JP3021143U - Valve seat surface repair device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] It is desired to provide a small valve seat surface repairing device which can be easily centered and can repair a damaged valve seat surface in a short working time. A rotating handle 56 is joined to one end of a cylindrical shaft 54, and a head 52 is joined to the other end. On the frusto-conical surface of the head, three grooves 65 are formed that are cut in the circumferential direction at equal intervals. A bite 53 is inserted in the groove. The wall of the head defining each groove is provided with an elongated hole 69 extending in parallel to the truncated conical surface by a predetermined length. Each bite is attached to the head by a fixing bolt 67 whose shaft passes through the elongated hole and the bite and is screwed into the head. The shaft has a hole 55a that is concentric with the shaft.
A centering guide 55 having a hole is loosely fitted.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a valve device having a valve body linearly movable with respect to the valve seat along the axis of the valve seat, such as a globe valve or an angle valve. In particular, the present invention relates to a valve seat surface repair device therefor.

[0002]

[Prior art]

 For example, globe valves have been widely used as valve devices to block flow. The valve seat surface on the valve box side of the globe valve may slide and wear due to sliding of the valve body on the valve seat side. Also, in the globe valve used in the plant including elements that handle high-temperature and high-pressure fluid such as boiler, the valve seat surface may be damaged due to erosion. Conventionally, in order to repair such damage on the valve seat surface, a method of recovering the smoothness of the valve seat surface by a sliding operation using a surface plate has been used. That is, the surface is rubbed by applying a polishing compound to the surface to be polished (damaged valve seat surface) and pressing the head of the surface plate from above to slide it. In addition, there were methods such as grinding with a grinding machine and cutting with a combination of special boring machines.

[0003]

[Problems to be solved by the device]

 However, the above conventional method has the following problems. First, with the method of ensuring the smoothness of the valve seat surface by sliding work using a surface plate and the method of grinding with a grinding machine, the repair effect is difficult to appear even if it takes time to repair, and the complete valve It was very difficult to restore to the seat surface. Therefore, when the damage was severe, the valve had to be replaced. Next, regarding the method of cutting with a combination of special boring machines, since the working equipment including the boring machine is large and complicated, it was not suitable as the equipment used for the work performed on site. In addition, setting such as “centering” of the cutting tool before cutting work required high accuracy and was very troublesome. Therefore, an object of the present invention is to provide a small valve seat surface repairing device which can be easily centered and can repair a damaged valve seat surface in a short working time.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a valve seat surface repairing device of the present invention comprises a cutting head simulating the shape of a valve body, and the cutting head that is linear with respect to the valve seat along the axis of the valve seat. A driving means for rotatably rotating the shaft about the axis, and at least one cutting blade for the valve seat extending substantially in the axial direction is arranged on the peripheral surface of the cutting head. It is set up. Further, there are a plurality of the cutting blades, and the position of each cutting blade is adjustable with respect to the axial direction of the cutting head, and the drive means is attached to the cutting head at the lower end and It may consist of a shaft extending in line and a drive handle connected to the upper end of the shaft. Further, the valve device has a valve box in which the valve seat is formed, and is provided in the valve box to guide when the shaft of the drive means moves linearly with respect to the valve seat. It may have a centering guide that is

In the valve seat surface repairing device of the present invention having the above-described structure, first, the cutting blade provided on the cutting head is slidably adjusted to a suitable position. After the cutting blade is aligned, bring it into contact with the valve seat surface. At this time, the centering of the cutting operation is performed by fitting the centering guide with a predetermined portion of the valve device. By turning the drive handle on the upper end of the shaft, the cutting head rotates and the valve seat surface is cut and repaired.

[0006]

[Embodiment of device]

 BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention, that is, embodiments will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or corresponding parts. In FIG. 1, an example of a well-known globe valve is generally indicated by reference numeral 1. The globe valve 1 will be briefly described. Inside the valve box 3, a fluid passage 11 that is a passage through which a fluid flows is defined. As shown in FIG. 1, the fluid passage 11 in the central portion of the valve box 3 bends from the previous horizontal direction to the vertical direction, further bends from the vertical direction, and then flows back to the original horizontal direction. It has a flow path part of such a shape. A frusto-conical valve seat surface 3a is formed in the vertical flow path portion. Above the valve seat surface 3a, there are a valve rod 7 extending vertically through the packing assembly 8a and the packing retainer 8b, and a valve body 5 attached to the lower end thereof. A handle wheel 9 is attached to the upper end of the valve rod 7.

In the globe valve 1, the threaded portion 7 a of the valve rod 7 is screwed into the guide sleeve 6 inserted into the top of the valve lid 4, and the handle wheel 9 is turned to rotate the valve rod 7 and the valve body 5. The valve is opened and closed by moving in the vertical direction. That is, when the valve is closed, the valve seat surface of the valve body 5 and the valve seat surface 3a of the valve box 3 are engaged, the fluid passage 11 is blocked, and when the valve is open, the valve body is closed. The valve seat surface 5 and the valve seat surface 3a of the valve housing 3 are separated from each other so that the fluid can flow into the fluid passage 11.

FIG. 2 is a partial view of the globe valve 1 shown in FIG. 1 in which the valve body 5, the valve rod 7, the handle wheel 9 and the like are removed and the valve seat surface repair device 50 according to the present invention is mounted instead. It is the schematic which expands and shows the globe valve 1. The valve seat surface repair device 50 mainly includes a head 52 to which a bite 53 is attached, a shaft 54, a centering guide 55, and a rotating handle 56. The shaft 54 is a cylindrical member, and projections 57 and 59 are formed on both ends thereof. At the center of the rotating handle 56, a hole 61 having substantially the same shape as the outer shape of the protrusion 57 is formed coaxially. The rotation handle 56 is attached to the shaft 54 by fitting the hole 61 into the protrusion 57.

The head 52 is a member having a cylindrical shape in the upper half portion and a frustoconical shape in the lower half portion, and has a shape simulating the valve body 5. On the columnar side of the head 52, a concave portion 63 having substantially the same shape as the outer shape of the protrusion 59 is formed coaxially. The head 52 is attached to the shaft 54 by fitting the recess 63 into the protrusion 59. A cutting tool 53 is attached to the frusto-conical surface of the head 52 in a manner described later. The number of attached cutting tools 53 is preferably 3 to 5, but in the present embodiment, the following description will be made by taking the case of 3 as an example.

The frusto-conical surface is formed with three grooves 65 that are cut at equal intervals so as to divide the frusto-conical surface into three equal parts in the rotational direction of the head 52. Each groove 65 is formed in the head 52 in such a manner that the depth direction of the groove 65 is substantially perpendicular to the truncated conical surface. One of the cutting tools 53a, 53b, 53c (collectively denoted by reference numeral 53) is inserted into each of the three grooves 65. The wall portion of the head 52 that defines the side wall of each groove 65 is provided with an elongated hole 69 extending in parallel with the truncated conical surface by a predetermined length. Each bite 53 is attached to the head 52 by a fixing bolt 67 whose shaft passes through the slot 69 and the bite 53 and is screwed into the wall of the head 52. The fixing bolt 67 is not limited to a bolt, and may be a screw or something similar as long as the diameter of its shaft portion is smaller than the short diameter of the long hole 69 and its head is larger than the long hole 69. May be. Since the shaft portion of the fixing bolt 67 can move along the long hole 69, the bite 53 attached to the head 52 can also slide along the truncated conical surface. When attached to the head 52, the cutting tool 53 projects from the truncated conical surface by a predetermined length, and the tip of the cutting tool 53 is substantially parallel to the valve seat surface 3a. In addition, the protruding length does not change as the cutting tool 53 slides along the frusto-conical surface.

Around the shaft 54, there is a centering guide 55. A hole 55a having a diameter slightly larger than the outer diameter of the shaft 54 is bored in the center of the centering guide 55 concentrically with the shaft 54. Therefore, the centering guide 55 is slidable along the shaft 54. The packing presser 8b shown in the figure may be used as the centering guide.

Next, the operation of the valve seat surface repair device 50 of the present invention will be described. In the head 52 of the present embodiment, the entire surface of the valve seat surface 3a can be cut and repaired in a short time by sliding the cutting tools 53a, 53b, 53c along the groove and aligning the positions with each other. it can. For example, as shown in FIGS. 3A, 3B, and 3C, the width of each of the three bits 53a, 53b, and 53c is X (bit width X), and the target valve seat surface is When the width of 3a is Y (valve seat width Y), and X = 6 mm and Y = 5 mm, first, regarding the position of the first cutting tool 53a, as shown in (a) of FIG. When the tool bit 53a is pressed against the valve seat surface 3a, the lower part 3mm of the tool bit width X of the tool bit 53a indicated by the symbol A comes in contact with the upper part 3mm of the valve seat width Y of the valve seat surface 3a. Sliding together. Next, as for the position of the second cutting tool 53b, as shown in FIG. 3 (b), the upper 4 mm indicated by the symbol B of the cutting tool width X of the cutting tool 53b is the valve seat width Y of the valve seat surface 3a. Of these, the byte 53b is slidably aligned so as to come into contact with the lower side 4 mm. Further, the position of the third bite 53c is, as shown in (c) of FIG. 3, of the bite width X of the bite 53b, which is indicated by the symbol C. The upper 5 mm is the entire valve seat width Y of the valve seat surface 3a, The bite 53c is slidably aligned so as to come into contact with the entire 5 mm portion. Incidentally, with respect to the cutting tool 53c, the lower 5 mm of the cutting tool width X may be brought into contact with the entire valve seat width Y. By aligning the positions of the cutting tools 53a, 53b, 53c as described above, it becomes possible to uniformly cut the entire surface of the valve seat surface 3a.

When the positioning of the cutting tool 53 is completed, the valve seat surface repair device 50 is set on the globe valve 1. Prior to the work of repairing (cutting) the valve seat surface, the valve body 5 and the valve rod 7 are removed from the globe valve 1. The head 52 and the shaft 54 of the valve seat surface repair device 50 are inserted into the region where the valve body 5 and the valve rod 7 were inserted. At this time, the centering guide 55 of the valve seat surface repair device 50 is fitted with a predetermined portion of the globe valve 1, and the centering guide 55 centers the shaft 54 and the head 52 with respect to the valve seat surface 3a. Done. Then, when the turning handle 56 of the valve seat surface restoration device 50 is rotated with the cutting tools 53a, 53b, 53c of the head 52 in contact with the valve seat surface 3a, as described above, the entire surface of the valve seat surface 3a is Is evenly cut. In this way, the valve seat surface 3a with the gradient angle and accuracy secured is repaired.

The present invention described in the above embodiment can be applied to valve devices having various types of valve seat surfaces by preparing several kinds of cutting tools and heads and combining them. . Regarding the way of rotating the head, in the case of a small-diameter globe valve, the rotating handle 56 may be manually turned as in the present embodiment, but in some cases, a low-speed rotating air motor may be used instead of the manual operation. You may turn it.

[0015]

[Effect of device]

 As described above, according to the valve seat surface restoration device of the present invention as set forth in claim 1, a cutting head simulating the shape of the valve body, and the cutting head is provided along the axial center of the valve seat. And a drive means for rotatably linearly rotating around the axis, and the cutting blade for the valve seat, which extends substantially in the axial direction, is provided on the peripheral surface of the cutting head. Since one of them is provided, the valve seat surface can be easily restored to the shape having the inclination angle suitable for the engagement with the valve body.

According to the valve seat surface restoration device of the second aspect, since there are a plurality of the cutting blades and each cutting blade is positionally adjustable in the axial direction of the cutting head, the entire valve seat surface can be adjusted. The surface can be cut uniformly at one time, and the repair work time is reduced to a fraction of that of the conventional method.

According to another aspect of the valve seat surface repair device of the present invention, the drive means is attached to the cutting head at the lower end, and has a shaft extending linearly with the shaft center and an upper end of the shaft. Since the drive handle is connected to, the valve seat surface is cut by manually rotating the drive handle, so that the device can be downsized, which is suitable for field work.

According to the valve seat surface restoration device of the fourth aspect, the valve seat surface restoration device is provided in the valve box for guiding the shaft of the drive means when moving linearly with respect to the valve seat. Since the centering guide is provided, the centering can be easily performed, and the repair work time is shortened to a fraction of that of the conventional one. Moreover, since the device can be downsized, it is suitable for on-site work.

[Brief description of drawings]

1 is a cross-sectional view of a globe valve having a valve seat surface that is repaired by the valve seat surface repair device of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a part of a valve box including a valve seat surface and a valve seat surface repair device of the present embodiment.

FIG. 3 is an explanatory view showing a positional relationship between a cutting tool and a valve seat surface.

[Explanation of symbols]

1 ... Globe valve (valve device), 3 ... valve box, 3a ... valve seat surface,
5 ... Valve body, 52 ... Head (cutting head), 50 ... Valve seat surface repair device, 53 ... Bit (cutting blade), 54 ... Shaft (driving means), 55 ... Centering guide, 56 ... Rotation handle ( Drive handle, drive means).

Claims (4)

[Scope of utility model registration request] 1. A valve seat surface repair device for a valve device having a valve element linearly movably arranged along an axis of a valve seat, the cutting simulating the shape of the valve element. A head and drive means for rotating the cutting head linearly movably with respect to the valve seat along the axis of the valve seat about the axis, and on a peripheral surface of the cutting head. A valve seat surface repair device, wherein at least one cutting blade for the valve seat is disposed on the valve seat and extends substantially axially. 2. The valve seat surface repair device according to claim 1, wherein there are a plurality of cutting blades, and the position of each cutting blade is adjustable in the axial direction of the cutting head. 3. The drive means comprises a shaft attached to the cutting head at the lower end and extending in line with the axis, and a drive handle connected to the upper end of the shaft.
Alternatively, the valve seat surface repair device according to item 2. 4. The valve device has a valve box in which the valve seat is formed, and the valve box is provided in the valve box for guiding when the shaft of the drive means moves linearly with respect to the valve seat. 4. The valve seat surface repair device according to claim 3, comprising a centering guide adapted to be provided.