JP3212163B2 - Butterfly valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve for opening and closing a flow passage by turning a circular valve plate adapted to a flow opening in a valve box around a diametrical axis.

[0002]

2. Description of the Related Art A butterfly valve of this type has the advantages of simple operation and low flow resistance. However, when trying to stop the valve plate of the butterfly valve at an intermediate position between full open and full close in order to adjust the flow area, the valve plate is constantly subjected to a variable forcing force due to the flow of fluid. Therefore, means for positively fixing the valve plate is required. Conventionally, as such a fixing means, a stop plate having a plurality of engagement recesses on an outer peripheral surface and fixed to a valve box side, and a stop plate which can be engaged with the engagement recess of the stop plate, is held on a handle side. And a stop lever.

[0003]

However, with this conventional fixing means, the position of the valve plate is fixed only at a series of predetermined positions where the stop lever engages with the engaging recess of the stop plate. It has not always been possible to accurately set and maintain the desired flow area, ie the desired pivot position of the valve plate.

The present invention has been made in view of such a problem, and a valve plate can be fixed at an arbitrary turning position so that a desired flow area of a butterfly valve, that is, an arbitrary valve opening degree can be obtained. The goal is to always be able to set and maintain the correct.

[0005]

In order to achieve the above object, a butterfly valve according to the present invention is provided with a valve stem 3 fixed to a valve plate 1 at an upper end protruding outside the valve box, and a valve stem 2 attached to a valve box 2. A cylindrical cylinder having a diameter larger than that of the valve rod 3 that cooperates with a fixed stopper pin 24 to limit the turning angle of the valve plate 1 within a predetermined range
Stopper 17 having a fan-shaped recess 30
And a handle 18 for turning operation is respectively fixed, and the handle 18 is larger than the stopper 17.
A recess 36 having a diameter is provided in a downward direction.
Cylindrical stopper ring held non-rotatably in box 1
19 surrounding the peripheral wall portion 21 and the stopper
Ring 19 is provided with an inward edge 20 which
20 so that the cylindrical stopper 17 slides into it
And locked from outside to inside of the handle 18
The screw 37 is screwed in, and the front end face of the lock screw 37 is
The stopper ring 19 comes into contact with the peripheral wall portion 21 and
Topper ring 19, stopper 17, handle 18
However, they are characterized in that they can be fastened and fixed to each other at an arbitrary turning position by the lock screw 37.

[0006]

After the valve plate 2 is turned to a desired turning position through the handle 18 and the valve rod within a predetermined turning angle range limited by the stopper 17, the lock screw 3
When the lock screw 37 is tightened, the stopper ring 19, the stopper 17,
The dollars 18 are non-rotatably fixed to each other. In this case, the valve
A stopper ring 19 that is immovable with respect to the box 2
It has a peripheral wall 21 having a larger diameter than the upper 17,
The front end face of the lock screw 37 abuts on the peripheral wall 21.
As a result, the arm length between the point of action and the axis
And the fixing torque by the lock screw 37 increases,
Even with the small tightening force of the
Fixation becomes possible. According to this configuration, the stopper
The lock screw 37 and the peripheral wall 21 of the ring 19 are sandwiched.
And the fan-shaped recess 30 for restricting rotation and turning is substantially opposed.
The thickness of the butterfly valve in the vertical direction can be reduced,
The structure can be made compact.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIGS. 1 and 2, a substantially circular valve plate 1 of a butterfly valve is rotatably supported through a valve rod 3 inside an annular valve box 2. In the valve plate 1,
An insertion hole 4 extending in the diameter direction is formed, and the valve stem 3 passes through the insertion hole 4. The valve stem 3 and the valve plate 1 are connected by a plurality of bolts 5 crossing both. In this case, a relatively large hole 6 capable of accommodating the head of the bolt 5 is formed in the wall of the valve plate 1 surrounding the insertion hole 4, and a male screw portion of the bolt 5 is screwed into a position facing the hole 6. Each of the female screws 7 is formed, and a relatively small hole 8 through which the bolt 5 penetrates is formed in the valve stem 3. Further, on the outer peripheral surface of the valve plate 1, a groove 9 is formed over the entire circumference in order to ensure the sealing performance when the valve is closed, and the O-ring 10 is accommodated in the groove 9. .

The valve stem 3 protrudes outside at one end through the valve box 2 to operate the valve stem 3 and the valve plate 1. In this case, a plurality of lands 12 are formed at small intervals on the outer peripheral surface of the valve stem 3 located in the through hole 11 provided in the valve box 2, and a seal ring 13 is provided between the lands 12. Is housed. The through hole 11 of the valve box 2 has a brass 2 for preventing galling.
Two bushes 14 are mounted so as to surround the valve stem 3 and sandwich the land 12 therebetween. Furthermore, valve stem 3
Is slightly protruded from the valve plate 1 also at the lower end, and is rotatably supported in the support hole 16 of the valve box 2 with the protruding portion 15.

A protruding portion of the valve stem 3 protruding outside the valve box 2 has a stopper 17 for operation and a handle 18.
Has been fixed. A stopper ring 19 is non-rotatably held by the valve box 2 so as to be positioned concentrically with respect to the stopper 17 and the handle 18. The stopper ring 19 has a cylindrical peripheral wall 21 provided with an inward edge 20 which is in sliding contact with the outer peripheral surface of the cylindrical stopper 17, and is adjacent to the peripheral wall 21 and also slidably contacts the bottom surface of the stopper 17. The bottom wall 22 has a disk shape.
The stopper ring 19 is provided with a central through hole 23 for a protruding portion of the valve stem 3 and an engagement hole 25 for a stopper pin 24 implanted in the valve box 2. That is, the stopper ring 19 cannot be rotated with respect to the valve box 2 by the stopper pin 24 engaged with the engagement hole 25. Note that the stopper ring 19 is preferably made of brass in consideration of sliding contact with the stopper 17.

A stopper 17 having a cylindrical outer shape, partially housed in a stopper ring 19, comprises an axial through hole 26 for the valve stem 3 and a fixing screw abutting against a plane 27 of the valve stem 3. Radial internal thread 29 for 28
And a fan-shaped concave portion 30 extending over a range of approximately 90 °. As shown in FIGS. 3 and 4, the stopper pin 24 protrudes into the sector-shaped concave portion 30 located on the bottom surface of the stopper 17.
Then, by contacting both end walls of the sector-shaped concave portion 30,
The turning angles of the stopper 17 and the valve plate 1 are limited to approximately 90 °. That is, the stopper pin 24 implanted in the valve box 2 prevents the rotation of the stopper ring 19 and also restricts the turning angle of the stopper 17 and the valve plate 1.

Stopper 17 and stopper ring 19
The handle 18 mounted thereon comprises a radial female screw 32 for a fixing screw 31, a radially and obliquely upward female screw 34 for a grip 33, and a stopper 17.
And a relatively large cylindrical recess 36 for accommodating the stopper ring 19. That is, the handle 18
It is connected to the stopper 17 via a fixing screw 31. Further, the relatively large recess 36 of the handle 18
A female screw 39 into which the male screw portion 38 of the lock screw 37 is screwed is provided on the peripheral wall portion surrounding the. The distal end surface of the male screw portion 38 of the lock screw 37 comes into contact with the outer peripheral surface of the stopper ring 19 by tightening the lock screw 37.

In the butterfly valve having such a configuration,
When operating the valve plate 1 via the grip 33 or the handle 18, the rotation angle range of the valve plate 1 is determined by the stopper pin 24.
Is limited to approximately 90 ° by the cooperation of the fan 17 and the fan-shaped recess 30 of the stopper 17. Within this turning angle range, the valve plate 1 is moved to the handle 18, the stopper 17 and the valve stem 3.
When the lock screw 37 is tightened with respect to the stopper ring 19 after turning to the desired turning position via the, the frictional connection between the distal end surface of the male screw portion 38 of the lock screw 37 and the outer peripheral surface of the stopper ring 19 is established. As a result, the lock screw 37, that is, the handle 18 is non-rotatably fixed to the stopper ring 19. Therefore, the valve plate 1 is reliably held at an arbitrary valve opening, and a desired flow area is maintained.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration of the present invention is not limited to this. For example, the stopper 17 and the handle 18 may be an integral member.

According to the present invention, within the predetermined turning angle range limited by the stopper 17, the valve plate 2
The handle 18 and through the valve stem after being rotated to a desired pivoted position, tightening the Rokkubisu 37, the clamping action of the Rokkubisu 37, the stopper ring 1
9. Stopper 17 and handle 18 cannot rotate with each other.
Fixed. In this case, a stopper that is immovable with respect to the valve box 2
Ring 19 has a larger diameter than the large stopper 17.
The peripheral wall 21 has a lock screw.
Since the front end face of the 37 abuts, the point of action and shaft
The arm length with the heart can be greatly increased,
The constant torque increases and the lock screw 37 is tightened slightly.
The turning position can also be fixed by the applied force. Also book
According to the configuration, the peripheral wall portion 21 of the stopper ring 19 is sandwiched.
The lock screw 37 and the sector-shaped concave portion 3 for turning restriction
0 is almost opposite, so the butterfly valve
The thickness in the direction can be reduced, and the structure can be made compact.
You.

[0016]

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a butterfly valve of the present invention.

FIG. 2 is a longitudinal sectional view of the embodiment.

FIG. 3 is a perspective view of the stopper viewed from below.

FIG. 4 is a bottom view of the stopper.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Valve plate 2 Valve box 3 Valve rod 4 Insertion hole 5 Bolt 6 Hole 7 Female screw 8 Hole 9 Concave groove 10 O ring 11 Through hole 12 Land 13 Seal ring 14 Bush 15 Projection 16 Support hole 17 Stopper 18 Handle 19 Stopper ring 20 Edge 21 Peripheral wall part 22 Bottom wall part 23 Center through hole 24 Stopper pin 25 Engagement hole 26 Through hole 27 Uneven plane 28 Fixing screw 29 Female screw 30 Sector-shaped concave part 31 Fixed screw 32 Female screw 33 Grip 34 Female screw 35 Recessed part 36 Recessed part 37 Lock screw 38 Male thread part 39 Female thread

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 35/00-35/16 F16K 1/16-1/226

Claims (1)

(57) [Claims] 1. A butterfly valve which opens and closes a flow path by turning a circular valve plate 1 adapted to a flow opening in a valve box 2 around an axis in a diametric direction, and is fixed to the valve plate 1. the upper end portion that protrudes valve body outside of the valve rod 3, which is, the valve for limiting the turning angle of the valve plate 1 in cooperation with the stopper pin 24 fixed to the valve box 2 within a predetermined range
A cylindrical, fan-shaped recess 30 having a larger diameter than the rod 3
Handle 1 of the stopper 17, since the turning operation having
8 are fixed to each other, and the handle 18 is attached to the handle 18.
A recess 36 having a diameter larger than that of the upper 17 is provided downward.
And a cylinder held in the recess 36 so as to be non-rotatable by the valve box 1.
When the peripheral wall 21 of the stopper ring 19 is surrounded
In both cases, the stopper ring 19 has an inward edge portion 20.
A cylindrical stopper 17 is provided in the edge 20.
Are stored so as to be in sliding contact with each other.
A lock screw 37 is screwed in from the outside to the inside, and this lock
The front end face of the screw 37 is a peripheral wall of the stopper ring 19.
The stopper ring 19 and the stopper
17. A butterfly valve characterized in that the handle 18 can be fastened and fixed to each other at an arbitrary turning position by the lock screw 37.