 26 of the through hole 21 to the outside of the valve box 11. The second insertion hole 24 is provided so as to face the first insertion hole 23 with the central axis O of the through hole 21 interposed therebetween. The second insertion hole 24 is provided on the same straight line as the first insertion hole 23 (the central axis P of the valve stem 12). The opening of the second insertion hole 24 to the outside of the valve box 11 is closed by the cap 25.

Peripheral portions 28 and 29 are formed on the peripheral edges of both openings of the through hole 21. The peripheral edges 28 and 29 are substantially annular in front view and are formed in a plane. The peripheral edges 28 and 29 are arranged parallel to the central axis P and perpendicular to the central axis O.

An annular grooves 28a and 29a are formed in each of the peripheral edges 28 and 29 so as to surround the opening of the through hole 21. Water stop rings 17 and 18 for preventing leakage from the connected pipes are fitted in the grooves 28a and 29a.

(Valve rod 12)
The valve stem 12 is, for example, a square pillar-shaped member made of a metal such as stainless steel, and as shown in FIG. 2, a valve body 13 described later is fixed in the middle.

The valve rod 12 penetrates the first insertion hole 23 of the valve box 11, crosses the through hole 21 of the valve box 11, is inserted into the second insertion hole 24 of the valve box 11, and the first end 12a is the second insertion. It is arranged in the hole 24. Further, as shown in FIG. 2, the second end 12b of the valve rod 12 projects outward from the outer peripheral surface 27 of the valve box 11. An operation handle 16 is connected to the second end 12b.

A bush 31 is arranged between the valve body 13 and the first end 12a between the valve rod 12 and the second insertion hole 24. The bush 31 rotates together with the valve rod 12 and slides on the inner peripheral surface of the second insertion hole 24.

A bush 32 is arranged between the valve rod 12 and the first insertion hole 23 between the valve body 13 and the second end 12b and adjacent to the valve body 13. A pressing member 33 is provided between the valve stem 12 and the first insertion hole 23 and adjacent to the bush 32. The bush 32 and the holding member 33 rotate together with the valve rod 12 and slide on the inner peripheral surface of the first insertion hole 23.

(Valve body 13)
The valve body 13 is formed of, for example, a resin material such as PP (polypropylene), PVDF (polyvinylidene fluoride), PVC (polyvinyl chloride), and has a substantially disk shape.

The valve body 13 of the present embodiment is a valve body of an eccentric valve. The valve body 13 is fixed to the valve rod 12, rotates in the through hole 21 as the valve rod 12 rotates, is fixed to the valve box 11, and comes into contact with the seat ring 14 arranged in the through hole 21. Closes the through hole 21.

As shown in FIG. 3, the valve body 13 is formed with a valve rod hole 41 through which the valve rod 12 is penetrated and fixed. The valve stem hole 41 is formed perpendicular to the central axis O.

The valve body 13 has a substantially disk shape and has an outer peripheral end surface 42. The outer peripheral end surface 42 presses the seat ring 14 of the through hole 21 when the valve body 13 is closed.

(Seat ring 14)
The seat ring 14 has an annular shape and is held in the valve box 11 as shown in FIG. The seat ring 14 may be a rubber-like elastic body, and is not particularly limited. For example, ethylene propylene rubber, ethylene propylene diene rubber, isoprene rubber, chloroprene rubber, chlorosulphonized rubber, nitrile rubber, and styrene. Suitable examples include butadiene rubber, chlorinated polyethylene, fluororubber (FPM, FKM), and the like.

(Holding structure of seat ring 14 by valve box 11)
Next, the holding structure of the seat ring 14 by the valve box 11 will be described.

The valve box 11 has a valve box main body 51 and a seat ring holding portion 52. The seat ring holding portion 52 forms a through hole 21 and holds the seat ring 14. The valve box main body 51 is arranged around the seat ring holding portion 52.

(Valve box body 51)
As shown in FIGS. 2 and 3, the valve box main body 51 is provided with the connection hole 22 and the outer peripheral surface 27 described above. The valve box main body 51 is formed with a through hole 60 having a diameter larger than that of the through hole 21. The seat ring holding portion 52 is arranged inside the through hole 60. Further, the valve box main body 51 is formed with an insertion hole portion 61 which is a part of the first insertion hole 23 and an insertion hole portion 62 which is a part of the second insertion hole 24.

(Seat ring holding portion 52)
FIG. 4 is a perspective view showing the seat ring holding portion 52. FIG. 5 is a side sectional view of the seat ring holding portion 52.

As shown in FIGS. 4 and 5, the seat ring holding portion 52 has a cylindrical shape and holds the seat ring 14.

The seat ring holding portion 52 has a valve box holding portion 71 (an example of a first member) and a valve box water blocking portion 72 (an example of a second member).

By combining the valve box holding portion 71 and the valve box water blocking portion 72, the seat ring 14 can be held by the valve box holding portion 71 and the valve box water blocking portion 72.

(Valve box holding part 71)
FIG. 6 is a perspective view of the valve box holding portion 71.

The valve box holding portion 71 has a substantially cylindrical shape, and the valve box holding portion 71 is formed with a through hole 80 forming a flow path in the center along the axis O.

Further, in the valve box holding portion 71, the insertion hole portion 81, which is a part of the first insertion hole 23, and the second insertion hole 24, in which the valve rod 12 is inserted in the direction perpendicular to the through hole 80, An insertion hole portion 82, which is a part of the insertion hole portion 82, is formed. The insertion hole portion 81 and the insertion hole portion 82 are arranged so as to sandwich the through hole 80 in a straight line. The insertion hole portion 81 and the insertion hole portion 82 are formed along the central axis P. The first insertion hole 23 shown in FIG. 2 is formed by the insertion hole 81 of the valve box holding portion 71 and the insertion hole 61 of the valve box main body 51. The second insertion hole 24 shown in FIG. 2 is formed by the insertion hole 82 of the valve box holding portion 71 and the insertion hole 62 of the valve box main body 51.

As shown in FIGS. 5 and 6, the valve box holding portion 71 has a first end surface 71a (an example of a surface of the first member facing the second member) and a first end surface 71a on the valve box water stop portion 72 side. It has a second end surface 71b on the opposite side to the above and an outer peripheral surface 71c. The first end surface 71a is provided substantially perpendicular to the shaft O, and is a surface facing the valve box water stop portion 72. The second end surface 71b is provided substantially perpendicular to the axis O, and is a surface opposite to the first end surface 71a. The second end surface 71b constitutes the peripheral portion 29 described above, and a groove 29a for arranging the water stop ring 18 is formed.

As shown in FIG. 6, the valve box holding portion 71 has a contact portion 83 (an example of a first contact portion) and a fitted portion 89.

The contact portion 83 is a portion that sandwiches the seat ring 14 together with the valve box water stop portion 72. The fitted portion 89 is a portion that fits with the valve box water stop portion 72.

(Abutment portion 83)
The contact portion 83 comes into contact with the seat ring 14 and holds the seat ring 14 together with the valve box water stop portion 72. The contact portion 83 is formed on the first end surface 71a of the valve box holding portion 71 on the valve box water stop portion 72 side.

The first end surface 71a has a contact portion 83, an outer portion 84, and a step portion 85. The contact portion 83 has an annular shape and is an inner portion of the first end surface 71a. The outer portion 84 is a portion of the first end surface 71a arranged outside the contact portion 83. The contact portion 83 is provided at a position farther from the valve box water stop portion 72 than the outer portion 84. The step portion 85 is a portion of the first end surface 71a that connects the contact portion 83 and the outer portion 84. The step portion 85 is provided along the central axis O.

As shown in FIG. 5, the first end surface 14a of the seat ring 14 is in contact with the contact portion 83. The contact portion 83 is provided with two grooves 83a formed over the entire circumference. Two protrusions 14b are formed on the first end surface 14a of the seat ring 14 over one circumference, and are fitted into the two grooves 83a.

(Matted portion 89)
As shown in FIG. 6, the fitted portion 89 has a plurality of grooves 86, a plurality of notched portions 87, and a regulating portion 88.

The plurality of grooves 86 are provided on the outer peripheral surface 71c of the valve box holding portion 71 at predetermined intervals along the circumferential direction. The plurality of grooves 86 are formed in the vicinity of the first end surface 71a. The plurality of grooves 86 are provided on the first end surface 71a side of the insertion hole portion 81 and the insertion hole portion 82. In the present embodiment, for example, four grooves 86 are provided, and the intervals between adjacent grooves 86 are equally formed.

The cutout portion 87 is provided between the grooves 86 adjacent to each other in the circumferential direction. The notch portion 87 is formed from the first end surface 71a in the direction opposite to the valve box water stop portion 72. A notch 87 communicates with the end of the groove 86 on one R1 side of the circumferential direction R. The depth of the notch 87 toward the central axis O is formed to be the same as the depth of the groove 86. In the present embodiment, the cutout portions 87 are formed at, for example, four places.

The regulating portion 88 is provided at the end of the groove 86 on the other R2 side of the circumferential direction R. The regulating portion 88 is formed so as to close the end of the groove 86. In the present embodiment, the regulating portion 88 is provided only at the end of one groove 86 on the R2 direction side, but may be provided at the end of all the grooves 86 on the R2 direction side. The regulating portion 88 is formed so as to connect the side wall portion 86a on the side of the first end surface 71a of the groove 86 and the side wall portion 86b on the side opposite to the first end surface 71a of the groove 86. The surface of the side wall portion 86a on the valve box water stop portion 72 side constitutes a part of the first end surface 71a.

Further, the surface 87a of the notch portion 87 perpendicular to the axis O coincides with the surface of the side wall portion 86b on the groove 86 side and 86c.

(Valve box water stop 72)
FIG. 7 is a perspective view showing the valve box water stop portion 72.

The valve box water stop portion 72 has a substantially cylindrical shape, and the valve box water stop portion 72 is formed with a through hole 90 forming a flow path in the center along the axis O. In a state where the valve box water stop portion 72 and the valve box holding portion 71 are combined, as shown in FIG. 4, the through hole 80 and the through hole 90 form the through hole 21 of the valve box 11 described above.

Further, as shown in FIGS. 5 and 7, the valve box water stop portion 72 includes a first end surface 72a (an example of a surface of the second member facing the first member) on the valve box holding portion 71 side and a first. It has a second end surface 72b opposite to the end surface 72a and an outer peripheral surface 72c. The first end surface 72a is provided substantially perpendicular to the shaft O, and is a surface facing the first end surface 71a of the valve box holding portion 71. The second end surface 71b is provided substantially perpendicular to the axis O, and is a surface opposite to the first end surface 71a. The second end surface 71b constitutes the peripheral portion 28 described above, and a groove 28a for arranging the water stop ring 17 is formed.

As shown in FIG. 7, the valve box water stop portion 72 has a contact portion 93 (an example of a second contact portion) and a fitting portion 99.

The contact portion 93 is a portion that sandwiches the seat ring 14 together with the valve box holding portion 71. The fitting portion 99 is a portion that fits with the valve box holding portion 71.

(Abutment portion 93)
The contact portion 93 is formed on the first end surface 72a of the valve box water stop portion 72 on the valve box holding portion 71 side. The first end surface 72a has a contact portion 93, an outer portion 94, and a step portion 95. The contact portion 93 has an annular shape and is an inner portion of the first end surface 72a. The outer portion 94 is a portion of the first end surface 72a arranged outside the contact portion 93. The contact portion 93 is provided at a position farther from the valve box holding portion 71 than the outer portion 84. The step portion 95 is a portion of the first end surface 72a that connects the contact portion 93 and the outer portion 94. The step portion 95 is provided along the central axis O.

As shown in FIG. 5, the second end surface 14c of the seat ring 14 is in contact with the contact portion 93. Two grooves 93a are formed in the contact portion 93. Two protrusions 14d are formed on the second end surface 14c of the seat ring 14 over the entire circumference, and are fitted into the two grooves 93a.

The seat ring 14 is held by the seat ring holding portion 52 by sandwiching the seat ring 14 between the abutting portion 83 of the valve box holding portion 71 and the abutting portion 93 of the valve box water blocking portion 72. Further, since the width of the seat ring 14 in the radial direction (direction toward the central axis O or away from the central axis O) is formed longer than the width in the radial direction of the contact portions 83 and 93, the seat ring 14 is formed. , Protruding into through holes 80, 90. Further, in the state where the seat ring 14 is held, the step portion 95 and the step portion 85 are arranged outside the seat ring 14. Further, the step portion 95 and the step portion 85 are arranged at substantially the same positions in the radial direction.

(Mating portion 99)
As shown in FIG. 7, the fitting portion 99 has a plurality of peripheral protrusions 96 and a plurality of convex portions 97.

The plurality of peripheral edge protruding portions 96 are provided at predetermined intervals along the circumferential direction at the outer peripheral end (which can be said to be the outer peripheral end of the outer peripheral portion 94) of the first end surface 72a of the valve box water stop portion 72. The peripheral edge protruding portion 96 projects from the first end surface 72a toward the valve box holding portion 71 side along the axis O. In the present embodiment, for example, four peripheral protrusions 96 are provided, and the adjacent peripheral protrusions 96 are formed at equal intervals.

When the valve box holding portion 71 and the valve box water blocking portion 72 are combined, the peripheral edge protruding portion 96 is outside the outer peripheral surface 71c in the vicinity of the first end surface 71a of the valve box holding portion 71, as shown in FIG. Located in.

Each of the plurality of convex portions 97 is formed from the tip of the peripheral protruding portion 96 toward the central axis O side. The length of the convex portion 97 in the circumferential direction R is shorter than that of the notched portion 87. The width of the convex portion 97 along the axis O is formed to be slightly shorter than the width of the groove 86.

(Assembly of butterfly valve)
As an example of the first step of assembly, the valve box holding portion 71 and the valve box water blocking portion 72 are combined so as to sandwich the seat ring 14. The valve box holding portion 71 and the valve box water blocking portion 72 are combined by fitting the fitting portion 99 to the fitted portion 89.

As shown in FIG. 8, each convex portion 97 of the valve box water stop portion 72 is inserted into each notch portion 87 (see the arrow). Note that the seat ring 14 is omitted in FIG. By moving the valve box water stop portion 72 with respect to the valve box holding portion 71 along the central axis O direction, the convex portion 97 is inserted into the notch portion 87 until the convex portion 97 abuts on the surface 87a. ..

After that, the valve box water stop portion 72 is rotated with respect to the valve box holding portion 71 in the direction of arrow R2 in the circumferential direction R. As a result, each convex portion 97 is inserted into each groove 86. At this time, since the surface 87a and the inner surface 86c of the groove 86 are formed on the same surface, the convex portion 97 can be smoothly inserted into the groove 86.

Further, when the valve box water stop portion 72 is rotated with respect to the valve box holding portion 71 in the arrow R2 direction, the end 97a of the convex portion 97 on the arrow R2 direction side comes into contact with the regulation portion 88, so that the rotation is stopped. NS.

As shown in FIG. 5, the seat ring holding portion 52 in which the valve box holding portion 71 and the valve box water blocking portion 72 are assembled is created by the above operation. As a result, the seat ring 14 can be held by the seat ring holding portion 52.

Next, as an example of the second step, the seat ring holding portion 52 in a state of holding the seat ring 14 is arranged inside the insertion hole portion 61 of the valve box main body 51, and the valve box 11 is assembled.

Next, as an example of the third step, the valve body 13 is arranged in the through hole 21 inside the seat ring holding portion 52.

Next, as an example of the fourth step, the valve rod 12 is arranged on the valve box main body 51 and the seat ring holding portion 52. Specifically, the bush 32 is arranged in the insertion hole 61 of the valve box body 51 and the insertion hole 81 of the seat ring holding portion 52, and the bush 31 is the insertion hole 82 of the seat ring holding portion 52 and the valve. It is arranged in the insertion hole 62 of the box body 51. Then, the valve rod 12 has an insertion hole 61 of the valve box body 51, an insertion hole 81 of the seat ring holding portion 52, a valve rod hole 41 of the valve body 13, an insertion hole 82 of the seat ring holding portion 52, and a valve. It is inserted into the insertion hole 62 of the box body 51. Then, the pressing member 33 is arranged in the insertion hole portion 62 of the valve box main body 51. Next, the locking plate 15 is arranged in the valve box 11 and the operation handle 16 is attached to the second end 12b of the valve rod 12. Thereby, the butterfly valve 1 can be assembled.

When replacing the seat ring 14 in the butterfly valve 1 in use, the valve box water stop portion 72 is rotated in the direction of arrow R1 with respect to the valve box holding portion 71, and the convex portion 97 is cut out in the cutout portion 87. The seat ring 14 can be removed by disassembling the valve box holding portion 71 and the valve box water blocking portion 72 simply by pulling out the valve box holding portion 71 and the valve box water blocking portion 72. Therefore, the seat ring 14 can be easily replaced.

<Other embodiments>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention.

(A)
The butterfly valve 1 of the above embodiment is provided with an operation handle 16 and is manually opened and closed, but the valve 1 is not limited to this, and is pneumatically driven by air pressure or electrically driven by a motor or the like. May be.

(B)
In the above embodiment, four peripheral protrusions 96 and convex portions 97 are provided, and the present invention is not limited to these, but it is preferable that two or more are provided.

(C)
In the above embodiment, the valve box holding portion 71 is provided with the fitted portion 89, and the valve box water blocking portion 72 is provided with the fitting portion 99. However, the present invention is not limited to this, for example, the valve box holding portion. The fitting portion 99 may be provided on the 71, and the fitted portion 89 may be provided on the valve box water stop portion 72.

(D)
In the above embodiment, the outer peripheral surface 71c of the valve box holding portion 71 and the inner peripheral surface of the through hole 60 of the valve box main body 51 are formed smoothly, but the outer peripheral surface 71c has a convex portion along the axial direction O. A concave portion may be formed in the through hole 60 of the valve box main body 51 along the axial direction O so as to be formed and fitted to the convex portion. As a result, when assembling the valve box 11, the seat ring holding portion 52 can be arranged on the valve box main body 51 by sliding the convex portion into the concave portion, so that positioning is easy. A concave portion may be formed on the outer peripheral surface 71c, and a convex portion may be formed on the through hole 60.

According to the butterfly valve of the present invention, the seat ring can be easily attached, which has the effect of improving the convenience of replacement, and can be used for opening and closing various pipes such as chemical factories, water and sewage, agriculture, and fisheries.

1: Butterfly valve 11: Valve box 12: Valve rod 14: Seat ring 51: Valve box body 52: Seat ring holding part 71: Valve box holding part 72: Valve box water stop part 83: Contact part 89: Fitted Part 93: Contact part 99: Fitting part

Claims (5)

A valve box having a through hole forming a flow path and
A valve rod rotatably supported by the valve box,
A valve body provided in the through hole and rotating with the rotation of the valve stem,
A seat ring located in the valve box and capable of contacting the valve body is provided.
The valve box
A seat ring holding portion that holds the seat ring and has the through hole,
It has a valve box main body arranged around the seat ring holding portion, and has.
The seat ring holding portion has a first member and a second member that sandwich the seat ring.
The first member has a first contact portion that abuts on the seat ring and a fitted portion formed in the circumferential direction.
The second member has a second contact portion that abuts on the seat ring and a fitting portion that is fitted to the mated portion.
The fitting portion is fitted to the fitting portion by rotating the first member relative to the second member in the circumferential direction.
Butterfly valve. The fitted portion has a plurality of grooves formed at predetermined intervals along the circumferential direction.
The fitting portion is formed along the circumferential direction and has a plurality of convex portions that fit into the groove.
When the first member is rotated relative to the second member in the circumferential direction, the convex portion is inserted into the groove.
The butterfly valve according to claim 1. The plurality of grooves are provided on the outer peripheral surface of the first member at a predetermined distance from the surface of the first member facing the second member.
The fitted portion is
It has a notch that is formed from the surface of the first member that faces the second member and communicates with the groove.
The fitting portion is
It further has a plurality of peripheral edge protrusions which are projected from the surface of the second member facing the first member toward the first member side and are provided at predetermined intervals along the circumferential direction.
The convex portion is provided from each of the peripheral protrusions toward the inside of the through hole, and can be inserted into the notch.
The butterfly valve according to claim 2. The fitted portion has a regulating portion arranged at one end of the groove in the circumferential direction.
The regulating portion is brought into contact with the convex portion.
The butterfly valve according to claim 2 or 3. A valve box having a through hole forming a flow path, a valve rod rotatably supported by the valve box, a valve body provided in the through hole and rotating with the rotation of the valve rod, and the penetration. A method for manufacturing a butterfly valve, which is arranged in the valve box so as to project into a hole and includes a seat ring that can come into contact with the outer edge of the valve body.
The seat ring is sandwiched between the first member and the second member, and the first member is rotated relative to the second member in the circumferential direction so that the first member is fitted to the fitted portion of the first member. The first step of fitting the fitting portions of the two members to create a seat ring holding portion that holds the seat ring between the first member and the second member.
The second step of arranging the seat ring holding portion on the valve box body to create the valve box, and
A third step of arranging the valve body in the through hole inside the seat ring holding portion, and
A fourth step of arranging the valve stem on the valve box main body and the seat ring holding portion is provided.
How to make a butterfly valve.

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