JP5890929B1 - Gate valve - Google Patents

Abstract

To provide a highly reliable gate valve capable of appropriately pressing a sealing member of a valve body against a valve seat after firmly connecting a valve body and a valve body support. A gate valve 100 according to the present embodiment is configured such that when screws 42 and 44 of valve body end connecting portions 5 and 6 of a valve body support 20 are screwed into screw holes 12 and 14 of the valve body 10, the valve body. 10 and the valve body support 20 are integrated, and the valve body 10 is directed in the valve seat direction D with respect to the longitudinal direction of the valve body 10 as the valve body 10 is connected to the valve body center connecting portions 3 and 4. The fixed plate 50 that is curved and is provided between the central portion 10C of the valve body 10 and the central portion 20C of the valve body support 20 is brought into contact with the valve body support 20, and the curved valve body 10 is brought into contact with the valve body support 20. Connected. [Selection] Figure 1

Description

  The present invention relates to a gate valve.

  Conventionally, gate valves have been used to maintain a vacuum chamber in a semiconductor manufacturing apparatus or the like in a vacuum state, and various gate valves have been proposed.

  This type of gate valve is composed of a valve body to which an annular sealing material pressed against a valve seat having an opening is attached, and a valve body stem connected to the valve body, and the valve body stem in the valve seat direction. A system is applied in which the seal member is pressed against the valve seat by movement to seal the opening of the valve seat.

  In this system, in order to properly seal the opening of the valve seat with the sealing material, the central portion and the end of the sealing material, that is, the sealing material is pressed against the valve seat of the sealing material by the movement of the valve stem. It was required to be performed evenly all around.

  On the other hand, for example, in Patent Document 1, a valve body having a sealing material is suspended from a valve body stem by a valve body support extending laterally with respect to the valve body stem. Is connected to the valve body at two lateral connection portions provided at both ends of the valve body support on both sides of the central connection portion connected to the valve body stem, and is connected to the central connection portion and both sides thereof. There has been proposed a gate valve to which a suspension device is applied in which a space is formed with respect to a valve body in a central portion where adjacent valve body support portions exist.

Patent No. 5655002

  In the gate valve disclosed in Patent Document 1, a rotational moment is generated when the valve body stem is bent by the valve body being pressed against the valve seat by the movement of the valve body stem in the valve seat direction. By twisting or twisting the valve body support, the valve body is bent in a direction toward the valve body with respect to the axial direction of the valve-to-stem. Thus, the valve body is bent according to the reaction force when the valve body is pressed against the seal material, so that the seal material is evenly pressed against the valve seat.

  Here, in the gate valve described in Patent Document 1, if the valve body support is firmly connected and integrated with the valve body at the center portion, the above bending is restricted, and the valve body becomes a valve. It becomes impossible to bend in the direction toward the valve body with respect to the axial direction of the stem. For this reason, it is necessary not to be firmly connected to the valve body at the center portion of the valve body support.

  The object of the present invention is not to employ the above-described method, and is capable of appropriately pressing the sealing member of the valve body against the valve seat after firmly connecting the valve body and the valve body support. It is to provide a high gate valve.

The gate valve of the present invention includes a valve body to which a sealing material pressed against a valve seat having an opening is attached, a valve body support provided on the side opposite to the sealing body of the valve body and connected to the valve body, The valve body stem is connected to the body support in the vertical direction, and the valve body stem is moved in the valve seat direction so that the seal material is pressed against the valve seat to seal the opening of the valve seat. In the valve
The valve body support is provided separately from the valve body, and a gap is formed between the valve body support and the valve body,
In the central part of the valve body support, a valve body stem connection part connected to the valve body stem, and a valve body center part connection part connected to the valve body on both sides of the valve body stem connection part are provided.
At both ends of the valve body support, a valve body end connecting portion connected to the valve body at the end of the valve body is provided,
The valve body end connecting portion includes a screw hole formed at the end of the valve body, a through hole formed at the end of the valve body support, and a screw inserted through the through hole and screwed into the screw hole. And consist of
A fixing plate is provided between the valve body and the valve body support, in which a contact surface that contacts the central portion of the valve body and the central portion of the valve body support is formed,
When the screw of the valve body end connection part is screwed into the screw hole of the valve body, the valve body and the valve body support are integrated, and the valve body is connected with the connection of the valve body of the central part of the valve body. The valve body is curved toward the valve seat direction with respect to the longitudinal direction of the valve body, the fixing plate is brought into contact with the valve body support, and the curved valve body is connected to the valve body support.

  In addition, when the valve body seal is pressed against the valve seat by the movement of the valve body stem in the valve seat direction, the gate valve of the present invention presses the valve body against the pressure on the valve seat and the pressure on the valve seat. In addition, a rotational moment force in the valve seat direction centered on the central part of the valve body is applied to both ends of the valve body by pressing force and reaction force. Yes.

  The gate valve of the present invention is characterized in that the fixed plate includes a shim plate formed in a plate shape having a predetermined thickness and a mounting plate for attaching the shim plate to the valve body.

  Since the gate valve of the present invention is configured as described above, the valve body and the valve body support are firmly connected, and the valve body seal member can be appropriately pressed against the valve seat. A high gate valve can be provided.

It is a schematic perspective view which shows the structure of the gate valve of the Example of this invention. It is a figure which decomposes | disassembles and shows the structure of the gate valve of the Example of this invention. It is a figure which shows the AA arrow cross section of the gate valve of FIG. It is a top view of the gate valve of FIG. 1, and is a figure explaining the example of operation | movement of the gate valve of the Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  A gate valve of an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below.

  FIG. 1 is a schematic perspective view showing the configuration of the gate valve of this embodiment, FIG. 2 is an exploded view of the configuration of the gate valve of this embodiment, and FIG. 3 is the gate valve of FIG. It is a figure which shows the AA arrow cross section of this, and is a figure which shows the sealing state to the valve seat of a valve body.

  The gate valve 100 of the present embodiment is provided on the valve body 10 to which the sealing material 1 pressed against the valve seat 200 having the opening 210 is attached, and is provided on the side opposite to the sealing material of the valve body 10 and is connected to the valve body 10. The valve body support 20 and the valve body stem 30 connected to the valve body support 20 in the vertical direction, and the valve body stem 30 is moved in the valve seat direction D to press the sealing material 1 against the valve seat 200. Then, the opening 210 of the valve seat 200 is sealed.

  Further, the valve body support 20 is provided separately from the valve body 10. Thereby, a gap g is formed between the valve body 10 and the valve body support 20. Further, the central portion 20C of the valve body support 20 includes a valve body stem connection portion 2 connected to the valve body stem 30 and both sides of the valve body stem connection portion 2 at the center portion 10C of the valve body 10. The valve body center part connection part 3 and 4 connected with this valve body 10 are each formed.

  Further, on both end portions 27 and 29 of the valve body support 20, valve body end connection portions 5 and 6 connected to the valve body 10 at the end portions 17 and 19 of the valve body 10 are formed, respectively.

  Further, the valve body end connecting parts 5 and 6 are formed by screw holes 12 and 14 formed in the end parts 17 and 19 of the valve body 10 and through holes 22 formed in the end parts 27 and 29 of the valve body support 20, respectively. 24 and screws 42 and 44 inserted through the through holes 22 and 24 and screwed into the screw holes 12 and 14.

  Further, a fixing plate 50 is formed between the valve body 10 and the valve body support 20 and formed with contact surfaces 50A and 50B that contact the central portion 10C of the valve body 10 and the central portion 20C of the valve body support 20. Provided.

  Further, when the screws 42 and 44 of the valve body end connecting portions 5 and 6 are screwed into the screw holes 12 and 14 of the valve body, the valve body 10 and the valve body support 20 are integrated, and the valve body center portion is connected. As the screws 46 and 48 of the parts 3 and 4 are screwed into the screw holes 16 and 18, the valve body 10 is bent in the valve seat direction D with respect to the longitudinal direction of the valve body 10, and the fixing plate 50 Is brought into contact with the valve body support 20, and the curved valve body 10 is connected to the valve body support 20.

  In this manner, the valve body and the valve body support are firmly connected, and the bending of the gate valve valve body 10 in the direction of the axis 8 of the valve body stem 30 is restricted.

  Further, in the gate valve 100 of the present embodiment, when the valve body stem 30 is moved in the valve seat direction D and the sealing material 1 of the valve body 10 is pressed against the valve seat 200, the valve body 10 is moved to the valve seat 200. It is curved in the longitudinal direction toward the anti-seal material side by the reaction force F caused by pressing.

  Further, along with the curvature of the valve body 10, a reaction force F due to the pressure on the valve seat 200 is applied to the valve body surface 10 </ b> A, and the valve body 10 is subjected to both ends 17 of the valve body 10 by this applied force. 19 is configured so that the valve body 10 is linear.

  The gate valve 100 according to the present embodiment has the above-described configuration to firmly connect the valve body 10 and the valve body support 20 while maintaining the gap g, and to the valve seat 200 by bending the valve body 10 in the longitudinal direction. The valve body 10 at the time of pressing is made linear, and it is possible to evenly press the sealing material 1 of the valve body 10 on the valve seat 200 over the entire circumference of the sealing material 1. Hereinafter, the gate valve 100 of the present embodiment will be described in detail.

  The valve body 10 is made of a metal, and is formed in a horizontally long rectangular shape having a predetermined thickness. Moreover, although the corner | angular part of the valve body 10 is each formed in circular arc shape in the example shown in a figure, another shape may be sufficient.

  In the valve body 10, the sealing material 1 is attached to the valve body surface 10A on the valve seat 200 side. As the sealing material 1, a material using an annular rubber material suitable for sealing in a vacuum atmosphere is used. As shown in FIG. 3, the sealing material 1 is used by being embedded in an annular groove 15 formed in the valve body 10.

  Further, a groove 11 is formed in the valve body surface 10B on the opposite side so as to be continuous with the central portion 10C of the valve body 10 in the height direction. As a result, a surface 11A is formed in the groove 11. The groove 11 is formed with a rectangular groove 13 for embedding a fixing plate 50 described later. The groove portion 13 is formed to provide a fixing plate 50 between the central portion 10C of the valve body 10 and the central portion 20C of the valve body support 20 with respect to a protruding portion 21 of the valve body support 20 described later. Further, the size of the groove 13 is a slightly larger groove than the fixed plate 50 in order to embed the fixed plate 50.

  Further, holes 57B and 58B for attaching attachment means 53 and 54 such as screws for attaching the fixing plate 50 to the valve body 10 are formed in the groove 13. The holes 57B and 58B are formed in accordance with the shape of the fixed plate 50. In the present embodiment, two holes 57 </ b> B and 58 </ b> B are provided in parallel with the longitudinal direction of the valve body 10 in accordance with the shape of the fixed plate 50.

  Further, the valve body 10 is formed with holes 16 and 18 for attaching connecting means 46 and 48 such as screws for connecting the valve body support 20 from the valve body surface 10B side in the vicinity of both sides of the groove 11. ing.

  Further, the valve body 10 is provided with connecting means 42 and 44 such as screws for connecting the end portions 27 and 29 of the valve body support 20 from the valve body surface 10B side to the end side sides 17 and 19 of the valve body 10. Holes 12 and 14 are formed respectively.

  Here, each of the holes 12, 14, 16, 18, 57B, and 58B is formed with a female screw portion for screwing when the corresponding screw is attached. Further, as shown in the figure, grooves 12, 12A, 14A for providing members such as washers may be formed in the holes 12, 14, 16, 18, 57B, 58B.

  The valve body 10 having the above-described configuration is connected to a valve body support 20 described later, and the valve seat 200 having the opening 210 is moved by the movement of the valve body stem 30 connected so as to be orthogonal to the valve body support 20. The valve seat 200 is pressed through the sealing material 1. Hereinafter, the direction of movement of the valve body 10 toward the valve seat 200 is referred to as a valve seat direction D.

  The valve body support 20 is made of metal, and is formed in a horizontally long rectangular shape having a predetermined thickness. The valve body support 20 is provided separately from the valve body 10 with a gap g. Thereby, it can connect with the valve body support 20 with the valve body 10 curved, and since there exists the gap | interval g, the loss of the rotational moment force M21 and M22 by a surface contact can be prevented.

  Further, a protruding portion 21 that protrudes and extends in the thickness direction is formed on a surface 20A of the central portion 20C of the valve body support 20 that faces the valve body 10. The protrusion 21 is brought into contact with a contact surface 50B of a fixing plate 50, which will be described later, on the surface 21A of the protrusion 21, and is contacted with the central portion 10C of the valve body 10 by connection to the valve body support 20 of the valve body 10. It is formed in order to quickly press the fixed plate 50 in contact with 50A.

  Here, in the gate valve 100 of the present embodiment, by providing the groove portion 11 of the valve body 10 and the protruding portion 21 of the valve body support 20, the total thickness dimension of the connected valve body 10 and the valve body support 20 is reduced. However, the grooves 11 and the protrusions 21 do not have to be provided, and even with this configuration, the effects of the present embodiment can be achieved.

  Further, a valve body stem coupling portion 2 coupled to the valve body stem 30 is formed at the central portion 20C of the valve body support 20.

The valve body stem connecting portion 2 is open to a mounting means 41 such as a screw for attaching the valve body support 20 to the valve body stem 30 and to the upper surface 20D of the valve body support 20 in a direction perpendicular to the valve body support 20. It consists of the formed hole 23. The hole 23 is a hole for accommodating the attachment means 41.
Further, in the central portion 20C of the valve body support 20, on both sides of the valve body stem connecting portion 2, the valve body central portion connecting portions 3, 4 connected to the valve body 10 by the central portion 10C of the valve body 10; Are formed respectively.

  These valve body center part connection parts 3 and 4 penetrate toward the valve seat direction D and attachment means 46 and 48 such as screws for attaching the valve body support 20 to the valve body 10 at the central part 10C of the valve body 10. It consists of the hole parts 26 and 28 formed in this way. The valve body central portion connecting portions 3 and 4 make a firm connection between the valve body 10 and the valve body support 20, which are integrated, and after the connection with the valve body stem 30, the shaft of the valve body stem 30. The bending of the valve support 20 with respect to the direction is restricted.

  Further, on both end portions 27 and 29 of the valve body support 20, valve body end connection portions 5 and 6 connected to the valve body 10 at the end portions 17 and 19 of the valve body 10 are formed, respectively.

  The valve body end coupling parts 5 and 6 are respectively provided with attachment means 42 and 44 such as screws for attaching the valve body support 20 to the valve body 10 at the end parts 17 and 19 of the valve body 10, and in the valve seat direction. It consists of the hole parts 22 and 24 which penetrated and formed toward. In addition, the valve body edge part connection parts 5 and 6 are good also as a structure which does not provide a screw | thread.

  Further, the valve body support 20 is formed with a protruding portion 25B that extends downward and protrudes downward on the lower surface of the central portion 20C when the valve body support 20 is viewed from the surface 20B side. Further, when the valve body support 20 is viewed from the upper surface 20E side, the valve body support 20 is inclined from the central portion 20C toward the end portions 27 and 29 to be thin. By the inclination of the projecting portion 25 and the end portions 27 and 29, it is possible to reduce the weight and the space while maintaining the required rigidity of the valve body support 20.

  The valve body 10 connected as described above is connected to the valve body end portion connecting portions 5 and 6 after the connection between the valve body 10 and the valve body support 20 according to the thickness of the fixing plate 50. The bending amount of the valve body 10 accompanying the screwing of the three and four screws 46 and 48 into the screw holes 16 and 18 can be adjusted.

  In this way, when the screws 42 and 44 of the valve body end connecting portions 5 and 6 are screwed into the screw holes 12 and 14 of the valve body, the valve body 10 and the valve body support 20 are integrated, and the center of the valve body The valve body 10 is bent in the valve seat direction D with respect to the longitudinal direction of the valve body 10 as the screws 46 and 48 of the joint portions 3 and 4 are screwed into the screw holes 16 and 18 and fixed. The plate 50 is brought into contact with the valve body support 20, and the curved valve body 10 is connected to the valve body support 20.

  The fixing plate 50 is provided between the valve body 10 and the valve body support 20, and contact surfaces 50 </ b> A and 50 </ b> B that contact the central portion 10 </ b> C of the valve body 10 and the central portion 20 </ b> C of the valve body support 20 are formed. . In the present embodiment, the fixing plate 50 has a width, height and thickness smaller than the groove portion 11 of the valve body 10, and a mounting plate 55 formed in a small rectangular shape accommodated in the groove portion 13, and a shim plate 56.

  Holes 51 and 52 for receiving attachment members 53 and 54 such as screws are formed in parallel on the attachment plate 55, and attachment members 53 and 54 such as screws are inserted into the shim plate 56. Holes 57A and 58A for this purpose are formed in parallel. In this case, the contact surface 50A of the fixed plate 50 is formed on the shim plate 56, and the contact surface 50B of the fixed plate 50 is formed on the mounting plate 55.

  The fixing plate 50 is attached to the valve body 10 at the center portion 10C of the valve body 10 by the above configuration, but may be attached to the valve body support 20 at the center portion 20C of the valve body support 20.

  With the above configuration, the valve body 10, the valve body support 20, the valve body stem 30 and the fixing plate 50 are connected and fixed as follows.

  First, the shim plate 56 and the mounting plate 55 are sequentially accommodated in the groove portion 13 of the central portion 10C of the valve body 10, and the shim plate 56 and the mounting plate 55 are connected to the valve body 10 by screwing of the screws of the mounting members 53 and 54 or the like. It is attached to the valve body 10 at the central portion 10C of and fixed to the valve body 10.

  Next, the valve element 10 is provided in juxtaposition with the valve element support 20, and the valve element support 20 is connected to the valve element end parts 17, 19 of the valve element 10 by the valve element end connecting parts 5, 6 of the valve element support 20. Attach to 10.

  Next, the valve body support 20 is attached to the valve body 10 at the central portion 10 </ b> C of the valve body 10 by the valve body center part connecting portions 3 and 4 of the valve body support 20.

  By these connections, the valve body 10 and the valve body support 20 are firmly connected, and the bending of the valve body 10 in the axial direction of the valve body stem 30 is restricted.

  As described above, the gate valve 100 of this embodiment is configured. The gate valve 100 is used, for example, housed in a housing-like valve box (not shown) having a hollow inside. In this case, the valve seat 200 and the opening 210 are formed in this valve box.

  In the gate valve 100 of this embodiment, a drive mechanism (not shown) is connected to the other end of the valve body stem 30. By driving the drive mechanism, the valve body stem 30 is moved in the valve seat direction D, and the opening 210 of the valve seat 200 is sealed by pressing the sealing member 1 of the valve body 10 against the valve seat 200.

  As this drive mechanism, for example, it is composed of a block body provided at the lower part of the valve box. A cylinder and a piston rod are provided in this block body, and others are used. Thereby, the drive mechanism causes the compressed air to flow into the cylinder from the outside, generates a drive force that raises the piston rod by this compressed air, and transmits the drive force to the valve body stem 30 via the piston rod, The valve body stem 30 is moved upward.

  The drive mechanism may use a servo motor and an electric actuator that generates a drive force by converting a rotational force from the servo motor into a linear motion.

  The operation of the gate valve 100 of the present embodiment having the above-described configuration will be described with reference to FIG.

  FIG. 4 is a plan view of FIG. 1, illustrating an example of the operation of the gate valve according to the embodiment of the present invention. FIG. 4 is a partial cross-sectional view. In this figure, FIG. 4A is a state before the valve body 10 is pressed against the valve seat 200, and shows an example in which the thickness of the fixing plate is t1, and FIG. It is a figure which shows the state after pressing the valve body 10 to the valve seat 200, FIG.4 (c) is the same state as Fig.4 (a), Comprising: The thickness of a fixing plate is t2 (t1> t2). It is a figure which shows an example.

  4A, first, the valve body stem 30 is moved in the valve seat direction D by driving a drive mechanism (not shown), and the valve body 10 is also moved in the valve seat direction D accordingly. The Next, the valve body 10 is pressed against the valve seat 200 via the sealing material 1 to crush the sealing material 1 and the opening 210 of the valve seat 200 is sealed.

  At this time, the pressing force S applied to the valve seat 200 transmitted from the drive mechanism acts on the central portion 10C of the valve body 10. In addition, a reaction force F generated by pressing the sealing material 1 against the valve seat 200 acts on the valve body 10 in the opening direction E, and the valve body 10 is curved toward the opening direction E with respect to the longitudinal direction. Deformed. In other words, the shape of the valve body 10 is close to a straight line. Here, the reaction force F includes a reaction force from the sealing material 1 and a differential pressure applied to the valve seat 200 from within the valve box when the valve body 10 is pressed against the valve seat 200. This reaction force F acts on the surface 10 </ b> A of the valve body 10.

  Along with the deformation of the valve body 10, the reaction force F is applied to the valve body via the fixing plate 50 that contacts the central portion 10 </ b> C of the valve body 10 and the central portion 20 </ b> C of the valve body support 20 at the contact surface 50 </ b> A and the contact surface 50 </ b> B, respectively. It is transmitted to the support 20. Further, the reaction force F is transmitted to the valve body support 20 via the valve body connecting portions 5 and 6.

  Further, the transmitted force F and the pressing force S applied to the valve seat 200 cause the end portions 27 and 29 of the valve body support 20 to be centered on the central portion 10C of the valve body 10 with respect to the longitudinal direction of the valve body 10. Rotational moment forces M21 and M22 in the valve seat direction D are generated.

  The generated rotational moment forces M21 and M22 are transmitted to the valve body 10 via the connecting members 42 and 44 of the valve body end connecting portions 5 and 6, respectively. That is, the end portions 17 and 19 of the valve body are pushed in the valve seat direction D through the connecting members 42 and 44.

  Here, the valve body 10 that is curved in the opening direction E as described above pushes the sealing material 1 to the valve seat 200 on the end portions 17 and 19 side with respect to the central portion 10C side of the valve body 10. Although the pressure is reduced, the end portions 17 and 19 of the valve body 10 are pushed in the valve seat direction D by the above-described rotational moment forces M21 and M22. The pressing force of the sealing material 1 on the valve seat 200 on the 19th side becomes equal. In this way, the pressing force P applied to the valve seat 200 applied to the entire sealing material 1 of the valve body 10 becomes uniform, so that the amount of crushing of the sealing material 1 becomes uniform over the entire sealing material 1.

  In this way, the gate valve 100 of the present embodiment presses the valve seat 10 of the sealing material by the bending of the valve body 10 in the longitudinal direction while the bending of the valve body stem 30 in the axial direction of the valve body 10 is restricted. Perform evenly and achieve proper sealing.

  Thus, the gate valve 100 of the present embodiment firmly connects the valve body and the valve body support, and the valve body seal material to the valve seat is curved by bending in the valve seat direction with respect to the longitudinal direction of the valve body. Since the pressure is uniformly distributed over the entire circumference of the sealing material, the connection between the valve body and the valve body support is firmly made, so these positions do not become indefinite. It is easy to press the valve seat, and a highly reliable gate valve can be provided.

  The gate valve 100 of the present embodiment is also provided with the above-described configuration, so that the reaction force of the sealing material applied from the sealing material to the valve body by the pressing of the sealing material to the valve seat and the sealing to the valve seat. Even when the valve body is curved in the direction opposite to the valve seat direction, that is, in the direction to open the seal, due to the differential pressure applied to the valve body, etc., the bending of the valve body in the longitudinal direction is used. By doing so, an appropriate sealing can be performed by evenly pressing the valve seat of the sealing material. This will be described below.

  In the case of the example of FIG. 4 (a), the fixing plate 50 having a thickness t1 is configured such that the screws 42 and 44 of the valve body end connection parts 5 and 6 are screwed into the screw holes 12 and 14 of the valve body and the valve body center part. After the valve body 10 is bent toward the valve seat direction D with respect to the longitudinal direction of the valve body 10, as the screws 46 and 48 of the connecting portions 3 and 4 are screwed into the screw holes 16 and 18, Since the thickness is larger than that of the fixing plate 50 having the thickness t2, the valve body support 20 is contacted before the fixing plate 50 having the thickness t2.

  In this way, as shown in the drawing, the bending state B1 with a small amount of bending of the valve body 10 is set to a shape closer to a straight line than in the case where the valve body 10 is B2 described later. In this example, the valve body 10 in the bent state B1 is connected to the valve body support 20.

  In the case of the example of FIG. 4C, the thickness of the fixed plate 50 is t2, which is smaller than t1. In this case, the valve body 10 is brought into contact with the valve body support 20 after being largely curved as compared with the case where the fixing plate 50 having the thickness t1 is used.

  Thus, as shown in the figure, the valve body 10 is set to a bending state B2 with a large amount of bending, and the valve body 10 is made to have a shape closer to an arc. In this example, the valve body 10 in the curved state B <b> 2 is connected to the valve body support 20.

  Therefore, the bending amount of the bent valve body 10 can be changed by changing the thickness of the fixed plate 50.

  Thus, in the gate valve 100 of the present embodiment, the amount of bending of the valve body 10 connected to the valve body support 20 is set according to the thickness of the fixed plate 50.

  Since the gate valve 100 of the present embodiment has the above-described configuration, the reaction force F of the sealing material 1 applied to the valve body 10 from the sealing material 1 due to the pressing of the sealing material 1 to the valve seat 200 and the valve seat 200 Even if the valve body 10 is curved toward the side opposite to the valve seat direction D, that is, the direction E in which the sealing is released, due to the differential pressure on the valve body 10 generated at the time of sealing, the fixing plate 50 By changing the thickness of the valve body and adjusting the amount of bending of the valve body 10, the valve seat of the sealing material can be pressed evenly.

  Here, as shown in FIG. 4, the gate valve 100 of the present embodiment is provided between the valve body 10 and the valve body support 20 except for the contact portion by the fixing plate 50. Are provided with gaps g1, g2, and g3.

  Thereby, it can connect with the valve body support 20 with the valve body 10 curved, and the loss of rotational moment force M21, M22 and the pressing force S by surface contact can be prevented. The gate valve 100 of the present embodiment is configured such that a gap is provided between the valve body 10 and the valve body support 20 in any state in order to achieve the above effects.

  Further, in the gate valve 100 of the present embodiment, the fixing plate 50 is constituted by the mounting plate 55 and the shim plate 56, so that the mounting plate 55 remains the same and a plurality of shim plates 56 having different thicknesses are prepared. The gate valve 100 can be provided which can quickly seal the sealing material 1 appropriately according to the situation by adjusting the thickness with a plurality of shim plates 56 according to the situation and attaching it to the valve body 10. .

  According to the gate valve of the embodiment of the present invention, with the above-described configuration, the valve body and the valve body support are firmly connected, and the pressure of the sealing member of the valve body to the valve seat can be appropriately performed. High gate valve can be provided.

  Moreover, the attachment position of the valve body end part connection part and valve body center part connection part of a present Example may be other than illustration, for example, you may make it the height position of each attachment differ. Even with this configuration, it is possible to provide a gate valve that achieves the same effect as the above-described embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Seal material, 2 ... Valve body stem connection part, 3, 4 ... Valve body center part connection part, 5, 6 ... Valve body end part connection part, 10 ... Valve body, 10C ... Center part of valve body, 17, DESCRIPTION OF SYMBOLS 19 ... End part of valve body, 20 ... Valve body support, 27, 29 ... End part of valve body support, 20C ... Central part of valve body support, 30 ... Valve body stem, 50 ... Fixing plate, 50A ... Contact surface, DESCRIPTION OF SYMBOLS 100 ... Gate valve, 200 ... Valve seat, 210 ... Opening, g ... Gap, D ... Valve seat direction, M21, M22 ... Rotational moment force, P, S ... Pressing force.

Claims (3)

A valve body to which a sealing material to be pressed against a valve seat having an opening is attached, a valve body support provided on the anti-seal material side of the valve body and connected to the valve body, and a vertical connection to the valve body support In the gate valve, the valve body stem is sealed, and the valve body stem is pressed in the valve seat direction so that the seal member is pressed against the valve seat to seal the opening of the valve seat.
The valve body support is provided separately from the valve body, and a gap is formed between the valve body support and the valve body,
In the central part of the valve body support, a valve body stem connection part connected to the valve body stem, and a valve body center part connection part connected to the valve body on both sides of the valve body stem connection part are provided.
At both ends of the valve body support, a valve body end connecting portion connected to the valve body at the end of the valve body is provided,
The valve body end connecting portion includes a screw hole formed at the end of the valve body, a through hole formed at the end of the valve body support, and a screw inserted through the through hole and screwed into the screw hole. And consist of
A fixing plate is provided between the valve body and the valve body support, in which a contact surface that contacts the central portion of the valve body and the central portion of the valve body support is formed,
The screw of the valve body end connecting portion is screwed into the screw hole of the valve body so that the valve body and the valve body support are integrally connected, and the valve body is directed in the valve seat direction with respect to the longitudinal direction of the valve body. A gate valve characterized in that it is curved , the fixing plate is brought into contact with the valve body support, and the curved valve body is connected to the valve body support.   2. The gate valve according to claim 1, wherein when the valve body stem is moved in the valve seat direction and the sealing material of the valve body is pressed against the valve seat, the valve body is pressed against the valve seat and pressed against the valve seat. And a rotational moment force in the valve seat direction centered on the central part of the valve body is applied to both ends of the valve body by pressing force and reaction force. Gate valve to be used.   3. The gate valve according to claim 1 or 2, wherein the fixed plate includes a shim plate formed in a plate shape having a predetermined thickness, and a mounting plate for attaching the shim plate to the valve body. valve.

Images