JP2018076928A - Gate valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide means for correcting deflection and distortion in a thickness direction, of a valve element 2 of a valve casing 1 with simple operation.SOLUTION: A gate valve V is composed of a valve casing 1 having an opening portion 5 and a metallic valve casing valve seat 14, a valve element 2 having a metallic valve element valve seat 13, and a bonnet (cover) 6 of a valve casing upper portion, and opens and closes a fluid passage 4 by moving the valve element up and down by a valve rod 3. A patch 21 is fixed to the bonnet 6 opposed to the valve casing opening portion 5, and an adjustment bolt 22 is screwed into the other end portion of the patch so that its tip is brought into contact with a surface of the valve casing opening portion 5. A fixed bolt 23 fixed to the valve casing opening portion is axially movably penetrated through the patch in adjacent to the adjustment bolt 22, and a fixing nut 24 is screwed to a projecting end from the patch of the fixed bolt. The opening portion is made to approach and separate from the patch by the adjustment bolt, the fixed bolt and the fixing nut to warp the opening portion 5 in a projecting or recessed manner so that a clearance width t in a valve element thickness direction, of the valve casing valve seat 14 is expanded and narrowed to properly correct deflection and distortion in the valve element thickness direction, of the valve casing valve seat 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gate valve that moves a valve body linearly in a direction perpendicular to a fluid passage in a valve box, and opens / closes (opens / closes) the fluid passage by the valve box valve seat and the valve body valve seat.

  As a gate valve used in a fluid passage through which a fluid such as gas or liquid flows, a description will be given with reference to FIGS. 1 and 2 showing an embodiment of the present invention. Valve body 1 having a cylindrical opening 5 and a valve box valve seat 14, and a valve body valve attached to a valve stem (valve shaft) 3 inserted from the opening 5 in a direction perpendicular to the fluid passage 4. Some include a valve body 2 having a seat 13 for opening and closing the fluid passage 4 and a lid (bonnet) 6 in which the opening 5 of the valve box 1 is closed and the valve rod 3 is inserted. The valve body valve seat 13 has a wedge shape in which the width in the thickness direction of the valve body 2 gradually decreases in the insertion direction (arrow c in the figure), and the valve box valve seat 14 has a wedge shape in the fully closed position of the valve body 2. The valve body 2 is moved in the direction perpendicular to the fluid passage 4 by the valve rod 3 so that the valve body valve seat 13 and the fluid passage 4 are in contact with each other. The fluid passage 4 is blocked by the contact of the valve box valve seat 14.

  This gate valve V is often used when a valve seat made of an elastic material such as rubber cannot be used due to the temperature or properties of the fluid passing through the fluid passage 4, and the valve body valve seat 13 and the valve box are made of metal. In order to exhibit a good shut-off performance with the valve seat 14, it is necessary to process the valve body valve seat 13 and the valve box valve seat 14 with high accuracy.

  In the gate valve V, after installation at the site of use, the valve box 1 may be bent or distorted by being pushed or pulled from the front and rear pipes P. At this time, since there is a space S as a valve body accommodating portion inside the opening 5 and the lid 6, the opening 5 side of the valve box valve seat 14 is easily affected, and the valve body 2 of the valve box 1 The thickness direction changes. For example, as shown in FIG. 2, the gap width t of the valve box valve seat 14 is larger than the width of the valve body valve seat 13, creating a gap between the two, and exhibits a good blocking property at the manufacturing site. Even if it is adjusted so that it does, there may be a case where it is not possible to exhibit a good barrier property at the site of use.

  Also, when other usage conditions such as the pressure and temperature of the fluid in the piping P at the site of use are changed, the valve box 1 is similarly bent and distorted, and similarly, the opening 5 of the valve box valve seat 14 The interval width t in the thickness direction of the valve body 2 on the side may change under the influence thereof, and may not be able to exhibit good blocking properties.

Conventionally, ribs 11 are provided on the outer surfaces of the opening 5 and the lid 6 in order to increase rigidity. However, the effect is not sufficient with respect to the deflection and distortion of the valve box 1, and a good blocking property is exhibited. Therefore, it is necessary to redesign the valve box valve seat 14 and to change the use conditions.
For this reason, the applicant has proposed a technique in which either or both of the valve box opening 5 and the lid 6 are provided with a correction means for correcting bending or distortion in the thickness direction of the valve body 2 from the outside. By means, it was possible to correct the deflection and distortion on the opening 5 side of the valve box valve seat 14 and realize a good shut-off property (see Patent Document 1, Abstract, FIG. 1, etc.).

JP 2012-202516 A Japanese Utility Model Publication No. 4-134981

The correcting means includes a pair of sandwiching members that sandwich the valve box opening 5 from both sides in the thickness direction of the valve body 2, and sandwiched between both ends of the sandwiching member and projecting outside the valve box opening. It is the structure which has a connection member which connects a pair of clamping member by the protrusion part of an insertion member (refer patent document 1 paragraphs 0021-0022, FIGS. 1-5).
The correction means having this configuration expands and contracts the valve box with a pinching force of the entire length of the pinching member through a pair of long large pinching members. Adjustment) is difficult. Further, it is necessary to make the adjustment of the screwing amount and the like of the connecting member uniform at both ends of the sandwiching member, and the operation is complicated and usually requires two workers.

  This invention makes it a subject to set it as the bending / distortion correction means of the valve body thickness direction of the valve box 1 which is easy to operate under the above actual condition.

In order to solve the above-described problems, the present invention expands and contracts the valve box by pressing the central part in the direction perpendicular to the fluid flow path direction of either or both of the opening of the valve box and the lid. Thus, the deflection and distortion in the thickness direction of the valve body are corrected.
Normally, the opening of the valve box is a plan view, a circle, a rectangle, an ellipse, etc., and is made of a material having elasticity, and if the radial center is pressed, the circle, rectangle, or Ellipses etc. are deformed as a whole. In other words, if a single point concentrated load is applied to the center of the valve box, the valve box can be deformed with a small load. Can be done evenly. At this time, the degree of deformation of the valve box can be adjusted by adjusting the degree of pressing (load). For this reason, the bending and distortion of the valve body thickness direction of a valve box can be corrected appropriately.

  As a specific configuration of the present invention, a valve box having an opening that opens in a direction perpendicular to the internal fluid passage and a metal valve box valve seat, and a valve that is inserted into the valve box through the opening and moves up and down. A valve body that has a metal valve body valve seat attached to the valve stem and opens and closes the fluid passage in the valve box, and is fixed to the opening of the valve box and closes the opening. In a gate valve that moves the valve body in a direction perpendicular to the fluid passage and shuts off the fluid passage by contact between the valve body valve seat and the valve box valve seat, the opening of the valve box and the lid Either or both are provided with a correction means for correcting the deflection or distortion of the valve seat in the thickness direction of the valve body from the outside, and the correction means is a fluid of either the opening of the valve box or the lid. A contact plate that is fixed at the center in the width direction perpendicular to the passage and reaches the other of the opening of the valve box and the lid, and a contact plate that reaches the other side The adjustment valve is screwed into the minute and its tip is in contact with the opening of the valve box and the other surface of the lid. The structure which adjusts the bending of the thickness direction of the valve body of a valve-box valve seat by the pressing force to the opening part or lid | cover of can be employ | adopted.

  Similarly, as other specific configurations, similarly, an opening that opens in a direction perpendicular to the internal fluid passage and a valve box having a metal valve box valve seat, and an elevator that is inserted into the valve box through the opening A valve body that is attached to the valve stem and has a metal valve seat to open and close a fluid passage in the valve box, and is fixed to the opening of the valve box to close the opening. In a gate valve that includes a lid through which a valve stem is inserted, moves the valve body in a direction perpendicular to the fluid passage, and shuts off the fluid passage by contact between the valve body valve seat and the valve box valve seat; Either or both of the lids are provided with a correcting means for correcting the deflection or distortion of the valve seat in the thickness direction of the valve body from the outside, and the correcting means is either one of the opening of the valve box or the lid. A contact plate fixed at both ends along the width direction orthogonal to the one fluid passage, and the center portion of the contact plate in the width direction. It consists of a thickness adjustment bolt that is screwed and whose tip abuts against the other surface. When the adjustment bolt is screwed or unscrewed into the contact plate, the valve bolt is pushed to the opening or lid of the valve box via the adjustment bolt. The structure which adjusts the bending of the thickness direction of the valve body of a valve-box valve seat with pressure can be employ | adopted.

In each of the above configurations, a fixing bolt fixed to the other of the opening of the valve box and the lid is passed through the contact plate adjacent to the adjustment bolt so as to be freely movable in the axial direction, and from the contact plate of the fixed bolt. It is possible to employ a configuration in which a fixing nut is screwed into the protruding end and abuts against the contact plate.
In this configuration, when narrowing the valve box valve seat (decreasing the gap width t in the valve body thickness direction of the valve box valve seat), the adjustment bolt is screwed in similarly to the above, and the opening or lid of the valve box is closed at the tip. Depressing the opening or lid in the concave direction with the pressing force to narrow the gap width in the valve body thickness direction of the valve body valve seat and adjusting its width, and bending the valve body valve seat in the valve body thickness direction Correct the distortion properly.
On the other hand, when widening the valve box valve seat (increasing the gap width t in the valve body thickness direction of the valve box valve seat), after loosening the adjustment bolt and sufficiently opening the gap between the contact plate and the opening or lid ( After the adjustable gap is formed), a fixing nut is screwed into the fixing bolt, and the opening or lid is pulled against the backing plate by the screwing, and the opening or lid is warped in the convex direction by the pulling force. The gap width in the valve body thickness direction of the valve seat is widened and the width is adjusted to appropriately correct the deflection and distortion of the valve box valve seat in the valve body thickness direction.

  In the case of the configuration having the adjusting bolt, the fixing bolt, and the fixing nut, the adjusting bolt may have a through hole over the entire axial center, and the fixing bolt may be passed through the through hole. This configuration is compact.

  The present invention is configured as described above, and the valve box is expanded and contracted by pressing the central part of the valve box so as to correct the deflection and distortion in the thickness direction of the valve body. Can be performed almost evenly, and the deflection and distortion of the valve body in the thickness direction of the valve body can be corrected appropriately.

Partially cutaway front view of one embodiment of a gate valve according to the present invention Partially cutaway side view of the same embodiment The correction | amendment means part of the embodiment is shown, (a) is a partially enlarged front view, (b) is a sectional view of (a). Partially cutaway front view of another embodiment of a gate valve according to the present invention Cutting plan view of the same embodiment The main part of the embodiment is shown, (a) is a cutaway view of the correction means portion, (b) is a cutaway view of the fixing portion of the backing plate.

  1 to 3 show an embodiment of a gate valve according to the present invention. A gate valve V of this embodiment includes a metal cylindrical valve box 1 such as a can product and a cast product, and a metal such as a cast product. A gate valve V composed of a valve body 2 and its valve stem (valve shaft) 3, which is interposed in a pipeline P of gas or the like.

  The valve box 1 has a cylindrical (fluid) flow path 4 in the cylindrical shape, and has an opening 5 at an upper portion in the vertical direction of the fluid flow path 4. A bonnet (lid) 6 is provided above the opening 5, and the valve rod 3 extends upward from the valve body 2 and penetrates the bonnet 6 to reach a lifting / lowering (vertical movement) mechanism 7. The elevating mechanism 7 uses the upper portion of the valve stem 3 as a rack, and rotates a pinion engaged with the rack by a handle 8 to raise and lower the valve stem 3 to raise and lower the valve body 2 and insert it into the valve box 1. , Stored in the bonnet 6.

  The elevating mechanism 7 is not limited to a mechanism that moves the valve body 2 up and down with the valve rod 3, and the valve rod 3 and the valve body 2 can be rotated relative to each other, and the valve rod 3 is rotated and fixed to the bonnet 6 so as not to rotate. Various mechanisms can be employed, such as moving up and down using a female screw nut, and moving the valve rod 3 up and down directly with a cylinder or an electric motor.

The valve body 2 has a disk shape having an inverted trapezoidal cross section reinforced by ribs 11a. The valve body 2 is opened and closed in the valve box 1 through the guides 12a on both sides and the guides 12b on the inner surface of the valve box 1 (in the up-and-down direction). Other than (), it is positioned and can move only in the opening / closing direction (vertical direction).
The valve body 2 is formed with valve body valve seats 13 over the entire outer circumference on both sides, and the valve body 2 is a disk having an inverted trapezoidal cross section. 1 has a wedge shape in which the width in the thickness direction of the valve body 2 gradually decreases in the direction of insertion in the direction (lifting direction). The valve box 1 is provided with a pair of valve box valve seats 14 corresponding to the valve body valve seats 13. The pair of valve box valve seats 14 are wedge-shaped when the valve body 2 is in the fully closed position. The valve body seat 13 and the fluid passage 4 are in contact with each other around the entire circumference of the fluid passage 4, and the valve seats 13 and 14 come into contact with each other and overlap each other to close the valve with a good shut-off property. Usually, the overlapping area of both valve seats 13 and 14 is 50 to 100%.

  The opening 5 of the valve box 1 has a cylindrical shape that protrudes and opens in a direction perpendicular to the fluid passage 4 and has a rectangular shape in plan view. Similarly, the bonnet (lid) 6 has a rectangular shape in plan sectional view. The valve box opening 5 and the bonnet 6 are fastened by bolts via flanges 5a and 6a to be firmly integrated with each other, and the valve body 2 is accommodated therein when fully opened. Ribs 11b and 11c are provided around the valve box opening 5 and the bonnet 6 in order to increase rigidity.

  In addition, this gate valve V is a sealing type (refer patent document 2), and fluid such as water a is filled around the valve seats 13 and 14 from the inlet 16 at the lower part of the valve box 1, and the inside of the bonnet 6 is filled. Are also filled and discharged from the outlet 17 at the top.

  The configuration described above is the same as that of the prior art. In this embodiment, the valve body thickness of the valve box 1 is between the valve box opening 5 and the bonnet 6 on both side surfaces (left and right side surfaces in FIG. 2) of the valve box 1. It is characterized in that means 20 for correcting directional deflection and distortion from the outside are provided.

  The straightening means 20 includes a contact plate 21 that is fixed at the center of the bonnet 6 in the direction perpendicular to the fluid passage 4 (the left-right direction in FIG. 1) and reaches the opening 5, and the contact that reaches the opening 5. An adjusting bolt 22 that is screwed into the end portion of the plate 21 and whose tip abuts against the surface of the opening 5, and a fixing bolt 23 that passes through the contact plate 21 adjacent to the adjusting bolt 22 and is screwed into the opening 5. It consists of. That is, the fixing bolt 23 is fixed to the opening 5 and movably passes through the contact plate 21, and a fixing nut 24 is screwed into the protruding portion. The fixing bolt 23 can be erected on the opening 5 (block 25) by other means such as welding instead of being screwed.

The contact plate 21 is firmly fixed to the bonnet 6 with a bolt 26 through a block 25. The block 25 serves as a seat for the contact plate 21 and is fixed to the bonnet 6 by bolting or welding. The number of the bolts and the number of the bolts 26 is arbitrary as long as the block 25 can be firmly fastened and fixed. At this time, the rib 11b adjacent to the block 25 can be omitted (deleted) as appropriate. Instead of the fixing bolt 26, one end of the contact plate 21 can be fixed to the bonnet 6 (block 25) by other means such as welding.
It is preferable that the rib 11c of the bonnet 6 with which the contact plate 21 abuts is thicker than the other ribs 11c and 11b to increase the rigidity.

The correction means 20 of this embodiment has the above-described configuration, and when the valve box valve seat 14 is narrowed (the gap width t in the valve body thickness direction of the valve box valve seat 14 is narrowed), the adjustment bolt 22 is screwed in at the tip thereof. The valve box opening 5 is pressed, the opening 5 is bent in the concave direction by the pressing force, and the gap width t in the valve body thickness direction of the valve box valve seat 14 is narrowed to adjust the width. 14 correct | amends the bending and distortion of the valve body thickness direction appropriately.
On the other hand, when the valve box valve seat 14 is expanded (the gap width t in the valve body thickness direction of the valve box valve seat 14 is increased), the adjustment bolt 22 is loosened to sufficiently adjust the gap between the contact plate 21 and the opening 5 (adjustable). The fixing nut 24 is screwed into the fixing bolt 23, the opening 5 is pulled toward the backing plate 21 by the screwing, and the opening 5 is bent in the convex direction by the pulling force, thereby the valve box valve seat. The gap width t in the valve body thickness direction of 14 is widened and the width is adjusted to appropriately correct the deflection and distortion of the valve box valve seat 14 in the valve body thickness direction.

The above operation corrects the deflection and distortion of the valve body 1 in the thickness direction of the valve body 1 from the outside, and the entire circumference of the valve body valve seat 13 and the valve body valve seat 14 comes into contact with each other to completely block the flow path 4. To be done.
In this operation, as the rigidity of the bonnet 6 is higher than that of the opening 5 of the valve box 1, the opening 5 is more easily bent than the bonnet 6. Bending and distortion adjustment in the body thickness direction is smooth. At this time, since the contact plate 21 becomes a beam, it is preferable to have rigidity equal to or higher than that of the bonnet 6.

  Other embodiments are shown in FIG. 4 to FIG. 6, and the gate valve V ′ of this embodiment is also of a sealing type, and the above-mentioned gate valve V is a piston (the piston for partitioning the inside of the bonnet 6 up and down in a watertight or airtight manner) The point which has the obstruction | occlusion lid) 40 differs greatly. By having this piston 40, it is possible to reduce the amount of sealing water and gas (for example, nitrogen gas), which is economical, and the pressure receiving area of the valve box 1 and the like is reduced, so that sealing performance is achieved. Is less likely to decrease. In this embodiment, the gate valve V ′ is provided with a correction means 30 having a configuration different from that of the correction means 20.

  The correction means 30 includes a contact plate 31 that extends over substantially the entire length of the opening 5 of the valve box 1, an adjustment bolt 32 that is screwed into the center of the contact plate 31 in the length direction, and an axis of the adjustment bolt 32. And a position fixing nut 35 and 34 screwed into the adjusting bolt 32 and the fixing bolt 33, respectively. The fixing bolt 33 penetrates the through hole 33a on the axis of the adjusting bolt 32 so as to be movable.

  The abutting plate 31 is fixed by bolting both ends to the block-shaped seat 37 of the opening 5. The number of the bolts 36 is arbitrary as long as it can be firmly fastened and fixed. Instead of the fixing bolt 36, both ends of the contact plate 31 can be fixed to the opening 5 by other means such as welding. The interval between the seats 37 at both ends is appropriately set by experiment or the like so that the valve box 1 is bent inward and outward by pressing the center between them. In addition, a similar block-shaped seat 38 is provided in the center between both the seats 37, 37, and the fixing bolt 33 is screwed into the seat 38, and the tip of the adjusting bolt 32 is in contact therewith. The ribs 11b and 11c adjacent to the block seat 38 can be omitted (deleted) as appropriate.

  The correction means 30 of this embodiment has the above-described configuration. When the valve box valve seat 14 is narrowed, the adjustment bolt 32 is screwed, the valve box opening 5 is pressed at the tip, and the opening 5 is recessed by the pressing force. The gap width t in the valve body thickness direction of the valve body valve seat 14 is narrowed by adjusting the width of the valve body valve seat 14 to correct the deflection and distortion of the valve body valve seat 14 in the valve body thickness direction. When the correction is completed, the fixing nuts 34 and 35 are tightened to fix the correction state.

On the other hand, when the valve box valve seat 14 is widened, the adjustment bolt 32 is loosened to sufficiently open the gap between the contact plate 31 and the opening 5 (for example, the tip of the adjustment bolt 32 is placed on the lower surface of the contact plate 31 (through hole). 33a) and flush with the abutting plate 31 (within the through hole 33a), and then tighten the fixing nut 35 so that the adjusting bolt 32 is integrated with the abutting plate 31. In this state, the fixing bolt 33 is fixed. The nut 34 is screwed and the opening 5 is pulled toward the backing plate 31 by the screwing, and the opening 5 is bent in the convex direction by the pulling force to widen the gap width t of the valve body valve seat 14 in the valve body thickness direction. The width of the lever is adjusted to properly correct the deflection and distortion of the valve body valve seat 14 in the valve body thickness direction.
The above operation corrects the deflection and distortion of the valve body 1 in the thickness direction of the valve body 1 from the outside, and the entire circumference of the valve body valve seat 13 and the valve body valve seat 14 comes into contact with each other to completely block the flow path 4. To be done.

In the embodiment of FIG. 4, the adjusting bolt 32 and the fixing bolt 33 may have a structure of two adjacent bolts similarly to the adjusting bolt 22 and the fixing bolt 23 shown in FIG. 1. On the other hand, in the embodiment of FIG. 1, both the adjusting bolts 22 and 23 can be configured as shown in FIG. 6 in which the fixing bolt 33 penetrates the adjusting bolt 32.
In the embodiment of FIG. 1, the head side of the adjusting bolt 22 is made longer than that shown in the drawing, and a nut is screwed to the elongated portion to form a double nut structure.

  In the above embodiment, both the primary side and the secondary side of the valve body valve seat 13 are inclined with respect to the plane perpendicular to the fluid passage 4. For example, the drive when the valve body 2 is opened and closed is very high. When it is desired to reduce the force, the secondary valve body valve seat 13 is provided in parallel with a surface perpendicular to the fluid passage 4, and the primary valve body valve seat 13 is provided in the same manner as in each embodiment. It may be a wedge shape. At this time, the valve box valve seat 14 also has an inverted C shape on the secondary side perpendicular to the fluid passage 4 according to the shape thereof.

  In each of the above embodiments, the valve box opening 5 side is pushed. However, when it is easier to push the bonnet (lid) 6, the bonnet 6 can be provided with correction means 20, 30. In this case, the bonnet 6 side is pressed. If the rigidity of the bonnet 6 is higher than that of the opening 5 of the valve box 1, the reaction force via the contact plate 21 due to the pressing is applied to the opening 5. Similarly, the valve box 1 can be expanded and contracted to adjust the deflection and distortion of the valve box 1 in the valve body thickness direction.

Further, the correction means 20 and 30 may be provided in each of the valve box opening 5 and the bonnet 6, and in this case, the correction means 20 and 30 can be provided so as to be corrected simultaneously across both. In this case, two correction means 20 and 30 are provided on the same surface (for example, the surface in FIG. 1), the correction means 20 and 30 on the valve box opening side on one surface, and the bonnet 6 on the other surface (back surface). The side forcing means 20, 30 can be located.
Further, the fixing bolts 23 and 33 can be omitted and only the adjusting bolts 22 and 32 can be provided. In this case, the tips of the adjustment bolts 22 and 32 are always brought into contact (pressed) with the surface of the opening 5 or the bonnet 6, and the adjustment bolts 22 and 32 are pushed by the screwing amounts of the adjustment bolts 22 and 32 into the contact plates 21 and 31. By adjusting the pressure, the expansion and contraction due to the elasticity of the opening 5 or the bonnet 6 itself is adjusted to adjust the deflection or distortion of the valve body 1 in the thickness direction of the valve body.

In addition, although each said embodiment is a sealing type, even if it is a non-sealing gate valve of patent document 1, the valve box 1 which has the opening part 5 and the metal valve box valve seat 14, The valve body 2 includes a valve body 2 having a metal valve body valve seat 13 attached to the ascending / descending valve stem 3 and a lid (bonnet) 6. Of course, the present invention can be applied to various gate valves that shut off the fluid passage 4 by abutting the valve 13 and the valve seat 14.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

V Gate valve 1 Valve box 2 Valve body 3 Valve rod 4 Fluid flow path 5 Valve box opening 6 Bonnet (lid)
11a, 11b, 11c Rib 12a, 12b Valve body guide 13 Valve body valve seat 14 Valve box valve seat 20, 30 Correcting means 21, 31 Abutting plate 22, 32 Adjustment bolt 23, 33, 36 Fixing bolt 24, 34, 35 Fixing Nut 33a Through hole 37, 38 Seat 40 Piston t Valve box valve seat gap width

Claims (4)

A valve box (1) having an opening (5) and a metal valve box valve seat (14) opened in a direction perpendicular to the internal fluid passage (4), and the valve box (1) from the opening (5) A valve stem (3) that is inserted into the valve rod (3), and has a metal valve seat (13) attached to the valve stem (3), and the fluid passage (4) in the valve box (12). And a lid (6) fixed to the opening (5) of the valve box (1) to close the opening (5) and through which the valve stem (3) is inserted. The valve body (2) is moved in the direction perpendicular to the fluid passage (4), and the fluid passage (4) is blocked by the contact of the valve body valve seat (13) and the valve box valve seat (14). In the gate valve (V),
Deflection and distortion of the valve box valve seat (14) in the thickness direction (t) of the valve body (2) on one or both of the opening (5) and the lid (6) of the valve box (1). A correction means (20) is provided for correcting the fluid from the outside, and the correction means (20) is the fluid passage (4) of either the opening (5) of the valve box (1) or the lid (6). ) And a contact plate (21) reaching the other of the opening (5) of the valve box (1) and the lid (6), and a contact plate (21) leading to the other side. ) Portion, and the tip of the adjustment bolt (22) comes into contact with the opening (5) of the valve box (1) and the other surface of the lid (6). By screwing in or unscrewing the plate (21), the valve box (1) of the valve plate (1) via the adjusting bolt (22) with respect to the backing plate (21) Mouth (5) or the lid valve (2) a partition valve and adjusts the deflection or distortion in the thickness direction of the valve housing valve seat by the pressing force (14) to (6). A valve box (1) having an opening (5) and a metal valve box valve seat (14) opened in a direction perpendicular to the internal fluid passage (4), and the valve box (1) from the opening (5) A valve stem (3) that is inserted into the valve rod (3), and has a metal valve seat (13) attached to the valve stem (3), and the fluid passage (4) in the valve box (12). And a lid (6) fixed to the opening (5) of the valve box (1) to close the opening (5) and through which the valve stem (3) is inserted. The valve body (2) is moved in the direction perpendicular to the fluid passage (4), and the fluid passage (4) is blocked by the contact of the valve body valve seat (13) and the valve box valve seat (14). In the gate valve (V),
Deflection and distortion of the valve box valve seat (14) in the thickness direction (t) of the valve body (2) on one or both of the opening (5) and the lid (6) of the valve box (1). A correction means (30) for correcting the fluid from the outside is provided, and the correction means (30) is provided in either one of the opening (5) and the lid (6) of the valve box (1). A contact plate (31) fixed at both ends along the width direction orthogonal to the passage (4), and screwed into the central portion of the contact plate (31) in the width direction, the tip of the contact plate (31) And an adjustment bolt (32) that abuts on one surface of the lid (6). By screwing or unscrewing the adjustment bolt (32) into the contact plate (31), a contact plate ( 21) against the opening (5) or lid (6) of the valve box (1) via the adjusting bolt (32). Gate valve, characterized in that adjusting the deflection or distortion in the thickness direction of the valve body (2) of the valve housing valve seat (14) by the force.   A fixing bolt (23) fixed to the contact plate (21, 31) adjacent to the adjustment bolt (22, 32) on the other of the opening (5) of the valve box (1) and the lid (6). , 33) is penetrated so as to be movable in the axial direction, and fixing nuts (24, 34) are screwed into projecting ends of the fixing bolts (23, 33) from the contact plates (21, 31). The gate valve according to claim 1, wherein the gate valve is in contact with the valve.   The gap adjusting bolt (22, 32) has a through hole (33a) over the entire axial center, and the fixing bolt (23, 33) is passed through the through hole (33a). The gate valve according to claim 3.

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