JP7165989B2 - Sluice valve and installation method of the sluice valve - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sluice valve having a valve element capable of closing a flow path by being inserted between a pair of fluid pipes, and a method of installing the sluice valve.

Conventionally, a water pipe as a fluid pipe is cut with a hole saw, and a valve body (in the literature, A gate valve provided with a connecting pipe portion is known (see, for example, Patent Document 1).

The sluice valve described in Patent Document 1 includes a joint ring that seals between the valve body and the water pipe, and an annular seal member is arranged on the inner peripheral surface of the joint ring. When installing this sluice valve, a joint ring is attached to the water pipe in advance, and in a state in which the water pipe and the sluice valve are enclosed in a sealed state by a housing (housing in the literature), the joint ring is attached to the outer periphery of the water pipe by a feeder device. A joint ring is attached between the valve box and the water pipe by sliding along the surface in the pipe axial direction, straddling the arc-shaped cut surface. Then, the gate valve is installed by removing the housing.

JP 2007-170681 A

The sluice valve described in Patent Literature 1 is compact because the housing is removed and the joint ring seals between the valve box and the water pipe. However, in the gate valve described in Patent Document 1, since the ring is moved in the axial direction of the pipe, if there is a burr or the like on the outer peripheral surface of the water pipe, the annular seal arranged on the inner peripheral surface of the ring may be damaged. There is a risk that the material will come into contact with burrs or the like and the function of the annular sealing material will be impaired. Therefore, there is room for improvement from the viewpoint of the durability of the gate valve.

Therefore, a highly durable and compact gate valve and a method for installing the gate valve are desired.

A gate valve according to the present invention is characterized by a valve body that can block a flow path by being inserted between a pair of fluid pipes, and a valve body that is disposed between the pair of fluid pipes and accommodates the valve body. a valve body; and a sealing band that seals between the pair of fluid pipes and the valve body, wherein the sealing band faces the pair of fluid pipes and the end faces of the respective fluid pipes. It is composed of a pair of annular split bodies divided along a plane perpendicular to the axial direction of the fluid pipe so as to individually cover both ends of the valve body, and each of the annular split bodies is connected to the fluid pipe. It has a body portion that seals the valve body and an engaging portion that engages with the engaged portion of the valve body, and is composed of a plurality of divided members divided in the circumferential direction of the fluid pipe. in the point.

In this configuration, the gate valve is composed of the valve body, the valve body, and the sealing band that seals the space between the fluid pipe and the valve body. can be made compact.

Further, the annular divided body of this configuration is composed of a plurality of divided members divided in the circumferential direction of the fluid pipe, and has an engaging portion that engages with the engaged portion of the valve body. That is, since it is possible to attach a plurality of split members from the radial direction of the fluid pipe so as to engage the engaged portion with the engaging portion, it is not necessary to move the sealing band along the pipe axial direction. do not have. As a result, the inner peripheral surface of the sealing band is not damaged by burrs or the like formed on the outer peripheral surface of the fluid pipe, and the durability of the sealing band can be enhanced. Therefore, a highly durable and compact gate valve could be provided.

In another characteristic configuration, the valve box is provided with a protruding portion that protrudes outward from a side surface along the pipe axis direction as the engaged portion, and the annular divided body faces the side surface. It has an extending portion extending from the main body portion so as to do so, and the engaging portion is formed at the tip portion of the extending portion.

If, as in this configuration, the engaged portion is formed by a projecting portion projecting from the side surface of the valve body, and the engaging portion is formed at the tip of the extending portion of the annular divided body, the device configuration is simplified. becomes. Moreover, the strength of the sealing band can be increased by providing the annular split body with an extending portion extending from the main body portion.

Another characteristic configuration is that the protruding portion is formed with an inclined surface whose width in the tube axis direction increases toward the side surface, and the engaging portion is provided with an opposing inclined surface that faces the inclined surface. is formed.

If, as in this configuration, the protruding portion of the valve body is provided with an inclined surface and the engaging portion of the annular divided body is provided with a facing inclined surface, the mounting of the annular divided body to the valve casing is guided by the inclined surface and the facing inclined surface. be done. As a result, the work of mounting the annular segment on the valve body becomes easier.

Another characteristic configuration is that the valve body has a pair of protruding pipe portions that protrude from the valve body body in the pipe axial direction, and the fluid pipe and the protruding pipe portion are provided on the inner surface of the body portion. A first annular protrusion that contacts the outer peripheral surface of the fluid pipe and a second annular protrusion that contacts the outer peripheral surface of the protruding pipe are formed on the seal member so as to protrude. in that it is

As in this configuration, the sealing member arranged on the inner surface of the main body of the annular divided body has a first annular protrusion that contacts the outer peripheral surface of the fluid pipe and a second annular protrusion that contacts the outer peripheral surface of the protruding pipe portion of the valve body. By providing the annular convex portion, it is possible to reliably block the fluid flowing out from between the fluid pipe and the projecting pipe portion.

Another characteristic configuration is that the pair of end faces are a pair of arcuate cut surfaces that approach toward an intermediate position of the fluid pipe with respect to the insertion/extraction direction of the valve body, and the projecting pipe portion has the arcuate The point is that arcuate end faces are formed so as to be opposed along the cut surface.

As in this configuration, if the protruding pipe portion of the valve body is provided with an arc-shaped end face facing the arc-shaped cut surface of the fluid pipe, the valve body can be brought closer to the arc-shaped cut surface, making the gate valve more compact. is planned. Moreover, since the fluid flowing through the fluid pipe is smoothly guided by the projecting pipe portion of the valve box, the pressure loss can be reduced.

Another characteristic configuration is that the bottom surface of the valve box is formed with a bottom recess for positioning.

By forming the bottom concave portion for positioning in the bottom surface of the valve box as in this configuration, the mounting position of the valve box with respect to the fluid pipe becomes accurate. As a result, the sealing band can reliably seal between the fluid pipe and the valve body.

Another feature resides in that each of said split members comprises a pair of semi-cylindrical members that are joined together.

As in this configuration, if the split member is composed of two semi-cylindrical members, it is easy to attach the split member from the radial direction.

Another feature is that the split surfaces of the pair of semi-cylindrical members are formed with recesses and protrusions that fit into each other.

If the split surface of the semi-cylindrical member is provided with an uneven shape as in this configuration, it becomes easier to mount the split member in the radial direction.

Another feature is that the ends of the pair of semi-cylindrical members are hinged.

If the ends of the semi-cylindrical member are hinged as in this configuration, the open semi-cylindrical member is attached to the fluid pipe or the valve box in advance, and the valve case is arranged between the pair of fluid pipes. If the closing operation is performed in this state, the attachment of the sealing band is completed, so workability is enhanced.

Another characteristic configuration is that a movement prevention mechanism is provided on the side of the main body opposite to the valve box and prevents the annular split body from moving in the pipe axis direction.

By providing a movement prevention mechanism as in this configuration, it is possible to reliably prevent movement of the sealing band in the direction of the tube axis.

Another characteristic configuration is that the inner peripheral surface of the annular divided body is formed with a claw portion that bites into the fluid pipe.

By providing the claw portion that bites into the fluid pipe on the inner peripheral surface of the annular divided body as in this configuration, it is possible to reliably prevent the movement of the sealing band in the direction of the pipe axis. Moreover, since it is sufficient to simply provide the claw portion on the main body portion, the number of parts can be saved.

Another characteristic configuration is that an annular recess is formed on the outer peripheral surface of the fluid pipe, and an annular protrusion that fits into the annular recess is formed on the inner peripheral surface of the annular divided body. It is in.

By fitting the annular concave portion of the fluid pipe into the annular convex portion of the annular divided body as in this configuration, it is possible to reliably prevent the movement of the sealing band in the tube axial direction. Moreover, it is only necessary to provide the annular concave portion on the fluid pipe and the annular convex portion on the annular divided body, so that the number of parts can be saved.

The installation method of the gate valve according to the present invention is characterized by a valve body capable of closing a flow path by being inserted between a pair of fluid pipes, a valve box containing the valve body, and a pipe of the fluid pipe. a sealing band composed of a pair of annular split bodies divided in the axial direction, wherein the annular split body is formed of a plurality of split members divided in the circumferential direction of the fluid pipe; A method for installing a sluice valve to be installed in a pipe, comprising: a housing mounting step of sealingly mounting a housing in which the sealing band is accommodated to the fluid pipe; and cutting the fluid pipe by a cutting device inside the housing. a fluid pipe cutting step of forming a pair of arc-shaped cut surfaces that become closer toward an intermediate position of the fluid pipe with respect to the inserting/removing direction of the valve body; a valve box installation step of inserting the valve box containing the valve body between them; and operating an operation unit provided outside the case to move the divided member in the radial direction of the fluid pipe, The present invention includes a sealing band attaching step of sealingly covering a space between the fluid pipe and the valve box with the sealing band, and a housing removing step of removing the housing from the fluid pipe.

In this method, a sealing band is housed in the housing in advance, and an operating portion provided outside the housing is operated to move the split member to attach the sealing band between the fluid pipe and the valve box, Installation of the sluice valve is completed by removing the housing from the fluid pipe. In this way, since the gate valve is composed of the valve body, the valve body, the fluid pipe, and the sealing band that seals the space between the valve body and the valve body, the gate valve can be made compact without leaving a housing. be able to.

In addition, in this method, since the plurality of split members are attached from the radial direction of the fluid pipe, there is no need to move the sealing band along the pipe axial direction. As a result, the inner peripheral surface of the sealing band is not damaged by burrs or the like formed on the outer peripheral surface of the fluid pipe, and the durability of the sealing band can be enhanced. Therefore, a method for installing a highly durable and compact gate valve could be provided.

Another feature is that in the sealing band mounting step, the split member is slid while being guided by a holding portion provided at the bottom of the housing for holding the split member.

As in this method, the lateral movement of the split members is guided by the holding portion provided at the bottom of the housing, so that the mounting positions of the plurality of split members with respect to the fluid pipe and the valve body are accurate. As a result, the sealing band can reliably seal between the fluid pipe and the valve body.

1 is a perspective view of a gate valve according to a first embodiment; FIG. It is a top view of a gate valve concerning a first embodiment. It is a side view in the state where one division member was removed. FIG. 2 is a cross-sectional view taken along line IV-IV of FIG. 1; It is a perspective view of a valve box. It is a perspective view of the valve body seen from the bottom side. It is the perspective view which shows the state which mounted|worn the sealing band seen from the bottom face side. It is a figure which shows the state which mount|wears one division member with a sealing member. 4 is a perspective view of a lower case of the housing; FIG. FIG. 4 is a conceptual diagram showing a fluid pipe cutting process; It is a conceptual diagram which shows a valve box installation process. It is sectional drawing which shows a valve box installation process. It is a conceptual diagram which shows a sealing band mounting|wearing process. It is a side view of the gate valve which concerns on 2nd embodiment. It is a sectional view of a gate valve concerning a second embodiment. It is a top view of the gate valve which concerns on the modification of 2nd embodiment. It is a sectional view of a gate valve concerning a third embodiment. It is a side view of the state which removed one division member which concerns on 3rd embodiment. It is a perspective view of the valve box which concerns on 3rd embodiment. It is a state figure which mounts|wears with a sealing member to one division|segmentation member of 3rd embodiment. It is the perspective view which looked at the sealing band which concerns on 4th embodiment from the inside. It is an expansion perspective view of the gate valve which concerns on 5th embodiment. It is a side view of the gate valve which concerns on 6th embodiment. It is a rear view of the sealing band which concerns on 6th embodiment. It is a sectional view of a gate valve concerning a sixth embodiment. FIG. 11 is a front view of a sealing band according to another embodiment;

EMBODIMENT OF THE INVENTION Below, embodiment of the installation method of the gate valve which concerns on this invention, and a gate valve is described based on drawing. In this embodiment, as an example of a gate valve, a gate valve 1 installed in a water pipe W (an example of a fluid pipe) will be described. However, without being limited to the following embodiments, various modifications are possible without departing from the scope of the invention. Hereinafter, the direction of gravity may be referred to as the bottom, and the direction opposite to the direction of gravity may be referred to as the top.

[First embodiment]
As shown in FIGS. 1 to 4, the sluice valve 1 includes a valve cover 11, a valve body 12, a sealing band 13, and a movement prevention mechanism . Moreover, as shown in FIG.

As shown in FIGS. 1 to 3, the valve lid 11 includes a valve lid flange 11a fastened to the valve body flange 12a of the valve body 12 with bolts and nuts, and a valve lid side housing the valve element 15 in the open state. It has an accommodating portion 11b and an operated portion 11c which is provided on the upper portion of the valve cover side accommodating portion 11b and which is rotated using an operating tool (not shown). The valve lid 11 includes a direct acting mechanism that moves the valve body 15 straight by rotating the operated portion 11c. This direct-acting mechanism moves the valve body 15 straight by either forward movement for closing the water pipe W or backward movement for opening the water pipe W.

As shown in FIGS. 3 and 4, the valve box 12 is inserted between arc-shaped cut surfaces 20 of a pair of water pipes W1 and W2 formed by cutting the water pipe W. As shown in FIGS. The valve body 12 includes a valve body side housing portion 12A (an example of a valve body main body) that houses the valve body 15, and a pair of intersecting planes 12Aa that are planes that intersect the pipe axial direction X, and extend in the pipe axial direction X of the water pipe W. It has a pair of protruding pipe portions 12B that protrude toward the water pipes W1 and W2 along (hereinafter referred to as "pipe axial direction X").

As shown in FIG. 5, the valve body housing portion 12A is box-shaped having a pair of intersecting surfaces 12Aa that are planes that intersect the pipe axis direction X and a pair of side surfaces 12Ab that are planes along the pipe axis direction X. is formed in The pair of intersecting surfaces 12Aa is located on the valve lid 11 side and has a constant width in the pipe axial direction X. The pair of base end surfaces 12Aa1 and the base end surface 12Aa1 are connected to each other, and the pipe gradually expands toward the distal direction (downward) from the connecting portion of the base end surface 12Aa1. It is composed of a pair of tapered surfaces 12Aa2 with a narrower width in the axial direction X and a pair of tip surfaces 12Aa3 perpendicular to the tube axial direction X in a region from a connection site with the tapered surfaces 12Aa2 to the tip. Further, a reinforcing plate 21 that connects the tip surfaces 12Aa3 is formed on the inside of each tip surface 12Aa3 in the vicinity of the connecting portion with the tapered surface 12Aa2. A pair of side surfaces 12Ab are formed with U-shaped protruding portions 12Ab1 (an example of engaged portions) that protrude outward. A pair of outer ends of the protruding portions 12Ab1 are formed with inclined surfaces 12Ab2 whose width in the pipe axial direction X increases toward the side surfaces 12Ab (toward the center of the water pipe W).

As shown in FIGS. 6 and 7, the bottom surface of the valve box housing portion 12A is formed with a bottom recess portion 12Ac for positioning in the central portion and a pair of support leg portions 12Ad that serve as mounting portions during transportation. ing. In addition, a lightening portion 12Ae serving as a space is formed in a region surrounded by the pair of support leg portions 12Ad, the bottom recessed portion 12Ac, and the pair of tip surfaces 12Aa3.

Each protruding pipe portion 12B is formed in a cylindrical shape having the same diameter as the water pipe W, and each protruding pipe portion 12B has a flat end surface 12Ba facing the arc-shaped cut surface 20 of the pair of water pipes W1 and W2. is formed. Although the details will be described later, the water pipe W cut by the rotating hole saw 5 is provided with a pair of circular arc-shaped parts that approach the middle position of the water pipe W in the side view with respect to the insertion/extraction direction Y of the valve body 15 . A circular cut surface 20 is formed (see FIG. 3).

As shown in FIG. 4, the sealing band 13 covers between the pair of water pipes W1, W2 and the valve box 12 in a sealed state. The sealing band 13 separates the arc-shaped cut surfaces 20 (water pipe W) of the pair of water pipes W1 and W2 and the pair of flat end surfaces 12Ba (both ends of the valve body 12) facing the arc-shaped cut surfaces 20, respectively. It is composed of a pair of annular split bodies B split along a plane perpendicular to the tube axis direction X so as to cover the tube. As shown in FIGS. 1 to 4, each annular split body B is composed of a pair of split members Ba further split in the circumferential direction of the water pipe W, and the respective split members Ba are joined together. It is composed of a pair of semi-cylindrical members (an example of a plurality of divided members). Each split member Ba is formed in the same shape, and one split member Ba is joined to the other split member Ba in a state where it is rotated 180 degrees around the tube axis direction X. As shown in FIG.

The annular split body B to which the pair of split members Ba are joined extends from the main body B1 that covers the water pipe W and the valve box 12 in a sealed state, and the main body B1 so as to face the side surface 12Ab of the valve box 12. and an extension B2 (see also FIG. 7).

The body portion B1 has an annular portion 22 and a pair of joint portions 23 projecting outward from both end portions of the annular portion 22 and for joining the pair of divided members Ba with a fastening bolt 16a and a fastening nut 16b. (See FIGS. 1-2).

As shown in FIG. 8, the inner surface of the annular portion 22 is formed with a seal groove 22a in which the seal member S is mounted. A first flat wall portion 22a1 perpendicular to the pipe axis direction X is formed on the side facing the outer peripheral surface of the projecting pipe portion 12B of the valve box 12 in the seal groove 22a, and faces the outer peripheral surface of the water pipe W. A second flat wall portion 22a2 orthogonal to the pipe axis direction X is formed on the side to be located. Fitting grooves 22a3 into which fitting leg portions Sb of the sealing member S, which will be described later, fit are formed in the split surfaces of the pair of divided members Ba (semi-cylindrical members).

The seal member S includes a tight contact portion Sa that is in close contact with the outer peripheral surface of the opposing portion of the protruding pipe portion 12B of the valve box 12 and the water pipe W, and a tight contact portion Sa that protrudes outward and is fitted into the fitting groove 22a3 of the seal groove 22a. and a fitting leg Sb (see FIGS. 4 and 8). In the tight contact portion Sa, a first annular protrusion Sa1 having a linear shape in a side view and contacting the outer peripheral surface of the projecting pipe portion 12B of the valve body 12, and two second annular protrusions Sa2 contacting the outer peripheral surface of the water pipe W are provided. , Sa3 are formed to protrude. Of the two second annular projections Sa2 and Sa3 that abut on the outer peripheral surface of the water pipe W, one of the second annular projections Sa2 on the side of the valve body 12 is arranged along the arc-shaped cut surface 20 of the water pipe W. , and the other second annular convex portion Sa3 on the side of the anti-movement mechanism 14 is formed in a linear shape when viewed from the side. In this way, the seal member S arranged on the inner surface of the main body portion B1 of the annular divided body B is provided with the first annular convex portion Sa1 that contacts the outer peripheral surface of the protruding pipe portion 12B of the valve box 12, and the outer periphery of the water pipe W. By providing the two second annular protrusions Sa2 and Sa3 that abut on the surface, it is possible to reliably prevent water leakage from between the water pipe W and the projecting pipe portion 12B. Any one of the second annular protrusions Sa2 and Sa3 may be omitted.

As shown in FIG. 4, a movement prevention mechanism 14 is integrally formed at the outer end of the annular portion 22 of the annular split body B. As shown in FIG. The movement prevention mechanism 14 is located on the side opposite to the valve body 12 and prevents movement of the annular split body B in the pipe axis direction X. As shown in FIG. The movement prevention mechanism 14 includes a pair of split pressing bodies 14A formed integrally with the annular portion 22, and a plurality of (six in this embodiment) retainers capable of biting into the outer peripheral surface of the water pipe W. 14B (see also FIGS. 1-2). A connecting bolt 14Ab1 and a connecting nut 14Ab2 for connecting the pair of split presser bodies 14A are provided across the joints 23 formed at the circumferential ends of the pair of split presser bodies 14A. A plurality (six in the present embodiment) of push bolts 14Ab3 are inserted between the connection bolt 14Ab1 and the connection nut 14Ab2 of the divided pressing member 14A. The retainer member 14B is movably mounted in recessed accommodation portions 14Ba formed at a plurality of locations in the circumferential direction of the inner peripheral surface of the split pressing member 14A. The member 14B is configured to move radially inward and bite into the outer peripheral surface of the water pipe W. As shown in FIG.

As shown in FIGS. 1 and 2, the pair of joints 23 are formed on the opposite side of the extending portion B2 at a position that does not interfere with the annular side wall 22b. B) are fastened with fastening bolts 16a and fastening nuts 16b. Further, as shown in FIG. 8, a plurality of (two in the present embodiment) convex portions 23b1 are formed on one of the split surfaces of the joint portion 23, and a plurality of (two in the present embodiment) protrusions 23b1 are formed on the other split surface. 2) recesses 23b2 are formed. In this way, the protrusions 23b1 and the recesses 23b2 of the joint portion 23 form uneven shapes that fit together on the split surfaces of the pair of split members Ba (semi-cylindrical members). Further, on the outer surface of the joint portion 23, a plurality of protrusions 33A (near the positions of the convex portion 23b1 and the concave portion 23b2) that engage with the protrusions 33A of the holding portion 33 provided on the housing 3 (bottom wall 3Ab of the lower case 3A) are provided. , two engaging grooves 23c are formed in a concave shape.

As shown in FIGS. 7 and 8, the extending portion B2 is formed on the proximal end portion 24 connected to the annular portion 22 and the distal end side of the proximal end portion 24, and is engaged with the projecting portion 12Ab1 of the valve body 12. It has an engaging portion 25 that engages.

The proximal end portion 24 includes a facing wall portion 24a that faces the intersecting surface 12Aa (mainly the tapered surface 12Aa2 and the distal end surface 12Aa3) of the valve body housing portion 12A, and a curved wall portion bent in the pipe axis direction X from the facing wall portion 24a. 24b. The engaging portion 25 is formed at the tip of the curved wall portion 24b and has a recessed groove portion 25a. A facing inclined surface 25a1 facing the inclined surface 12Ab2 of the projecting portion 12Ab1 is formed in the concave groove portion 25a (see FIG. 4). Although the details will be described later, when the pair of divided members Ba are moved from the radially outer side toward the radially inner side and attached to the valve body 12, the opposing inclined surface 25a1 contacts the inclined surface 12Ab2 of the projecting portion 12Ab1, A dividing member Ba is guided.

Next, the gate valve installation device 10 used for the installation method of the gate valve 1 will be described. As shown in FIGS. 10 and 11, the sluice valve installation device 10 includes the sluice valve 1 described above, a cutting device 2 for cutting the water pipe W, and a housing covering the water pipe W in a state where the work valve 4 is connected. 3 and an elevating device C capable of lowering the valve box 12 in which the valve body 15 is accommodated.

As shown in FIG. 10, the cutting device 2 includes a driving portion 27 composed of an electric motor, an engine, etc., a connection case 31 connected to the work valve 4, a casing 28 connected to the connection case 31, a casing and a hole saw 5 connected to a connecting flange portion 29A at the tip of the drive rotating shaft 29 so as to be interchangeable with other types of hole saws. ing. An upper connection flange portion 31A of a connection case 31 capable of accommodating a portion of the hole saw 5 is fixedly connected to the lower connection flange portion 28A of the casing 28 by fastening members such as bolts and nuts. The hole saw 5 is formed to have a larger diameter than the outer diameter of the water pipe W. The hole saw 5 is composed of a cylindrical body 5A having a cutting tip at its tip, and a center drill 5B projecting forward beyond the cutting tip through the center of the cylindrical body 5A. Further, the center drill 5B is provided with a pair of retaining pieces 5C which can be undulated and swung to prevent the cut-and-remove tube from coming out of the cylindrical body 5A. The cutting device 2 applies a drive rotation force and a feed force to the drive rotation shaft 29 by driving the driving unit 27, and the hole saw 5 connected to the drive rotation shaft 29 is cut through the work valve 4 opened. It is configured to cut the water pipe W into a cylindrical shape by feeding it while rotating it along the vertical direction (insertion/removal direction Y) perpendicular to the axial direction X. As shown in FIG. As a result, as shown in FIG. 11, the water pipe W has a pair of arcuate cut surfaces that are arcuate in side view and that approach toward an intermediate position in the side view of the water pipe W with respect to the insertion/removal direction Y of the valve body 15. 20 are formed.

The housing 3 consists of a half-split lower case 3A that is externally fitted from below, a half-split upper case 3B that is fitted onto the water pipe W from above, and a work of connecting the upper case 3B. a valve 4; Both cases 3A and 3B are flange-joined in a detachable and sealed state by fastening members such as bolts and nuts (not shown). A valve case 4A of the working valve 4 is attached in a sealed state by fastening members such as bolts and nuts. A valve case 4A of the working valve 4 is provided with a working valve body 4C that can be opened and closed in a horizontal direction and an operation handle 4D for opening and closing the working valve body 4C. The upper end of the working valve 4 is integrally formed with an upper connecting flange portion 4B which is detachably fixed and connected to the lower connecting flange portion 31B of the connecting case 31 by fastening members such as bolts and nuts.

As shown in FIG. 9, the lower case 3A is formed in the shape of an open-top box having side walls 3Aa and a bottom wall 3Ab. A pair of inwardly bent stepped portions 3Ac are formed between a pair of side walls 3Aa and a bottom wall 3Ab in the longitudinal direction (along the tube axis direction X). When the housing 3 is attached to the water pipe W in a sealed state, the body portion B1 of the divided member Ba is supported by the stepped portion 3Ac (see FIG. 13). On the side surface of the stepped portion 3Ac, a plurality of (six in this embodiment) through-holes into which pusher members P (an example of an operation portion) capable of pushing the divided member Ba inward (in the direction of the water pipe W) are inserted. A portion 3Ac1 is formed.

A holding portion 33 that holds the joint portion 23 of the divided member Ba is fixed to the bottom wall 3Ab by adhesion, screwing, fitting, or the like (see FIG. 12). The holding portion 33 is provided along the radial direction in the region between the pair of stepped portions 3Ac so that the split member Ba is mounted at a predetermined position between the water pipe W and the valve box 12 . At the central portion of the upper surface of the holding portion 33, a plurality of (two in this embodiment) protrusions 33A that engage with the engaging grooves 23c formed on the outer surface of the joint portion 23 are sandwiched between the pair of stepped portions 3Ac. are provided along the radial direction over the The engagement groove 23c and the projection 33A position the split member Ba at a predetermined position, and constitute a guide mechanism for sliding the split member Ba from the side of the water pipe W by the pusher member P. As shown in FIG. As shown in FIGS. 9 and 12, the bottom wall 3Ab integrally protrudes with a positioning pin 3Ab1 that is inserted into a bottom recess 12Ac formed in the bottom of the valve body housing 12A. When arranging the valve box 12 between the pair of water pipes W1 and W2 inside the housing 3, the relative position between the valve box 12 and the housing 3 is determined by inserting the positioning pin 3Ab1 into the bottom recess 12Ac. .

As shown in FIG. 11, the lifting device C is supported by an upper housing H hermetically connected to the work valve 4 and a lid 34 of the upper housing H, and is supported by a connecting portion 36A for a lifting driving portion such as a lane or winch. and a lifting jig 37 connected to the lifting operation shaft 36 for detachably suspending and supporting the valve body 12 and the inner surface of the lid body 34 . It has a flange portion 38 integrally suspended with the housing H for transportation.

Next, a method for installing the gate valve 1 will be described. First, as shown in FIGS. 12 and 13, the body portion B1 of the split member Ba is brought into contact with the stepped portion 3Ac of the lower case 3A, and the engagement groove 23c of the body portion B1 and the protrusion 33A of the holding portion 33 are engaged. A plurality of divided members Ba (in this embodiment, two sets of a pair of divided members Ba) are placed on the holding portion 33 by putting them together.

Next, the lower case 3A, the upper case 3B, and the working valve 4 are attached to the water pipe W, and the plurality of divided members Ba are accommodated inside the housing 3. As shown in FIG. That is, as shown in FIG. 10, the housing 3 (lower case 3A) in which the sealing band 13 (plurality of divided members Ba) is housed is attached to the water pipe W in a sealed state (housing mounting step). Next, the cutting device 2 is attached to the housing 3 in a sealed state, and the hole saw 5 is rotated inside the housing 3 with the work valve 4 open to cut the water pipe W (fluid pipe cutting step). As a result, a pair of arcuate cut surfaces 20 are formed which are arcuate in side view and which approach toward the middle position of the water pipe W in side view in the insertion/removal direction Y of the valve body 15 .

Next, as shown in FIG. 11, the work valve 4 is closed, the cutting device 2 is removed together with the cut-and-remove pipe portion of the water pipe W, and the lifting device C is attached to the housing 3 in a sealed state. Then, the work valve 4 is opened, and the valve body 12 containing the valve body 15 is inserted between the pair of arc-shaped cut surfaces 20 inside the housing 3 by the lifting device C (valve body installation step). ). At this time, since the bottom surface recess 12Ac for positioning is formed in the bottom surface of the valve box 12, the mounting position of the valve box 12 with respect to the water pipe W becomes accurate (see FIG. 12). Next, as shown in FIG. 13, the pusher member P provided on the outside of the housing 3 is pushed in to slide the dividing member Ba from the side of the water pipe W (seal band attaching step). At this time, since the engagement groove 23c of the main body portion B1 and the projection 33A of the holding portion 33 are engaged with each other, the divided member Ba is accurately guided to a predetermined position (see FIG. 12).

Then, the convex portion 23b1 and the concave portion 23b2 of the joint portion 23 of the pair of divided members Ba moved to a predetermined position between the water pipe W and the valve box 12 are fitted, and the pusher member P is rotated to rotate the fastening bolt. A pair of joints 23 are fastened by the fastening nut 16a, the fastening nut 16b, the connection bolt 14Ab1, and the connection nut 14Ab2. As a result, the space between the water pipe W and the valve box 12 is sealed by the sealing band 13 (see also the sealing band attaching step, FIGS. 1 and 2). Next, the housing 3 and the lifting device C are removed from the water pipe W (housing removal step). Then, as shown in FIG. 1, the push bolt 14Ab3 of the movement prevention mechanism 14 is tightened to cause the retaining member 14B to bite into the outer peripheral surface of the water pipe W, thereby moving the annular divided body B in the pipe axis direction X. is prevented, and the gate valve 1 is completed.

In the above-described embodiment, the gate valve 1 is composed of the valve body 15, the valve body 12, and the sealing band 13 that seals between the water pipe W and the valve body 12. Therefore, the housing 3 and the like are The size of the sluice valve 1 can be made compact without leaving it behind. Further, as shown in FIGS. 1 to 4, the annular divided body B in the present embodiment is composed of a plurality of divided members Ba divided in the circumferential direction of the water pipe W, and engages with the projecting portion 12Ab1 of the valve box 12. It has an engaging portion 25 that fits. That is, since it is possible to attach the plurality of divided members Ba from the radial direction of the water pipe W so as to engage the projecting portion 12Ab1 and the engaging portion 25, the sealing band 13 is moved along the pipe axial direction X. No need to move. As a result, the sealing member S attached to the inner peripheral surface of the split member Ba is not damaged by burrs or the like formed on the outer peripheral surface of the water pipe W, and the durability of the sealing band 13 can be enhanced.

Further, as shown in FIG. 7, if the protruding portion 12Ab1 of the valve body 12 is provided with the inclined surface 12Ab2 and the engaging portion 25 of the annular divided body B is provided with the opposed inclined surface 25a1, the inclined surface 12Ab2 and the opposed inclined surface 25a1 The mounting of the annular segment B on the valve body 12 is guided. As a result, the operation of mounting the annular split body B to the valve body 12 becomes easier.

Another embodiment will be described below. Note that members similar to those in the first embodiment are described using the same reference numerals and names in order to facilitate understanding of the drawings.

[Second embodiment]
As shown in FIGS. 14 and 15, the outer surface of the annular portion 22 is formed with a pair of annular side walls 22b facing each other along the tube axis direction X. As shown in FIGS. Of the pair of annular side walls 22 b formed on the outer surface of the annular portion 22 , the annular side wall 22 b on the side opposite to the extending portion B<b>2 is locked by the movement prevention mechanism 14 . That is, in the first embodiment, the anti-movement mechanism 14 was formed integrally with the annular divided body B, but in the present embodiment, the anti-movement mechanism 14 is constructed as a separate member.

The movement prevention mechanism 14 is mounted on the side of the annular split body B opposite to the valve box 12 and prevents the annular split body B from moving in the pipe axis direction X. As shown in FIG. The anti-movement mechanism 14 comprises a pair of halved split pressers including locking portions 14Aa that can be engaged and disengaged from the annular side wall 22b on the side opposite to the extension portion B2 of the valve body 12 from the outside in the radial direction. 14A and a plurality of retaining members 14B that can be bitten into the outer peripheral surface of the water pipe W. The retainer member 14B is mounted movably inward in the radial direction in recessed accommodating portions 14Ba formed at a plurality of locations in the circumferential direction of the inner peripheral surface of the split pressing member 14A. The retainer members 14B are moved radially inward by the diameter-reduced rocking movement of the pair of split pressing bodies 14A associated with the tightening operation of the connecting bolt 14Ab1 and the connecting nut 14Ab2. It is configured to bite into the surface. Since other configurations are the same as those of the first embodiment, description thereof is omitted. As another mounting example of the movement prevention mechanism 14, as shown in FIG. 16, the movement prevention mechanism 14 shown in FIG. It is preferable to install the movement prevention mechanism 14 . As a result, the movement prevention mechanism 14 evenly pulls the pair of divided members Ba, so that the separation prevention force between the annular divided body B and the movement prevention mechanism 14 can be enhanced.

[Third embodiment]
As shown in FIGS. 17 and 18, both ends of the valve box 12 are formed with arcuate end surfaces 12Bb that face each other along the arcuate cut surfaces 20 of the pair of water pipes W1 and W2. The pair of arcuate end surfaces 12Bb in this embodiment are formed in an arcuate shape in side view so as to approach the intermediate position of the water pipe W in the side view with respect to the insertion/removal direction Y of the valve body 15 . In this way, if the protruding pipe portion 12B of the valve box 12 is provided with the arc-shaped end surface 12Bb facing the arc-shaped cut surface 20 of the water pipe W, the protruded pipe portion 12B can be brought closer to the arc-shaped cut surface 20. As a result, the gate valve 1 can be made compact. Moreover, since the water flowing through the water pipe W is smoothly guided by the projecting pipe portion 12B of the valve box 12, the pressure loss can be reduced.

As shown in FIG. 19, due to the shape of the intersecting surface 12Aa of the valve body housing portion 12A and the shape of the arc-shaped end surface 12Bb of the protruding pipe portion 12B, the width Wt of the upper wall of the protruding pipe portion 12B in the pipe axis direction X is is formed to be smaller than the width Wb of the lower wall in the tube axis direction X, and is formed to be larger than the width Ws of the side wall in the tube axis direction X.

As shown in FIG. 20, the sealing groove 22a is formed with an arcuate wall portion 22a4 having an intermediate portion protruding so that the side facing the outer peripheral surface of the projecting pipe portion 12B of the valve body 12 is along the arcuate end surface 12Bb. A flat wall portion 22a2 perpendicular to the pipe axis direction X is formed on the side facing the outer peripheral surface of the water pipe W. As shown in FIG. In addition, the first annular projection Sa1 of the seal member S bulges toward the valve body 12 toward an intermediate position in the side view of the water pipe W so as to follow the circular arc shape of the circular cut surface 20 of the water pipe W in the side view. there is Since other configurations are the same as those of the first embodiment, description thereof is omitted.

[Fourth embodiment]
As shown in FIG. 21, instead of the movement prevention mechanism 14 in the above-described embodiment, an annular claw portion 39 that can bite into the outer peripheral surface of the water pipe W is provided on the inner peripheral surface of the annular divided body B (divided member Ba). (an example of a claw portion) may be provided. The annular claw portion 39 is integrally formed on the inner peripheral surface of the annular side wall 22b on the side opposite to the extending portion B2 of the valve body 12 in the body portion B1. The installation method of the sluice valve 1 in this embodiment can omit the step of mounting the movement prevention mechanism 14 in the above-described embodiment. Moreover, since it is only necessary to provide the annular claw portion 39 on the main body portion B1, the number of parts can be saved.

[Fifth embodiment]
As shown in FIG. 22, instead of the movement prevention mechanism 14 in the above-described embodiment, an annular projection 40 is provided on the inner peripheral surface of the annular divided body B (divided member Ba), and an annular protrusion 40 is provided on the outer peripheral surface of the water pipe W. A concave portion 41 may be formed and the annular convex portion 40 and the annular concave portion 41 may be fitted. The annular convex portion 40 is integrally formed on the inner peripheral surface of the annular side wall 22b on the side opposite to the extending portion B2 of the valve body 12 in the main body portion B1. The installation method of the sluice valve 1 in this embodiment can omit the step of mounting the movement prevention mechanism 14 in the above-described embodiment. Moreover, since it is only necessary to provide the annular convex portion 40 on the main body portion B1 and form the annular concave portion 41 on the outer peripheral surface of the water pipe W, the number of parts can be saved.

[Sixth embodiment]
As shown in FIG. 23, the gate valve 1 includes a valve cover 11, a valve body 12, a sealing band 13, and a movement prevention mechanism 14. As shown in FIG. The valve cover 11, the valve box 12, and the anti-movement mechanism 14 are the same as those in the first embodiment, so description thereof will be omitted. In addition, the valve body 12 may be configured as in the third embodiment, and the anti-movement mechanism 14 may be configured as in the second, fourth, or fifth embodiment. not. In this case, the annular divided body B described above corresponds to the body portion B1 described later.

As shown in FIGS. 23 to 25, the sealing band 13 in this embodiment includes a pair of body portions B1 that sealably cover the water pipes W1 and W2 and the projecting pipe portion 12B of the valve body 12, A connection portion B3 that connects a pair of main body portions B1 in a state of facing a side surface 12Ab along the pipe axis direction X of the housing portion 12A (an example of the valve body) is integrally formed, and is divided in the circumferential direction of the water pipe W. It is composed of a plurality of (two in this embodiment) divided members Ba.

The body portion B1 has an annular portion 22 and a pair of joint portions 23 projecting outward from both end portions of the annular portion 22 and for joining the pair of divided members Ba with a fastening bolt 16a and a fastening nut 16b. . Since the configuration of the main body portion B1 is the same as that of the first embodiment, detailed description thereof will be omitted.

The connection portion B3 connects the annular portions 22 of the pair of main body portions B1 to each other, and has a bent portion 43 that bends outward from the annular portion 22 and an outer surface that extends from the bent portion 43 along the tube axis direction X. , and an integrated portion 44 in which the pair of bent portions 43 are integrated. A plurality of (two in this embodiment) engaging recesses 44a that engage with the projecting portion 12Ab1 of the valve box 12 are formed on the inner surface of the integral portion 44 . The engaging concave portion 44a may be formed with a facing inclined surface facing the inclined surface 12Ab2 of the projecting portion 12Ab1. When the pair of split members Ba are moved from the radially outer side toward the radially inner side and attached to the valve body 12, the protrusions 12Ab1 and the engagement recessed portions 44a are engaged with each other, so that the valve body 12 of the split members Ba is moved. The mounting position for the is guided.

Since the sealing band 13 in this embodiment is an integral type configured by a pair of body portions B1 and a connection portion B3 that connects the pair of body portions B1, it has high strength. Moreover, since the sealing band 13 is composed of a plurality of divided members Ba divided in the circumferential direction of the water pipe W, it is possible to attach the plurality of divided members Ba from the radial direction of the water pipe W. There is no need to move the band 13 along the tube axis direction X. As a result, the inner peripheral surface of the sealing band 13 is not damaged by burrs or the like formed on the outer peripheral surface of the water pipe W, and the durability of the sealing band 13 can be enhanced.

The installation method of the gate valve 1 in this embodiment is the same as in the first embodiment. That is, a housing mounting step of sealingly mounting the housing 3 containing the sealing band 13 to the water pipe W in a sealed state, and cutting the water pipe W by the cutting device 2 inside the housing 3 to insert and remove the valve body 15 in the direction Y A fluid pipe cutting step of forming a pair of arc-shaped cut surfaces 20 that approach toward the intermediate position of the water pipe W, and a valve body 15 is accommodated between the pair of arc-shaped cut surfaces 20 inside the housing 3 and a valve box installation step of inserting the valve box 12, and a pusher member P (an example of an operation unit) provided outside the housing 3 is operated to move the divided member Ba in the radial direction of the water pipe W, and the water supply It comprises a sealing band attaching step of sealingly covering the space between the pipe W and the valve box 12 with the sealing band 13, and a housing removing step of removing the housing 3 from the water pipe W (see FIGS. 10 to 13).

In the present embodiment, the sealing band 13 is housed in the housing 3 in advance, and the pusher member P provided outside the housing 3 is operated to move the dividing member Ba so that the water pipe W and the valve box 12 are separated. By attaching the sealing band 13 between them and removing the housing 3 from the water pipe W, the attachment of the sluice valve 1 is completed. Thus, since the gate valve 1 is composed of the valve box 12 containing the valve body 15 and the sealing band 13 that seals between the water pipe W and the valve box 12, the housing 3 is left. Therefore, the size of the gate valve 1 can be reduced. Moreover, since a plurality of projections 12Ab1 that engage with the projections 12Ab1 of the valve body 12 are formed on the inner surface of the integral part 44, the mounting position of the sealing band 13 to the valve body 12 is accurate.

[Other embodiments]
(1) As shown in FIG. 26, the ends of a pair of split members Ba (semi-cylindrical members) of the annular split body B may be joined by hinges 42 . In this case, the valve body 12 is inserted between the pair of water pipes W1 and W2 in a state in which the pair of split members Ba are attached to the projecting pipe portion 12B of the valve body 12 in advance, and then the pusher member P or the split member Ba is inserted. The pair of split members Ba may be closed by their own weight.
(2) In place of the sealing band 13, a stretchable member that can be stretched in the direction X of the pipe axis may be used, and the stretchable member may be held by a known detachment prevention tool.
(3) The split surfaces of the pair of split members Ba are not limited to the vertical direction as in the above-described embodiment, but may be the horizontal direction, the oblique direction, or the like. When the split surfaces of the pair of divided members Ba are set in the left-right direction, the valve box 12 having the upper divided member Ba attached to the projecting pipe portion 12B in advance is inserted between the pair of water pipes W1 and W2, and then the lower portion A jack mechanism provided on the bottom wall 3Ab of the case 3A may be used to push up the lower split member Ba for attachment.
(4) The gate valve 1 may be arranged such that the insertion/removal direction Y of the valve body 15 is not the vertical direction but the oblique direction or the horizontal direction.
(5) The fluid pipe is not limited to a water pipe, and is not particularly limited as long as it is a pipe such as a gas pipe that circulates a fluid.

INDUSTRIAL APPLICABILITY The present invention can be used for a gate valve having a valve body capable of closing a flow path by being inserted between a pair of fluid pipes, and a method for installing the gate valve.

Reference Signs List 1: gate valve 2: disconnecting device 3: housing 12: valve box 12A: valve box side accommodating portion (valve box main body)
12Ab: side surface 12Ab1: projecting portion (engaged portion)
12Ab2: Inclined surface 12Ac: Bottom concave portion 12B: Protruding pipe portion 12Ba: Circular end surface 13: Sealing band 14: Movement prevention mechanism 15: Valve body 20: Circular cut surface 25: Engagement portion 25a1: Opposite inclined surface 33: Holding Part 39: Annular claw portion (claw portion)
40 : Annular convex portion 41 : Annular concave portion 42 : Hinge B : Annular divided body B1 : Main body portion B2 : Extension portion Ba : Divided member P : Pusher member (operation portion)
S: Seal member Sa1: First annular projection Sa2: First annular projection Sa3: Second annular projection W: Water pipe (fluid pipe)
X: Tube axial direction Y: Insertion/extraction direction

Claims (13)

a valve body that can block the flow path by being inserted between the pair of fluid tubes;
a valve box disposed between the pair of fluid pipes and housing the valve body;
a sealing band that seals between the pair of fluid pipes and the valve body;
A pair of sealing bands divided along a plane perpendicular to the tube axial direction of the fluid tubes so as to individually cover the pair of fluid tubes and both end portions of the valve body facing the end faces of the respective fluid tubes. It is composed of an annular divided body of
Each of the annular split bodies has a main body portion that seals the fluid pipe and the valve body, and is composed of a plurality of split members divided in the circumferential direction of the fluid pipe ,
The valve box is formed with a protruding portion that protrudes outward from a side surface along the pipe axis direction,
A gate valve in which the annular divided body has an extending portion extending from the main body portion so as to face the side surface, and a tip portion of the extending portion and the projecting portion are engaged with each other . The projecting portion is formed with an inclined surface whose width in the tube axis direction increases toward the side surface,
2. The gate valve according to claim 1 , wherein the distal end portion is formed with a facing inclined surface facing the inclined surface. The valve body has a pair of protruding pipe portions that protrude in the pipe axial direction from the valve body,
A seal member extending over the fluid pipe and the projecting pipe portion is attached to the inner surface of the main body portion,
3. The seal member according to claim 1 or 2 , wherein a first annular protrusion that abuts on the outer peripheral surface of the fluid pipe and a second annular protrusion that abuts on the outer peripheral surface of the projecting pipe are formed to protrude from the seal member. gate valve. the pair of end faces are a pair of arc-shaped cut faces that become closer toward an intermediate position of the fluid pipe in the insertion/removal direction of the valve body,
4. The gate valve according to claim 3 , wherein the projecting pipe portion is formed with arcuate end surfaces facing each other along the arcuate cut surface. The gate valve according to any one of claims 1 to 4 , wherein a bottom surface recess for positioning is formed in the bottom surface of the valve box. The gate valve according to any one of claims 1 to 5 , wherein each of said divided members is composed of a pair of semi-cylindrical members joined together. 7. The gate valve according to claim 6 , wherein the split surfaces of the pair of semi-cylindrical members are formed with recesses and protrusions that fit together. 8. A gate valve according to claim 6 or 7 , wherein the ends of said pair of semi-cylindrical members are hinged. 9. The partition according to any one of claims 1 to 8 , further comprising a movement prevention mechanism provided on the opposite side of the main body from the valve box and preventing movement of the annular split body in the pipe axis direction. valve. The gate valve according to any one of claims 1 to 8 , wherein the inner peripheral surface of the annular divided body is formed with a claw portion that bites into the fluid pipe. An annular concave portion is formed on the outer peripheral surface of the fluid pipe,
The gate valve according to any one of claims 1 to 8 , wherein an annular projection that fits into the annular recess is formed on the inner peripheral surface of the annular divided body. Consists of a valve body that can block a flow path by being inserted between a pair of fluid pipes, a valve box that houses the valve body, and a pair of annular divisions that are divided in the axial direction of the fluid pipe. and a sealing band formed of a plurality of split members divided in the circumferential direction of the fluid pipe, wherein the annular split body is installed in the fluid pipe, the method comprising:
a housing mounting step of sealingly mounting the housing containing the sealing band on the fluid pipe;
a fluid pipe cutting step of cutting the fluid pipe with a cutting device inside the housing to form a pair of arc-shaped cut surfaces that become closer toward an intermediate position of the fluid pipe in the insertion/removal direction of the valve body;
a valve box installation step of inserting the valve box housing the valve body between the pair of arc-shaped cut surfaces inside the housing;
By operating an operation part provided on the outside of the housing, the split member is moved in the radial direction of the fluid pipe, and a sealing band is installed to cover the space between the fluid pipe and the valve body in a sealed state with the sealing band. process and
and a housing removal step of removing the housing from the fluid pipe. 13. The method of installing a sluice valve according to claim 12 , wherein in the step of attaching the sealing band, the split member is slid while being guided by a holding portion that is provided at the bottom of the housing and holds the split member.

Images