JP2017172591A - Gate valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sluice valve capable of confirming a sealed state with a simple configuration. SOLUTION: A sluice valve Xa has a valve rod 4 having a first through hole portion 43 that penetrates along the longitudinal direction and can communicate with the outside, and a second penetration through which the valve rod 4 is inserted along the longitudinal direction. A valve body 3 having a hole 32 and contacting the inner surface of the fluid pipe 2 to block the flow path, and a moving mechanism K that moves the valve body 3 in the direction of blocking the flow path by the rotation of the valve stem 4. The first through-hole portion 43 and the second through-hole portion 32 are open toward the contact surface Sb1 of the valve body 3 that comes into contact with the bottom portion 27 of the fluid pipe 2. [Selection diagram] Fig. 1

Description

  The present invention relates to a gate valve including a valve body that blocks a flow path of a fluid pipe.

  Conventionally, a gate valve including a valve stem, a valve body into which the valve stem is inserted, and a moving mechanism that moves the valve body straight by rotation of the valve stem is known (see, for example, Patent Documents 1 and 2). .

  In the gate valve of Patent Document 1, a sealing member is fixed along the outer periphery of the valve body in the flow passage direction of the fluid pipe, and a movable piece movable radially outward is disposed between the valve body and the sealing member. Has been. As the valve body moves toward the fluid pipe, the movable piece moves radially outward due to the contact between the inclined surface of the valve body and the inclined surface of the movable piece, and the seal member pressed by the movable piece The valve closes in close contact with the inner peripheral surface of the fluid pipe.

  The gate valve of Patent Document 2 is provided with a seal member independently on the upstream side and the downstream side of a valve element inserted in a fluid pipe (a valve box in the literature). In addition, an inclined surface is provided on the upper portion of each seal member, and another seal member having an inclined surface is also provided on the upper portion of the fluid pipe, and the surface pressure is ensured by press-contacting both inclined surfaces.

JP 2003-343748 A JP 2000-240820 A

  In the conventional gate valve, the sealing member is brought into close contact with the fluid pipe to enhance the sealing function, but there is a faulty assembly between the fluid pipe and the valve body, or the gate valve is aging. In some cases, fluid may leak from between the fluid pipe and the seal member. On the other hand, in order to confirm the leakage of fluid, since the gate valve has a sealed structure, it is necessary to separately provide a branch port for confirming the leakage on the downstream side of the gate valve, and the work efficiency is poor. In particular, when inspecting gate valves that have been left for many years, enormous costs are required if branch ports are provided for all gate valves.

  Therefore, a gate valve that can confirm the sealed state with a simple configuration is desired.

  The gate valve has a characteristic configuration that includes a valve rod having a first through-hole portion that penetrates along the longitudinal direction and communicates with the outside, and a second through-hole portion into which the valve rod is inserted along the longitudinal direction. A valve body that contacts the inner surface of the fluid pipe and blocks the flow path; and a moving mechanism that moves the valve body in a direction that blocks the flow path by rotation of the valve rod, The one through-hole portion and the second through-hole portion are open to a contact surface of the valve body that contacts the bottom portion of the fluid pipe.

  For example, foreign matters such as chips, rust humps, and sand accompanying the drilling may remain at the bottom of the fluid pipe. There is a possibility that the foreign matter may be caught between the bottom of the fluid pipe and the contact surface of the valve body, and the sealing function may be impaired. Since the gate valve has a sealed structure, if the sealing state cannot be confirmed, it is necessary to separately provide a branch port for confirming leakage on the downstream side of the gate valve, resulting in poor work efficiency.

  Therefore, in this configuration, the first through hole portion of the valve rod that can communicate with the outside and the second through hole portion of the valve body open toward the contact surface of the valve body that contacts the bottom of the fluid pipe. Yes. As a result, when the adhesion between the bottom of the fluid pipe and the contact surface of the valve body is impaired, the fluid is caused to flow into the first through hole through the opening of the second through hole, It is possible to flow out from the outside. For this reason, the sealing state of the gate valve can be confirmed.

  In addition, after closing the valve body with a moving mechanism, it is only necessary to confirm the leakage of fluid from the first through hole portion of the valve stem, so the work efficiency is extremely high compared to the case where a separate branch port is provided, Work costs can be saved. Thus, the gate valve which can confirm water stop with a simple structure was able to be provided.

  Another characteristic configuration is that, in the valve body, both side portions positioned on the upstream side and the downstream side of the flow path are in close contact with the inner surface of the fluid pipe and the sealing surface is formed with the contact surface at the tip. In the valve body, a recess is formed between the contact surfaces of the respective sealing portions.

  If a recess is formed on the bottom side of the fluid pipe between the respective contact surfaces as in this configuration, the fluid leaking from the sealing portion is circulated to the first through hole through the recess and discharged. The For this reason, when the sealing function of the sealing part is impaired, the leaked fluid can quickly flow into the concave part with low flow resistance and can be smoothly guided to the first through hole part. As a result, the sealing state of the sealing portion can be detected with high accuracy. In addition, since the foreign matter pushed away by the contact surface can be accommodated in the concave portion, the probability of foreign matter biting is reduced as compared with the case where the entire bottom of the valve body is in contact with the bottom of the fluid pipe, and the sealing portion The sealing function is hardly disturbed.

  Another characteristic configuration is that the valve body is formed with a groove portion communicating with the recess portion along the circumferential direction between the respective sealing portions.

  If a groove that communicates with the recess along the circumferential direction of the valve body is provided as in this configuration, for example, even if fluid leaks from the upper part of the fluid pipe, the fluid flows into the recess via the groove. , And flows out from the first through-hole portion. That is, the sealing state over the circumferential direction of the fluid pipe can be confirmed.

It is a longitudinal cross-sectional view which shows schematic structure of the gate valve which concerns on 1st embodiment. It is a cross-sectional view which shows schematic structure of the gate valve which concerns on 1st embodiment. It is sectional drawing along the axial center of the fluid pipe | tube which shows the state closed. It is sectional drawing along the axial center of the fluid pipe | tube which shows the state opened. It is a perspective view of the valve stem and valve body concerning a first embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the gate valve which concerns on 2nd embodiment. It is a cross-sectional view which shows schematic structure of the gate valve which concerns on 2nd embodiment. It is a longitudinal cross-sectional view of the gate valve which shows the valve-opened state which concerns on 2nd embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the gate valve which concerns on 3rd embodiment. It is a cross-sectional view which shows schematic structure of the gate valve which concerns on 3rd embodiment. It is a longitudinal cross-sectional view of the gate valve which shows the valve open state which concerns on 3rd embodiment.

  Hereinafter, an embodiment of a gate valve according to the present invention will be described with reference to the drawings. As a gate valve of this embodiment, the gate valve Xa installed in the cutting pipe parts 1a and 1b, the gate valve Xb installed in the pipe perforation port 1c, and the gate valve Xc installed in the water pipe will be described as an example. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the invention. In addition, in drawing, the cross-sectional view along the flow path direction of a water pipe is made into a longitudinal cross-sectional view, and the cross-sectional view perpendicular | vertical to the flow path direction of a water pipe is made into a cross-sectional view. Here, the sectional view in the present embodiment is expressed as a drawing when a member indicated by oblique lines is a sectional view and other members are viewed in cross section. Hereinafter, the direction of gravity will be described below, and the direction opposite to the direction of gravity will be described with reference to the buried water pipe.

[First embodiment]
1 to 5 show a gate valve Xa according to the first embodiment. In the present embodiment, after the water pipe 1 (an example of a fluid pipe) is cut, the gate valve Xa is mounted between the two cut pipe portions 1a and 1b.

  FIG. 1 shows a longitudinal sectional view, and FIG. 2 shows a transverse sectional view. As shown in FIGS. 1 to 2, the water pipe 1 is provided with a rectangular tubular divided joint body 2 (an example of a fluid pipe) mounted between the two cut pipe portions 1 a and 1 b in a cross-sectional view. Forming a road. The split joint body 2 is composed of two parts divided into two in the vertical direction, and these two parts are split T-shaped pipes fastened and fixed to the water pipe 1 by bolts 21a and nuts 21b. An annular elastic seal member 22 that is in close contact with the inner peripheral surface of the divided joint body 2 and in close contact with the outer peripheral surfaces of the two cut pipe portions 1a and 1b is interposed in each of both end portions along the flow path direction. ing. The elastic seal member 22 is compressed and deformed by the pusher wheel 23 along the circumferential direction, whereby the gap between the split joint body 2 and the two cut pipe portions 1a and 1b is sealed. In addition, a push bolt 25 that presses a valve body 3 (described later) downward (in the direction of the bottom 27 of the split joint body 2) is screwed into the upper flange 24 of the split joint body 2. In addition, as a cross-sectional shape of the division | segmentation coupling body 2, it may comprise not only a rectangular cylinder shape but a circular cylinder shape, for example, and is not specifically limited.

  When cutting the water pipe 1, after attaching the split joint body 2 to the water pipe 1, attach a housing for cutting work (not shown) to the upper flange 24 of the split joint body 2, and cut the water pipe 1 with a cutter and split it. A cut portion 11 having a smaller diameter than the neck portion 26 of the joint body 2 is formed in the water pipe 1. Thus, both cutting pipe portions 1a and 1b are formed in the water pipe 1. Next, after the chip discharge operation and the section and cutter removal operation are performed, the gate valve Xa is attached, the push bolt 25 is screwed, and the valve body 3 is pressed downward. Finally, after the valve body 3 is closed and water stoppage is confirmed, the housing for cutting work is removed, and the valve lid 30 is installed to complete the gate valve Xa.

  The gate valve Xa installed in this way has a long valve stem 4 and a valve stem insertion hole 32 (an example of a second through hole) into which the valve stem 4 is inserted along the longitudinal direction. And a body 3. The valve body 3 abuts on the bottom 27 of the split joint body 2 constituting a part of the water pipe 1 to block the flow path. In the present embodiment, the rigidity of the split joint body 2 is increased by thickening the portion of the split joint body 2 that contacts the valve body 3 so as to protrude inward from the periphery.

  As shown in FIG. 1 to FIG. 2 and FIG. 5, an operation unit 41 that rotates itself is provided on the upper portion of the valve stem 4. The valve stem 4 in this embodiment is fixed in a state of being inserted into the valve stem insertion hole 32 of the valve body 3.

  The valve body 3 includes a circular base 31 having a tapered portion 31a with which the tapered surface 25a of the push bolt 25 abuts, and a quadrangular columnar extending portion 33 extending downward from the base 31. Yes. A support portion 34 that supports the operation portion 41 of the valve stem 4 is integrally formed above the base portion 31.

  An annular first seal member Sa is disposed in the base portion 31, and the extending portion 33 has U-shaped second seal members Sb on both sides located on the upstream side and the downstream side of the flow path of the water pipe 1. (An example of a sealing part) is arrange | positioned. The first seal member Sa and the end of the second seal member Sb are connected without a gap. The first seal member Sa is in close contact with the inner peripheral surface of the neck portion 26 of the split joint body 2, and the second seal member Sb is in close contact with and fixed to the bottom portion 27 and the side wall of the split joint body 2. Note that the first seal member Sa and the second seal member Sb may be omitted, and the base portion 31 and the extension portion 33 themselves may have a sealing function.

  As shown in FIGS. 2 to 4, the extending portion 33 includes a housing portion 33 b that is a through-hole having a circular cross section that opens along the flow path direction of the water pipe 1, and a circle that is housed in the housing portion 33 b. And a plate-like valve portion 33a. The valve portion 33a rotates with the center of the valve rod insertion hole 32 into which the valve rod 4 is inserted by fitting or screwing as a fulcrum. That is, the valve rod 4 and the valve portion 33a of the valve body 3 are fixed, and a moving mechanism K that blocks the flow path of the water pipe 1 by rotating the valve portion 33a by the rotation of the valve rod 4 is formed. Yes. The moving mechanism K includes an operation unit 41 that rotates the valve rod 4, a valve rod 4, and a valve rod insertion hole 32 to which the valve rod 4 is fixed.

  As shown in FIGS. 2 to 3, the third seal member Sc is disposed around the outer peripheral portion of the valve portion 33 a and the valve rod insertion hole portion 32, and the valve portion 33 a of the valve body 3 is rotated. The third seal member Sc closes to the inner peripheral surface of the housing portion 33b and is closed to stop water.

  By the way, when the gate valve Xa is installed in both the cutting pipe portions 1a and 1b, the bottom 27 of the split joint body 2 that constitutes a part of the water pipe 1 is cut due to drilling even if chip discharge work is performed. Foreign matter such as powder residue, rust humps, and sand may remain. There is a possibility that the foreign matter may be caught between the bottom portion 27 of the split joint body 2 and the second seal member Sb disposed in the accommodating portion 33b of the valve body 3 to impair the sealing function. On the other hand, because the gate valve Xa has a sealed structure, if the sealed state cannot be confirmed, the flow path may not be blocked when the gate valve Xa is fully closed. That is, it is important to check the sealing state of the gate valve Xa by periodic inspection or the like.

  Therefore, as shown in FIGS. 1 and 5, a water stop confirmation hole that penetrates the valve rod 4 of the gate valve Xa in the present embodiment along the longitudinal direction and allows water leaked from the valve body 3 to flow out to the outside. A portion 43 (an example of a first through-hole portion) is formed. In addition, an on-off valve 42 is connected to the lower side of the operation unit 41 via a connection pipe 44, and the water stop confirmation hole 43 is configured to be able to communicate with the outside by operating the on-off valve 42. . As shown in FIGS. 1 to 2, the water stop confirmation hole 43 of the valve stem 4 and the valve stem insertion hole 32 of the valve body 3 are the first of the valve body 3 that contacts the bottom 27 of the split joint body 2. It opens toward the contact surface Sb1 formed at the tip of the two seal member Sb. Note that the connection pipe 44 in which the on-off valve 42 is arranged is fixed so that only the valve stem 4 can be relatively rotated, and an O-ring Sd is arranged between the valve stem 4 and the connection pipe 44 to the outside. It has a structure that prevents water leakage. As a result, the on / off valve 42 does not rotate together with the rotation of the valve rod 4, so that the working space can be reduced.

  Further, a split joint body is provided on the outer surface of the extending portion 33 of the valve body 3 between the contact surface Sb1 of the upstream second seal member Sb and the contact surface Sb1 of the downstream second seal member Sb. A concave portion 35 is formed on the side of the bottom portion 27, and a groove portion 36 communicating with the concave portion 35 is formed along the circumferential direction (see FIG. 5). The recessed portion 35 and the groove portion 36 are integrally formed in a U shape on the outer surface of the extending portion 33, and the opening of the valve stem insertion hole portion 32 faces the recessed portion 35. In addition, in the extension part 33 of the valve body 3, the recessed part 35 and the groove part 36 may be abbreviate | omitted, and only the groove part 36 may be abbreviate | omitted and it does not specifically limit. In addition, the range in which the groove portion 36 is formed in the circumferential direction of the extending portion 33 is preferably a range extending over the arrangement region of the second seal member Sb, but may be a part of the arrangement region of the second seal member Sb. It is not limited.

  Thus, in this embodiment, when the valve body 3 is in the fully closed state, the water stop confirmation hole portion 43 of the valve rod 4 and the valve rod insertion hole portion 32 of the valve body 3 are connected to the bottom portion 27 of the split joint body 2. No water leaks to the outside only by opening toward the abutting surface Sb1 of the valve body 3 that abuts. On the other hand, when the adhesion between the bottom 27 of the split joint body 2 and the abutting surface Sb1 of the valve body 3 is impaired, the leaked water passes through the opening of the valve rod insertion hole 32 and the water stop confirmation hole 43. And flows out from the upper portion of the valve rod 4 through the open / close valve 42. For this reason, the sealing state of the gate valve Xa can be confirmed.

  Further, after the valve portion 33a of the valve body 3 is closed by the moving mechanism K, it is only necessary to confirm the leakage of water from the water stop confirmation hole portion 43. Therefore, the working efficiency is improved as compared with the case where a separate branch port is provided. Extremely high and can save work costs.

  Moreover, if the recessed part 35 is formed between each 2nd sealing member Sb, the water which leaked from the 2nd sealing member Sb will distribute | circulate to the water stop confirmation hole part 43 via the recessed part 35, and will be discharged | emitted. For this reason, when the sealing function of the second seal member Sb is impaired, the leaked water can quickly flow into the concave portion 35 having a low fluid resistance and be smoothly guided to the water stop confirmation hole portion 43. . As a result, the sealing state of the second seal member Sb can be detected with high accuracy. In addition, since the foreign matter pushed away by the second seal member Sb can be accommodated in the recess 35, the probability of foreign matter biting compared with the case where the entire tip of the valve body 3 is brought into contact with the bottom 27 of the split joint body 2. Is reduced, and the sealing function of the second seal member Sb is hardly hindered.

  Furthermore, if the groove part 36 connected to the recessed part 35 is provided along the circumferential direction of the valve body 3, for example, even when water leaks from the side of the second seal member Sb, water is discharged from the groove part 36 to the recessed part 35. Flows out from the water stop confirmation hole 43. That is, the sealing state of every place along the circumferential direction of the split joint body 2 can be confirmed.

[Second Embodiment]
The gate valve Xb which concerns on 2nd embodiment is shown by FIGS. 6-8. In this embodiment, after piercing the water pipe 1A (an example of a fluid pipe), the gate valve Xb is attached to the pipe piercing port 1c.

  6 and 8 are longitudinal sectional views, and FIG. 7 is a transverse sectional view. As shown in FIGS. 6 to 7, a split joint body 2 </ b> A configured in a T shape in a cross-sectional view is attached to the water pipe 1 </ b> A. The split joint body 2A is composed of two parts divided into two in the vertical direction, and these two parts are fastened and fixed to the water pipe 1A by bolts 21c and nuts 21d. An elastic seal member 22a that is in close contact with the inner peripheral surface of the divided joint body 2A and in close contact with the outer peripheral surface of the water pipe 1A is interposed at each of both end portions along the flow path direction. On the outside of the elastic seal member 22a, locking bolts 28 are inserted into a plurality of locations along the circumferential direction of the divided joint body 2A, and the locking bolts 28 are brought into contact with the outer surface of the water pipe 1A. Xb is prevented from moving in the flow path direction or tilting direction.

  When drilling the water pipe 1A, after attaching the split joint body 2A to the water pipe 1A, a housing for drilling work (not shown) is attached to the upper flange 24a of the split joint body 2A, drilled with a cutter, and the inner diameter of the water pipe 1A A smaller-diameter pipe perforation port 1c is formed in the water pipe 1A. Next, after performing the chip discharging operation and the section and cutter removing operation, the gate valve Xb having the sealed valve lid 30a is lowered, and the valve lid 30a and the upper flange 24a of the split joint body 2A are bolted. 21e is screwed into the female screw portion 21f of the valve lid 30a to fix it in a watertight state. Next, the valve body 3a is pressed against the bottom 1d of the water pipe 1A by the moving mechanism Ka described later, and after confirming the water stop, the drilling housing is removed, and the installation of the gate valve Xb to the pipe drilling port 1c is completed.

  The gate valve Xb installed in this way has an elongated valve stem 4a having a male screw formed on the outer periphery, and a valve stem insertion hole 32a into which the valve stem 4a is inserted (an example of a second through hole). And a valve body 3a. The valve body 3a abuts against the inner surface of the bottom 1d of the water pipe 1A and blocks the flow path of the water pipe 1A.

  As shown in FIG. 6, the operation part 41a which rotates itself is provided in the upper part of the valve rod 4a. In addition, the valve stem 4a in this embodiment is the same shape as FIG. 5 except that the external thread is formed in the outer periphery.

  The valve body 3a is formed by applying a rubber lining 38 made of a seal material to a valve body core. As shown in FIGS. 6 to 7, the rubber lining 38 has a circumferentially extending flange portion 38 a and an arc-shaped portion extending downward from the flange portion 38 a and extending along the inner peripheral surface of the water pipe 1 </ b> A. And an extending portion 38b having contact surfaces 38b1 and 38b2. Accordingly, as shown in FIG. 7, when the valve body 3a is pressed against the bottom 1d of the water pipe 1A, the contact surfaces 38b1 and 38b2 of the extending part 38b are compressed along the bottom 1d of the water pipe 1A. The side wall of the extending portion 38b expands in the radially outward direction and comes into close contact with the inner surface of the water pipe 1A. That is, in the extension part 38b, both side parts located on the upstream side and the downstream side of the flow path have both sealing parts 39a and 39b in close contact with the inner surface of the water pipe 1A. Both contact surfaces 38b1 and 38b2 are formed at the tip of 39b. At the same time, the collar portion 38a comes into close contact with the pipe perforation port 1c, and the flow path of the water pipe 1A is blocked.

  Further, as shown in FIG. 7, a rectangular screw piece 38c having a female screw formed on the inner periphery is engaged with an upper portion adjacent to the flange portion 38a of the valve body 3a, and the female screw of the screw piece 38c is locked. Is screwed into a male screw formed on the outer periphery of the valve stem 4a. Thereby, the valve body 3a moves straight along with the screw piece 38c by the rotation of the valve stem 4a. That is, the moving mechanism Ka that moves the valve body 3a in the direction of blocking the flow path of the water pipe 1A includes the operation portion 41a that rotates the valve rod 4a, the valve rod 4a, and the screw piece 38c.

  The valve stem 4a of the gate valve Xb in the present embodiment is penetrated along the longitudinal direction and the water stop confirmation hole 43a (first filter) that allows water leaked from the valve body 3a to flow out to the outside as in the first embodiment. An example of a through-hole part is formed. Further, an on-off valve 42a is connected via a connecting pipe 44a adjacent to the lower side of the operation portion 41a, and the water stop confirmation hole portion 43a is configured to be able to communicate with the outside by operating the on-off valve 42a. . As in the first embodiment, the connection pipe 44a in which the on-off valve 42a is arranged is fixed so that only the valve stem 4a can be relatively rotated, and an O-ring is provided between the valve stem 4a and the connection pipe 44a. Sda is arranged to prevent leakage to the outside.

  As shown in FIGS. 6 to 7, when the valve body 3a is fully closed, the water stop confirmation hole 43a of the valve rod 4a and the valve rod insertion hole 32a of the valve body 3a are connected to the bottom 1d of the water pipe 1A. It opens toward the contact surfaces 38b1 and 38b2 of the extending part 38b of the valve body 3a that contacts. On the other hand, when the gate valve Xb is in the open state, the valve body 3a is accommodated in the valve lid 30a and the split joint body 2A, and the flow path of the water pipe 1A is completely opened (FIG. 8). reference).

  On the outer surface of the extending portion 38b of the valve body 3a, a recess 35a is formed between the respective contact surfaces 38b1 and 38b2, and a groove 36a communicating with the recess 35a is formed along the circumferential direction. The concave portion 35a and the groove portion 36a are integrally formed in a U shape on the outer surface of the extending portion 38b, and the opening of the valve stem insertion hole portion 32a faces the concave portion 35a. In addition, in the extension part 38b of the valve body 3a, the recessed part 35a and the groove part 36a may be abbreviate | omitted, and only the groove part 36a may be abbreviate | omitted and it does not specifically limit. Further, in the circumferential direction of the extending portion 38b, the range in which the groove portion 36a is formed is preferably a range extending over the arrangement region of the sealing portions 39a and 39b, but even in a part of the arrangement region of the sealing portions 39a and 39b. Well not particularly limited.

  In addition, since this embodiment has the same operational effects as the first embodiment, detailed description thereof is omitted.

[Third embodiment]
9 to 11 show a gate valve Xc according to the third embodiment. In the present embodiment, a valve body 3b is accommodated in a valve box 1B (an example of a fluid pipe) connected to a water pipe (not shown), and a valve lid 30b is attached to the valve box 1B so that the gate valve Xc It is configured. In addition, it may replace with the valve box 1B and you may install the gate valve Xc in the existing water pipe, and it does not specifically limit.

  9 and 11 are longitudinal sectional views, and FIG. 10 is a transverse sectional view. A branch pipe portion 1e is integrally provided in the valve box 1B, and a valve lid 30b is attached to the branch pipe portion 1e. The branch pipe portion 1e is composed of a neck portion 1f extending upward from a portion constituting the flow path of the valve box 1B, and a flange portion 1g formed at an end portion of the neck portion 1f. A valve lid 30b is fastened and fixed to the flange portion 1g in a watertight state by bolts 21g and nuts 21h.

  As shown in FIG. 9, the gate valve Xc includes a long valve rod 4 b having a male screw formed on the outer periphery, and a valve rod insertion hole portion 32 b (an example of a second through hole portion) into which the valve rod 4 b is inserted. ) Having a valve body 3b. The valve body 3b abuts against the inner surface of the bottom 1h of the valve box 1B and blocks the flow path of the valve box 1B.

  In addition, an operation portion 41b that rotates itself is provided on the upper portion of the valve rod 4b. The valve stem 4b in the present embodiment has the same shape as that shown in FIG. 5 except that a male screw is formed on the outer periphery.

  The valve body 3b includes a main body portion 5, and both side portions of the main body portion 5 positioned on the upstream side and the downstream side of the flow path are in close contact with the inner surface of the valve box 1B (an example of a sealing portion). )have. Both contact surfaces Se1 are formed at the tips of the both seal members Se. The main body 5 of the present embodiment is configured to be inclined so as to decrease in diameter toward the lower side (the direction of the bottom 1h of the valve box 1B). Note that both the sealing members Se may be omitted, and the main body 5 itself may have a sealing function.

Further, a rectangular screw piece 50 having a female screw formed on the inner periphery is engaged with the upper portion of the main body 5 of the valve body 3b, and the female screw of the screw piece 50 is formed on the outer periphery of the valve rod 4b. Screwed into the male thread. As a result, the valve element 3b moves linearly together with the screw piece 50 by the rotation of the valve stem 4b. That is, the moving mechanism Kb that moves the valve body 3b in the direction of blocking the flow path of the valve box 1B includes the operation portion 41b that rotates the valve rod 4b, the valve rod 4b, and the screw piece 50. As described above, since the main body 5 is inclined so as to reduce in diameter downward, the sliding resistance between the outer surface of the valve body 3b and the inner surface of the branch pipe portion 1e is small, and the valve body 3b moves smoothly. Can be made.

  In the valve stem 4b of the gate valve Xc in the present embodiment, a water stop confirmation hole that penetrates along the longitudinal direction and flows out the water leaked from the valve body 3b to the outside as in the first embodiment and the second embodiment. A portion 43b (an example of a first through-hole portion) is formed. Further, an on-off valve 42b is connected via a connecting pipe 44b adjacent to the lower part of the operation portion 41b, and the water stop confirmation hole portion 43b is configured to be able to communicate with the outside by opening the on-off valve 42b. Yes. Similar to the above-described embodiment, the connection pipe 44b in which the on-off valve 42b is arranged is fixed so that only the valve stem 4b can be relatively rotated, and an O-ring is provided between the valve stem 4b and the connection pipe 44b. Sdb is arranged to prevent leakage to the outside.

  When the valve body 3b is in the fully closed state, the water stop confirmation hole 43b of the valve rod 4b and the valve rod insertion hole 32b of the valve body 3b are both contact surfaces of the valve body 3b that are in contact with the bottom 1h of the valve box 1B. It opens toward Se1 (see FIG. 9). On the other hand, when the gate valve Xc is in the open state, the valve body 3b is accommodated in the neck 1f, and the flow path of the valve box 1B is completely open (see FIG. 11).

  As shown in FIGS. 9-10, the recessed part 35b is formed between both contact surface Se1 in both the sealing members Se of the valve body 3b, and the groove part 36b connected with this recessed part 35b is formed along the circumferential direction. Yes. The recess 35b and the groove 36b are integrally formed in a U shape on the outer surface of the main body 5, and the opening of the valve stem insertion hole 32b faces the recess 35b. In addition, in the main-body part 5 of the valve body 3b, the recessed part 35b and the groove part 36b may be abbreviate | omitted, and only the groove part 36b may be abbreviate | omitted and it does not specifically limit. Further, in the circumferential direction of the main body 5, the range in which the groove 36 b is formed is preferably a range extending over the arrangement region of both seal members Se excluding the locking portion of the screw piece 50, but the range of the arrangement region of both seal members Se. Some are good and not particularly limited.

  In addition, also in this embodiment, since it has the same effect as 1st embodiment and 2nd embodiment, detailed description is abbreviate | omitted.

[Other Embodiments]
(1) In the first embodiment, the rose fly valve in which the valve portion 33a rotates independently of the housing portion 33b has been described as an example. However, a gate valve as in the second embodiment or the third embodiment may be used. There is no particular limitation.
(2) The divided joint bodies 2 and 2A in the first embodiment and the second embodiment are not limited to two divisions, and may be constituted by three or more divisions.
(3) Instead of the grooves 36a and 36b in the second embodiment and the third embodiment, through holes that penetrate to the valve rod insertion holes 32a and 32b are provided, and the valve rod insertion holes 32a and 32b and the valve rod 4a, You may comprise so that leakage water may flow to recessed part 35a, 35b via the clearance gap between 4b.
(4) In the above embodiment, the water pipe is used as an example of the fluid pipe. However, the fluid pipe may be a pipe through which gas or other liquid flows.

  INDUSTRIAL APPLICABILITY The present invention can be used for a gate valve provided in a cutting pipe part, a pipe perforation port, a branch pipe part of an existing pipe, or the like.

1A Water pipe (fluid pipe)
1B Valve box (fluid pipe)
1d, 1h Bottom 2 Split joint body (fluid pipe)
27 Bottom 3, 3a, 3b Valve body 32, 32a, 32b Valve rod insertion hole (second through hole)
35, 35a, 35b Recess 36, 36a, 36b Groove 38b1, 38b2 Contact surface 39a, 39b Sealing part 4, 4a, 4b Valve rod 43, 43a, 43b Water stop confirmation hole (first through hole)
K, Ka, Kb Movement mechanism Sb Second seal member (sealing part)
Sb1 contact surface Se seal member (sealing part)
Se1 contact surface

Claims (3)

A valve stem having a first through-hole portion penetrating along the longitudinal direction and communicating with the outside;
A valve body having a second through-hole portion inserted along the longitudinal direction of the valve stem, and contacting the inner surface of the fluid pipe to block the flow path;
A moving mechanism that moves the valve body in a direction to block the flow path by rotation of the valve stem;
The first through hole portion and the second through hole portion are gate valves that are open toward a contact surface of the valve body that contacts a bottom portion of the fluid pipe. Of the valve body, both side portions located on the upstream side and the downstream side of the flow path have a sealing portion in which the contact surface is formed at the tip while closely contacting the inner surface of the fluid pipe,
2. The gate valve according to claim 1, wherein a recess is formed between the contact surfaces of the sealing portions in the valve body.   The gate valve according to claim 2, wherein a groove portion communicating with the concave portion is formed along the circumferential direction between the respective sealing portions in the valve body.

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