JPS628690Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field This invention relates to a device for adjusting the pressing force of a valve box valve seat in a bearing portion of a butterfly valve.

(2) Prior Art Conventionally, the device shown in FIG. 1 is known as this type of pressure adjustment device for a valve box valve seat. A cylindrical part 4 is provided at the lower part of the valve box 1, and a vertical valve shaft 3, which has a valve body 2 fixed to the inner part of the valve box, can be freely rotated around the axis of the cylindrical part 4. An elastic valve box valve seat 10, which slides into contact with the outer circumferential edge of the valve body 2 when the valve is closed, is inserted into the annular gap with an annular gap between the inner surface of the part 4 and a press ring 9 to the outer circumferential edge side of the valve body 2. A hollow cylindrical pressing member 6 having an opening at the upper end is slidably inserted in the axial direction of the valve shaft 3 so that its lower end protrudes from the lower end surface of the cylindrical portion 4. Pressing member 6
also serves as a bearing member, and its lower end is closed, and a flange 5 is provided on the outer periphery of the lower end. An adjustment bolt 7 whose tip threaded portion is threaded into a screw hole drilled in the lower end surface of the cylindrical portion 4 is attached to a through hole formed in the flange 5, and the bolt 7 connects the flange 5 and the cylindrical portion. By adjusting the distance between the valve body and the lower end surface of the valve body 4, the pressing force of the valve box valve seat 10 by the pressing member 6 can be adjusted. Further, an adjustment bolt 8 whose tip supports the lower end surface of the valve shaft 3 is screwed into a nut provided with a through hole in the center of the lower end surface of the pressing member, and by adjusting the threading of the adjustment bolt 8, the valve shaft is adjusted. The vertical position of 3 in the axial direction can be adjusted.

(3) Problems to be solved by the invention By the way, in the above-mentioned pressing force adjusting device, when adjusting the pressing force of the valve body valve seat 10 with the adjusting bolt 7, first the adjusting bolt 8 is moved back and then the valve is adjusted. After disengaging the shaft 3 from the lower end surface, adjust the distance between the flange 5 and the lower end surface of the cylindrical portion 4 using the adjustment bolt 7, and then adjust the adjustment bolt 8 again to adjust the distance between the valve shaft 3 and the lower end surface of the valve shaft 3. It is necessary to engage the lower end surface and return the vertical position of the valve shaft 3 in the axial direction to its original position. This is because, in the above device, the adjustment bolt 8 is attached to the same pressing member 6 as the adjustment bolt 7, and if the adjustment bolt 8 is left in the same state when operating the adjustment bolt 7, the valve stem 3 will be pressed. Following the sliding of member 6, it slides at the same time,
This is because the vertical position of the valve shaft 3 in the axial direction changes. Therefore, in order to adjust the pressing force of the valve box valve seat 10, it is necessary to operate the adjustment bolt 8 in addition to the operation of the adjustment bolt 7, and the work associated with adjustment is troublesome. There was a problem that the work required a long time.

Therefore, this invention has developed a technology to make the adjustment bolt 8 independent from the pressing member so that the pressing force on the valve box valve seat 10 can be adjusted only by the adjustment bolt 7 without operating the adjustment bolt 8. This will be a major issue.

(4) Means for solving the problem The technical means taken to solve the above technical problem is to make the lower end of the valve shaft penetrate the lower end of the pressing member and protrude to the outside. A bearing member which is not provided and which is separate from the pressing member and supports the lower end surface of the valve shaft is arranged, and the distance between the bearing member and the lower end surface of the cylindrical part is adjusted. Particularly, a second adjustment member is provided which can adjust the vertical position of the valve shaft in the axial direction.

(5) Function As mentioned above, the second adjusting member for adjusting the vertical position of the valve stem in the axial direction is separate from the pressing member provided with the adjusting member for adjusting the pressing force on the valve box valve seat. Since the bearing member is provided between the bearing member and the lower end surface of the cylindrical portion, the distance between the flange of the pressing member and the lower end surface of the cylindrical portion can be adjusted by operating only the adjusting member without operating the second adjusting member. This allows the pressing member to slide to adjust the pressing force on the valve seat of the valve box. In this way, since only the adjustment member needs to be operated, the adjustment work can be performed easily and quickly with good workability.

(6) Effects of the device This device has the following unique effects. The lower end of the valve shaft passes through the lower end of the pressing member and protrudes to the outside, and the protruding lower end surface of the valve shaft is supported by a bearing member, and the wear status of the bearing part of the bearing member is monitored externally. Since the degree of wear can be visually observed, it is possible to adjust the valve stem support condition to the appropriate one or to easily determine the replacement of parts. Therefore, it is possible to maintain a constant pressing force on the valve seat of the valve body at all times. can be retained. Further, even if the fluid inside the pipe leaks through the bearing, the bearing member and the adjustment member will not be soaked by this fluid, so rust will not occur, and adjustment will not become impossible.

(7) Embodiment In FIGS. 2 to 6, 21 is a valve box, 22 is a valve body 23 fixed to the inside of the valve box, and rotatably inserted into the cylindrical parts provided above and below the valve box 21. 24 is an annular elastic valve box valve seat fixed to the valve box 21 via a clasp 25, and the outer circumferential edge of the valve body 23 is in sliding contact with the valve box seat 24 to open a flow path. 26 and channel 27
It is designed to open and close between the two. 28 is an upper cylindrical part provided at the upper part of the valve box, 29 is a lower cylindrical part provided at the lower part of the valve box, and 30 is a hollow cylindrical pressing member which also serves as a bearing member and is fitted into the lower cylindrical part 29. The pressing member 30 includes a cylindrical portion 31 with open upper and lower ends that is fitted into an annular gap formed between the inner surface of the cylindrical portion 29 and the valve shaft 22, and a flange provided on the outer periphery of the lower end of the cylindrical portion 31. 32, with the lower end of the valve shaft 22 protruding from the lower ends of the cylindrical portion 29 and the cylindrical portion 31. A bushing 33 is disposed between the inner circumferential surface of the cylindrical portion 31 and the outer circumferential surface of the valve shaft 22.
A packing 34 is attached to the inner circumferential surface of the lower end of 1 by a packing presser 35. 36 is the flange 32
A plurality of adjustment bolts are installed in through holes drilled in the cylindrical portion 29, and the threaded ends of the bolts are screwed into screw holes drilled in the lower end of the cylindrical portion 29, and by operating the bolts 36, The distance between the flange 32 and the lower end surface of the cylindrical portion 29 is adjusted, and the sliding pressing member 30 is inserted into the valve shaft 22 so that the upper end surface of the pressing member 30 comes into contact with the pressing member 30. ring 37
The pressing force of the valve box valve seat 24 against the outer peripheral edge of the valve body 23 can be adjusted through the valve body valve seat 24. 38 is a bearing member disposed below the pressing member 30. A thrust member 39 is mounted in a recess formed in the center of the surface of the bearing member 38, and the lower end surface of the valve shaft 22 protruding from the lower end of the pressing member 30 is supported by the member 39. are doing. 40 is an adjustment bolt screwed into a fixing nut 41 provided with through holes at both ends of the bearing member 38, and its tip threaded portion is screwed into a threaded hole drilled in the lower end surface of the cylindrical portion 29, By operating the bolt 40, the distance between the bearing member 38 and the lower end surface of the cylindrical portion 29 can be adjusted, thereby adjusting the vertical position of the valve shaft 22 in the axial direction.

43 is a pressing member fitted into the upper cylindrical portion 28;
44 is a bushing, 45 is a pressure ring, 46 is a seal, and 47 is a seal holder.

Next, the operation of the above embodiment will be explained.

The adjustment bolt 36 is operated to adjust the distance between the flange 32 of the pressing member 30 and the lower end surface of the cylindrical portion 29, and thereby the pressing member 30 is slid in the axial direction of the valve shaft 22, and the pressing ring 37 The pressing force applied to the outer circumferential edge of the valve body 23 by the valve seat 24 of the valve body is adjusted through the valve body. Also, by operating the adjustment bolt 40, the shaft bearing member 38
and the lower end surface of the cylindrical portion 29, thereby adjusting the valve shaft 2 whose lower end surface is supported by the bearing member.
2 in the axial direction to adjust the vertical position of the valve shaft 22 in the axial direction. When making these adjustments, since the adjustment bolts 36 and 40 are each attached to separate members, only one of them can be operated independently and the other does not need to be operated.

In the embodiment, the distance between the flange 32 of the pressing member 30 and the lower end surface of the cylindrical portion 29 is adjusted using the adjusting bolt 36.
In this case, the distance between the bearing member 38 and the lower end surface of the cylindrical portion 29 is adjusted using the adjustment bolt 40, but this is only an example, and other adjustment members with the same effect other than the bolt may be used. Needless to say, it is good to
Further, the mounting members for the bolts 36, 40 and the member having the screw hole into which the threaded end portion is threaded may be reversed.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of the main part of the conventional structure, Fig. 2 is a front view of the embodiment of this invention, and Fig. 3 is Fig. 2-
The bottom view along the line, Figure 4 is the same side view as above, Figure 5 is the same as above.
The figure is an enlarged sectional view of the main part of the same as the above, and FIG. 6 is a cross-sectional plan view of the main part of the same. 21...Valve box, 22...Valve shaft, 23...Valve body,
24... Valve box valve seat, 29... Lower cylindrical part, 30...
...Press member, 31...Cylinder part, 32...Flange,
36, 40... Adjustment bolt, 37... Pressing ring, 38... Bearing member.

Claims (1)

[Scope of utility model registration request] A cylindrical part is provided at the bottom of the valve box, and a vertical valve shaft with a valve body fixed to the inner part of the valve box is fitted into this cylindrical part so as to be rotatable around its axis and with an annular gap between it and the inner surface of the cylindrical part. Insert into the annular gap a hollow cylindrical pressing member with an open upper end that presses an elastic valve box valve seat that slides against the outer periphery of the valve body toward the outer periphery of the valve body when the valve is closed; A flange is provided on the outer periphery of the lower end of the pressing member, and a flange is provided between the flange and the lower end face of the cylindrical part, so that the pressing member is slidably inserted in the axial direction of the valve shaft so as to protrude from the lower end face of the pressing member. In the device for adjusting the pressing force of a valve box valve seat in a bearing part of a butterfly valve, which is provided with an adjusting member that can adjust the pressing force of the pressing member on the valve box valve seat by adjusting the interval, the lower end of the valve shaft. A bearing member is disposed that protrudes outward through the lower end of the pressing member and is separate from the pressing member and supports the lower end surface of the valve shaft, and this bearing member and the cylinder A bearing part for a butterfly valve, characterized in that a second adjusting member is provided between the lower end surface of the shaped part and the second adjusting member can adjust the vertical position of the valve shaft in the axial direction by adjusting the interval between the two. Pressure force adjustment device for the valve seat of the valve box.