Lever type two-way automatic pressure release valve

Abstract

The lever type two-way automatic pressure release valve comprises a valve body with a valve cavity, the valve body is provided with a first through hole, a second through hole and a third through hole which are communicated with the valve cavity, the first through hole and the second through hole are used for being communicated with pipelines at the two ends of a gate valve respectively, and the third through hole is used for being communicated with a middle cavity of the gate valve; a first valve element, a second valve element and a transmission assembly are arranged in the valve cavity, and the first valve element and the second valve element are movably connected to the first through hole and the second through hole correspondingly and used for opening or closing the first through hole and the second through hole correspondingly. The transmission assembly is connected with the first valve element and the second valve element and used for driving the first valve element and the second valve element to synchronously and oppositely move. The first valve element and the second valve element can be automatically closed and opened according to the pressure condition of a system pipeline, meanwhile, the first valve element and the second valve element are connected through the transmission assembly, it is guaranteed that when one valve element is opened, the other valve element is closed inevitably, and the safety of the system is guaranteed while bidirectional pressure relief is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bypass valves, in particular to a lever-type two-way automatic pressure relief valve. Background Art

[0002] The widespread use of gate valves in the industrial sector is primarily due to their four significant advantages: They offer excellent sealing performance, with a flat, ground surface between the gate disc and seat ensuring a stable and reliable seal; their simple structure reduces maintenance and costs while also facilitating easy operation; and their smooth flow when open reduces fluid resistance, improving transmission efficiency, and conserving energy. These unique structural designs and high-performance performance have led to their widespread use in a variety of industries, including chemical, petroleum, pharmaceutical, papermaking, and food, making them indispensable fluid control devices in the industrial sector.

[0003] The boiler effect of a gate valve is essentially a temperature conduction phenomenon. The gate valve's central cavity is considered a closed space. High-temperature steam on the valve's inlet and outlet transfers heat to the central cavity, continuously heating the water inside and generating high-pressure steam. This can affect the valve's opening and even damage it, leading to accidents.

[0004] Because gate valves can present various problems due to pressure and temperature imbalances, bypass valves are often used in engineering to address these issues. Common bypass structures involve drilling a hole in one side of the gate or placing a small stop valve between the high-pressure side and the center chamber. This conventional bypass valve structure is only suitable for applications where pipeline pressure is consistently flowing in one direction. When pipeline pressure fluctuates, bidirectional pressure relief is required. The current solution involves installing a sliding valve, but this structure is complex and difficult to maintain, making it unsuitable for large-scale use. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art and provide a lever-type two-way automatic pressure relief valve which has a simple structure, reduced cost and can relieve pressure in both directions.

[0006] The technical solution of the present invention is to provide a lever-type two-way automatic pressure relief valve having the following structure: comprising a valve body having a valve cavity, the valve body being provided with a first through hole, a second through hole, and a third through hole communicating with the valve cavity, the first through hole and the second through hole being respectively used to communicate with pipelines at both ends of the gate valve, and the third through hole being used to communicate with the central cavity of the gate valve; A first valve core, a second valve core and a transmission assembly are provided in the valve cavity. The first valve core and the second valve core are movably connected to the first through hole and the second through hole respectively, and are used to open or close the corresponding first through hole and the second through hole; the transmission assembly is connected to the first valve core and the second valve core, and is used to drive the first valve core and the second valve core to move synchronously and oppositely; when the first valve core opens the first through hole, the transmission assembly drives the second valve core to close the second through hole; when the second valve core opens the second through hole, the transmission assembly drives the first valve core to close the first through hole.

[0007] After adopting the above structure, the lever-type two-way automatic pressure relief valve of the present invention has the following advantages compared with the prior art: The first and second valve cores of the present invention can automatically close and open based on the system pipeline pressure. They are connected by a transmission assembly, ensuring that when one valve core opens, the other is automatically closed, achieving bidirectional pressure relief while ensuring system safety. The pressure relief valve of the present invention utilizes the same main structure as a conventional bypass valve, resulting in a simpler manufacturing process and significantly lower costs than a sliding valve structure.

[0008] Preferably, the transmission assembly includes a support and a lever; the support is fixedly arranged between the first valve core and the second valve core, and is arranged parallel to the first valve core and the second valve core; the middle part of the lever is rotatably connected to the support, and the two ends of the lever are movably connected to the first valve core and the second valve core respectively.

[0009] When system pressure pushes the first valve core to open the first through-hole, the first valve core, during its movement, simultaneously drives the second valve core via the lever to close the second through-hole. Similarly, when system pressure pushes the second valve core to open the second through-hole, the second valve core, during its movement, simultaneously drives the first valve core via the lever to close the first through-hole. The first and second valve cores of the present invention are driven by a lever structure, which is not only simple and reliable, but also enables automatic two-way pressure relief.

[0010] Preferably, the upper ends of the first and second valve cores are each provided with a slot for inserting the end of the lever, with the slot gradually increasing in width from the middle toward the ends. This arrangement facilitates coupling of the lever to the first and second valve cores while also avoiding the drawback of a sliding valve structure with dual sealing surfaces directly connected, which can only be arranged horizontally due to gravity.

[0011] Preferably, guide grooves are provided at the inner openings of the first and second through holes, and radially extending guide portions are provided on the outer peripheral walls of the first and second valve cores, the guide portions being slidably connected within the corresponding guide grooves. The cooperation between the guide portions and the guide grooves allows the first and second valve cores to move only in their axial directions, thus preventing deviation.

[0012] Preferably, the lower ends of the first valve core and the second valve core are provided with sealing portions, and the sealing portions are used for sealingly inserting into the corresponding first through hole and second through hole.

[0013] Preferably, the guide portion is provided with a plurality of flow holes evenly spaced along its circumference and penetrating its upper and lower end surfaces. When the valve core closes the corresponding through hole, water in the guide groove can be discharged from the flow holes to avoid the situation where the valve cannot be closed.

[0014] Preferably, the valve body includes a valve seat and a valve cover. The valve seat is provided with a concave cavity with an open top. The valve cover is detachably connected to the top of the valve seat by bolts and encloses the valve seat to form the valve cavity. Splitting the valve body into the valve seat and the valve cover facilitates installation of the first valve core, the second valve core, and the transmission assembly within the valve cavity.

[0015] Preferably, an annular groove is provided at the upper opening of the cavity, and a sealing ring is installed in the annular groove. The sealing ring can improve the sealing performance of the valve seat and the valve cover to avoid leakage.

[0016] Preferably, a positioning groove is provided in the middle of the lower end surface of the valve cover, and the top of the support extends upward to form a positioning column matching the positioning groove, and the positioning column is inserted into the positioning groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a half-section view of the present invention.

[0019] Figure 3 It is a half-section view from another viewing direction of the present invention.

[0020] Figure 4 This is a schematic structural diagram of the first through hole of the present invention under pressure.

[0021] Figure 5 It is a schematic structural diagram of the second through hole under pressure state of the present invention.

[0022] Figure 6 It is a structural schematic diagram of the valve core in the present invention.

[0023] Figure 7 It is a half-section view of the valve core in the present invention.

[0024] Description of reference numerals: 1. Valve body, 11. Valve chamber, 12. First through hole, 13. Second through hole, 14. Third through hole, 15. Guide groove, 16. Valve seat, 17. Valve cover, 171. Positioning groove, 18. Sealing ring, 2. First valve core, 21. Slot, 22. Guide part, 23. Sealing part, 24. Flow hole, 3. Second valve core, 4. Transmission assembly, 41. Support, 411. Positioning column, 42. Lever, 5. Gate valve. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. At the same time, the terms "first", "second", etc. are only used to distinguish the names of the components, and have no primary or secondary relationship, and therefore cannot be understood as a limitation on the present invention.

[0027] like Figure 1 、 Figure 2 and Figure 3 As shown; The present invention discloses a lever-type two-way automatic pressure relief valve: it includes a valve body 1 with a valve cavity 11, and the valve body 1 is provided with a first through hole 12, a second through hole 13 and a third through hole 14 connected to the valve cavity 11. The first through hole 12 and the second through hole 13 are respectively connected to the pipelines at both ends of the gate valve 5 through connecting pipes, and the third through hole 14 is connected to the middle cavity of the gate valve 5 through the connecting pipe.

[0028] A first valve core 2, a second valve core 3, and a transmission assembly 4 are disposed within the valve chamber 11. The first and second valve cores 2 and 3 have identical structures. The first and second valve cores 2 and 3 are movably connected to the first and second through-holes 12 and 13, respectively, for opening or closing the corresponding first and second through-holes 12 and 13. The transmission assembly 4 is connected to the first and second valve cores 2 and 3 to drive the first and second valve cores 2 and 3 to move synchronously in opposite directions. When the first valve core 2 opens the first through-hole 12, the transmission assembly 4 drives the second valve core 3 to close the second through-hole 13. When the second valve core 3 opens the second through-hole 13, the transmission assembly 4 drives the first valve core 2 to close the first through-hole 12.

[0029] like Figure 2 and Figure 3As shown, the transmission assembly 4 includes a support 41 and a lever 42; the support 41 is fixedly arranged between the first valve core 2 and the second valve core 3, and is arranged parallel to the first valve core 2 and the second valve core 3; the middle part of the lever 42 is rotatably connected to the support 41, and the two ends of the lever 42 are movably connected to the first valve core 2 and the second valve core 3 respectively.

[0030] like Figure 4 and Figure 5 As shown, when the system pipeline pressure pushes the first valve core 2 to open the first through hole 12, the first valve core 2, during its movement, synchronously drives the second valve core 3 to close the second through hole 13 via the lever 42. Similarly, when the system pipeline pressure pushes the second valve core 3 to open the second through hole 13, the second valve core 3, during its movement, synchronously drives the first valve core 2 to close the first through hole 12 via the lever 42. The first and second valve cores 2 and 3 of the present invention are driven by a lever structure, which is not only simple and reliable, but also can achieve automatic two-way pressure relief.

[0031] like Figure 6 and Figure 7 As shown, the upper ends of the first and second valve cores 2, 3 are each provided with a slot 21 for inserting the end of a lever 42. The width of the slot 21 gradually increases from the middle toward the ends. This facilitates coupling of the lever 42 with the first and second valve cores 2, 3, while also ensuring point contact between the lever 42 and the first and second valve cores 2, 3, improving the accuracy of the operation. Furthermore, transmission via the lever 42 avoids the drawback of a sliding valve structure with two directly connected sealing surfaces, which can only be arranged horizontally due to gravity.

[0032] In the present invention, guide grooves 15 are provided at the inner end openings of the first through hole 12 and the second through hole 13, and radially extending guide portions 22 are provided on the outer peripheral walls of the first valve core 2 and the second valve core 3. The guide portions 22 are slidably connected in the corresponding guide grooves 15. Through the cooperation between the guide portions 22 and the guide grooves 15, the first valve core 2 and the second valve core 3 can only move along their axial directions, avoiding deviation and avoiding the occurrence of the valve core getting stuck after being pulled out and the failure of being unable to be inserted.

[0033] The lower ends of the first valve core 2 and the second valve core 3 are provided with a sealing portion 23, which can be inserted into the corresponding first through hole 12 and the second through hole 13 to seal and close the first through hole 12 or the second through hole 13. The sealing portion 23 is subjected to a surfacing treatment to ensure its service life.

[0034] The guide portion 22 is also provided with a plurality of flow holes 24 evenly spaced along its circumference and penetrating its upper and lower end surfaces. When the valve core closes the corresponding through hole, the water in the guide groove 15 can be discharged from the flow hole 24 to avoid the situation where it cannot be closed.

[0035] For example Figure 2-Figure 5As shown, the valve body 1 includes a valve seat 16 and a valve cover 17. The valve seat 16 is provided with a concave cavity with an open top. The valve cover 17 is detachably connected to the top of the valve seat 16 by bolts and encloses the valve seat 16 to form the valve cavity 11. By separating the valve body 1 into the valve seat 16 and the valve cover 17, the installation of the first valve core 2, the second valve core 3, and the transmission assembly 4 in the valve cavity 11 can be facilitated, as well as subsequent disassembly and repair.

[0036] An annular groove is provided at the upper opening of the cavity, and a sealing ring 18 is installed in the annular groove to improve the sealing between the valve seat 16 and the valve cover 17 to avoid leakage.

[0037] A positioning groove 171 is provided in the middle of the lower end surface of the valve cover 17, and the top of the support 41 extends upward to form a positioning column 411 that matches the positioning groove 171. When the valve cover 17 is connected to the valve seat 16, the positioning column 411 will be inserted into the positioning groove 171 to fix the support 41.

[0038] Compared to existing pressure relief valves, the first and second valve cores 2 and 3 of the lever-type, two-way automatic pressure relief valve of the present invention can automatically close and open according to the system pipeline pressure. Furthermore, the first and second valve cores 2 and 3 are coupled via a lever 42, ensuring that when one valve core opens, the other is necessarily closed, thus achieving two-way pressure relief while ensuring system safety. The pressure relief valve of the present invention utilizes the same main structure as a conventional bypass valve, simplifies the manufacturing process, and significantly reduces costs compared to a sliding valve structure.

[0039] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A lever-type two-way automatic pressure relief valve, comprising a valve body (1) having a valve cavity (11), characterized in that: The valve body (1) is provided with a first through hole (12), a second through hole (13) and a third through hole (14) which are in communication with the valve cavity (11); the first through hole (12) and the second through hole (13) are respectively used for communicating with the pipes at both ends of the gate valve (5); and the third through hole (14) is used for communicating with the middle cavity of the gate valve (5); A first valve core (2), a second valve core (3) and a transmission assembly (4) are provided in the valve cavity (11); the first valve core (2) and the second valve core (3) are movably connected to the first through hole (12) and the second through hole (13) respectively, and are used to open or close the corresponding first through hole (12) and the second through hole (13); the transmission assembly (4) is connected to the first valve core (2) and the second valve core (3), and is used to drive the first valve core (2) and the second valve core (3) to move synchronously and oppositely; when the first valve core (2) opens the first through hole (12), the transmission assembly (4) drives the second valve core (3) to close the second through hole (13); when the second valve core (3) opens the second through hole (13), the transmission assembly (4) drives the first valve core (2) to close the first through hole (12).

2. The lever-type two-way automatic pressure relief valve according to claim 1, characterized in that: The transmission assembly (4) includes a support (41) and a lever (42); the support (41) is fixedly arranged between the first valve core (2) and the second valve core (3), and is arranged parallel to the first valve core (2) and the second valve core (3); the middle part of the lever (42) is rotatably connected to the support (41), and the two ends of the lever (42) are movably connected to the first valve core (2) and the second valve core (3).

3. The lever-type two-way automatic pressure relief valve according to claim 2, characterized in that: The upper ends of the first valve core (2) and the second valve core (3) are each provided with a slot (21) for inserting the end of the lever (42), and the width of the slot (21) gradually increases from the middle to both ends.

4. The lever-type two-way automatic pressure relief valve according to claim 3, characterized in that: The inner end openings of the first through hole (12) and the second through hole (13) are both provided with guide grooves (15), and the outer peripheral walls of the first valve core (2) and the second valve core (3) are provided with radially extending guide portions (22), and the guide portions (22) are slidably connected in the corresponding guide grooves (15).

5. The lever-type two-way automatic pressure relief valve according to claim 4, characterized in that: The lower ends of the first valve core (2) and the second valve core (3) are provided with sealing portions (23), and the sealing portions (23) are used for sealingly inserting into the corresponding first through hole (12) and second through hole (13).

6. The lever-type two-way automatic pressure relief valve according to claim 5, characterized in that: The guide portion (22) is provided with a plurality of flow holes (24) evenly spaced along its circumference and penetrating its upper and lower end surfaces.

7. The lever-type two-way automatic pressure relief valve according to claim 1, characterized in that: The valve body (1) comprises a valve seat (16) and a valve cover (17), wherein the valve seat (16) is provided with a concave cavity with an open top end, and the valve cover (17) is detachably connected to the top of the valve seat (16) by bolts, and encloses the valve seat (16) to form the valve cavity (11).

8. The lever-type two-way automatic pressure relief valve according to claim 7, characterized in that: An annular groove is provided at the upper opening of the cavity, and a sealing ring (18) is installed in the annular groove.

9. The lever-type two-way automatic pressure relief valve according to claim 8, characterized in that: A positioning groove (171) is provided in the middle of the lower end surface of the valve cover (17), and the top of the support (41) extends upward to form a positioning column (411) matching the positioning groove (171), and the positioning column (411) is inserted into the positioning groove (171).

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