JP2000081152A - Inclination type butterfly valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inclination type butterfly valve to simply replace a seal part being serious in corrosion and wear from the end part of a valve body. SOLUTION: A valve stem 4 and a valve element 3 are formed into one body inseparably, the part, from an upper mounting hole 5, of a flow passage 2, formed into a cantilever structure, and rotatably mounted. A seal part comprises the valve element 3 and the valve seat link 6. Besides, the valve seat ring 6 is formed in a manner to be mounted and removed through the outlet end surface 7 of a valve body 1 and this constitution enables replacement of the seal part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inclining butterfly valve in which a seal portion, which is severely corroded and worn, can be easily replaced from an end of a valve body.

[0002]

2. Description of the Related Art A tilt-type butterfly valve (butterfly valve) is already known in principle. FIG. 1 shows a typical structure thereof, and an outline of the structure of a conventional structure will be described with reference to FIG. The valve element (42) positioned at a right angle to the flow path (41) when closed has a seal (43) on the circumference that is in close contact with the inner surface of the flow path (41). The rotatable valve shaft having a fixed angle to the valve body (42) supports the valve body (42) from both upper and lower directions, so that the upper valve shaft (44) and the lower valve shaft (45).
And an upper mounting hole (47) and a lower mounting hole (48) with respect to the valve body (46), respectively, for restraining the axial movement of the valve shaft. It is composed of seal portions (51) and (52). Therefore, in order to replace the seal (43), the upper valve shaft (44) and the lower valve shaft (45) are removed, and the valve body (42) is connected to the end surface portion (53) or (5) of the valve body (46).
4), the seal (43) was removed from the valve body (42) and replaced.

[0003]

The technical problems with the conventional tilting butterfly valve are as follows. (B) Problem 1: Replacement of each valve assembly and provision of spare parts are required, resulting in high cost. In the conventional valve, to replace the seal (43), the valve assembly is removed from the pipe, and the upper valve shaft (44) and the lower valve shaft (45) are disassembled from the valve body (46). A valve element (42) disassembled from the end faces (53) and (54) of the flow path (41)
, And the seal (43) is removed from the valve body (42). Also, when assembling again, the reverse procedure is required, and considerable assembly skills and assembly man-hours are required. Have difficulty.
Therefore, when the seal (43) is replaced, the entire valve assembly is replaced completely, so that it is necessary to keep the valve assembly as a supplementary part, which increases the cost and management of the user. However, at a site where a corrosive liquid is handled, liquid leakage from the valve due to corrosion and abrasion of the seal portion occurs daily, which is a problem. (B) Problem 2: The seal cannot be replaced unless the valve shaft and the valve element are disassembled separately. The conventional valve has a structure in which the seal (43) cannot be attached unless the valve body (42), the upper valve shaft (44), and the lower valve shaft (45) are separately configured. For this reason, the structure is very complicated, it is difficult to center the upper valve shaft (44) and the lower valve shaft (45), and the manufacturing cost is high, such as an increase in the number of assembly steps. . (C) Problem 3: The valve has a large flow resistance. Valve body (42)
Since the upper valve shaft (44) and the lower valve shaft (45) protrude into the flow path (41) around the center, the area of the valve element and the valve shaft occupying a large cross-sectional area of the flow path is large, and the passage area of the fluid , The flow resistance increases. (D) Problem 4: The space for mounting the valve is large. For the valve element (42) perpendicular to the flow path (41), the upper valve shaft (4
4) and the lower valve shaft (45) intersect at an angle, so that the end face (5) of the valve body (46) is formed.
As a result of the lengthening of the interval between 3) and (54), the valve body becomes large, so that the space for installation in the piping and the weight of the valve also increase. (E) Problem 5: Foreign matter is easily caught in the valve shaft. In the conventional valve, the valve element (42) is supported and constituted by both the upper valve shaft (44) and the lower valve shaft (45). Particularly, in the case of a liquid having a large amount of residue, the lower valve shaft (45) and the mounting hole are formed. (48)
Foreign matter remaining in the gap between the two is easy to bite, and there are many causes of poor sealing

[0004]

The invention according to claim 1 will be described with reference to FIG. 2 corresponding to the embodiment. (A) A circular plate-shaped valve element (3) orthogonal to the flow path (2) when the valve is closed is provided for the cylindrical flow path (2) provided in the valve body (1). (B) The valve shaft (4) is rotatably attached to the flow path (2) at a certain angle Θ. (C) Only one mounting hole (5) for the valve shaft (4) is provided in the circumferential direction of the flow path (2) at an angle Θ with respect to the flow path (2). (D) The valve body (3) and the valve shaft (4) are integrally inseparable. (E) Means for restraining the axial movement of the valve shaft (4) with respect to the valve body (1) is provided. (F) When the valve is closed, a valve seat ring (6) that closes the flow path (2) in close contact with the circumferential side of the valve element (3) is provided at right angles to the flow path (2) and the valve shaft (4). Is provided at a position that does not interfere with the mounting hole (5). (G) The valve seat ring (6) is configured to be detachable from the end face (7) of the valve body (1) perpendicular to the flow path (2).

The invention of claim 2 will be described with reference to the reference numerals in FIG. 5 corresponding to the embodiment. When the structure of the valve is configured as in claim 1, the following is possible. As shown in FIG. 5, the inlet end face (25) is set to α with respect to the outlet end face (7).
Even if the valve main body (24) is configured to be inclined at an angle, no trouble occurs. With this configuration, the weight of the valve itself can be reduced. Further, if this valve is provided at the pipe end, the pipe end can be inclined downward, so that the hose can be bent more easily when the hose is attached. Therefore, it is possible to facilitate the work of installing the hose, and at the same time, to reduce the load on the pipe terminal by the hose.

A third aspect of the invention is a butterfly valve which is made possible when the structure of the valve is configured as in the first and second aspects, and which allows the inside of the valve to be sufficiently seen through. That is, the valve body (1) of claim 1 and the valve body (24) of claim 2 are made of a transparent or translucent material, and in the state of a closed valve, the inlet end faces (18), (25). The present invention provides a butterfly valve that allows the inside of the valve to be viewed by utilizing the unique large space created between the outlet end face (7) and the outlet end face (7).

[0007]

An embodiment of the first aspect of the present invention will be described with reference to FIG. When closed, the flow path (2) is closed to the cylindrical flow path (2) provided in the valve body (1).
And a disc-shaped valve element (3) orthogonal to. Further, the valve shaft (4) is rotatably mounted at a certain angle に 対 し て with respect to the flow path (2). Mounting hole (5) for valve shaft (4)
Is provided at only one location in the circumferential direction of the flow path (2). Therefore, the mounting hole (5) also has an angle of Θ with respect to the flow path (2). The valve element (3) and the valve shaft (4) are integrally formed. Therefore, the center of the valve shaft (4) and the center of the valve body (3) form an angle of 90 ° -Θ °. What is inseparable?
It means that it is integrally formed depending on whether it is a welded structure or a cast structure, and is constructed so that it cannot be disassembled after assembly like a bolted structure. A stop plate boss (8) is provided above the valve shaft (4), and a handle mounting square boss (9) is provided above the stop plate boss (8). A stop plate (10) is mounted on the stop plate boss (8), and a rectangular spigot (12) for mounting a handle (11) is mounted on the stop plate (10), and the handle (11) is mounted by an embedding bolt (13).
Are fastened to the handle mounting square boss (9). Therefore, when the stopper plate (10) is attached to the valve body (1) by the bolt (14), the downward movement of the valve shaft (4) is restrained by the port (13) and the handle (11). The upward movement of the valve shaft (4) is restrained by the bolt (14) and the stopper plate (10). The degree of contact of the valve element (3) with the valve seat link (6) is adjusted by shims (15) and (16) inserted above and below the stop plate (10). Further, the stopper plate (10) also serves to hold the valve shaft seal (17). When the valve element (3) closes the flow path (2), a valve seat ring (6) that closes the flow path (2) in close contact with the circumferential side of the valve element (3) is connected to the flow path (2). And at a position that does not interfere with the mounting hole (5) of the valve shaft (4).
The inlet end face (18) and the outlet end face (7) of the flow path (2) of the valve body (1) have a flat flange mounting surface perpendicular to the flow path (2). At the time of installation to piping, the inlet end face (1
A packing (19) and a flange (20) are attached to 8), but the sealing portion (21) of the valve seat ring (6) also serves as a sealing of the end surface portion on the outlet end surface (7). It becomes unnecessary.

The valve seat link (6) that contacts and seals with the valve body (3) includes, as an embodiment thereof, FIGS.
3-3, and the like. Valve seat ring (6) shown in FIG.
Is an example of the same configuration as FIG. FIG. 3-1 shows an example in which the entirety of the valve seat ring (60) is a sealing material, and is constituted by a sealing portion (74) and a cushion portion (75). In this case, no packing is required for the mating flange (62) in contact with the end surface (61), and the valve seat ring (60) also serves as a seal for the flange portion. Figure 3-
2 shows an example in which the valve seat ring (63) is constituted by a seal portion (64) and a support ring portion (65). Also in this case, no packing is required on the mating flange (66) surface as in FIG. FIG. 3-3 shows a seal portion (6
7) is provided on the valve body (68) side, and the ring portion (69) is provided.
Is provided on the valve body (70) side. In this case, an extra ring seal portion (71) is required, and a packing (73) is also required on the mating flange (72). The purpose of providing the valve seat ring (6) is twofold. One is the purpose as a sealing material. Another important purpose is to secure a clearance space for extracting the valve shaft (4) and the valve element (3), which have become integral, from the valve body (1) together. In FIG. 2, the integral structure of the valve shaft (4) and the valve body (3) is such that the center of the valve body (3) is 90 °- An oblique line parallel to the center of the valve shaft (4) having an angle of Θ °, the valve body (3)
A hatched line in contact with the lower part is drawn, and this is defined as a B line. If the point D where the line B intersects with the outlet end face (7) is inside the outer diameter C of the valve seat ring (6), the integral structure of the valve shaft (4) and the valve body (3) is (11) Stop plate (1
After removing 0) upward, it can be pulled obliquely downward and to the right in the same direction as the valve stem (4). As described above, if the outlet end face (7) has a spigot having an inner diameter C and a thickness of 2A, that is, a mounting hole for the valve seat ring (6), the outlet can be removed without removing the valve body (1) from the piping system. If the mating flange (22) is detached from the end face (7) and the valve seat ring (6) is detached, the sealing material integrally formed with the valve seat ring (6) can be removed, and the valve shaft (4) can be removed. ) And the valve element (3), the valve shaft seal (17) can be replaced.

The structure is constructed as described above. Next, the operation will be described. FIG. 4 is a side view of the valve body (1) of FIG. 2 as viewed from the right side. However, FIG. 2 shows a valve closed state, and FIG. 4 shows a valve open state. In FIG.
The point E, which was at the top apex at the center of the valve element (3) when the valve was closed,
When the valve is opened, it moves to the point F on the circumference of the valve seat ring (6). Similarly, the point G at the bottom of the valve body (3) when the valve is closed moves to the point H when the valve is opened. As described above, with the opening and closing of the valve, the uppermost point E and the lowermost point G of the valve body (3) slide in the circumferential direction on the valve seat ring (6), and are linearly connected between the two points. The trajectory is drawn, but other parts on the circumference of the valve element (3) come off from the valve seat ring (6). Therefore, the foreign matter at the uppermost part and the lowermost part on the valve seat ring (6) is hardly caught between the valve body (3) by this sliding action. Particularly at the point G where foreign matter is likely to remain, the foreign matter is not easily caught by the valve element (3) when the valve is opened.

FIG. 5 shows an embodiment of the second aspect of the present invention. In FIG. 2, the inlet end face (18) and the outlet end face (7) of the valve body (1) are configured in parallel,
Since the valve shaft (4) is inclined at an angle of? With respect to the outlet end face (7), there is a portion that can be reduced in the lower structure of the valve body (1). Therefore, instead of reducing this portion, the valve body (24) is configured by inclining the inlet end face (25) by α degrees with respect to the outlet end face (7) as shown in FIG. According to this structure, not only can the weight of the valve itself be reduced, but also the following advantages can be obtained. That is, a valve having the shape shown in FIG. 5 is provided at the discharge end of the horizontal pipe, and the outlet end face (7) is inclined downward. When the hose is attached to the outlet end face (7) in such a state, the downward bending of the hose is reduced, and the load applied to the discharge end of the pipe is reduced.
There is an advantage that the work of installing a heavy hose becomes easier. Further, since the inlet end face (25) and the outlet end face (7) have an inclination of α degrees, it is difficult to penetrate the valve of claim 2 with straight through bolts and attach flanges to both end faces. It is. Therefore, required screw holes (27) are provided at right angles on both end surfaces, and the flanges (2) are provided.
6) A structure in which a bolt (28) for fastening is screwed.

According to an embodiment of the invention, the valve body (1) in FIG. 2 and the valve body (24) in FIG. 5 are made of a transparent or translucent material such as plastic, This is a butterfly valve whose inside can be seen through. In the valve body (1) or (24) according to claim 1 or 2, the distance from the inlet end face (18) or (25) to the outlet end face (7) is such that the angle between the valve shaft and the valve body is large. Because of this, it is larger than the conventional normal flat and thin butterfly valve. Therefore, by making use of the feature that this portion is large and making the valve body a transparent body or a translucent body, it is possible to secure a space through which the inside can be sufficiently seen. By carrying out claim 3 at the discharge end of the pipe or the like, it is possible to confirm the liquid type or the flow state of the liquid flowing inside the valve, and to prevent erroneous transfer operation of different kinds of liquids, etc. .

[0012]

The effects of the invention of claim 1 for each problem to be solved by the invention can be evaluated as follows. (B) Effect on the problem 1: In the present invention, the valve seat ring (6) is disposed on the outlet end face (7), and the valve seat ring (6) is provided.
The greatest effect is that the sealing material integrated with the valve seat ring (6) can be easily replaced by the detachment.
In addition, the valve shaft (4) and the valve body (3) are made inseparable, simplifying the structure and allowing the valve shaft (7) to be easily removed from the outlet end face (7). It became easy. Therefore, at the site of use, instead of the valve assembly, it is only necessary to provide a permanent seal material, which makes it easier to manage and lowers the cost. In addition, even in the case of an accident such as leakage from the seal, the return of work is quicker, so that the economic effect is very large. (B) Effect on Problem 2: In the conventional structure, the seal could not be replaced without disassembling the valve shaft and the valve body. However, in the present invention, the valve shaft and the valve body are in an integral and inseparable structure. , The number of replacement steps is greatly reduced. At the same time, the number of processing steps and assembly steps can be greatly reduced by simplifying the structure, and the economic effect is very large. (C) Effect on Problem 3: Since the valve shaft and the valve body can be integrally processed, the valve body (3) and the valve shaft (4) occupying the flow path (2).
The volume of the part can be made as small as possible.
Also, the valve shaft (4) cantilever the valve body (3) only by the upper mounting hole (5), and the valve shaft (4) does not exist in the lower part of the flow path (2). Flow resistance can be greatly improved over conventional valves, and their functional effects are great. (D) Effect on the problem 4: In the present invention, the valve shaft and the valve body are integrated, and a cantilever structure is formed from the upper mounting hole (5), and the valve seat ring (6) is attached to the outlet end face (7). The arrangement makes it possible to make the valve body (1) thinner in the flow direction and lighter than the conventional inclined butterfly valve. This is a feature that has a great economic effect on the piping configuration. (E) Effect on problem 5: In the present invention, since the valve shaft (4) does not have a mounting hole in the lower part of the flow path (2),
The liquid residue does not bite into the mounting hole of the valve shaft (4). In addition, since the upper and lower contact points between the valve body (3) and the valve seat ring (6) close while sliding on the seal circumference of the valve seat ring (6) when the valve is closed, the residue of the seal portion is removed. It acts as a pushing function and has the effect of preventing biting of residues.

The effects of the second and third aspects can be evaluated as follows. (F) It is general that a horizontal pipe terminal where a hose is always attached is provided with an inclined pipe fitting or the like to tilt the pipe terminal downward. In this manner, the hose mounting operation can be facilitated, and at the same time, the load on the valve at the pipe end due to the bending of the hose during liquid transfer can be reduced. Therefore, according to the second aspect of the present invention, the inclined pipe fittings and the like can be omitted, a work space can be widened, and the manufacturing cost of the apparatus can be reduced. (G) At the discharge end of the pipe, in order to confirm the liquid type or flow state of the liquid flowing inside the pipe, it is general to provide a separate fluoroscopic tube in the pipe. Claim 3 can be effectively used as an alternative to the fluoroscopic tube, and has a remarkable economic effect such as a reduction in the size of the device and a wider working space, and a reduction in the manufacturing cost of the device. As described above, the effects of the present invention not only eliminate the disadvantages of the function of the conventional tilt type butterfly valve, but also reduce the maintenance service economy, the mounting assembly economy, and the manufacturing economy. The effect that contributes to sex is very large. Therefore, the present invention greatly contributes to the development of industries related to corrosive liquids such as industrial waste liquids, which are increasingly important for environmental protection.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conventional inclined butterfly valve in a flow path direction when the valve is closed.

FIG. 2 is a cross-sectional view in the flow path direction when the tilt type butterfly valve according to claim 1 is closed.

FIGS. 3-1, 3-2 and 3-3 are partial views of an embodiment of the valve seat ring according to claim 1. FIG.

FIG. 4 is a right side view of FIG. 2 showing a state when a valve is opened.

FIG. 5 is a cross-sectional view in the flow path direction when the tilt type butterfly valve according to claim 2 is closed.

[Explanation of symbols]

1 ………… Valve body 24 …………
… Valve body 2 ………… Channel 25 …………
… Inlet end face 3 ………………………………………………………… Valve shaft 5 …………… Mounting hole 6 ………… Valve seat ring 7 ………… End face

Claims (3)

[Claims] A valve shaft (4) having a circular plate-shaped valve element (3) which is orthogonal to a cylindrical flow path (2) provided in a valve body (1) when closed. In the tilt type butterfly valve configured to be rotatably mounted at a fixed angle with respect to 2), the mounting hole (5) of the valve shaft (4) is provided at one position in the circumferential direction of the flow path (2). And the valve shaft (4) and the valve body (3) are integrally formed inseparably, and means for restraining the axial movement of the valve shaft (4) with respect to the valve body (1) is provided. The valve seat ring (6) that closes the flow path (2) in close contact with the circumferential side of (3) is perpendicular to the flow path (2) and does not interfere with the mounting hole (5) of the valve shaft (4). And a valve seat ring (6) that is detachable from an end surface (7) of the valve body (1). 2. An inclined butterfly valve according to claim 1, wherein the inlet end face (25) of the valve body (24) is inclined at a constant angle with respect to the outlet end face (7). . 3. The tilting butterfly valve according to claim 1, wherein the valve body (1) or (24) is formed of a transparent body or a translucent body.