A Y-type stop valve

Abstract

This invention provides a Y-type gate valve, belonging to the field of valve sealing technology, comprising: a valve body, a valve cover, a valve seat, a valve stem, with a valve disc connected to the bottom end of the valve stem; a locking device; and a sealing structure adapted to abut against the valve seat to form a secondary seal. In use, the Y-type gate valve provided by this invention, when the valve disc abuts against the valve seat, can block the movement of fluid, forming a primary seal. When the primary seal leaks, the sealing structure tightly adheres to the valve seat, and under the combined action of the medium pressure and the valve stem closing force, a secondary seal is formed, allowing the gate valve to continue operating. This provides a double-seal function, extending the valve's service life and enabling it to meet a wider range of operating conditions.

Description

Technical Field

[0001] This invention relates to the field of valve sealing technology, specifically to a Y-type gate valve. Background Technology

[0002] Y-type gate valves are valves that open and close by having the valve stem moved up and down by a drive unit. Due to their simple and convenient operation and short stroke, they are widely used in petrochemical, chemical, and other fields.

[0003] The Y-type gate valve has a Y-shaped three-way valve body and an external self-sealing valve cover. The external seal is formed by the sealing ring at the connection between the valve cover and the valve body, as well as the packing between the valve stem and the valve cover. The internal seal is formed by the valve disc and the valve seat. In order to improve the sealing effect of the internal seal, hard alloy is usually welded to the contact area between the valve disc and the valve seat to form a sealing surface. However, when the sealing surface is damaged by erosion, the valve must be stopped and the entire valve removed, and the sealing surface between the valve disc and the valve seat must be repaired by welding. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that when the sealing surface of the gate valve is damaged, the valve can only be shut down and the entire valve can be disassembled and the sealing surface between the valve disc and the valve seat can be repaired by overlay welding, thereby providing a Y-type gate valve.

[0005] To solve the above technical problems, the present invention provides a Y-type shut-off valve, comprising:

[0006] Valve body, and valve cover mounted on top of the valve body;

[0007] The valve seat is detachably installed inside the valve body;

[0008] A valve stem is inserted through the valve cover, and a valve disc is connected to the bottom end of the valve stem. The valve disc is adapted to abut against the valve seat to form a primary seal.

[0009] A locking device is installed on the valve disc;

[0010] A sealing structure is fitted onto the valve disc and located between the locking device and the positioning ring. The sealing structure is adapted to abut against the valve seat to form a secondary seal.

[0011] Optionally, the locking device includes a positioning ring threadedly connected to the valve disc;

[0012] The sealing structure includes an elastic metal ring sleeved on the valve disc, and the elastic metal ring is located between the positioning ring and the valve seat.

[0013] The elastic metal ring extends a sealing portion toward the end face of the valve seat. When the positioning ring rotates along the valve disc, it is adapted to squeeze the elastic metal ring, so that the sealing portion abuts against the valve seat, and the sealing portion undergoes elastic deformation and is in a squeezed state.

[0014] A round nut is threaded onto the valve disc, and the round nut is located on the side of the positioning ring away from the elastic metal ring.

[0015] Optionally, the sealing portion extends toward the axial direction of the elastic metal ring.

[0016] Optionally, the portion of the valve disc that extends radially outward from the valve disc has a positioning end face;

[0017] The end face of the elastic metal ring extending from the sealing portion is adapted to abut against the positioning end face.

[0018] Optionally, a process groove is formed on the end face of the positioning ring away from the elastic metal ring.

[0019] Optionally, the locking device further includes a valve disc nut, threaded onto the valve disc;

[0020] The valve disc and valve disc nut are connected to the valve stem via the split ring.

[0021] Optionally, the valve seat is threaded onto the valve body.

[0022] Optionally, a metal sealing ring and a graphite sealing ring are provided between the valve seat and the valve body.

[0023] Optionally, the valve cover is fixedly installed on the top of the valve body by a preload ring;

[0024] The valve stem is slidably mounted on the valve cover.

[0025] Optionally, a drive device is connected to the top end of the valve stem, the drive device being adapted to drive the valve stem to rotate and move along its axis.

[0026] The technical solution of this invention has the following advantages:

[0027] 1. The Y-type gate valve provided by this invention has a valve cover mounted on the valve body, a detachable valve seat threaded inside the valve body, a valve stem passing through the valve cover, and a valve disc connected to the bottom end of the valve stem to abut against the valve seat. A sealing structure is fitted onto the valve disc. During use, when the valve disc abuts against the valve seat, it blocks the movement of fluid, forming a primary seal. When the primary seal leaks, the sealing structure tightly adheres to the valve seat, forming a secondary seal under the combined action of the medium pressure and the valve stem closing force. The gate valve can continue to operate, achieving a double-seal function, extending the valve's service life, and allowing it to meet a wider range of operating conditions.

[0028] 2. The Y-type gate valve provided by the present invention includes a locking device comprising a positioning ring and a round nut, and a sealing structure comprising an elastic metal ring. The positioning ring is threadedly connected to the valve disc, and the round nut is threadedly connected to the valve disc and presses against the positioning ring to prevent the threads of the positioning ring from loosening during long-term operation. When the positioning ring rotates on the valve disc, it can move along the valve stem. During the movement of the positioning ring, the positioning ring can squeeze the elastic metal ring, making the elastic metal ring fit tightly against the valve disc, and preventing the elastic metal ring from moving upward. When the valve stem is installed on the valve body, controlling the valve stem can make the sealing part of the elastic metal ring abut against the valve seat, and the sealing part can also undergo a certain degree of deformation to form a secondary seal and prevent fluid from flowing out.

[0029] 3. In the Y-type stop valve provided by the present invention, the sealing part of the elastic metal ring extends in the axial direction of the elastic metal ring, so as to avoid the sealing part extending radially outward and increasing the size of the elastic metal ring.

[0030] 4. The Y-type gate valve provided by the present invention has a positioning end face that cooperates with the elastic metal ring in the transverse direction of the valve disc extending from the valve stem. There is a certain elastic gap between the valve disc and the elastic metal ring in the radial direction. The end of the elastic metal ring with the sealing part is suitable for abutting against the upper surface of the valve seat. After the elastic metal ring is squeezed to the positioning end face by the positioning ring, the valve stem is installed. At this time, the driving device controls the valve stem so that the sealing part of the elastic metal ring abuts against the valve seat, and the sealing part undergoes a certain elastic deformation to form a secondary seal.

[0031] 5. The Y-type stop valve provided by the present invention has a process groove on the end face of the positioning ring away from the elastic metal ring, and the operator can rotate the positioning ring by inserting a tool into the process groove.

[0032] 6. The Y-type stop valve provided by the present invention further includes a split ring in the locking device, and the valve disc and valve disc nut are connected to the valve stem through the split ring.

[0033] 7. The Y-type gate valve provided by the present invention has a valve seat that is threaded onto the valve body, making it easy to disassemble and operate.

[0034] 8. The Y-type gate valve provided by the present invention has a metal sealing ring and a graphite sealing ring between the valve seat and the valve body to ensure good sealing between the valve seat and the valve body.

[0035] 9. The Y-type gate valve provided by the present invention has a valve cover fixedly installed on the valve body by a preload ring for easy disassembly. The valve stem slides on the valve cover, and the top of the valve stem is connected to a driving device that can drive the valve stem to move along its axis to realize the opening and closing of the gate valve. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 A first-angle cross-sectional view of a Y-type shut-off valve provided in an embodiment of the present invention;

[0038] Figure 2 A second-angle cross-sectional view of the Y-type shut-off valve provided in an embodiment of the present invention;

[0039] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0040] Figure 4 for Figure 3 Enlarged view at point B in the middle;

[0041] Figure 5 for Figure 3 Enlarged view of point C.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Valve body; 2. Preload ring; 3. Valve disc nut; 4. Valve cover; 5. Valve stem; 6. Bracket; 7. Drive unit; 8. Valve disc; 9. Positioning ring; 10. Valve seat; 11. Elastic metal ring; 12. Sealing part; 13. Metal sealing ring; 14. Graphite sealing ring; 15. Round nut; 16. Split ring. Detailed Implementation

[0044] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] Example

[0049] This embodiment provides a specific implementation method for a Y-type gate valve, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a valve cover 4 is installed on the top of the valve body 1, the valve stem 5 passes through the valve cover 4, a detachable valve seat 10 is installed inside the valve body 1, and a valve disc 8 that can abut against the valve seat 10 is connected to the bottom end of the valve stem 5; a sealing structure is fitted on the valve disc 8. During operation, the Y-type gate valve, by moving the valve stem 5 to bring the valve disc 8 into contact with the valve seat 10, blocks the flow of fluid, forming a primary seal. If the primary seal leaks, the valve seat 10 and valve disc 8 can be replaced on-site without disassembling the entire gate valve for replacement. When no spare parts are available on-site, the valve cover 4, valve stem 5, bracket 6, and drive device 7 can be removed. By controlling the locking device, the sealing structure is tightly fitted onto the valve disc 8. After the valve stem 5 and valve cover 4 are installed, the sealing structure abuts against the valve seat 10, forming a secondary seal. The gate valve can continue to operate. After operation, the valve seat 10 and valve disc 8 can be replaced, avoiding prolonged delays due to seal leaks and allowing the gate valve to meet a wider range of operating conditions.

[0050] like Figure 3 and Figure 4As shown, the locking device includes a positioning ring 9 and a round nut 15, and the sealing structure includes an elastic metal ring 11. The positioning ring 9 is threadedly connected to the valve disc 8, and the round nut 15 is threadedly connected to the valve disc 8 and presses against the positioning ring 9. When the positioning ring 9 rotates on the valve stem 5, it can move along the valve stem 5. During the movement of the positioning ring 9, the positioning ring 9 can lock the elastic metal ring 11 and tighten the round nut 15 at the same time, so that the elastic metal ring 11 is connected to the valve disc 8. At this time, after the valve stem 5 is installed, the sealing part 12 of the elastic metal ring 11 abuts against the valve seat 10, and the sealing part 12 undergoes elastic deformation and is in a squeezed state, forming a secondary seal to prevent fluid from flowing out.

[0051] Specifically, the portion of the valve disc 8 that extends radially out of the valve stem 5 has a positioning end face. The end of the elastic metal ring 11 with the sealing part 12 is adapted to abut against the positioning end face. By controlling the locking device, the lower end face of the elastic metal ring 11 can abut against the positioning end face, and the elastic metal ring 11 can be prevented from moving upward. When installing the valve stem 5, the sealing part 12 of the elastic metal ring 11 can abut against the valve seat 10, and the sealing part 12 undergoes a certain degree of elastic deformation to form a secondary seal.

[0052] Specifically, the sealing portion 12 of the elastic metal ring 11 extends toward the axial direction of the elastic metal ring 11 to prevent the sealing portion 12 from extending radially outward and increasing the size of the elastic metal ring 11.

[0053] As an alternative implementation, the locking device can also be a locking ring, as long as it can lock the elastic metal ring 11.

[0054] In this embodiment, a process groove is provided on the end face of the positioning ring 9 away from the elastic metal ring 11, that is, a process groove is provided on the upper end face of the positioning ring 9, and the operator can rotate the positioning ring 9 by inserting a tool into the process groove.

[0055] In this embodiment, the locking device also includes a valve disc nut 3, which is disposed above the valve disc 8. The split ring 16 is sleeved on the valve stem 5, and the valve disc nut 3 is threadedly locked to the valve disc 8. The valve disc nut 3 can further tighten the split ring 16, thereby organically connecting the valve disc 8, the valve disc nut 3, the split ring 16, and the valve stem 5 together.

[0056] As an alternative implementation, the sealing structure can also be a non-metallic elastic sealing ring. For example, under low-pressure conditions, where the pressure is relatively small, a non-metallic elastic sealing ring such as a rubber sealing ring can also achieve the sealing effect.

[0057] like Figure 5 As shown, the part protruding from the valve body 1 is provided with external threads, and the valve seat 10 is provided with internal threads. The valve seat 10 is installed on the valve body 1 by the threads, which makes disassembly convenient and easy for operators to operate.

[0058] A metal sealing ring 13 and a graphite sealing ring 14 are provided between the valve seat 10 and the valve body 1 to ensure good sealing between the valve seat 10 and the valve body 1.

[0059] In this embodiment, the valve cover 4 is fixedly installed on the valve body 1 by the preload ring 2 for easy disassembly. The valve stem 5 slides on the valve cover 4, and the top of the valve stem 5 is connected to a drive device 7, which can drive the valve stem 5 to move along its axis to realize the opening and closing of the shut-off valve.

[0060] Specifically, the drive device 7 is a worm gear structure, externally connected to a handwheel. The operator transmits power to the valve stem 5 through the handwheel, enabling the valve stem 5 to move. The worm gear can adjust the rotational force into a linear force along the center of the valve body.

[0061] As an alternative implementation, the drive device 7 can also be configured as a pneumatic or electric device, which directly drives the valve stem 5 to move via a cylinder or electric actuator.

[0062] In this embodiment, a bracket 6 is provided on the outside of the valve cover 4, the drive device 7 is mounted on the bracket 6, and the valve stem 5 passes through the bracket 6 and is connected to the drive device 7.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A Y-type shut-off valve, characterized in that, include: Valve body (1), and valve cover (4) mounted on top of the valve body (1); Valve seat (10) is detachably installed inside the valve body (1); A valve stem (5) is inserted through the valve cover (4), and a valve disc (8) is connected to the bottom end of the valve stem (5). The valve disc (8) is adapted to abut against the valve seat (10) to form a primary seal. A locking device is installed on the valve disc (8); A sealing structure is sleeved on the valve disc (8) and located between the locking device and the positioning ring (9). The sealing structure is adapted to abut against the valve seat (10) to form a secondary seal. The locking device includes a positioning ring (9) threaded onto the valve disc (8); the sealing structure includes an elastic metal ring (11) sleeved on the valve disc (8), the elastic metal ring (11) being located between the positioning ring (9) and the valve seat (10); the elastic metal ring (11) has a sealing portion (12) extending from its end face toward the valve seat (10), the positioning ring (9) being adapted to compress the elastic metal ring (11) when rotating along the valve disc (8), causing the sealing portion (12) to abut against the valve seat (10), and the sealing portion (12) undergoing elastic deformation and being in a compressed state; the sealing portion (12) extends toward the axial direction of the elastic metal ring (11).

2. The Y-type shut-off valve according to claim 1, characterized in that, The locking device further includes: A round nut (15) is threaded onto the valve disc (8), and the round nut is located on the side of the positioning ring (9) away from the elastic metal ring (11).

3. The Y-type shut-off valve according to claim 2, characterized in that, The portion of the valve disc (8) that extends radially out of the valve disc (8) has a positioning end face; The end face of the elastic metal ring (11) extending from the sealing part (12) is adapted to abut against the positioning end face.

4. The Y-type shut-off valve according to claim 2, characterized in that, The positioning ring (9) has a process groove on its end face away from the elastic metal ring (11).

5. The Y-type shut-off valve according to claim 2, characterized in that, The locking device also includes a valve disc nut (3), which is threaded onto the valve disc (8); The valve disc (8) and valve disc nut (3) are connected to the valve stem (5) via the split ring (16).

6. The Y-type shut-off valve according to any one of claims 1-5, characterized in that, The valve seat (10) is threaded onto the valve body (1).

7. The Y-type shut-off valve according to claim 6, characterized in that, A metal sealing ring (13) and a graphite sealing ring (14) are provided between the valve seat (10) and the valve body (1).

8. The Y-type shut-off valve according to any one of claims 1-5, characterized in that, The valve cover (4) is fixedly installed on the top of the valve body (1) by a preload ring (2); The valve stem (5) is slidably mounted on the valve cover (4).

9. The Y-type shut-off valve according to any one of claims 1-5, characterized in that, The top end of the valve stem (5) is connected to a drive device (7), which is adapted to drive the valve stem (5) to rotate and move along its axis.

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