Flat gate valve adopting flat forged steel structure

Abstract

The utility model discloses a flat gate valve adopting a flat forged steel structure, which comprises a valve body, a valve cover is arranged at the top of the valve body, a gate plate is arranged in the valve body, the top of the gate plate is fixedly connected with a valve rod, the top of the gate plate is connected with a hand wheel, and the bottom of the valve body is an open bottom. The bottom of the valve body is connected with an end cover through a bolt connecting structure, the section of the valve body is of a rectangular structure, and the wall of the valve body is a thickened wall. The problems that the quality of an existing flat gate valve is difficult to control, a shell is prone to leakage, and 100% detection of the shell cannot be achieved are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of flat gate valve, especially a flat gate valve with flat body forged steel structure. BACKGROUND

[0002] Flat gate valve is a kind of lift type valve, it is widely used in petroleum, natural gas and other conveying systems, mainly as cut-off function, wherein the valve body of CL150 pressure is limited to flat body structure by standard structure length, the valve body of CL150 pressure is made by casting, although the production cost is low by casting, but limited by its manufacturing method, if the flat body valve body made by casting is applied in the working condition containing harmful substances such as H2S, the safety is lower, cannot satisfy the standard of shell zero leakage, the specific reasons are as follows:

[0003] The flat gate valve of existing flat body structure, in order to ensure its mechanical properties, its section is generally designed as oval, and due to the limitation of casting process, oval flat body section is not easy to control, and more defects are prone to occur in the intersection line of valve body flow passage and oval cavity;Then it is that the quality of casting is generally unstable, and cracks, pores, sand eyes and other defects are prone to occur;Finally, because the shape of the flat gate valve of flat body structure is relatively complex, the casting is integrally formed, so the parts cannot be detected 100%.

[0004] In order to solve the above problems, the existing casting production mode needs to be changed into forging production mode, and the structure of the existing flat body flat gate valve needs to be adjusted after improvement. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a flat gate valve with flat body forged steel structure, which solves the problems of difficult control of the quality of the existing flat body flat gate valve, easy occurrence of shell leakage and inability to realize 100% detection of the shell.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] A flat gate valve with flat body forged steel structure, comprising a valve body, a valve cover is arranged at the top of the valve body, a gate plate is arranged in the valve body, the top of the gate plate is fixedly connected with a valve stem, the top of the valve stem is connected with a hand wheel, the bottom of the valve body is an open bottom, an end cover is connected to the bottom of the valve body through a bolt connection structure, the cross section of the valve body is a rectangular structure, and the valve body wall of the valve body is a thickened valve body wall.

[0008] The whole valve body and the internal parts of the gate valve in the scheme are forged by forged steel, so that the nondestructive testing can be carried out on the single valve body, the nondestructive testing of 100% can be realized, and the overall quality is improved; the opening is arranged at the bottom of the valve body, so that the bottom of the valve body becomes an open structure, and the end cover is arranged at the bottom of the valve body and connected to the valve body through the bolt connection structure, so that the valve body is sealed after the parts in the valve body are installed; the movement space of the gate plate and the limiting step of the supporting block are only machined in the inner cavity of the forged steel valve body, the volume of the inner cavity of the forged steel valve body is greatly reduced compared with the cast valve body, the force acting on the end face of the inner cavity is reduced, so that smaller bolts and smaller installation space can be selected, and in addition, in the scheme, the cross section of the valve body is changed from the elliptical shape in the cast valve body to the rectangular structure, so that the mechanical properties of the inner cavity are lost, but the mechanical properties of the inner cavity are similar to the original elliptical cross section by increasing the wall thickness of the cross section.

[0009] As a further preferred embodiment of the utility model, the upper part of the valve body inner cavity wall is processed with a limiting step.

[0010] As a further preferred embodiment of the utility model, the outer wall of the valve body is uniformly welded with a rib ring.

[0011] Due to the change of the shape of the cross section of the valve body, the rib ring is arranged to further improve the mechanical properties.

[0012] As a further preferred embodiment of the utility model, the cross section of the rib ring is in the shape of "T".

[0013] The rib ring with the cross section in the shape of "T" distributes more material away from the neutral axis, can improve the cross section inertia moment, thereby providing higher bending and torsional stiffness with less material, and the well-designed T-shaped rib is several times higher in stiffness than the rectangular rib with the same weight.

[0014] As a further preferred embodiment of the utility model, the rib ring in the shape of "T" comprises a vertical plate part and a wing plate part, the vertical plate part is the part of structure perpendicular to the surface of the valve body, and the wing plate part is the part of structure perpendicular to the vertical plate part at the outer end of the vertical plate part, the width of the wing plate part of the rib gradually linearly narrows from the middle of the valve body to the upper and lower ends of the valve body.

[0015] The stress distribution of different regions of the valve body under the action of internal pressure is uneven, and the mission of the tie bars is to effectively "hold" the outer wall of the valve body and inhibit its deformation, therefore, the tie bars in the high stress area need to provide greater bending stiffness, and the tie bars in the low stress area can be "lightened", in the use process of the flat gate valve, the tie bars crossing the middle cavity part of the valve body bear the greatest stress, and the stress of the part close to the flange end decreases, therefore, in the scheme, in order to further optimize, the width of the wing plate part of the tie bars from the middle of the valve body to the upper and lower ends of the valve body is gradually linearly narrowed, the design is more reasonable, and the overall weight of the tie bars can be reduced under the requirement of strength.

[0016] As a further optimization of the utility model, a flange connection structure between the end cover and the valve body is provided with a pressure-bearing auxiliary sealing structure.

[0017] Since the split type structure is adopted in the scheme, the sealing between the end cover and the valve body needs to be enhanced, and at the same time, in order to inhibit the deformation problem of the bottom of the valve body or the upper part of the end cover due to pressure, a pressure-bearing auxiliary sealing structure is arranged between the end cover and the valve body.

[0018] As a further optimization of the utility model, the pressure-bearing auxiliary sealing structure comprises a sealing groove, a sealing strip and a valve body outer pressure-bearing pressure distribution structure, the sealing groove is arranged at the bottom of the valve body, the sealing groove is arranged along the center line of the bottom surface of the valve body, the sealing strip is matched with the sealing groove, the sealing strip is arranged on the top of the end cover opposite to the sealing groove, the valve body outer pressure-bearing pressure distribution structure comprises a joint clamping mechanism, a valve body connecting structure and an end cover connecting structure, the joint clamping mechanism comprises a clamping plate with a "U" shaped cross section, the clamping opening of the clamping plate is matched with the flange connection structure connecting the valve body and the end cover, the clamping plate arranged around the flange connection structure is divided into a left clamping plate and a right clamping plate from the middle, the valve body connecting structure is fixed on the top of the clamping plate and arranged close to the outer wall of the valve body, the end cover connecting structure is fixed on the bottom of the clamping plate and arranged close to the outer wall of the end cover, the outer wall of the valve body connecting structure is connected with the valve body through bolts, the outer wall of the end cover connecting structure is connected with the end cover through bolts, the outer wall of the valve body connecting structure is provided with an upper bolt pressing mechanism, the outer wall of the end cover connecting structure is provided with a lower bolt pressing mechanism, the bottom of the upper bolt pressing mechanism is in contact with the top surface of the clamping plate, the top of the lower bolt pressing mechanism is in contact with the bottom surface of the clamping plate, the connection block of the outer wall of the valve body connecting structure is threadedly connected with the upper bolt pressing mechanism, and the connection block of the outer wall of the end cover connecting structure is threadedly connected with the lower bolt pressing mechanism.

[0019] The cooperation of the sealing strip and the sealing groove can effectively improve the sealing performance of the valve body and the end cover, then the joint clamping mechanism is arranged around the joint of the flange of the valve body and the flange of the end cover, the bottom surface of the top plate of the joint clamping mechanism is in contact with the top surface of the flange of the valve body, and the top surface of the bottom plate of the joint clamping mechanism is in contact with the bottom surface of the flange of the end cover; when the upper bolt pressing mechanism moves downward and abuts against the top surface of the joint clamping mechanism, the lower bolt pressing mechanism moves upward and abuts against the bottom surface of the joint clamping mechanism, so that the joint clamping mechanism tightly clamps the flange connecting structure between the valve body and the end cover; when the flange connecting structure is stressed, the stress is not only applied to the connecting bolts between the flanges, but also indirectly transmitted to the valve body connecting structure through the upper bolt pressing mechanism and to the end cover connecting structure through the lower bolt pressing mechanism, so that the stress can be effectively dispersed, the flange connecting structure is not prone to deformation, and the service life is longer.

[0020] Compared with the prior art, the utility model can at least achieve one of the following beneficial effects:

[0021] 1、In the whole gate valve of the scheme and its internal parts, the valve body is forged by forged steel, so that it can be detected without damage, and 100% nondestructive testing can be realized, and the quality is improved; because it is not integrally formed by casting, in order to install parts in the valve body, an opening is formed in the bottom of the valve body, so that the bottom of the valve body becomes an open structure; in order to seal the valve body after the parts in the valve body are installed, an end cover connected to the valve body through a bolt connecting structure is arranged at the bottom of the valve body; the inner cavity structure of the flat body forged steel valve body only processes the movement space of the gate plate and the limiting step of the supporting block, the volume of the inner cavity of the flat body forged steel valve body is greatly reduced compared with that of the cast valve body, the force acting on the end surface is reduced, so that smaller bolts and smaller installation space can be selected, and in addition, in the scheme, in order to facilitate installation and the tightness of the cooperation between parts, the cross section of the valve body is changed from an elliptical shape to a rectangular structure, so that the mechanical properties of the inner cavity are lost, but the mechanical properties similar to the original elliptical cross section can be maintained by increasing the wall thickness of the cross section.

[0022] 2、Because the shape of the valve body cross section is changed, the rib ring is arranged to further improve the mechanical properties.

[0023] 3、The rib ring with a T-shaped cross section distributes more material away from the neutral axis, can improve the cross section moment of inertia, thereby providing higher bending and torsional stiffness with less material, and the T-shaped rib with good design is several times higher in stiffness than the rectangular rib with the same weight.

[0024] 4. Under internal pressure, the stress distribution in different areas of the valve body is uneven. The purpose of the tie rod is to effectively "hold" the outer wall of the valve body and inhibit its deformation. Therefore, in high-stress areas, the tie rod needs to provide greater bending stiffness, while in low-stress areas, the tie rod can be "lighter". During the use of the flat gate valve, the tie rod across the middle cavity of the valve body is subjected to the greatest stress, while the stress near the flange end will decrease. Therefore, in this solution, in order to further optimize it, a variation design is adopted in which the width of the wing plate of the tie rod gradually narrows linearly from the middle of the valve body to the upper and lower ends of the valve body. This design is more reasonable and can reduce the overall weight of the tie rod while meeting the strength requirements.

[0025] 5. Since a split structure is used in this solution, it is necessary to enhance the sealing between the end cap and the valve body. At the same time, in order to suppress the deformation of the bottom of the valve body or the top of the end cap due to pressure, a pressure-bearing auxiliary sealing structure is set between the end cap and the valve body.

[0026] 6. The cooperation between the sealing strip and the sealing groove effectively improves the sealing performance of the valve body and end cover. The joint clamping mechanism is set around the junction of the valve body flange and the end cover flange. The bottom surface of its top plate contacts the top surface of the valve body flange, and the top surface of its bottom plate contacts the bottom surface of the end cover flange. When the upper bolt tightening mechanism moves downwards to abut the top surface of the joint clamping mechanism, and the lower bolt tightening mechanism moves upwards to abut the bottom surface of the joint clamping mechanism, the joint clamping mechanism tightly clamps the flange connection structure between the valve body and the end cover. When the flange connection structure is under stress, the force is not only applied to the connecting bolts between the flanges, but is indirectly transmitted to the valve body connection structure through the upper bolt tightening mechanism and to the end cover connection structure through the lower bolt tightening mechanism. This effectively disperses the force, making the flange connection structure less prone to deformation and extending its service life. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Figure 2 for Figure 1 Horizontal cross-sectional view of the valve body.

[0029] Figure 3 for Figure 1 Top view of the valve body before it is connected to the valve cover.

[0030] Figure 4 for Figure 1 Longitudinal cross-section of the valve body.

[0031] Figure 5 This is a cross-sectional view of the tie ring of this utility model.

[0032] Figure 6The utility model discloses a pressure-bearing auxiliary sealing structure and valve body and end cover between connection structure schematic drawing.

[0033] 1-valve body, 11-limit step, 2-valve cover, 3-valve stem, 4-end cover, 5-reinforcing ring, 51-stand plate part, 52-wing plate part, 6-pressure-bearing auxiliary sealing structure, 61-sealing groove, 62-sealing strip, 63-valve body outer pressure-bearing pressure distribution structure, 631-joint clamping mechanism, 632-valve body connection structure, 633-end cover connection structure, 7-upper bolt compression mechanism, 8-lower bolt compression mechanism. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0036] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0037] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, or the orientation or positional relationship commonly understood by those skilled in the art, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term '' set '', '' install '', '' link '', '' connect '' should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can through the intermediate medium indirectly connect, can be two element inside the intercommunication. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model with specific circumstances.

[0040] Specific embodiment 1: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 It shows a kind of flat plate gate valve using flat body forged steel structure, including valve body 1, the top of the valve body 1 is equipped with valve cover 2, the valve body 1 is equipped with gate, the top of the gate is fixedly connected with valve stem 3, the top of the valve stem 3 is connected with hand wheel, it is characterized in that: the bottom of the valve body 1 is open bottom, the bottom of the valve body 1 is connected with end cover 4 by bolt connection structure, the section of the valve body 1 is rectangular structure, the valve body wall of the valve body 1 is thickened valve body wall.

[0041] In the whole gate valve of the present scheme and its internal parts are forged by forging steel, so it can be single nondestructive testing, so it can realize 100% nondestructive testing as a whole, improve the overall quality, then since it is not integrally formed by casting, in order to be able to install parts inside the valve body, opening is set in the bottom of the valve body, so that the bottom of the valve body becomes open structure, in order to seal the valve body after installing the parts inside the valve body, end cover is arranged on the bottom of the valve body and connected with the valve body by bolt connection structure, the inner cavity structure of flat body forged steel valve body only processes the movement space of gate and the limiting step of supporting block, the volume of the inner cavity of flat body forged steel valve body is greatly reduced compared with casting, the force on the end face under the pressure of the inner cavity is reduced, so smaller bolts and smaller installation space can be selected, in addition, in the present scheme, in order to facilitate installation and the tightness of cooperation between parts, the section of the valve body is changed from oval shape in casting to rectangular structure, which will make the inner cavity lose the mechanical properties of oval section, but the mechanical properties similar to the original oval section can be maintained by increasing the wall thickness of the section.

[0042] Specific embodiment 2: this embodiment is further explained on the valve body 1 based on specific embodiment 1, the upper part of the inner cavity wall of the valve body 1 is processed with limiting step 11.

[0043] Specific embodiment 3: this embodiment is further explained on the valve body 1 based on specific embodiment 1, the outer wall of the valve body 1 is evenly welded with pull ring 5.

[0044] Due to the change of the shape of the valve body cross section, the pull ring is arranged to further improve its mechanical properties.

[0045] Specific embodiment 4: This embodiment is a further description of the pull ring 5 based on specific embodiment 3, the cross section of the pull ring 5 is "T" shaped.

[0046] The pull ring with "T" shaped cross section distributes more material away from the neutral axis, which can improve the cross section moment of inertia, thereby providing higher bending and torsional stiffness with less material. A well-designed T-shaped rib is several times stiffer than a rectangular rib of the same weight.

[0047] Specific embodiment 5: This embodiment is a further description of the pull ring 5 based on specific embodiment 4, the "T" shaped pull ring 5 includes a vertical plate part 51 and a wing plate part 52, the vertical plate part 51 is the part of the structure perpendicular to the surface of the valve body 1, and the wing plate part 52 is the part of the structure perpendicular to the vertical plate part 51 at the outer end of the vertical plate part 51. The width of the wing plate part 52 of the pull ring 5 gradually linearly narrows from the middle of the valve body 1 to the upper and lower ends of the valve body 1.

[0048] The stress distribution of different regions of the valve body under internal pressure is not uniform, and the mission of the pull ring is to effectively "hold" the outer wall of the valve body and suppress its deformation, so the pull ring needs to provide greater bending stiffness in the high stress area, and the pull ring can "steal light" in the low stress area. In the use of flat gate valve, the pull ring across the middle cavity part of the valve body bears the greatest stress, while the part close to the flange end bears less stress, therefore in this scheme, in order to further optimize it, the width of the wing plate part of the pull ring from the middle of the valve body to the upper and lower ends of the valve body is gradually linearly narrowed, which is a more reasonable design, which can reduce the weight of the pull ring as a whole while meeting the strength requirement.

[0049] Specific embodiment 6: This embodiment adds a pressure bearing type auxiliary sealing structure 6 based on specific embodiment 1, which is provided at the flange connection structure between the end cover 4 and the valve body 1.

[0050] Due to the adoption of split type structure in this scheme, it is necessary to enhance the sealing between the end cover and the valve body, and at the same time, in order to suppress the deformation problem of the bottom of the valve body or the upper part of the end cover due to pressure, a pressure bearing type auxiliary sealing structure is arranged between the end cover and the valve body.

[0051] Specific embodiment 7: this embodiment is further description of the pressure type auxiliary sealing structure 6 based on specific embodiment 6, the pressure type auxiliary sealing structure 6 includes sealing groove 61, sealing strip 62 and valve body outer pressure type pressure structure 63, the sealing groove 61 is arranged at the bottom of the valve body 1, the sealing groove 61 is arranged along the center line of the bottom surface of the valve body 1, the sealing strip 62 is matched with the sealing groove 61, the sealing strip 62 is arranged on the top of the end cover 4 opposite to the sealing groove 61, the valve body outer pressure type pressure structure 63 includes joint clamping mechanism 631, valve body connecting structure 632 and end cover connecting structure 633, the joint clamping mechanism 631 includes the clamping plate with the section of “U” shape, the clamping mouth of the clamping plate is matched with the flange connecting structure connecting the valve body 1 and the end cover 4, the clamping plate around the flange connecting structure is divided into left clamping plate and right clamping plate from the middle, the valve body connecting structure 632 is fixed on the top of the clamping plate and is arranged close to the outer wall of the valve body 1, the end cover connecting structure 633 is fixed on the bottom of the clamping plate and is arranged close to the outer wall of the end cover 4, the outer wall of the valve body connecting structure 632 is provided with the upper bolt compression mechanism 7, the outer wall of the end cover connecting structure 633 is provided with the lower bolt compression mechanism 8, the bottom of the upper bolt compression mechanism 7 is in contact with the top surface of the clamping plate, the top of the lower bolt compression mechanism 8 is in contact with the bottom surface of the clamping plate, the connecting block of the outer wall of the valve body connecting structure 632 is threadedly connected with the upper bolt compression mechanism 7, and the connecting block of the outer wall of the end cover connecting structure 633 is threadedly connected with the lower bolt compression mechanism 8.

[0052] The cooperation of the sealing strip and the sealing groove can effectively improve the sealing performance of the valve body and the end cover, then the joint clamping mechanism is arranged around the joint of the valve body flange and the end cover flange, the bottom surface of the top plate of the joint clamping mechanism is in contact with the top surface of the valve body flange, and the top surface of the bottom plate of the joint clamping mechanism is in contact with the bottom surface of the end cover flange, when the upper bolt compression mechanism moves downward to abut against the top surface of the joint clamping mechanism, the lower bolt compression mechanism moves upward to abut against the bottom surface of the joint clamping mechanism, so that the joint clamping mechanism tightly clamps the flange connecting structure between the valve body and the end cover, when the flange connecting structure is stressed, the force is not only applied to the connecting bolts between the flanges, but also indirectly transmitted to the valve body connecting structure through the upper bolt compression mechanism and to the end cover connecting structure through the lower bolt compression mechanism, so that the force can be effectively dispersed, and the flange connecting structure is not easy to deform, and has a longer service life.

[0053] Although the utility model has been explained in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A flat gate valve with a flat forged steel structure, comprising a valve body (1), a valve cover (2) on the top of the valve body (1), a gate plate inside the valve body (1), the top of the gate plate being fixedly connected to a valve stem (3), and the top of the valve stem (3) being connected to a handwheel, characterized in that: The bottom of the valve body (1) is an open bottom, the bottom of the valve body (1) is connected with an end cover (4) through a bolt connection structure, the cross section of the valve body (1) is a rectangular structure, and the valve body wall of the valve body (1) is a thickened valve body wall.

2. The flat gate valve using a flat body forged steel structure according to claim 1, characterized in that: The upper part of the inner cavity wall of the valve body (1) is processed to have a limiting step (11).

3. The flat gate valve using a flat body forged steel structure according to claim 1, characterized in that: The outer wall of the valve body (1) is uniformly welded with a rib ring (5).

4. The flat gate valve according to claim 3, characterized in that: The cross section of the rib ring (5) is in a "T" shape.

5. The flat gate valve according to claim 4, characterized in that: The "T" shaped rib ring (5) comprises a vertical plate part (51) and a wing plate part (52), the vertical plate part (51) is a part structure perpendicular to the surface of the valve body (1), and the wing plate part (52) is a part structure perpendicular to the vertical plate part (51) at the outer end of the vertical plate part (51); the width of the wing plate part (52) of the rib ring (5) gradually linearly narrows from the middle part of the valve body (1) to the upper and lower ends of the valve body (1).

6. The flat gate valve employing a flat-rolled steel structure according to claim 1, characterized in that: An auxiliary pressure bearing sealing structure (6) is arranged at the flange connection structure between the end cover (4) and the valve body (1).

7. The flat gate valve according to claim 6, characterized in that: The auxiliary pressure bearing sealing structure (6) comprises a sealing groove (61), a sealing strip (62) and a valve body outer pressure bearing pressure distribution structure (63), the sealing groove (61) is arranged at the bottom of the valve body (1), the sealing groove (61) is arranged along the center line of the bottom surface of the valve body (1), the sealing strip (62) is matched with the sealing groove (61), the sealing strip (62) is arranged on the top of the end cover (4) opposite to the sealing groove (61), and the valve body outer pressure bearing pressure distribution structure (63) comprises a joint clamping mechanism (631), a valve body connecting structure (632) and an end cover connecting structure (633).

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