Water stop valve

Abstract

To provide a water stop valve capable of reliably connecting a stop valve body and an operation part to each other.SOLUTION: The water stop valve includes: a housing having a flow path from a primary side to a secondary side; a stop valve body provided in the flow path of the housing for opening / closing the flow path; an operation part for allowing opening / closing operation of the stop valve body; and an operation shaft part having a first shaft part arranged on the stop valve body side and a second shaft part arranged on the operation part side in an axial direction with respect to the first shaft part for connecting the stop valve body and the operation part. An end on the operation part side in the axial direction of the first shaft part and an end on the stop valve body side in the axial direction of the second shaft part are fitted to each other, thereby, in a fitted portion between the first shaft part and the second shaft part where the first shaft part and the second shaft part are connected to each other, a communication part is provided for allowing an inside of the fitting and an outside of the fitting of the fitted portion, to communicate with each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a stop valve that is placed midway through a pipe. [Background technology]

[0002] A stop valve is disclosed in Patent Document 1. The stop valve of Patent Document 1 includes a stop valve body 5 and an actuator 6.

[0003] A flow path dividing member 24 is provided in the internal space 23a of the stop valve body 5, and an internal flow path 25 is divided by the flow path dividing member 24. The stop valve also includes an opening / closing mechanism 60 that opens and closes the internal flow path 25, and a spindle 10 that is connected to the opening / closing mechanism 60 and the actuator 6.

[0004] The spindle 10 has an upper spindle 46 and a spindle body 45. The upper spindle 46 has a large diameter shaft portion 41 having an exposed portion 9 to which the actuator 6 is connected. The spindle body 45 has a small diameter shaft portion 42 and a plate portion 43. In this spindle 10, the upper spindle 46 and the spindle body 45 are connected such that the small diameter shaft portion 42 is fitted into the large diameter shaft portion 41.

[0005] Furthermore, in the stop valve, the actuator 6 is driven to rotate the spindle 10, and the opening and closing mechanism 60 opens and closes the internal flow path 25. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2023-83845 Summary of the Invention [Problem to be solved by the invention]

[0007] In the stop valve described above, the small diameter shaft portion 42 fits into the large diameter shaft portion 41, but the internal pressure of this fitting portion can cause the fitting to occur while the air is compressed. If this happens, the pressure of the compressed air can loosen or disengage the fitting, making it impossible to properly connect the actuator 6 and the opening / closing mechanism 60.

[0008] This is not limited to the case where the actuator 6 automatically opens and closes the door, but is also applicable to the case where the door is manually operated.

[0009] The present invention aims to provide a stop valve that can reliably connect the stop valve body and the operating part. [Means for solving the problem]

[0010] The present invention relates to a stop valve comprising: a housing having a flow path from a primary side to a secondary side; a plug body provided in the flow path within the housing for opening and closing the flow path; an operating unit for operating the plug body to open and close it; and an operating shaft having a first shaft arranged on the plug body side to connect the plug body and the operating unit, and a second shaft arranged on the operating unit side in the axial direction relative to the first shaft, wherein the axial end of the first shaft on the operating unit side and the axial end of the second shaft on the plug body side are fitted together, and a communication portion is provided at the fitting portion of the first shaft and second shaft where the first shaft and second shaft are connected, which communicates between the inside and outside of the fitting portion.

[0011] In the stop valve configured as described above, the mating portion has a communication portion, so when the ends of the first and second shanks are mated to connect them, the pressure inside the mating portion is released to the outside of the mating portion via the communication portion, thereby ensuring a reliable connection between the first and second shanks and a reliable connection between the plug body and the operating portion.

[0012] The fitting portion of the present invention includes an end portion of the first axial portion on the operating portion side in the axial direction, an end portion of the second axial portion on the plug body side in the axial direction, and a fitting retaining portion interposed between the two end portions to maintain the fitted state, and the communicating portion may be configured to communicate between the space inside the fitting retaining portion in the fitting portion and the space outside the fitting retaining portion.

[0013] The stop valve having the above configuration has a communication section that connects the space inside the fitting retaining section in the fitting portion with the space outside the fitting retaining section, so that the fitting portion can be reliably depressurized.

[0014] The communication portion of the present invention may be provided on the first shaft portion.

[0015] In the stop valve having the above configuration, the communication portion is provided on the first shaft portion, so that the fitted portion can be reliably depressurized.

[0016] The communication portion of the present invention may be provided on the second shaft portion.

[0017] In the stop valve having the above configuration, the communication portion is provided on the second shaft portion, so that the fitted portion can be reliably depressurized.

[0018] The communication portion of the present invention may be provided in the fitting and holding portion.

[0019] In the stop valve having the above configuration, the communication portion is provided in the fitting holding portion, so that the fitting portion can be reliably depressurized. [Effects of the Invention]

[0020] According to the stop valve of the present invention, the connecting portion has a communication portion, so that the plug body and the operating portion can be securely connected. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a partially cutaway cross-sectional view of a stop valve according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a half-sectional perspective view showing an axially fitted state of the first shaft portion and the second shaft portion, and a fitted portion. [Figure 3] FIG. [Figure 4] FIG. 10 is a half-sectional perspective view of a second shaft portion according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a perspective view of a third embodiment of the present invention, showing a half cross section of the second shaft portion in a fitted state between the first shaft portion and the second shaft portion. DETAILED DESCRIPTION OF THE INVENTION

[0022] Stop valves according to embodiments of the present invention will be described with reference to the drawings. First, a first embodiment will be described with reference to Figures 1 to 5. Prior to that, the stop valve 1 will be described. As shown in Figure 1, the stop valve 1 is provided in a flow path 2 from a primary side A to a secondary side B, and includes a housing 3, a valve body 4, an operating part 5, and an operating shaft 6.

[0023] 〔housing〕 As shown in Fig. 1, the housing 3 has therein the flow path 2 from the primary side A to the secondary side B. A check valve 7 is provided near the secondary side B of the flow path 2. A water meter (not shown) is also arranged on the secondary side B of the housing 3 so that it can be screwed or crimped.

[0024] [Plug body] The plug body 4 is provided in the flow path 2 in the housing 3 to open and close the flow path 2. The plug body 4 is disposed on the primary side A of the flow path 2, and in this case, the plug body 4 is a ball valve body.

[0025] [Operation unit] The operating unit 5 is configured to open and close the plug body 4. The operating unit 5 is disposed above an extension tube 8 that is connected to the flow path 2 and extends above the plug body 4. A thread 9 is formed on the outer peripheral surface of the upper part of the extension tube 8, extending in the circumferential direction.

[0026] Specifically, the operating section 5 includes an operating section tube 10 , a handle 11 , a handle fitting 12 , and a cover 13 .

[0027] The operation section tube 10 is located above the extension tube 8, and the extension tube 8 and the operation section tube 10 are in communication with each other. A thread 14 is formed along the lower circumferential surface of the operation section tube 10 and is provided to screw into thread 9 of the extension tube 8. The inner diameters of the internal insertion portion 15 of the extension tube 8 and the internal insertion portion 16 of the operation section tube 10 are such that the extension tube 8 has a larger diameter and the operation section tube 10 has a smaller diameter. In addition, a thread 10a is formed along the upper circumferential surface of the operation section tube 10.

[0028] The handle 11, which is operated by an operator to open or close the plug body 4, is located above and outside the operating tube 10 and is rotatable around a vertical axis (the central axis of the operating tube 10). The upper part of the handle fitting 12 is inserted into the handle 11 and integrally connected via a pin member 17, and the lower part of the handle fitting 12 forms a protrusion 12a so that it can rotatably fit on the upper inner circumference of the operating tube 10. The cover 13 is fitted onto the handle fitting 12 via an introduction hole (reference numeral omitted) midway in the vertical direction and is formed to cover the upper end of the operating tube 10. An O-ring 18 that seals the outer peripheral surface of the handle fitting 12 is fitted into the introduction hole. In addition, a continuous concave-convex portion 19 is formed vertically on the outer peripheral surface of the cover 13 to allow for operation of the cover 13 with a tool. In addition, a thread 13a is formed on the inner peripheral surface of the cover 13 to thread onto the thread 10a of the operating tube 10. In this embodiment, the handle 11, the handle fitting 12, and the cover 13 of the operation unit 5 are assembled together.

[0029] [Operation shaft] The operating shaft portion 6 is configured to connect the plug body 4 and the operating unit 5. That is, the operating shaft portion 6 is disposed within the extension tube 8 or the operating unit tube 10, and has a first shaft portion 20 disposed on the plug body 4 side, and a second shaft portion 21 disposed on the operating unit 5 side in the axial direction (vertical axis) relative to the first shaft portion 20.

[0030] [First shaft part] As shown in FIG. 1 or 2, the first shaft portion 20 has a first main body portion 22, a first head portion 23, and a first neck portion 24. The first main body portion 22 is fitted into the extension tube 8 so as to be rotatable in the vertical axis direction. An operating valve element 27, which is smaller than the first main body portion 22 and fits into the upper recess 4a of the plug body 4, is disposed at the lower end of the first main body portion 22. Multiple upper and lower O-rings 25 (the O-rings 25 are omitted in FIG. 2) are fitted into the vertical middle portion of the first main body portion 22, and these O-rings 25 are disposed so as to abut against the inner circumferential surface of the extension tube 8. A stopper pin 26 is disposed at the upper end portion of the first main body portion 22 so as to protrude outward from the first main body portion 22. The stopper pin 26 is rotatable about the vertical axis together with the first shaft portion 20 (operating valve element 27) on the circumferential end surface of a notch (not shown) formed by circumferentially notching the upper portion of the extension tube 8.

[0031] The first head 23 and first neck 24 of the first shaft portion 20 are configured in a stepped shape with a smaller diameter than the first main body portion 22, are integrally formed on the upper part of the first main body portion 22, and are loosely fitted (arranged with a gap) into the operation portion tube 10. In this case, being formed in a stepped shape means that the first head 23 has a large diameter and the first neck 24 has a small diameter. The first neck 24 and first head 23 are integrally formed in this order with the first main body portion 22 from below.

[0032] For convenience of explanation, the configuration of the first head portion 23, i.e., the first head portion 23 above the first neck portion 24, will be described first. An engaged portion is formed on the outer periphery of the first head portion 23. This engaged portion is defined as first serrations 28. The first serrations 28 are configured to engage with an engaging portion at the bottom of the second shaft portion 21, which will be described later, in the circumferential direction (rotational direction). As the engaged portion is the first serrations 28, as shown in FIG. 3, it has a plurality of first protrusions 28a in the longitudinal direction and a plurality of first recesses 28b in the outer periphery.

[0033] The first neck portion 24 is integrally formed on the upper side of the first body portion 22 below the first head portion 23. As shown in FIGS. 2 and 3 , the first neck portion 24 has a cylindrical surface 24a with a smaller diameter than the first head portion 23. The upper and lower surfaces of the cylindrical surface 24a are annular surfaces 24b that protrude radially from the cylindrical surface 24a. Of the two annular surfaces 24b, the lower annular surface 24b has a larger diameter. In the first neck portion 24, the lower outer peripheral surface of the lower annular surface 24b is fitted into the inner peripheral surface of the lower portion 30A of the second body portion 30 of the second shaft portion 21. As shown in FIG. 2 , an O-ring 29 is fitted into the first neck portion 24, and the outer diameter of the O-ring 29 abuts against the inner peripheral surface of the lower portion 30A of the second body portion 30 of the second shaft portion 21. This O-ring 29 functions as a fitting retainer. The first boss portion 23a of the first head portion 23 from which the first serrations 28 have been removed has the same configuration as the first neck portion 24, and the first boss portion 23a and the first neck portion 24 are formed in a cylindrical shape.

[0034] [Second shaft part] 1 or 2, the second shaft portion 21 is disposed so as to connect the first shaft portion 20 and the operation unit 5 in the vertical axis direction. The second shaft portion 21 is rotatably fitted into the operation unit tube 10. Specifically, the second shaft portion 21 has a second main body portion 30, a second head portion 31, and a second neck portion 32.

[0035] 3, second main body portion 30 is formed into a cylindrical shape with the same outer diameter and has lower portion 30A, intermediate portion 30B, and upper portion 30C. Lower portion 30A, intermediate portion 30B, and upper portion 30C have an internal space portion 30D located inside, and second shank 21 is configured to fit into first shank 20 from the outside above (first shank 20 fits inside second shank 21). Specifically, lower portion 30A of second main body portion 30 is arranged from above on the outer periphery of first shank 20, including first neck portion 24 and first head portion 23, and lower end surface 3a of lower portion 30A of second main body portion 30 abuts upper end surface 22a of first main body portion 22 of first shank 20 from above.

[0036] The internal space portion 30D of the intermediate portion 30B of the second main body portion 30 has an inner diameter smaller than that of the lower portion 30A, and the intermediate portion 30B of the second main body portion 30 is formed with engagement portions that circumferentially engage with the first serrations 28. The engagement portions are engagement serrations 33 that circumferentially engage with the first serrations 28. The engagement serrations 33 have a plurality of second protrusions 33a and second recesses 33b in the longitudinal direction in the circumferential direction (see FIG. 1 or FIG. 4). The upper surface of the internal space portion 30D of the second main body portion 30, on which the engagement serrations 33 are formed, is a conical inclined surface 32a that slopes toward the second neck portion 32.

[0037] When the lower end surface 3a of the lower portion 30A of the second main body portion 30 abuts against the upper end surface 22a of the first main body portion 22 from above and the first serrations 28 and the engaging serrations 33 are fitted together in the circumferential direction, that is, when the end of the first shaft portion 20 on the operating portion 5 side in the vertical axis direction and the end of the second shaft portion 21 on the plug body 4 side in the vertical axis direction are fitted together in the up-down direction, as shown in Figure 2, the fitting portion K between the first shaft portion 20 and the second shaft portion 21 is specified as a space S1 around the O-ring 29 (fitting and holding portion), a space S2 between the first serrations 28 and the engaging serrations 33, and a space S3 between the first boss portion 23a of the first head portion 23 and the inclined surface 32a of the second main body portion 30. Specifically, space S1 is defined as a space S1 surrounded by the cylindrical surface 24a, the upper and lower annular surfaces 24b, and the lower surfaces of the first serration 28 and the engaging serration 33, which engage with each other, and space S1, space S2, and space S3 are connected to each other.

[0038] The second head 31 and second neck 32 of the second shaft 21 have a smaller diameter than the second body 30, are integrally formed with the upper part of the second body 30, and are rotatably fitted to the operating tube 10. The second neck 32 and second head 31 are integrally formed in this order with the second body 30 from below. An engaged portion is formed on the outer periphery of the second head 31, which engages circumferentially with an engaging portion on the lower inner circumferential surface of the handle fitting 12. Serrations are used for both the engaging portion and the engaged portion, and the engaged portion is specifically named second serrations 34. A cylindrical second boss 34a is formed at the center of the second serration 34.

[0039] A cylindrical surface 35 having a cylindrical shape is formed on the outer circumferential surface of the second neck portion 32. This cylindrical surface 35 is formed so as to protrude into an annular key groove guide portion 36 formed midway in the vertical direction of the operation portion tube 10. Note that an O-ring 37 is fitted between the cylindrical surface 35 of the second neck portion 32 and the upper end surface 3b of the second main body portion 30, as shown in FIG.

[0040] That is, as configured above, the end of the first shaft portion 20 on the operating portion 5 side in the vertical axis direction is the first neck portion 24, the first head portion 23 and the O-ring 29, and the end of the second shaft portion 21 on the plug body 4 side in the vertical axis direction is the second body portion 30, and the end of the second shaft portion 21 is fitted externally onto the end of the first shaft portion 20, thereby fitting the first shaft portion 20 and the second shaft portion 21 together.

[0041] In the above-mentioned stop valve 1, with the stop valve body 4 attached to the flow path 2, the first main body portion 22 of the first shaft portion 20 is attached to the extension pipe 8 by fitting the operating valve body 27, which fits into the upper recess 4a of the stop valve body 4, into the extension pipe 8 from above.

[0042] Next, the second shaft 21 is attached to the first shaft 20 so that the engaging serrations 33 of the second shaft 21 engage with the first serrations 28 of the first shaft 20 from above. Next, the threads 14 of the operating section tube 10 are threadedly engaged with the threads 9 of the extension tube 8 so that the operating section tube 10 is positioned above the extension tube 8, and the operating section tube 10 is attached to the extension tube 8. Next, key member 12b formed on the lower part of the handle fitting 12 of the operating section 5 assembly is inserted from above into a key groove (not shown) formed on the upper part of the operating section tube 10 and into the second serrations 34 of the second head 31 of the second shaft 21. Further, the concave-convex portion 19 of the assembly is rotated to threadably engage the threads 10a of the operating section tube 10 with the threads 13a of the cover 13, and the cover 13 is then lowered to complete the stop valve 1. By rotating the handle 11, the key member 12b is guided by the key groove guide portion 36 around the vertical axis.

[0043] Then, by rotating the handle 11, the first shaft portion 20 rotates around the vertical axis and the second shaft portion 21 rotates, and as a result, the plug body 4 rotates around the vertical axis, opening and closing the plug body 4, and the flow path 2 between the primary side A and the secondary side B can be opened and closed.

[0044] With regard to the first shank 20 and the second shank 21, first serrations 28, which are the end of the first shank 20 on the operating unit 5 side in the longitudinal direction, and engaging serrations 33, which are the end of the second shank 21 on the plug body 4 side in the longitudinal direction, are fitted together in the vertical direction (in this case, engaged in the circumferential direction), thereby connecting the first shank 20 and the second shank 21 in the longitudinal direction. In other words, the first head 23 of the first shank 20, the first neck 24, and the O-ring 29 are fitted into the internal space 30D of the second main body 30.

[0045] As described above, the mating portions K between the first shaft portion 20 and the second shaft portion 21 include the space S1 around the O-ring 29, the space S2 between the first serration 28 and the engaging serration 33, and the space S3 between the first boss portion 23a of the first head portion 23 and the inclined surface 32a of the upper portion 30C of the second main body portion 30.

[0046] In the first embodiment, the stopcock 1 is configured to have a communication part that communicates between the inside and outside of the fitting part K. Specifically, the communication part is configured to be related to the first shaft part 20, and is configured to have a communication part that communicates from top to bottom with the first neck part 24 into which the O-ring 29 is fitted.

[0047] Several embodiments of the first embodiment are shown. As shown in Fig. 3, in this example, the first serrations 28 of the first shaft portion 20 have a plurality of first protrusions 28a in the longitudinal direction and a plurality of first recesses 28b in the outer peripheral direction, and a groove 40 is formed in the cylindrical surface 24a of the first neck portion 24 in the vertical direction along the longitudinal axis. In other words, the first recesses 28b and the groove 40 serve as a communicating portion. This groove 40 is formed so as to extend from the first recess 28b to the lower annular surface 24b. Although Fig. 3 shows a single groove 40, there may be multiple grooves 40, and each of these grooves 40 may be configured to communicate with the first recesses 28b.

[0048] In the above configuration, an O-ring 29 is attached to the first neck portion 24, but since there is a groove 40 on the inside of the O-ring 29, air in the fitting portion K flows into the groove 40, and the pressure inside the fitting at the fitting portion K is released to the outside of the fitting via the groove 40. Therefore, the first shaft portion 20 and the second shaft portion 21 can be reliably connected, and the plug body 4 and the operating portion 5 are reliably connected.

[0049] Another example of the first embodiment will be described without illustration. In this case, the communication portion is configured such that a spiral groove spiraling from top to bottom is formed circumferentially on the cylindrical surface 24a of the first neck portion 24, and the spiral groove communicates with a specific first recess 28b. With this configuration, the groove connected to the first recess 28b is a spiral groove, so that pressure inside the fitting portion K is released to the outside of the fitting through the groove 40.

[0050] Another example of the first embodiment is shown. The diameter of the first boss 23a of the first head 23 is the same as that of the first neck 24, and the first boss 23a and the first neck 24 are cylindrical. However, in this case, the first neck 24 does not have a cylindrical surface 24a, but has a D-shaped communication section formed by cutting out the cylindrical surface 24a in a plan view, and one or more first recesses 28b communicate with the D-shaped cutout. In this example, the mating portion K communicates with the cutout, allowing pressure inside the mating portion K to escape to the outside. This ensures a reliable connection between the first shank 20 and the second shank 21, thereby ensuring a reliable connection between the plug body 4 and the operating portion 5.

[0051] In yet another example of the first embodiment, although unrelated to the first serrations 28, a downward hole is formed in the center of the first boss portion 23a of the first head portion 23, and the lower part of the hole is extended and open to the outer periphery of the first main body portion 22. In this case, the open portion is located above the upper O-ring 25 of the first main body portion 22. This hole allows pressure inside the mating portion K to escape to the outside of the mating portion, ensuring a secure connection between the first shank 20 and the second shank 21, and thus a secure connection between the plug body 4 and the operating portion 5.

[0052] Next, a second embodiment will be described. In the second embodiment, a communication portion is configured as a configuration related to the second shaft portion 21. Several examples of the second embodiment will be described.

[0053] 4 , in one example of the second embodiment, the communication portion is configured such that pressure inside the fitting of the fitting portion K in the second shank 21 can be released to the outside of the fitting through a hole 41. That is, the hole 41 is formed from the second boss portion 34a, which is the center of the second head portion 31 of the second shank 21, toward the center of the second neck portion 32. The lower end of the hole 41 opens into the internal space portion 30D of the second main body portion 30.

[0054] With this configuration, when the first serrations 28, which are the axial end of the first shank 20 on the operating part 5 side, and the engaging serrations 33, which are the axial end of the second shank 21 on the plug body 4 side, are fitted together in the vertical direction, air escapes from the fitting portion K through the holes 41, and the pressure inside the fitting at the fitting portion K escapes to the outside of the fitting. Therefore, the first shank 20 and the second shank 21 can be securely connected, and the plug body 4 and the operating part 5 are securely connected.

[0055] An alternative example of the second embodiment will be described without illustration. In this alternative example, the communication portion is formed by one or more holes on the inner circumferential surface of the internal space portion 30D of the second main body portion 30, between the second recesses 33b of the engaging serrations 33 and the lower portion 30A of the second main body portion 30. With this configuration, when the first serrations 28 and the engaging serrations 33, which are the ends of the second shank 21 on the plug body 4 side in the axial direction, are fitted together in the vertical direction, the holes allow pressure inside the fitting to escape from the fitting interior to the fitting exterior, ensuring a reliable connection between the first shank 20 and the second shank 21, and therefore between the plug body 4 and the operating portion 5.

[0056] Another example of the second embodiment is shown. The communication portion in this example is a groove on the inner circumferential surface of the internal space portion 30D of the second main body portion 30, which connects the second recessed portions 33b of the engaging serrations 33 to the inner circumferential surface of the lower portion 30A of the second main body portion 30. In this example, a vertical groove or a spiral groove is provided on the inner circumferential surface of the internal space portion 30D of the lower portion 30A of the second recessed portions 33b. The vertical groove is linear and opens from the second recessed portions 33b of the engaging serrations 33 to the lower end of the inner circumferential surface of the second main body portion 30. The spiral groove is on the inner circumferential surface of the lower portion 30A of the second main body portion 30, and opens from the second recessed portions 33b of the engaging serrations 33 to the lower end of the inner circumferential surface of the second main body portion 30.

[0057] In this configuration, the pressure inside the fitting is released from the inside to the outside of the fitting via the groove or the spiral groove, so that the first shaft portion 20 and the second shaft portion 21 can be securely connected, and the plug body 4 and the operating portion 5 are securely connected.

[0058] In yet another example of the second embodiment, the inner circumferential surface of the lower portion 30A of the second main body portion 30 is polygonal. When the end of the first shank 20 on the operating portion 5 side in the longitudinal direction and the end of the second shank 21 on the plug body 4 side in the longitudinal direction are fitted together, the polygonal shape of the inner circumferential surface of the lower portion 30A of the second main body portion 30 creates a gap. Therefore, pressure inside the fitting is released from the inside to the outside of the fitting through the polygonal cross section. This ensures a reliable connection between the first shank 20 and the second shank 21, and a reliable connection between the plug body 4 and the operating portion 5.

[0059] Next, a third embodiment will be described. In the third embodiment, as shown in Fig. 5, a through-hole is formed in an O-ring 29 (fitting and holding portion) in the first neck portion 24 to form a communication portion.

[0060] 4, a groove 42, which is a through-hole as a through portion along the longitudinal axis direction, is formed on a part of the outer side of O-ring 29. In this case, groove 42 is formed so as to open outward in the circular cross section of O-ring 29.

[0061] In this configuration, when the end of the first shank 20 on the operating portion 5 side in the longitudinal direction and the end of the second shank 21 on the plug body 4 side in the longitudinal direction are fitted together, the groove 42 formed in the O-ring 29 allows the pressure inside the fitting to escape from the inside to the outside of the fitting, thereby ensuring a reliable connection between the first shank 20 and the second shank 21, and therefore a reliable connection between the plug body 4 and the operating portion 5. The groove 42 may be formed on the inside of the O-ring 29. Furthermore, the O-ring 29 may have a circumferentially notched portion as the penetration portion, so that the notched portion can serve as a communication portion. The O-ring 29 may have a polygonal cross section instead of a circular one, and an outer groove 42 and an inner groove 42 may be formed therein.

[0062] Another example of the third embodiment will be described without illustration. A fitting-and-retaining portion that prevents (holds) second shaft portion 21 from coming off first shaft portion 20 is configured to be fitted in place of O-ring 29. The fitting-and-retaining portion can be a ring-shaped spring (a coil spring is used), with gaps in the spring serving as through-portions (communicating portions). Alternatively, the fitting-and-retaining portion can be a ring-shaped sponge or ring-shaped nonwoven fabric, with porous holes formed in the sponge or nonwoven fabric serving as through-portions.

[0063] With this configuration, when the end of the first shaft portion 20 on the operating portion 5 side in the vertical axis direction and the end of the second shaft portion 21 on the plug body 4 side in the vertical axis direction are fitted together, a through portion is formed in the fitting holding portion, allowing the pressure inside the fitting to escape from inside the fitting to outside the fitting, thereby ensuring a secure connection between the first shaft portion 20 and the second shaft portion 21, and a secure connection between the plug body 4 and the operating portion 5.

[0064] In the above embodiment, the stop valve 1 is described as being equipped with a check valve 7, but the present invention can also be applied to stop valves for cold water supply and hot water supply that do not have a check valve 7. Also, in the above embodiment, the handle 11 is provided as the operating part, but the present invention can also be applied to a stop valve that can automatically operate the stop valve body 4, or to a stop valve with two or more shafts and an operating shaft. Also, in the above embodiment, the stop valve body 4 is a ball valve, but the present invention can also be applied to a screw valve or a butterfly valve. [Explanation of symbols]

[0065] 1...stop valve, 2...flow path, 3...housing, 4...plug body, 4a...upper recess, 5...operating portion, 6...operating shaft portion, 7...check valve, 8...extension tube, 10...operating portion tube, 11...handle, 12...handle fitting, 13...cover, 15...internal insertion portion, 16...internal insertion portion, 17...pin member, 18...O-ring, 19...concave and concave portion, 20...first shaft portion, 21...second shaft portion, 22...first main body portion, 23...first head portion, 23a...first boss portion, 24...first neck portion, 24a...cylindrical surface , 24b...annular surface, 25...O-ring, 26...stopper pin, 27...operating valve body, 28...first serration, 28a...first convex portion, 28b...first concave portion, 29...O-ring, 30...second main body portion, 31...second head portion, 32...second neck portion, 33...engaging serration, 33a...second convex portion, 33b...second concave portion, 34...second serration, 34a...second boss portion, 37...O-ring, 40...groove, 41...hole, 42...groove, A...primary side, B...secondary side, K...fitting portion

Claims

1. a housing having a flow path from a primary side to a secondary side; a plug body provided in the flow path within the housing to open and close the flow path; an operating unit for operating the plug body to open and close; an operating shaft portion having a first shaft portion arranged on the plug body side and a second shaft portion arranged on the operating portion side in the axial direction relative to the first shaft portion so as to connect the plug body and the operating portion; A stop valve characterized in that the axial end of the first shaft portion on the operating portion side and the axial end of the second shaft portion on the plug body side are fitted together, and a communication portion is provided at the fitting portion of the first shaft portion and the second shaft portion where the first shaft portion and the second shaft portion are connected, which communicates between the inside and outside of the fitting portion.

2. the fitting portion includes an end portion of the first shaft portion on the operating portion side in the axial direction, an end portion of the second shaft portion on the plug main body side in the axial direction, and a fitting holding portion interposed between the end portions to maintain the fitted state, The stop valve according to claim 1 , wherein the communication portion is configured to communicate a space inside the fitting-holding portion in the fitting part with a space outside the fitting-holding portion.

3. The stop valve according to claim 1 or 2, wherein the communication portion is provided on the first shaft portion.

4. The stop valve according to claim 1 or 2, wherein the communication portion is provided on the second shaft portion.

5. The stop valve according to claim 2 , wherein the communication portion is provided in the fitting retaining portion.

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