Wedge gate valve with adjustable supporting mechanism

Abstract

The utility model discloses a wedge gate valve with an adjustable supporting mechanism, relates to the technical field of gate valves, and solves the problem that a sealing surface is abraded too quickly due to excessive downward movement of a gate plate. The supporting mechanism comprises a supporting piece and an adjusting piece. The adjusting piece is movably arranged on the valve body and penetrates through the valve body from outside to inside to the bottom cavity. The supporting piece is arranged above the adjusting piece so as to adjust the position of the supporting piece, and the supporting piece abuts against and makes contact with the gate plate in the closed state. The bottom of the flashboard is mechanically supported by the supporting piece, excessive downward movement of the flashboard caused by inertia or valve rod driving errors when the flashboard is closed is directly prevented, excessive pressure between the flashboard and the valve seat is avoided, abrasion of a sealing face is reduced, loss of a sealing layer is reduced, and the overall service life of the gate valve is prolonged. The height of the supporting piece can be adjusted from the outside of the valve body through the adjusting piece, the contact tightness of the flashboard and the valve seat is dynamically adjusted according to actual working conditions such as medium pressure, temperature and abrasion conditions, too tight or too loose contact is avoided, and the sealing reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a wedge-type gate valve with an adjustable supporting mechanism. Background Art

[0002] As a key component for media shutoff and flow control in industrial pipeline systems, wedge-type gate valves rely on the valve stem to drive the gate disc up and down, ensuring a tight fit between the disc and the valve seat to achieve a seal. During the gate closing process, the valve stem drives the gate disc downward. Because the gate closing action in existing technologies relies entirely on the linear motion of the valve stem and lacks a simple travel limiter or buffer mechanism, operational inertia or mechanical clearance can easily cause the gate disc to move downward excessively. This excessive downward movement generates pressure between the gate disc and the valve seat that far exceeds the design standard, exacerbating wear on the sealing surfaces of both, leading to a rapid decline in sealing performance and an increased risk of media leakage. To address the issue of uncontrolled valve stem drive stroke, the closing position is generally controlled by manual operator experience, without a simple and low-cost mechanical limiter. This makes the risk of excessive downward movement difficult to avoid. Furthermore, over long-term use, factors such as the gate disc's own gravity and the media pressure will also generate continuous localized pressure on the valve seat, further accelerating wear on the sealing surface and shortening the gate valve's service life.

[0003] Furthermore, existing wedge-type gate valve structures generally make it difficult to adjust the gate's lowering position, making it difficult to dynamically control the contact pressure between the gate and the valve seat based on actual operating conditions. When operating conditions such as medium pressure and temperature change, the contact between the gate and the valve seat cannot be adaptively adjusted. This can easily lead to excessive contact, resulting in increased opening and closing resistance and wear, or excessive contact, resulting in a poor seal. These conditions seriously affect the stability and reliability of the wedge-type gate valve. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the prior art, provide a wedge-type gate valve with an adjustable support mechanism, and solve the problem of rapid wear of the sealing surface caused by excessive downward movement of the gate plate.

[0005] The technical solution of the utility model includes a gate, a valve body and a valve seat. When the valve is in a closed state, a bottom cavity is formed between the bottom side of the gate and the inner wall of the valve body, and a sealing layer is provided on the gate and the valve seat. A supporting mechanism is provided at the position of the bottom cavity, and the supporting mechanism includes a supporting part and an adjusting part. The adjusting part is movably provided on the valve body and penetrates the valve body from the outside to the inside to the bottom cavity. The supporting part is placed above the adjusting part to adjust the position of the supporting part, and the supporting part is in contact with the gate in the closed state.

[0006] By adopting the above technical solution, the mechanical support of the bottom of the gate plate by the support member can directly prevent the gate plate from moving downward excessively due to inertia or valve stem drive error when closing, avoid excessive pressure between the gate plate and the valve seat, reduce sealing surface wear, and thus reduce sealing layer loss, thereby extending the overall service life of the gate valve; the support member height can also be adjusted from the outside of the valve body by using the adjustment member, and the contact tightness between the gate plate and the valve seat can be dynamically adjusted according to actual working conditions such as medium pressure, temperature, wear and other factors to avoid contact that is too tight or too loose, thereby improving sealing reliability.

[0007] In one possible design, the support member includes a base portion in a lower position and a guide portion in an upper position; a limiting groove is provided on the inner wall of the valve body, and the base portion can be floated in the limiting groove, the top surface of the base portion is pressed against the gate plate, and the bottom surface of the base portion is pressed against the adjusting member; a side groove is provided inwardly at the outer edge of the gate plate, and the guide portion is arranged along the radial direction of the gate plate. When the gate plate is closed, the side groove covers the outside of the guide portion and is adapted to the shape of the guide portion.

[0008] With the above design, the top surface of the base supports the gate pressure, and the base floats up and down in the limit groove, ensuring that the support member can only adjust its position along the radial direction of the gate to avoid shaking and improve the support stability; and the guide part is adapted to the shape of the gate side groove, forming an inserted guide when the gate is closed, limiting the lateral deviation of the gate, assisting the gate to align with the valve seat, and further reducing deviation wear.

[0009] In a possible design, the guide portion includes a hemispherical head at a top end and a frustum at a bottom end, the hemispherical head forms a spherical contact with the groove bottom of the side groove, and the frustum forms an inclined surface contact with the groove wall of the side groove.

[0010] With the above design, the spherical contact allows the gate to deflect at a small angle, reducing the friction resistance during the closing process; and the inclined surface has the effect of automatic progressive centering. Even if the gate deviates slightly during the descent process, the position can be automatically corrected through the guidance of the inclined surface, ensuring that the gate and the valve seat sealing surface fit evenly, thereby improving the sealing accuracy.

[0011] In a possible design, an arc-shaped groove is formed on the top surface of the base portion, and the arc-shaped groove matches the shape of the outer edge of the gate plate.

[0012] The above design increases the contact area between the support and the gate plate, makes the base and the gate plate contact closer, and distributes the supporting force more evenly, thus avoiding excessive local force caused by point contact or line contact.

[0013] In a possible design, the adjusting member is a bolt member, the top of the bolt member is pointed, and a conical groove is provided at the center of the bottom surface of the base portion, and the conical groove is adapted to the pointed position of the top of the bolt member.

[0014] With the above design, the spiral structure of the bolt can achieve fine-tuning of the support member height, meeting the demand for precise control of contact pressure under different working conditions. Moreover, by utilizing the combination of tapered grooves and sharp corners, it can have good guiding properties and force transmission efficiency, ensuring that the axial force of the bolt is effectively converted into a vertical upward force on the support member.

[0015] In a possible design, a positioning nut is further threaded onto the bolt member, and the positioning nut contacts the outer wall of the valve body.

[0016] With the above design, the positioning nut is used to lock the position of the adjusted bolt part, preventing the bolt part from loosening due to vibration and causing changes in the support height, thereby ensuring the adjustment accuracy and stability of the support mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 For this utility model Figure 1 A partial enlarged view of point A in the middle;

[0019] Figure 3 This is a schematic structural diagram of the support mechanism of the utility model;

[0020] Among them, 1. valve body; 11. bottom cavity; 12. limit groove; 2. gate; 3. valve seat; 31. sealing layer; 4. supporting mechanism; 41. supporting member; 411. base part; 4111. arc groove; 4112. conical groove; 412. guide part; 4211. hemispherical head; 4212. frustum; 42. adjusting member; 421. positioning nut. DETAILED DESCRIPTION

[0021] like Figures 1 to 3A wedge-type gate valve with an adjustable support mechanism is shown, comprising a valve body 1, a gate plate 2 arranged on the inner side of the valve body 1, and a valve seat 3 cooperating with the gate plate 2. When the valve is closed, the gate plate 2 is in a low position, and a bottom cavity 11 is formed between the bottom side of the gate plate 2 and the inner wall of the valve body 1. A sealing layer 31 is provided on the gate plate 2 and the valve seat 3, such as stainless steel welded hard alloy, and the sealing layer 31 of the gate plate 2 is wider than the sealing layer 31 of the valve seat 3. A support mechanism 4 is provided in the bottom cavity 11, and the support mechanism 4 includes a support member 41 and an adjustment member 42. The adjustment member 42 extends from the outside of the valve body 1 to the inside of the bottom cavity 11, and the height can be adjusted by operation from the outside. The support member 41 is provided above the adjustment member 42 and abuts against it to achieve a position adjustment function. The support member 41 contacts the bottom of the gate 2, providing mechanical support as it descends into position. This prevents the gate 2 from moving downward excessively due to operational inertia or mechanical clearance, thus protecting the sealing surface from excessive pressure and wear. Furthermore, the operator can adjust the height of the support member 41 from outside the valve body 1 using the adjustment member 42. This allows the operator to adjust the contact tightness between the gate 2 and the valve seat 3 according to actual operating conditions, thereby avoiding excessive contact that results in increased opening and closing resistance and increased wear, or excessive contact that results in a loose seal, thereby effectively extending the service life of the gate valve.

[0022] The support member 41 consists of two parts: a base portion 411 at the bottom and a cylindrical guide portion 412 at the top. A limiting groove 12 is defined on the inner wall of the valve body 1. The base portion 411 is a rectangular metal block that can float up and down within the limiting groove 12. The top surface of the base portion 411 abuts against the gate plate 2, while the bottom surface of the base portion 411 abuts against the adjustment member 42, allowing the base portion 411 to undergo slight displacement due to the adjustment member 42, providing support for the gate plate 2. A radially inwardly recessed side groove is defined along the outer edge of the gate plate 2, and the guide portion 412 is radially disposed along the gate plate 2. When the gate plate 2 is closed, the side groove moves downward with the gate plate 2 to cover the guide portion 412, matching its shape. As can be seen from the above, the base portion 411 primarily serves as a support, while the guide portion 412 guides and positions the gate plate 2, ensuring a stable and vertical position for improved sealing.

[0023] The guide portion 412 comprises a hemispherical head 4211 at its top and a frustum 4212 at its bottom. The hemispherical head 4211 forms a spherical contact with the bottom of the side groove, allowing for a certain contact angle deviation. The frustum 4212 forms an inclined contact with the side groove wall. Even if the gate plate 2 deviates slightly during descent, the inclined surface guides the gate plate 2 to automatically correct its position.

[0024] An arc-shaped groove 4111 is provided on the top surface of the base portion 411 . The arc-shaped groove 4111 matches the outer edge shape of the gate plate 2 . The curvature radius of the arc-shaped groove 4111 is consistent with the curvature of the outer edge of the gate plate 2 . The linear contact length between the arc-shaped groove 4111 and the outer edge of the gate plate 2 accounts for 5%-10% of the circumference of the gate plate 2 .

[0025] The adjusting member 42 is a high-precision bolt with a pointed tip. A tapered groove 4112 is defined in the center of the bottom surface of the base 411. This groove 4112 mates with the bolt tip, creating a stable tapered contact. As the pointed bolt rotates and pushes forward, the support member 41 transmits the bolt's lifting force to the gate 2, securing it in a preset position. This allows the user to manually adjust the position of the gate 2 according to actual operating conditions, precisely controlling the closing position and sealing pressure of the gate 2.

[0026] To further enhance the stability of the support mechanism 4, a positioning nut 421 is threaded onto the bolt adjustment member 42, and the positioning nut 421 abuts against the outer wall of the valve body 1. After adjustment is completed, the positioning nut 421 can be tightened to secure the valve. This prevents adjustment failure due to vibration or pressure fluctuations during operation, thereby ensuring that the support mechanism 4 is always in the set state, ensuring the adjustment accuracy and stability of the support mechanism 4.

Claims

1. A wedge-type gate valve with an adjustable support mechanism, comprising a gate plate (2), a valve body (1), and a valve seat (3); in a valve closed state, a bottom cavity (11) is formed between the bottom side of the gate plate (2) and the inner wall of the valve body (1); and a sealing layer (31) is provided on both the gate plate (2) and the valve seat (3); and characterized in that: A support mechanism (4) is provided at the bottom cavity (11), and the support mechanism (4) includes a support member (41) and an adjusting member (42). The adjusting member (42) is movably provided on the valve body (1) and penetrates the valve body (1) from the outside to the inside to the bottom cavity (11). The support member (41) is placed above the adjusting member (42) to adjust the position of the support member (41), and the support member (41) is in contact with the gate plate (2) in the closed state.

2. The wedge gate valve with an adjustable support mechanism according to claim 1, characterized in that: The support member (41) includes a base portion (411) in a lower position and a guide portion (412) in an upper position; a limiting groove (12) is provided on the inner wall of the valve body (1), and the base portion (411) can be floated in the limiting groove (12), the top surface of the base portion (411) is pressed against the gate plate (2), and the bottom surface of the base portion (411) is pressed against the adjusting member (42); a side groove is provided inwardly at the outer edge of the gate plate (2), and the guide portion (412) is provided along the radial direction of the gate plate (2). When the gate plate (2) is closed, the side groove is covered by the guide portion (412) and is adapted to the shape of the guide portion (412).

3. The wedge gate valve with an adjustable support mechanism according to claim 2, characterized in that: The guide portion (412) comprises a hemispherical head (4211) at the top and a frustum (4212) at the bottom, wherein the hemispherical head (4211) forms spherical contact with the bottom of the side groove, and the frustum (4212) forms inclined contact with the groove wall of the side groove.

4. The wedge gate valve with an adjustable support mechanism according to claim 2, characterized in that: An arc-shaped groove (4111) is provided on the top surface of the base portion (411), and the arc-shaped groove (4111) matches the shape of the outer edge of the gate plate (2).

5. The wedge gate valve with an adjustable support mechanism according to claim 2, characterized in that: The adjusting member (42) is a bolt member, the top end of which is pointed. A tapered groove (4112) is provided at the center of the bottom surface of the base portion (411), and the tapered groove (4112) is adapted to the pointed position of the top end of the bolt member.

6. The wedge gate valve with an adjustable support mechanism according to claim 5, characterized in that: A positioning nut (421) is also threaded onto the bolt member, and the positioning nut (421) is in contact with the outer wall of the valve body (1).

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