JPS61252986A - Opening and closing apparatus for rotary valve equipped with subvalve - Google Patents

Abstract

PURPOSE:To certainly prevent the erroneous operation for permitting the generation of water-hammer phenomenon due to the erroneous order in the closure of a main valve body and a subvalve boy by turning a main valve shaft and a subvalve shaft by a single input shaft and allowing the interlocking of the main valve body and the subvalve body. CONSTITUTION:As for the gear parts 29 and 30 of driving gears 25 and 26, the phase is deflected so that the gear part 30 of the driving gear 26 does not mesh with a trailing gear 18 when the gear part 29 of the driving gear 25 meshes with a trailing gear 14, and the hear part 29 of the driving gear 25 does not mesh with the trailing gear 14 when the gear part 30 of the driving gear 26 meshes with the trailing gear 18. Therefore, in the course to the perfect opening from the perfect closure, a flow passage 7 is opened perfectly by a main valve body 8 after a communication hole 10 is perfectly opened by a subvalve body 13. While, in the course to the perfect closure from the perfect opening, the communication hole 10 is perfectly closed by the subvalve body 13 after the flow passage 7 is perfectly opened by the main valve body 8, and the generation of water-hammer phenomenon due to the sharp closure of the main valve body 8 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention comprises a main valve body and a sub-valve body, and both valve bodies are connected to an input shaft (
This invention relates to an opening/closing device for a rotary valve with an auxiliary valve, which is opened and closed by rotation from two sides.

(2) Prior art and problems to be solved by the invention As a switchgear as described above, the Utility Model Application Publication No. 56-1062
The one disclosed in Publication No. 74 is known. As shown in FIG. 11, a main valve body 03 that opens and closes a flow path 102 is rotatably disposed inside a valve box 10.
3 is provided with a communication hole 105 that communicates with the main valve body in the valve box on the upstream and downstream sides, and a sub-valve body 106 that opens and closes the communication hole is rotatably disposed. Main valve body 10
3 and auxiliary valve body] 06 has the main valve shaft 107 and the auxiliary valve shaft 1, respectively.
08, an auxiliary valve shaft 108 is rotatably fitted into the main valve shaft 107 and fixedly fitted thereto. Also, one end of each of the main valve shaft 107 and the auxiliary valve shaft 10g is located outside the valve box 101.
The input shaft 110 for the main valve element and the input shaft 1 for the sub-valve element are attached to the projecting end so that the valve 08 is longer. 109 is the main valve shaft 107 and the main valve body input shaft 1
10 is a bending transmission section that connects the two.

By the way, in the opening/closing device described above, when opening and closing the main valve body 103 and the sub-valve body 106, the main valve body input shaft 1]0 and the sub-valve body input shaft 111 must be operated individually. There is a problem that operation is troublesome. Therefore, the technical problem of this invention is to enable the main valve body and the sub-valve body to be operated in conjunction with each other using a single input shaft. (3) To solve the problems. The present invention solves the above-mentioned problems, and the opening/closing device of the first invention fixes a driven gear member for the main valve body to one end of the main valve shaft that protrudes outside the valve box. At the same time, a driven gear member for the auxiliary valve body is fixed to one end of the auxiliary valve shaft, and an input shaft is disposed parallel to both valve shafts, meshing with each of the driven gear members, and connecting the main valve body and the auxiliary valve body. Teeth that rotate the valve body 90 degrees to fully open or close are formed in a part of the circumferential direction, and the rest of the tooth is formed in a toothless part with an outer diameter that is equal to or less than the root diameter of the tooth. A driving gear member for the main valve element and a driving gear member for the auxiliary valve element are respectively fixed to the input shaft, and the teeth of the auxiliary driving gear member are
After the sub-valve element is rotated 90 degrees from fully closed to fully open due to the engagement between the teeth of the drive gear member for the sub-valve element and the driven gear member for the sub-valve element, the drive gear member for the main valve element is rotated 90 degrees from fully closed to fully open. The teeth are out of phase so that they mesh with the driven gear member for the main valve element, and the input shaft is sealed so that it rotates in the opposite direction after both the main valve element and the auxiliary valve element are fully opened. and a first locking member for the main valve body and a locking member for the secondary valve body, each having a locking portion at a position facing the toothless portion of the sub-drive gear member in the input shaft (=in the axial direction 1:). and fixing the first locking member.

Corresponding to this locking member for both cylinders 1, a tooth portion of a drive gear member for the main valve body is located at a position facing the driven gear member for the main valve body in the axial direction at one end of the main valve shaft. a second lock for the main valve body having a locking portion that locks with the locking portion of the second locking member for the main valve body when the main valve shaft does not mesh with the driven gear member for the main valve body; In addition to fixing the member, the teeth of the drive gear member for the sub-valve body are placed at a position facing the driven gear member for the sub-valve body in the axial direction at one end C2 of the sub-valve shaft. A second locking member for the sub-valve body is fixed, the second locking member having a locking portion interlocking with the first locking member for the sub-valve body when the sub-valve shaft that does not mesh with the gear member is not rotated. Features.

Further, in the opening/closing device of the second invention, a driven gear member for the main valve body is fixed to one end of the main valve shaft protruding outside the valve box, and a driven gear member for the sub valve body is fixed to one end of the sub valve shaft. The gear member is fixed and parallel to the two valve shafts (two input shafts and an intermediate shaft is disposed between the input shaft and both valve shafts in parallel thereto).

An intermediate gear member for the main valve body that meshes with the driven gear member for the main valve body is fixed to this intermediate shaft, and an intermediate gear member for the sub valve body that meshes with the driven gear member for the sub valve body A toothed portion that fixes the member, meshes with each intermediate gear member, and rotates the main valve element and the sub-valve element by 90' to fully open or fully close is formed in a portion in the circumferential direction, and other than the toothed portion A driving gear member for the main valve element and a driving gear member for the auxiliary valve element, which are formed in the toothless part whose outer diameter is equal to or less than the tooth bottom diameter, are respectively fixed to the input shaft, and the auxiliary driving gear member is fixed to the input shaft. The teeth of.

After the sub-valve element is rotated 90 degrees from fully closed to fully open due to the meshing C2 between the teeth of the drive gear member for the sub-valve element and the intermediate gear member for the sub-valve element, the drive gear for the main valve element is opened. The teeth of the member are out of phase so as to mesh with the intermediate gear member for the main valve element, and the input shaft is rotated in the opposite direction after both the main valve element and the auxiliary valve element are fully opened. It looks like this,
Further, a first locking member for the main valve body and a first locking member for the sub-valve body are fixed, each having a locking portion at a position facing the toothless portions of both drive gear members on the input shaft in the axial direction. , corresponding to this double cylinder 1 locking member.

When the main valve shaft is not rotating, the teeth of the drive gear member for the main valve body do not mesh with the intermediate gear member for the main valve body at a position axially facing the intermediate gear member for the main valve body on the intermediate shaft. ζ
: fixing a second locking member for the main valve body having a locking portion that locks with the first locking member for the main valve body; C: A first engaging member for the auxiliary valve element is located at a position facing the auxiliary valve element when the auxiliary valve shaft is not rotated, when the tooth portion of the driving gear member for the auxiliary valve element does not mesh with the intermediate gear member for the auxiliary valve element. It is characterized in that a second locking member for the sub-valve body is fixed, which has a locking portion that locks with the locking portion of the valve body.

(4) Action: The main valve body closes the flow path, and the sub valve body closes the communication hole. (When the input shaft is rotated from the fully closed state, the teeth of the drive gear member for the sub valve body meshing with the driven gear member of When the shaft is rotated, the meshing of the sub-valve gear system ends, and the teeth of the drive gear member for the main valve body of the main valve gear system begin to mesh with the driven gear member for the main valve body. The main valve shaft is rotated, and the main valve body opens the flow path, and when rotated 90 degrees, the flow path is fully opened.

At this time, the relative ζ=auxiliary valve body closes the communication hole. As a result, the main valve body fully opens the flow path and the sub valve body closes the communication hole, resulting in a fully open state.

Next, to achieve a fully closed state, the input shaft is rotated in the opposite direction. As a result, the main valve element completely closes the flow path, and the subsequent valve element closes the communication hole, reverting to the original fully closed state.

(5) Effects of the invention The main valve shaft and the auxiliary valve shaft are rotated by a single input shaft, the main valve body and the auxiliary valve body are interlocked, and when opening, the main valve body is fully opened after the auxiliary valve body is fully opened. When closing, the main valve body can be fully closed after the main valve body is fully closed. Therefore, it is possible to prevent erroneous operations such as the water hammer phenomenon occurring due to the wrong closing order of the main valve body and the sub-valve body ( Two can be prevented.

In addition, since the main valve body can be fully closed, the sub-valve body can be fully opened, so when the water flow rate is low at the time of installation in the pipeline, the water flow rate can be adjusted by simply opening and closing the sub-valve body. This makes it possible to prevent a pressure increase in the downstream pipeline.

(6) Embodiment In Figs. 1 to 3, 1 is a valve box having an inlet 2° on one side and an outlet 3 on the other side. 6 is rotatably supported. A main valve body 8 that opens and closes the flow path 7 is fixed to the main valve shaft 6, and a communication hole 10 that communicates the inlet 2 and the outlet 3 of the valve box l is bored in the center of the main valve body 8. A sub-valve shaft 1 is rotatably fitted into the main valve shaft 6, and a sub-valve body 3 for opening and closing the communication hole 0 is fixed to the sub-valve shaft 6. .From the bearing part 5 to the valve box] At one end of the main valve shaft 6 which protrudes outside, there is a driven gear 1 at the bottom.
A driven gear member 15 for the main valve body having a diameter of 4 is fixed via a key 16, and a driven gear 18 is provided at the lower part of one end of the auxiliary valve shaft 11 which similarly protrudes from the bearing portion 5 to the outside of the valve body 1. A driven gear member 19 for the sub-valve body is fixed via a key 20.

On the other hand, a force is applied to cover both driven gear members 15.19;
An R-casing 22 is mounted on the bearing 5, in which the input shaft 23 is rotatably supported parallel to the two valve shafts 6.11.

A drive gear member 27 for both the main valve body and the sub-valve body is fixed to the input shaft 23 via a key 28, and has a drive gear 25.26 at a position facing the driven gear 14.18. The driving gear 25 includes a toothed portion 29 that meshes with the driven gear 14 and rotates the main valve body 8 by 90 degrees to fully open or close it, and a toothless portion 31 whose outer diameter is the bottom diameter of the toothed portion other than the toothed portion 29. It is composed of.

The driving gear 26 meshes with the driven gear 18 and rotates the sub-valve body 13 by 9.
It is composed of a toothed portion 30 that is rotated by 0° to be fully open or fully closed, and a toothless portion 32 whose outer diameter is the root diameter of the tooth other than the toothed portion 30. In addition, the teeth 29.30 of the 2nd drive gear 25.26
When the tooth portion 29 of the drive gear 25 meshes with the driven gear 14, the tooth N30 of the drive gear 26 does not mesh with the driven gear 18, and conversely, the tooth portion 30 of the drive gear 26 meshes with the driven gear 18. When the tooth portion 29 of the drive gear 25 is
Its phase is shifted so that it does not mesh with L14.

A locking protrusion 34.35 is provided on the drive gear member 27 that faces the toothless portions 3], 32 of the drive gears 25, 26 in the axial direction. Further, when the main valve shaft 6 does not rotate, when the teeth 29 of the drive gear 25 do not mesh with the driven gear 14, the driven gear member 5 for the main valve body has a locking protrusion 34 of the drive gear member 27.
A locking recess 37 is provided for locking.

The driven gear member 19 for the sub-valve body has the teeth 3 of the drive gear 26.
0 is the driven gear] The locking recess 3 locks with the locking protrusion 35 of the driving gear member 27 when the sub valve shaft 11 does not mesh with the driven gear 8.
8 is provided.

In Fig. 1, 40 is a valve seat for the main valve body 8, 41 is a valve seat for the sub-valve body 13, the bearing portion is 5 degrees, 42.42' is a bearing, and 43.43' is a bush.

44.44' is a knocking ring, 45.45' is a knocking holder, 4C is a bearing part, a support member for the main valve shaft 6, 4τ is a jack gel), and 48' is a hook. At the top of the case 22, a worm wheel (not shown) is connected to the upper end of the input shaft 23, and by rotating the operating handle 51, the worm on the handle shaft and the The input shaft 23 is made rotatable via a worm wheel.

The operation of the above embodiment will be explained.

3A to 3D in the fully closed state shown in FIG.
As shown in the figure, the tooth portion 3 of the drive gear 26 of the sub-valve gear system
0 meshes with the driven gear [8], but the teeth 29 of the drive gear 25 of the main valve gear system do not mesh with the driven gear 14. Also, at this time, the locking protrusion 34 of the drive gear member 27 of the main valve system is connected to the locking recess 37 of the driven gear member 15 for the main valve body.
The locking protrusion 35 of the drive gear member 27 of the sub-valve system
is not engaged with the engagement recess 38 of the driven gear member [9] for the sub-valve body.

When the input shaft 23 is rotated in the opening direction by the operating handle 51 from this fully closed state, the auxiliary valve shaft 1 is rotated by the meshing of the driven gear 18 with the teeth 30 of the driving gear 26 of the auxiliary valve gear system. The sub-valve body 13 opens the communication hole 0 of the main valve body 8, and the teeth 30 of the drive gear 26 and the driven gear 18
When the engagement is completed, the sub-valve body 13 is rotated by 9G',
As shown in FIG. 5, ζ: The communication hole IO is fully opened. At this time, the relationship between the main and auxiliary valve gear systems and the locking parts of the main and auxiliary valve systems is as shown in FIGS. 6A to 6D. When the process is completed, the drive gear 2 of the main valve body gear system is moved as shown in Fig. 6D.
5 and the driven gear] 4 starts to match. Therefore, when the input shaft 23 is rotated in the opening direction two times in a row, the main valve shaft 6 is rotated due to the meshing of the teeth 29 of the drive gear 25 of the main valve body gear system and the driven gear 14, and thereby the main valve body 8 is rotated. When the flow path 7 is opened and the engagement between the teeth 29 of the driving gear 25 and the driven gear 14 approaches the end, the main valve body 8 is rotated by 90 degrees as shown in FIG. The second flow path 7 is fully opened. At this time, the relationship between the main and auxiliary valve body gear systems and the locking parts of the main and auxiliary valve systems is as shown in FIGS. 8A to 8D. Since there is no mesh between the teeth 29 of the drive gear 25 of the gear system and the driven gear 14, the sub-valve shaft 11 is not rotated, and therefore the sub-valve body 13 maintains its position, so that the main valve body 8 is rotated as described above. When it reaches the fully open position, the communication hole IO is relatively closed.

Next, in order to change the state from the fully open state shown in FIG. The lid now rotates in the closing direction, which is the opposite direction. When the input shaft 23 rotates, the main valve shaft 6 is rotated by the engagement between the teeth 29 of the drive gear 25 of the main valve body gear system and the driven gear 14, and as a result, the main valve body 8 first closes the flow path 7. When the flow path 7 is rotated by 90 degrees,
fully closed. In this state, the meshing between the teeth 29 of the drive gear 25 of the main valve gear system and the driven gear 4 is completed, and the meshing between the teeth 30 of the drive gear 26 of the universal valve gear system and the driven gear 18 is completed. It has started.

Therefore, when the input shaft 23 continues to rotate in the closing direction, the auxiliary valve shaft 1] is rotated due to the engagement between the teeth 30 of the drive gear 26 of the auxiliary valve gear system and the driven gear 18, and the auxiliary valve shaft 1 is rotated by which The communication hole opened when the flow path 7 is completely closed by the main valve body 8ζ2 is closed, and the tooth portion 3 of the drive gear 26 is closed.
0 and driven gear ] 8 approaches the end, the sub-valve body 13
is rotated 90' and reaches a fully closed state.

As described above, from fully closed to fully open, the communication hole 1o is fully opened by the sub-valve body 13, and then the flow path 7 leading to the main valve body 8 is fully opened, and from fully open to fully closed, the main valve body After the flow path 7 is completely closed by the sub-valve body 8, the communication hole 10 is fully closed by the sub-valve body 3, thereby preventing the water hammer phenomenon caused by the sudden closing of the main valve body 8. In addition, when the main valve body 8 and the sub-valve body 13 are opened, when the main valve body 8 is opened, the locking protrusion 3 of the sub-valve body
5 is locked with the locking recess 38, and when the sub-valve body 13 is opened, the locking protrusion 34 of the main valve system is locked with the locking recess 37,
The sub-valve body 13 and the main valve body 8, which are not opened, are prevented from rattling due to the flow of fluid.

9 and 10A to 10D show another embodiment,
This embodiment is a driven gear member 6 for a main valve body having a driven gear 64 at one end of each of the main valve shaft 6a and the auxiliary valve shaft 11a.
5. A driven gear member 67 for the sub-valve body having a driven gear 66
are fixed via keys 68 and 69, and both valve shafts (13,
An intermediate shaft 7 is connected between the input shaft 23a and the input shaft 23a and parallel to these.
1 is disposed with its upper and lower parts rotatably supported by a rigid case, and the driven gear 64.6 is mounted on this intermediate shaft 71.
An intermediate gear member 74 for the main valve body and an intermediate gear member 7 for the sub valve body each having intermediate gears 72 and 73 meshing with the intermediate gear member 7.
5 and the collar 77.7 so that the position does not shift in the axial direction.
Fixed via 8.79. Rain intermediate gear member 74
．． 75 includes drive gears 25a, teeth 29a of 26a,
Locking recesses 81 and 82 are provided that lock with the locking protrusions 34m and 3fia of the driving gear member 27g when the main valve shaft 6a or the sub-valve shaft l], in which the valve shaft 30a does not mesh with the intermediate gears 72 and 73, do not rotate. There is. Since the configuration of other parts is the same as that of the previous embodiment, similar parts (; are given the same reference numerals with the letter 3 and detailed explanation will be omitted. In this embodiment, the main valve The functions are the same except that the body and the sub-valve body rotate in the opposite direction to open and close the flow path and the communication hole.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the invention. Figure 2 is an enlarged sectional view of the gear parts for the main valve body and the sub valve body,
Figures 3A to 3D are lines A-A, B-B, O- in Figure 2.
0, D-Di: A cross-sectional plan view taken along the line, Figure 4 is a cross-sectional view with both the main valve element and sub-valve element fully closed, and Figure 5 is a cross-sectional view with the main valve element fully closed and the sub-valve element fully open. The plan view, FIGS. 6A to 6D, is a cross-sectional plan view corresponding to FIGS. 3A to 3D in the state shown in FIG. 8 is a cross-sectional plan view corresponding to FIGS. 3A to 3D in the state shown in FIG. 7, FIG. 9 is an enlarged sectional view corresponding to FIG. 2 showing another embodiment of the present invention, and FIG. 9
11 is a cross-sectional side view of the conventional example. 1. Valve box 2... Inlet 3...
Outlet 5.5'...Bearing part 6...Main valve shaft' 7...Flow path 8...Main valve body
]0...Communication hole 1]...Sub-valve shaft
14. $8... Driven gear] 5... Driven gear member for main valve element] 9... Driven gear member for auxiliary valve element 23... Input shaft 25. 26... Drive gear 27...・Drive gear member 29.30...Tooth parts 31, 32...Toothless part 34.35...
Locking protrusion 37.38...Lock recess ff311 diagram

Claims (1)

[Claims] 1. A main valve element that opens and closes a flow path is rotatably disposed in the valve box, and the upstream and downstream sides of the main valve element in the valve box communicate with the main valve element. A communication hole is bored, and a sub-valve element for opening and closing the communication hole is rotatably disposed, a main valve shaft is attached to the main valve element, a sub-valve stem is attached to the sub-valve element, and the main valve stem is rotated. A rotary valve with an auxiliary valve, in which the main valve shaft and the auxiliary valve shaft are arranged such that one end of the main valve shaft and the auxiliary valve shaft protrude outside the valve box so that the auxiliary valve shaft is longer than the other. In the opening/closing device, a driven gear member for the main valve element is fixed to one end of the main valve shaft protruding outside the valve box, and a driven gear member for the auxiliary valve element is fixed to one end of the auxiliary valve shaft. , and an input shaft is disposed parallel to the two valve shafts, and toothed portions that mesh with each of the driven gear members and rotate the main valve body and the sub-valve body by 90 degrees to fully open or fully close the valve body are circumferentially disposed. The drive gear member for the main valve element and the drive gear member for the auxiliary valve element, which are formed in a toothless part formed in a part of the direction and whose outer diameter other than the tooth part has an outer diameter equal to or less than the bottom diameter of the tooth part, are respectively described above. The teeth of both drive gear members are fixed to the input shaft, and the teeth of the drive gear member for the sub-valve element mesh with the driven gear member for the sub-valve element to rotate the sub-valve element 90 degrees from fully closed. The phase is shifted so that the teeth of the driving gear member for the main valve element mesh with the driven gear member for the main valve element after the main valve element is fully opened.
The input shaft is configured to be rotated in the opposite direction after both the main valve body and the auxiliary valve body are fully opened, and the input shaft is axially opposed to the toothless portions of both drive gear members on the input shaft. A first locking member for the main valve body and a first locking member for the auxiliary valve body having locking portions are fixed at the positions where When the main valve shaft is not rotated, the teeth of the drive gear member for the main valve body do not mesh with the driven gear member for the main valve body, at a position axially facing the driven gear member for the main valve body in the A second locking member for the main valve body having a locking portion that locks with the first locking member for the main valve body is fixed, and a second locking member for the secondary valve body at one end of the secondary valve shaft is fixed. At a position facing the driven gear member in the axial direction, when the auxiliary valve shaft is not rotated, the teeth of the drive gear member for the auxiliary valve element do not mesh with the driven gear member for the auxiliary valve element. 1. An opening/closing device for a rotary valve with a sub-valve, characterized in that a second locking member for a sub-valve body having a locking portion that locks with the locking portion of the first locking member is fixed. 2. A main valve element that opens and closes the flow path is rotatably arranged in the valve box, and a communication hole is bored in this main valve element so that the upstream and downstream sides communicate with the main valve element in the valve box. At the same time, a sub-valve body for opening and closing the communication hole is rotatably disposed, and the main valve shaft is rotatably attached to the main valve body, the sub-valve shaft is rotatable to the sub-valve body, and the sub-valve shaft is rotatable to the main valve shaft. Opening/closing of a rotary valve with an auxiliary valve, which is fitted and fixed, and one end of each of the main valve shaft and the auxiliary valve shaft is arranged so as to protrude outside the valve box so that the auxiliary valve shaft is longer than the other. In the device, a driven gear member for the main valve element is fixed to one end of the main valve shaft protruding outside the valve box, and a driven gear member for the auxiliary valve element is fixed to one end of the auxiliary valve shaft, and An input shaft is provided parallel to both valve shafts, and an intermediate shaft is disposed parallel to these between the input shaft and both valve shafts, and the intermediate shaft meshes with the driven gear member for the main valve body. At the same time, an intermediate gear member for the auxiliary valve element that meshes with the driven gear member for the auxiliary valve element is fixed, and the intermediate gear member for the auxiliary valve element that meshes with each of the intermediate gear members and the main valve element and the auxiliary valve element are fixed. The main valve body is formed in a toothless part in which a tooth part that is rotated 90 degrees to fully open or fully close is formed in a part in the circumferential direction, and the outer diameter of the other part is less than the tooth bottom diameter. A driving gear member for the auxiliary valve element and a driving gear member for the auxiliary valve element are respectively fixed to the input shaft, and the tooth portions of both drive gear members are connected to the teeth of the drive gear member for the auxiliary valve element and the drive gear member for the auxiliary valve element. The sub-valve body rotates 90° from fully closed due to engagement with the intermediate gear member.
After the main valve element is rotated and fully opened, the teeth of the driving gear member for the main valve element are out of phase so as to mesh with the intermediate gear member for the main valve element, and the input shaft is connected to the main valve element and the sub-valve element. The main valve is adapted to be rotated in the opposite direction after both valve bodies are fully opened, and has locking portions at positions facing the toothless portions of both drive gear members on the input shaft in the axial direction. A first locking member for the main valve body and a first locking member for the sub-valve body are fixed, and a first locking member for the main valve body and an intermediate gear member for the main valve body on the intermediate shaft are fixed in the axial direction, corresponding to both the first locking members. A locking portion of the first locking member for the main valve body is located at an opposing position when the main valve shaft is not rotated when the tooth portion of the drive gear member for the main valve body does not mesh with the intermediate gear member for the main valve body. A second locking member for the main valve body having a locking portion that locks with each other is fixed, and a driving gear member for the secondary valve body is installed at a position facing the intermediate gear member for the secondary valve body in the axial direction. A sub-valve body having a locking portion that locks with the locking portion of the first locking member for the sub-valve body when the sub-valve shaft is not rotated, the tooth portion of which does not mesh with the intermediate gear member for the sub-valve body. 1. An opening/closing device for a rotary valve with a sub-valve, characterized in that a second locking member is fixed thereto.