JP6141142B2 - Gate valve - Google Patents

Description

  The present invention relates to a gate valve that includes a valve body portion that opens and closes a conduit portion connected to a fluid pipe and is used in an uninterrupted state.

  A conventional gate valve is temporarily disposed with a bypass pipe before and after the section, for example, when pipe work is performed such as laying a section of a fluid pipe network buried in the ground. Used to switch the flow path to the bypass pipe by opening and closing the part. Since this gate valve is equipped with a work valve that shuts off the open / close path of the valve body so that the valve body can be attached and detached before and after construction, the valve stem of the valve body protrudes radially from the pipe. ing. Therefore, in particular, when the buried depth of the fluid pipe is shallow and the earth covering is small, there is a problem that the workability of the pipe work is affected, for example, the valve shaft portion may be exposed from the road surface.

  In order to solve this problem, the housing part that accommodates the valve body part is composed of an outer cylinder part provided with a work valve and an inner cylinder part fitted to the outer cylinder part. There is a gate valve that adopts a structure in which the cylinder part can be expanded and contracted, and that can be downsized by shortening the inner cylinder part during construction (for example, see Patent Document 1).

Japanese Utility Model Publication No. 63-47337 (page 4, FIG. 3)

  However, in the gate valve of Patent Document 1, for example, when the inner cylinder part is extended with respect to the outer cylinder part in order to remove the valve body part after pipe work, the inner cylinder part receives the pressure of the internal fluid. There is a problem in that there is a risk that the internal fluid leaks by being detached from the outer cylinder portion.

  The present invention has been made paying attention to such a problem, and is a gate valve that can be limited to an extension allowance of a predetermined width while maintaining a sealed state without detaching the movable part from the main body part of the housing part. The purpose is to provide.

In order to solve the above problems, the gate valve of the present invention is:
A conduit portion connected to the fluid pipe, a casing portion communicating with the conduit portion, a valve body portion provided in the casing portion so that the conduit portion can be opened and closed, and opening of the valve body portion It is composed of a work valve part capable of blocking communication between the pipe line part and the casing part in a state,
The casing has a continuous flow having a main body provided with the work valve portion, and a movable portion provided with the valve body portion and attached to the main body portion so as to be extendable and detachable in a sealed state. A gate valve used in a state,
It is characterized by comprising limiting means for limiting the extension allowance with a predetermined width capable of maintaining the sealed state of the movable part.
According to this feature, the movable part of the housing part is restricted from extending with respect to the main body part by the restricting means, so that the sealed part is maintained without being detached from the main body part after use of the gate valve. Therefore, the movable part can be removed by blocking the work valve without leakage of the internal fluid.

The gate valve of the present invention is
The restricting means includes a restricting portion that restricts extension of the movable portion beyond an extension allowance of the predetermined width.
According to this feature, since the movable portion is restricted to an extension allowance of a predetermined width by the restricting portion provided in the restricting means, there is no possibility of deviating from the sealed state with the main body portion.

The gate valve of the present invention is
The restricting means restricts to a shortened margin of a predetermined width capable of maintaining a separated state between the valve body portion and the work valve portion.
According to this feature, when the movable portion is shortened, the valve body portion that moves with the movable portion does not come into contact with the work valve portion and is not damaged.

The gate valve of the present invention is
The movable part is characterized in that a storage space for the valve body of the valve body part is formed on the opposite side of the pipe line part from the connection part with the main body part.
According to this feature, since the connecting portion of the main body portion can be disposed as close as possible to the pipe line portion, the movable portion and the valve body portion can be removed to minimize the main body portion remaining in the pipe line portion.

The gate valve of the present invention is
The movable portion expands and contracts between an extended position where the work valve portion can be shut off when the valve body portion is open and a shortened position where the valve body tip of the valve body portion exceeds the open work valve portion. It is characterized by being able to be attached.
According to this feature, by shortening the movable part to the position where the tip of the valve body part exceeds the working valve part, the valve body part can not only shorten the opening / closing stroke for opening and closing the conduit part, but also the movable part after use. The movable valve portion can be removed by blocking the work valve portion in a state where is placed in the extended position.

The gate valve of the present invention is
The work valve portion is provided so as to be openable and closable in an extending direction of the pipe line portion.
According to this feature, since the work valve portion opens and closes in the extending direction of the pipeline portion, it can be avoided that the work valve portion protrudes from the pipeline portion.

(A), (b) is a piping diagram which shows the renewal construction of a fluid pipe | tube using the gate valve in Example 1. FIG. It is a front sectional view showing a straight pipe type gate valve. It is front sectional drawing which shows a T-shaped type gate valve. (A)-(c) is front sectional drawing which shows the flow which attaches a movable part and a main-body part. (A)-(c) is front sectional drawing which shows the flow which removes a movable part and a main-body part. It is a perspective view which shows a control bolt. It is front sectional drawing which shows the modification of a straight pipe type gate valve. (A) is front sectional drawing which shows the shortened state of the straight pipe type gate valve in Example 2, (b) is front sectional drawing which similarly shows an expansion | extension state. (A) is front sectional drawing which shows the shortened state of the straight pipe type gate valve in Example 3, (b) is front sectional drawing which similarly shows an expansion | extension state.

  EMBODIMENT OF THE INVENTION The form for implementing the gate valve which concerns on this invention is demonstrated below based on an Example.

  The gate valve according to the first embodiment will be described with reference to FIGS. 1 to 6. First, reference numerals 10 and 20 in FIG. 1 are gate valves to which the present invention is applied. As shown in FIGS. 1A and 1B, the gate valves 10 and 20 of the present invention are attached together with the update of the update section S when, for example, the predetermined update section S of the fluid pipe 1 is updated. In order to update the next update section T, the pipeline is switched in an uninterrupted state.

  More specifically, first, as shown in FIG. 1, the split T-shaped pipes 3 and 3 with on-off valves are connected to the upstream and downstream sides of the renewal section S, and the on-off valves 4 and 4 are connected. After drilling the fluid pipe in an uninterrupted flow state using a drilling machine that does not, the split T-shaped pipes 3 and 3 with on-off valves are connected by a bypass pipe 5. Further, a valve body capable of similarly perforating a fluid pipe in a continuous flow state at a location adjacent to the renewal section S side of the split T-shaped pipes 3 and 3 with the on / off valves and opening and closing the fluid pipe via the perforations. The sealing plugs 2 and 2 provided with are provided.

  Then, both the on-off valves 4 and 4 are opened and both the sealing plugs 2 and 2 are closed, whereby the pipe fluid is bypassed by the bypass pipe 5. In this state, renewal work such as excising the existing pipe in the renewal section S and attaching a new pipe can be performed. After the construction, both the sealing plugs 2 and 2 are opened and both the on-off valves 4 and 4 are closed, whereby the flow path of the in-pipe fluid is returned to the new pipe, and the bypass pipe 5 is removed.

  Further, as shown in FIG. 1B, along with the installation of the new pipe, the T-shaped gate valve 20, straight pipe gate valve 10 and bypass pipe 6 which will be described later are disposed in advance in the updated section S1. Preparation for renewal work of the next renewal section T adjacent to the renewed section S1 is made.

  Next, after attaching the split T-tube 3 with the on-off valve and the sealing plug 2 similar to the above on the right side of the update section T in the drawing, the update section T is renewed. Hereinafter, although not particularly illustrated, the next update section is sequentially constructed.

  In this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, industrial water, agricultural water, sewage, etc., gas, gas and liquid The gas-liquid mixture may be used.

  The structure of the gate valve of the present invention will be described. As shown in FIG. 2, the straight pipe type gate valve 10 includes a straight pipe portion 11 as a pipe portion connected to a fluid pipe constituting a pipe network, and a hole portion 11 a formed in the straight pipe portion 11. A casing portion 12 that communicates with the inside through a valve body, a valve body portion 15 that is provided in the casing portion 12 and is pivotally supported so that the inner surface of the straight pipe portion 11 can be opened and closed, and the valve body portion 15 is opened. And the working valve part 16 which can block | disconnect the communication of the straight pipe part 11 and the housing | casing part 12 mainly.

  More specifically, the casing 12 of the straight pipe type gate valve 10 includes a main body 14 integrally formed with the straight pipe 11 and extending in a cylindrical shape, and a guide formed on the inner peripheral surface of the main body 14. It has a movable part 13 fitted in a sealed state via a packing 18 provided around the part 14b.

  That is, the movable portion 13 is fitted in the main body portion 14 in a nested manner, and can be extended or shortened in the radial direction of the straight tube portion 11 with respect to the main body portion 14. As shown in FIG. 2, the movable portion 13 and the main body portion 14 are connected by bolts and nuts 17 inserted through the bolt holes of the flanges 13 a and 14 a as connecting portions, and the movable portion 13 is connected to the main body. At the shortened position shortened with respect to the portion 14, the flanges 13a, 14a abut against each other to prevent over-insertion. The movable portion 13 has a flange 13 a at a substantially central height position between the upper peripheral wall 13 c and the lower peripheral wall 13 b, and the lower peripheral wall 13 b slides on the packing 18.

  Further, the main body 14 is provided with a work valve body 16a constituting the work valve section 16 and an operation shaft 16b capable of operating the work valve body 16a from the outside in a recess communicating with the hole 11a. . The working valve body 16a operates in the extending direction of the straight pipe portion 11 by gripping and manipulating the end portion of the operation shaft 16b protruding outward from the open position where the hole portion 11a is opened and the blocking position where the hole portion 11a is blocked. It is provided to be slidable.

  Thus, since the work valve body 16a of the work valve portion 16 opens and closes in the extending direction of the straight pipe portion 11, it is possible to avoid the work valve portion 16 from protruding from the straight pipe portion 11.

  Further, the valve body portion 15 penetrates the upper end of the movable portion 13 in a sealing manner, and is screwed into a valve shaft 15a pivotally supported so as to be rotatable in the circumferential direction and immovable in the axial direction, and a male screw of the valve shaft 15a. And a valve body 15c having an outer surface covered with an elastic material. In other words, the valve body 15 grips and rotates the operation end 15d of the valve shaft 15a protruding outward from the movable portion 13, so that the valve body 15c moves in the axial direction as the female screw top 15b is inserted. Then, the open position of the straight pipe portion 11 shown in FIG. 4C and the closed position where the outer surface of the valve body 15c abuts the inner surface of the straight pipe portion 11 in a sealing manner in the circumferential direction (illustrated by a two-dot chain line). It can be moved back and forth between.

  As shown in FIG. 3, a T-shaped gate valve 20 includes a branch pipe portion 21b as a pipe portion connected to a bypass pipe that is a fluid pipe, and a T-shape substantially orthogonal to the branch pipe portion 21b. The main body 21c has a main pipe portion 21c that communicates with the inside of the pipe, and a housing portion 12 that communicates with the inside through a hole 21a formed in the branch pipe portion 21b. Since the other structure of the T-shaped pipe gate valve 20 is the same as that of the straight pipe type gate valve 10 described above, the same reference numerals as those of the straight pipe type gate valve 10 are used and description thereof is omitted.

  Next, as shown in FIGS. 4A to 4C, the assembly process of the movable portion 13 and the valve body portion 15 of the straight pipe type gate valve 10 will be described in the order of steps.

  First, as shown in FIG. 4A, the straight pipe type gate valve 10 before the assembly of the movable portion 13 and the valve body portion 15 has the closing lid 8 disposed on the flange 14 a of the main body portion 14. The portion 14 and the closing lid 8 are fastened by bolts and nuts 9. Below the closing lid 8, the work valve body 16 a blocks the hole portion 11 a, and the sealing performance of the straight pipe portion 11 is maintained. Note that a sheet surface extends downward on the lower surface of the closing lid 8, and the sheet surface is in close contact with the packing 18 so that a sealed state is maintained.

  Next, as shown in FIG. 4B, the closing lid 8 is removed, and instead of this, the movable portion 13 having the valve body portion 15 is assembled to the main body portion 14, and the bolt holes of both flanges 13a and 14a are assembled. A bolt / nut 17 or a restriction bolt 30 as a limiting means of the present invention is attached.

  As shown in FIG. 6, the regulating bolt 30 is composed of a pair of opposing pieces 32a and 32b having opposing surfaces spaced apart from each other by a predetermined distance, and an erection piece 32c erected on the opposing pieces 32a and 32b. The formed restricting portion 32 and the bolt 31 inserted through the insertion hole of the one opposing piece 32a and screwed into the screw insertion hole of the other opposing piece 32b. Further, the restriction bolt 30 includes a spacer 33 made of a rigid body having a predetermined height that is inserted through the opening 32d at the substantially center of the installation piece 32c. Note that the restriction bolt of the present embodiment does not necessarily include the opening 32d of the installation piece 32c and the spacer 33.

  As shown in FIG. 4B, the regulating bolt 30 is attached to both the flanges 13a and 14a in a state where the pair of opposed pieces 32a and 32b can contact the upper surface of the flange 13a and the lower surface of the flange 14a, respectively. The regulating bolt 30 can be inserted between the opposing surfaces of the flanges 13a and 14a from the opening 32d of the installation piece 32c while being attached to the flanges 13a and 14a.

  Although the movable part 13 is extended with respect to the main-body part 14, since the lower end of the lower surrounding wall 13b of the movable part 13 is closely_contact | adhered to the packing 18, the sealing state is maintained. Further, since the spacer 33 of the regulating bolt 30 is engaged between the opposing surfaces of the flanges 13a and 14a, the lower end of the valve body 15c of the valve body portion 15 does not contact the work valve body 16a in the shut-off state. It is spaced apart upward.

  Thus, when the movable portion 13 is shortened by restricting the spacer 33 to a shortened margin of a predetermined width that can maintain the separated state of the valve body 15c and the work valve body 16a, the spacer 33 moves along with the movable portion 13. The valve body 15c to be touched does not come into contact with the work valve body 16a to be damaged.

  Next, the covering nut 16c covering the end of the operation shaft 16b protruding outward from the work valve portion 16 is removed, and the operation valve body 16a is opened by operating the operation shaft 16b. With this opening, fluid flows into the housing 12, but the bolt / nut 17 loosely fitted to the movable portion 13 and the main body 14 and the restriction portion 32 of the restriction bolt 30 resist the fluid pressure, and the movable portion 13. Since the movement of is restricted, the sealed state is maintained. After the work valve body 16a is opened, the bolts and nuts 17 are attached instead of the restriction bolts 30.

  As shown in FIG. 4C, the movable part 13 is gradually shortened with respect to the main body part 14 by gradually screwing the bolts and nuts 17. The bolts and nuts 17 are tightened to bring the flanges 13a and 14a into surface contact. In this state, the position of the movable portion 13 is such that the lower end of the valve body 15c in the open position is located below the open work valve body 16a and is located above the top of the straight pipe portion 11. It is a shortened position. Next, by rotating the operation end 15d of the valve shaft 15a, the valve body 15c can be moved up and down, and the straight pipe portion 11 can be opened or closed. In addition, it replaces with the state which both flanges 13a and 14a of a present Example surface-contact, and the lower end surface of the lower peripheral wall 13b of the movable part 13 contact | abutted to the step part 14c of the guide part 14b lower end of the main-body part 14, You may comprise so that the position of the movable part 13 may become a shortened position.

  Thus, by shortening the movable part 13 to a position where the tip of the valve body 15c exceeds the working valve body 16a, not only can the opening / closing stroke for the valve body part 15 to open and close the straight pipe part 11 be shortened, but also after use. With the movable part 13 arranged at the extended position, the work valve body 16a is shut off and the movable part 13 can be removed.

  Next, as shown in FIGS. 5A to 5C, the removal process of the movable portion 13 and the valve body portion 15 of the straight pipe type gate valve 10 will be described in the order of steps.

  First, as shown in FIGS. 5 (a) and 5 (b), some of the bolts / nuts 17 out of a plurality of sets of bolts / nuts 17 tightening the flanges 13a, 14a with the valve body 15c in the open position. The nut 17 is removed, and in place of this, the restriction bolt 30 is fastened to both flanges 13a and 14a.

  Next, as shown in FIG. 5C, the remaining bolts and nuts 17 are gradually loosened, and the movable portion 13 is extended with respect to the main body portion 14. At this time, the movable portion 13 may be extended by using the fluid pressure acting in the housing portion 12.

  In this embodiment, there are four sets of bolts and nuts for tightening both flanges 13a and 14a. Of these, two sets are removed and replaced with restriction bolts 30, and the remaining two sets of bolts and nuts 17 are gradually added. The number of bolts and nuts that tighten both flanges, the number of groups that replace the restriction bolts, and the number of remaining bolts and nuts is not limited to this embodiment. For example, tighten both flanges. Of the four sets of bolts and nuts, only one set may be replaced with a restriction bolt, leaving three sets of bolts and nuts, or there are six bolts and nuts that tighten both flanges, two of which are restricted bolts You may leave 4 pairs of bolts and nuts.

  As shown in FIG. 5C, the movable portion 13 is extended with respect to the main body portion 14 until the lower end of the opened valve body 15c is positioned above the work valve body 16a. Since the opposing width of the opposing pieces 32a and 32b of the restricting portion 32 is substantially the same as the separation width between the upper surface of the flange 13a and the lower surface of the flange 14a at the extended position of the movable portion 13, the operator is separated from each other. The position where the upper surface of the flange 13a and the lower surface of the flange 14a abut against the opposing pieces 32a and 32b of the restricting portion 32 can be determined as the extended position of the movable portion 13, respectively.

  Further, since the restricting portion 32 is integrally formed in a substantially U-shape consisting of a pair of opposing pieces 32a and 32b and a erected piece 32c laid on these, for example, when the movable portion 13 is extended, the internal fluid Even if an unexpected external force is applied to the movable part 13 in the direction away from the main body due to pressure or the like, the restricting part 32 engages with the flange to restrict the movement, thereby preventing the movable part 13 from being detached and the main body 14. There is no risk of deviating from the sealed state.

  Furthermore, by inserting the spacer 33 between the opposed surfaces of the flanges 13a and 14a through the opening 32d of the installation piece 32c, the position of the extended movable portion 13 can be stabilized and the possibility of unexpected drop can be prevented. Since the tip of the spacer 33 is tapered, it can be easily inserted between the opposing surfaces of the flanges 13a and 14a.

  As shown in FIG. 5C, the work valve body 16a is shut off at the extended position of the movable portion 13, and the movable portion 13 and the valve body portion 15 are removed. And the obstruction | occlusion lid | cover 8 shown to Fig.4 (a) is attached to the flange 14a of the main-body part 14. FIG. The movable part 13 has an upper peripheral wall 13c extending in a bell shape on the opposite side of the straight pipe part 11 from the flange 13a which is a connection part with the main body part 14, so that a storage space for the valve body 15c is provided inside. Is formed. By doing in this way, since the flange 14a of the main-body part 14 can be arrange | positioned near the straight pipe part 11 as much as possible, after removing the movable part 13 and the valve body part 15, the main-body part 14 remaining in the straight pipe part 11 is minimized. Can be

  According to the restriction bolt 30 as the restricting means of the present invention described above, the movable portion 13 of the housing portion 12 is restricted from extending with respect to the main body portion 14 so that the movable portion 13 is movable after the straight pipe type gate valve 10 is used. The part 13 can be extended without being detached from the main body part 14 while maintaining the sealed state, and the movable part 13 can be removed by blocking the work valve body 16a without leakage of the internal fluid.

  Next, as shown in FIG. 7, a modified example of the gate valve of the present invention will be described. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. In the case portion 12 'of the present modification, the inner peripheral surface 14d of the main body portion 14' has a step shape and is linearly formed in the vertical direction, and the movable portion 13 is formed along the inner peripheral surface 14d. It is designed to expand and contract. By doing in this way, not only can the structure of the gate valve 10 'be simplified, but also the possibility that impurities will stay in the stepped portion can be avoided.

  Further, as another modification of the gate valve of the present invention, although not particularly illustrated, for example, a packing for sealing the movable portion and the main body portion may be provided on the outer peripheral surface of the movable portion, or still another As a modification, the flange of the main body part to which the movable part is attached and detached may be provided in the vicinity of the proximal end of the opened valve body part that is separated from the pipe line part.

  Next, a gate valve according to the second embodiment will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals and redundant description is omitted.

  As shown in FIG. 8A, the housing part 42 of the straight pipe type gate valve 40 of the second embodiment includes a movable part 43 made of members screwed together and an outer peripheral surface of the straight pipe part 11. And a main body portion 44 having a flange 44a connected to the movable portion 43 at a position in the vicinity thereof. Further, the movable portion 43 includes a fitting portion 45 connected to the flange 44a of the main body portion 44 by a bolt 47 via a packing (not shown), and a female screw portion 46a screwed to the male screw portion 45a of the fitting portion 45. And a fitting portion 46.

  More specifically, the fitting portion 46 is pivotally supported on the upper portion of the valve shaft 15a and has an inner fitting having an inner peripheral wall along the inner peripheral surface on the back side of the male screw portion 45a of the fitted portion 45. It is comprised from the part 46c and the external fitting part 46b which was fixed to this internal fitting part 46c with the attachment screw 46d, and was provided with the internal thread part 46a between the internal peripheral walls of the internal fitting part 46c.

  That is, the movable portion 43 has a fitting portion 46 fitted from the inside to the outside to the fitted portion 45 provided with the male screw portion 45a, and by screwing the female screw portion 46a accompanying the rotation operation of the fitting portion 46, The main body 44 is configured to be extendable and contractible. Further, a packing 46e that is in close contact with the inner surface of the fitted portion 45 is provided on the outer peripheral wall outer surface of the inner fitting portion 46c, and the sealed state is maintained even when the movable portion 43 expands and contracts.

  As shown in FIG. 8B, the movable portion 43 can be easily expanded and contracted with respect to the main body portion 44 by rotating the fitting portion 46 of the movable portion 43. Further, since the male screw portion 45a and the female screw portion 46a are screwed together, movement in the expansion / contraction direction is restricted, and even if an external force is applied to the movable portion 43, the external force can be counteracted. There is no risk of being detached from the main body 44. That is, the male screw portion 45a and the female screw portion 46a of the second embodiment constitute a restricting portion of the limiting means of the present invention.

  Further, for example, by attaching a mark (not shown) to a predetermined height position on the outer surface of the fitted portion 45, the operator can visually confirm that the predetermined extended position or shortened position has been reached.

  Next, a gate valve according to Embodiment 3 will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals and redundant description is omitted.

  As shown in FIG. 9A, the restricting means 50 of the third embodiment is fixed to the main body portion 14 of the straight pipe type gate valve 10 and is erected so as to surround the movable portion 13. And an operation screw 52 screwed into the female screw portion 51a on the upper wall of the standing portion 51, and the operation screw 52 is rotatably supported and axially immovable and is fixed to the valve body portion 15. And a fixed portion 53.

  In detail, the restricting means 50 is assembled by inserting a plurality of fixing screws 51b provided at the lower end of the standing portion 51 inwardly and contacting or screwing with the peripheral surface portion of the flange 14a of the main body portion 14. The installation part 51 is fixed to the main body part 14. Further, a fixing screw 53 b provided on the fixing portion 53 is screwed inward and brought into contact with the operation end portion 15 d of the valve body portion 15, thereby fixing the fixing portion 53 to the valve body portion 15. Further, after the restricting means 50 is assembled, the bolts and nuts for tightening the flanges 13a and 14a are loosely fitted or removed.

  Next, as shown in FIG. 9B, when the operation screw 52 is screwed upward, the operation screw 52 is fixed to the fixed portion 53 that receives the operation screw 52, the valve body portion 15 fixed to the operation screw 52, and the movable portion 13. With this, it moves gradually upward with respect to the standing portion 51 fixed to the main body portion 14.

  By rotating the operation screw 52 in this way, the movable portion 13 can be easily expanded and contracted with respect to the main body portion 14 in a stepless manner. In addition, since the operating screw 52 and the female screw portion 51a of the standing portion 51 are screwed together, even if an external force is applied to the movable portion 13 in the upward direction, the external force can be counteracted. There is no risk of slipping off. That is, the operation screw 52 and the female screw portion 51a of the third embodiment constitute a restricting portion of the limiting means of the present invention.

  Further, for example, by attaching a mark (not shown) to a predetermined height position on the outer surface of the operation screw 52, the operator can visually confirm that the extended position shown in the figure has been reached.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the first embodiment, the restriction bolt 30 as the restricting means of the present invention includes the spacer 33 that restricts the shortening of the movable portion 13 to a predetermined width. The width in the front-rear direction of the shaped restricting portion may be formed to the above-described predetermined width, and the shortening of the movable portion 13 is restricted to the predetermined width by disposing the restricting portion between the opposing surfaces of both the flanges 13a and 14a. You may make it do.

  Further, for example, in the first embodiment, the restriction bolt 30 as the restriction means of the present invention includes the restriction portion 32 that restricts the expansion exceeding the extension allowance of the predetermined width, but the restriction means of the present invention is not necessarily limited to the above. It is not limited to the one provided with the restricting portion, and for example, it may have a mark that allows the operator to visually confirm that the extension width of a predetermined width that can maintain the sealed state has been reached.

DESCRIPTION OF SYMBOLS 1 Fluid pipe line 2 Seal plug 3 Split T character pipe with on-off valve 4 On-off valve 5, 6 Bypass pipe 8 Closure lid 10 Straight pipe type gate valve (gate valve)
11 Straight pipe section (pipe section)
12 Housing | casing part 13 Movable part 14 Main-body part 13a, 14a Flange (connection part)
15 Valve body part 15c Valve body 16 Work valve part 16a Work valve body 17 Bolt / nut 18 Packing 20 T-shaped gate valve (gate valve)
30 Regulatory bolt (limitation means)
31 Bolt 32 Restriction part 33 Spacer 40 Straight pipe type gate valve (gate valve)
42 Housing | casing part 43 Movable part 44 Main-body part 45 Fit part 45a Male thread part (regulation part)
46 Fitting part 46a Female thread part (regulation part)
50 Limiting means 51 Standing portion 51a Female thread portion (regulating portion)
52 Operation screw (Regulator)
53 Fixed part

Claims (6)

A conduit portion connected to the fluid pipe, a casing portion communicating with the conduit portion, a valve body portion provided in the casing portion so that the conduit portion can be opened and closed, and opening of the valve body portion It is composed of a work valve part capable of blocking communication between the pipe line part and the casing part in a state,
The casing has a continuous flow having a main body provided with the work valve portion, and a movable portion provided with the valve body portion and attached to the main body portion so as to be extendable and detachable in a sealed state. A gate valve used in a state,
A gate valve comprising limiting means for limiting an extension allowance of a predetermined width capable of maintaining the sealed state of the movable part.   2. The gate valve according to claim 1, wherein the restricting unit includes a restricting portion that restricts extension of the movable portion beyond an extension allowance of the predetermined width.   3. The gate valve according to claim 1, wherein the restricting unit restricts a shortening allowance of a predetermined width capable of maintaining a separated state between the valve body portion and the work valve portion.   4. The storage space for the valve body of the valve body portion is formed in the movable portion on the opposite side of the conduit portion from the connection portion with the main body portion. 5. The gate valve according to crab.   The movable portion expands and contracts between an extended position where the work valve portion can be shut off when the valve body portion is open and a shortened position where the valve body tip of the valve body portion exceeds the open work valve portion. The gate valve according to any one of claims 1 to 4, wherein the gate valve can be attached.   The gate valve according to any one of claims 1 to 5, wherein the work valve portion is provided so as to be openable and closable in an extending direction of the pipe line portion.

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