Poppet valve with pressure relief

Abstract

This invention discloses a lift valve with pressure relief function, comprising a valve body assembly, a valve core assembly, and a check valve assembly. The valve body assembly includes an inlet channel, an outlet channel, a branch channel, a pressure relief channel, a first valve port, and a second valve port. The inner cavity of the valve body assembly includes an upper valve cavity and a main valve cavity. The upper valve cavity is located above the first valve port, and the main valve cavity is located below the first valve port. The branch channel connects to the upper valve cavity, and the inlet channel connects to the main valve cavity. The valve core assembly includes a first sealing part and a second sealing part. The valve core assembly can move longitudinally along the valve body assembly to close the first valve port with the first sealing part, or to close the second valve port with the second sealing part. When the first valve port is closed, the upper valve cavity and the main valve cavity are not connected. The check valve assembly controls the opening and closing of the pressure relief channel. When the second valve port is closed and the lift valve is under pressure overload, the check valve assembly opens the pressure relief channel, and the main valve cavity can connect to the outlet channel through the pressure relief channel.

Description

Technical Field

[0001] This invention relates to the field of flow path control technology for refrigeration systems, and in particular to a lift valve with pressure relief function. Background Technology

[0002] In the background technology, control valves in refrigeration pipelines are connected in parallel to achieve different functions. For example, in high-pressure pipelines, angle valves are required to safely install pressure gauges, and a one-way valve is used to bypass and relieve pressure when the shut-off valve is closed, preventing excessive pressure in the sealed parts of the system from damaging components. However, parallel valve components and pipelines are generally large and complex in structure, and due to the large number of connection interfaces, there is a risk of leakage due to poor welding. Summary of the Invention

[0003] To address the problems in the background art, this invention proposes a lift valve with pressure relief function, comprising a valve body assembly, a valve core assembly, and a check valve assembly. The valve body assembly includes an inlet channel, an outlet channel, a branch channel, a pressure relief channel, a first valve port, and a second valve port. The inner cavity of the valve body assembly includes an upper valve chamber and a main valve chamber. The upper valve chamber is located above the first valve port, and the main valve chamber is located below the first valve port. The branch channel connects to the upper valve chamber, and the inlet channel connects to the main valve chamber. The valve core assembly includes a first sealing part and a second sealing part. The valve core assembly can move longitudinally along the valve body assembly to close the first valve port with the first sealing part, or to close the second valve port with the second sealing part. When the first valve port is closed, the upper valve chamber and the main valve chamber are not connected. The check valve assembly controls the opening and closing of the pressure relief channel. When the second valve port is closed and the lift valve is under pressure overload, the check valve assembly opens the pressure relief channel, allowing the main valve chamber to connect to the outlet channel through the pressure relief channel.

[0004] This invention sets up branch channels, pressure relief channels, and check valve components in the same valve body, and uses the same valve core to control the opening and closing of the first valve port and the second valve port. This allows the lift valve with pressure relief function to not only shut off, but also to open the pressure relief channel through the check valve component to relieve pressure under pressure overload conditions. It can also safely connect to functional devices such as pressure gauges through the branch channels. Attached Figure Description

[0005] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings will be briefly described below. The drawings are merely illustrative of some embodiments of the present invention and are not intended to limit the invention to all embodiments. In the drawings:

[0006] Figure 1 This is an overall schematic diagram of the lifting valve with pressure relief function of the present invention;

[0007] Figure 2 This is a cross-sectional schematic diagram of the lifting valve with pressure relief function of the present invention;

[0008] Figure 3 This is a cross-sectional schematic diagram of the lifting valve with pressure relief function of the present invention from another perspective;

[0009] Figure 4 This is a cross-sectional schematic diagram of the lifting valve with pressure relief function of the present invention in the open state;

[0010] Figure 5 This is a schematic diagram of the inlet and outlet channels of the lifting valve with pressure relief function of the present invention;

[0011] Figure 6 This is a schematic diagram of the gate structure in this invention;

[0012] Figure 7 This is a schematic diagram of the flow guide and annular seal in this invention;

[0013] Figure 8 This is a partial cross-sectional schematic diagram of the lifting valve with pressure relief function of the present invention;

[0014] Figure 9 for Figure 8 An enlarged view of position A in the middle;

[0015] Figure 10 for Figure 8 An enlarged view of position B in the middle;

[0016] Figure 11 This is an overall schematic diagram of the lifting valve with pressure relief function of the present invention connected to a pressure gauge;

[0017] Figure 12 This is a cross-sectional schematic diagram of the pressure relief valve of the present invention in the pressure relief state;

[0018] Figure 13 for Figure 12 A magnified view of the area at position C.

[0019] In the picture:

[0020] 1. Valve body assembly; 10. Main valve body; 100. Inlet port; 101. Upper valve chamber; 1011. Valve cap chamber; 102. Main valve chamber; 1021. Lower receiving chamber; 103. First valve port; 104. Second valve port; 105. Third valve port; 11. First port; 111. First valve cap; 12. Mounting part; 120. Branch passage; 1201. Branch port; 121. Second valve cap; 122. Compression nut; 123. External connecting pipe; 124. Mounting port; 13. Pressure relief part; 130. Pressure relief passage; 1301. First passage; 1302. Second passage; 131. Mounting hole; 132. Third valve cap; 14. Second port; 141. Fourth valve cap; 15. Inlet passage; 1 51. Flow guide; 1510. First flow guide channel; 1511. Second flow guide channel; 16. Outlet channel; 161. Annular seal; 17. Threaded mating part; 18. Valve seat; 2. Valve core assembly; 21. Valve stem; 211. Threaded section; 212. First sealing part; 213. Insertion section; 2131. Annular groove; 22. Gate; 221. Sealing section; 2211. Second sealing part; 2212. Third sealing part; 222. Through hole; 223. Positioning hole; 224. Insertion hole; 23. Positioning pin; 3. Check assembly; 31. Check spring; 32. Check valve core; 321. End face; 322. Side wall face; 33. Positioning bolt; 4. Inlet pipe; 5. Outlet pipe; 6. Pressure gauge. Detailed Implementation

[0021] The present invention will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0022] In the accompanying drawings, shapes and dimensions may be enlarged for clarity, and the same reference numerals will be used in all figures to indicate the same or similar parts.

[0023] In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, and lower are defined relative to the structure shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other orientations should not be interpreted as restrictive terms.

[0024] To achieve the above-mentioned objectives and other advantages of the present invention, the present invention provides the following technical solutions:

[0025] This invention provides a lift valve with pressure relief function (hereinafter referred to as "lift valve" for convenience of description), such as... Figures 1 to 13 As shown, the lift valve includes a valve body assembly 1, a valve core assembly 2, a check assembly 3, an inlet pipe 4, and an outlet pipe 5.

[0026] Specifically, such as Figure 1 , Figure 2 , Figure 3 As shown, the valve body assembly 1 includes a first valve port 103, a second valve port 104, a mounting part 12, a pressure relief part 13, an inlet channel 15, and an outlet channel 16, as shown. Figure 5 As shown, along the longitudinal direction of the valve body assembly 1, the inner cavity of the valve body assembly 1 includes an upper valve cavity 101 and a main valve cavity 102. The valve body assembly 1 includes a small-diameter section and a large-diameter section. The upper valve cavity 101 is located in the inner cavity of the valve body corresponding to the small-diameter section, and the main valve cavity 102 is located in the inner cavity of the valve body corresponding to the large-diameter section. The small-diameter section and the large-diameter section are connected by a step, and the first valve port 103 is located at the step position. The inlet channel 15 and the outlet channel 16 communicate with the main valve cavity 102, and the outlet channel 16 communicates with the main valve cavity at the second valve port 104. The mounting part 12 is located in the small-diameter section, and the mounting part 12 includes a branch channel 120, which communicates with the upper valve cavity 101.

[0027] The valve core assembly 2 cooperates with the valve body assembly 1 and can reciprocate along the longitudinal direction of the valve body assembly 1. The valve core assembly 2 includes a first sealing part 212 and a second sealing part 2211. When the valve core assembly 2 moves upward, the first sealing part 212 can abut against and block the first valve port 103, separating the upper valve chamber 101 from the main valve chamber 102. When the valve core assembly 2 moves downward, the second sealing part 2211 can block the second valve port 104, separating the main valve chamber 102 from the outlet channel 16.

[0028] like Figure 5 , Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown, when the first valve port 103 is closed, the upper valve chamber 101 is disconnected from the main valve chamber 102. At this time, the branch channel 120 is opened. One end of the branch channel 120 is connected to the upper valve chamber 101, and the other end can be connected to the external environment. The upper valve chamber 101 can be depressurized through the branch channel 120 to safely connect to testing tools such as the pressure gauge 6 without being interfered with by the high-pressure gas inside the main valve chamber 102. After the connection is completed, the valve core assembly 2 moves down and opens the first valve port 103, so the pressure gauge 6 can measure the pressure of the fluid inside the valve body. On the other hand, the branch channel 120 can also be connected to a vacuuming or inflation tool. After the connection is completed, the valve core assembly 2 moves down, the first valve port 103 opens, and the second valve port 104 closes. Then, the pipeline before the outlet channel 16 can be evacuated or pressurized through the branch channel 120.

[0029] like Figure 2 , Figure 12As shown, the pressure relief section 13 includes a pressure relief channel 130. The check assembly 3 controls the opening and closing of the pressure relief channel 130. When the second valve port 104 is closed and the lift valve is under pressure overload, the check assembly 3 opens the pressure relief channel 130, allowing the main valve chamber 102 to communicate with the outlet channel 6 through the pressure relief channel 130, thus relieving pressure on the fluid within the main valve chamber 102. Specifically, the pressure relief channel 130 refers to a bypass flow path that connects the main valve chamber 102 to the outlet channel 16 without passing through the second valve port 104. The pressure relief channel 130 has a third valve port 105, and the check assembly 3 controls the opening and closing of the pressure relief channel 130 by blocking or opening the third valve port 105. Optionally, depending on the blocking position of the check assembly 3, the check assembly 3 can be located inside the pressure relief channel 130 or at the port of the pressure relief channel 130. In one embodiment, the check assembly 3 is at least partially located inside the pressure relief channel 130 to close the pressure relief channel 130. When the second valve port 104 is closed, and the fluid pressure inside the main valve chamber 102 is too high, the check valve assembly 3 moves out of the pressure relief channel 130 under the action of fluid pressure, opening the pressure relief channel 130 and connecting the main valve chamber 102 with the outlet channel 16. As the fluid in the main valve chamber 102 decreases, the check valve assembly 3 returns to its original position, closing the pressure relief channel 130 again, ensuring one-way communication between the main valve chamber 102 and the outlet channel 16, and preventing backflow of fluid in the outlet channel 16 through the pressure relief channel 130.

[0030] Through the aforementioned structural design, the lift valve in this invention, in addition to fulfilling the shut-off function of a lift valve, can also perform functions similar to those of an angle valve for connecting external components and for relieving pressure. These functions are achieved through the same valve body assembly 1 and the same valve core assembly 2. Compared to control valve pipelines in the prior art, the structure is more centralized, the operation is simpler and more efficient, and there are fewer connecting pipelines, effectively preventing internal fluid leakage due to pipeline welding failure.

[0031] Specifically, in one embodiment, such as Figure 4 , Figure 12 , Figure 13As shown, the pressure relief section 13 includes a third valve port 105, a pressure relief channel 130, and a mounting channel 131. The mounting channel 131 communicates with the pressure relief channel 130, and the check assembly 3 is installed inside the mounting channel 131. The check assembly 3 includes a check valve core 32, a check spring 31, and a positioning bolt 33. The positioning bolt 33 is fixedly connected to the inner wall of the mounting channel 131, and a sealing ring is provided at the connection position. The outward end of the positioning bolt 33 is blocked by the third valve cap 132, which is threaded onto the main valve body 10. The check valve core 32 is cylindrical in shape. One end of the check spring 31 abuts against the inward side of the positioning bolt 33, and the other end of the check spring 31 abuts against the inner wall of the check valve core 32. The check valve core 32 includes an end face 321 and a side wall face 322, which slides in conjunction with the inner wall of the mounting channel 131. The pressure relief channel 130 includes a first passage 1301 and a second passage 1302. One end of the first passage 1301 is connected to the main valve chamber 102, and the other end is connected to the mounting hole 131. The third valve port 105 is located at the connection between the first passage 1301 and the mounting hole 131. One end of the second passage 1302 is connected to the mounting hole 131, and the other end is connected to the outlet channel 16. In the closed state of the lift valve in this invention, when the pressure inside the main valve chamber 102 is within a preset range, the end face 321 of the check valve core 32 abuts against and blocks the third valve port 105 under the action of the fluid pressure and spring force in the outlet channel 16. The flowing medium in the outlet channel 16 cannot flow back through the third valve port 105, thus playing a check function. When the pressure inside the main valve chamber 102 is greater than the preset range, the check valve core 32 moves and disengages from the third valve port 105 under the influence of the fluid pressure, and the fluid in the main valve chamber 102 enters the outlet channel 16 through the pressure relief channel 130.

[0032] Through the above structural design, the lift valve of the present invention can be applied to a high-pressure fluid system. The check valve component 3 installed in the pressure relief part 13 can disengage from the third valve port 105 when the pressure inside the main valve chamber 102 is too high, open the pressure relief channel 130, automatically balance the pressure inside the main valve chamber 102, prevent the high-pressure fluid from damaging the internal components of the main valve body 10, and reset and close the third valve port 105 after the pressure drops to a preset range to prevent the fluid in the outlet channel 16 from flowing back.

[0033] Furthermore, such as Figure 3 , Figure 8 , Figure 9 , Figure 10 , Figure 11As shown, the mounting part 12 includes a branch channel 120, which includes a branch port 1201 located on the inner wall of the small-diameter section. The mounting part 12 also includes a mounting port 124. One end of the branch channel 120 is connected to the upper valve chamber 101 through the branch port 1201, and the other end of the branch channel 120 is connected to the mounting port 124. When the lift valve in this invention does not need to be connected to functional devices such as the pressure gauge 6, the mounting part 12 is threaded with a second valve cap 121, and the mounting port 124 is blocked by the second valve cap 121. When the valve body assembly 1 is connected to other functional devices, taking the pressure gauge 6 as an example, after the first valve port 103 is closed, the second valve cap 121 is removed, the outer pipe 123 is connected to the mounting port 124 and fixed by the clamping nut 122. The outer pipe 123 connects the branch channel 120 and the external functional device, and then the first valve port 103 is opened. The connection process is simple to operate, has high interface compatibility, and is not affected by the internal pressure of the valve body.

[0034] In one embodiment, the lift valve is a gate valve. The valve core assembly 2 includes a valve stem 21 and a gate 22. The valve stem 21 is threadedly connected to the valve body assembly 1, and the gate 22 is inserted into the valve stem 21. Rotating the valve stem 21 causes the gate 22 to move up and down. The gate 22 includes a sealing section 221 and a through hole 222, with the through hole 222 located below the sealing section 221. The valve stem 21 includes a first sealing part 212, and the sealing section 221 on the gate 22 includes a second sealing part 2211 and a third sealing part 2212. The second sealing part 2211 is located on the side of the sealing section 221 facing the second valve port 104, and the third sealing part 2212 is located on the opposite side of the second sealing section 221. When the valve stem 21 moves upward and the first valve port 103 is closed, the through hole 222 connects the inlet channel 15 and the outlet channel 16; when the valve stem 21 moves downward, the sealing section 221 blocks the outlet channel 16, and the second valve port 104 is closed.

[0035] Specifically, the outer wall surface of the valve stem 21 includes a threaded section 211, and the inner wall surface of the valve body assembly 1 includes a threaded mating portion 17. The threaded structure of the threaded section 211 and the threaded mating portion 17 engages, allowing the valve stem 21 to be rotatably connected to the inner wall of the valve body assembly 1. Furthermore, the valve core assembly 2 includes a sealing gasket, a washer, and a clamping screw. The sealing gasket, washer, and clamping screw are fitted onto the valve stem 21 and positioned above the threaded section 211 to prevent fluid in the upper valve chamber 101 from leaking out through the gap in the threaded mating, while also limiting the movement of the valve stem 21. Figure 9 As shown, the branch port 1201 is located between the threaded mating portion 17 and the first valve port 103. Preferably, the inner wall surface of the valve body assembly 1 corresponding to the upper valve chamber 101 includes an enlarged portion located between the threaded mating portion 17 and the first valve port 103. The branch passage 120 communicates with this enlarged portion, which can prevent the fluid flow in the branch passage 120 from being blocked by the valve stem 21 when filling with fluid or evacuating.

[0036] Furthermore, the valve stem 21 is inserted into the gate 22. The valve stem 21 includes an insertion section 213 on the side facing the gate 22. The insertion section 213 is narrower than other parts of the valve stem 21, and an annular groove 2131 is provided circumferentially on the outer peripheral surface of the insertion section 213. The gate 22 includes a positioning hole 223 and an insertion hole 224. The positioning hole 223 is located on the end face of the gate 22 facing the valve stem 21, and the insertion hole 224 communicates from the side wall of the sealing section 221 to the positioning hole 223. Preferably, the two insertion holes 224 communicate from the second sealing section 2211 and the third sealing section 2212 to the inner side wall of the positioning hole 223, respectively. When the valve stem 21 is connected to the gate 22, the insertion section 213 is inserted into the positioning hole 223. The insertion hole 224 and the annular groove 2131 are positioned opposite each other. The valve core assembly 2 also includes a positioning pin 23. One end of the positioning pin 23 is fixed to the insertion hole 224, and the other end is inserted into the annular groove 2131. The positioning pin 23 is limited to the annular groove 2131 and can rotate along the annular groove 213, connecting the gate 22 to the valve stem 21 and allowing the gate 22 and the valve stem 21 to rotate relative to each other.

[0037] In one embodiment, such as Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 11 As shown, the valve body assembly 1 includes a main valve body 10, a valve seat 18, a flow guide 151, and an annular seal 161. A first valve port 103, a branch passage 120, and a pressure relief passage 130 are located in the main valve body 10. The valve seat 18 is detachably connected to the port on the side of the main valve body 10 that connects to the inlet passage 15. One outward end of the valve seat 18 is connected to the inlet pipe 4, and the inward end is connected to the flow guide 151. The annular seal 161 is fixed inside the main valve body 10 and communicates with the outlet passage 16 on the main valve body 10. A second valve port 104 is located within the annular seal 161.

[0038] Specifically, the inlet channel 15 includes an inlet pipe 4, a valve seat 18, and a flow guide 151; the outlet channel 16 includes an annular seal 161, an outlet pipe 5, and a portion of the main valve body 10 that communicates with the annular seal 161 and the outlet pipe 5. The inlet channel 15 and the outlet channel 16 are axially opposite each other. The flow guide 151 and the annular seal 161 limit and guide the gate 22, such as... Figure 5 and Figure 11As shown, when the valve core assembly 2 moves, a portion of the gate 22 remains between the guide member 151 and the annular seal 161 to ensure smooth valve operation and prevent the valve core assembly 2 from shifting due to fluid influence. In the open state, the gate 22 moves upward, connecting the inlet channel 15 and the outlet channel 16 through the through-hole 222 on the gate 22; in the closed state, the gate 22 moves downward, blocking the inlet channel 15 and the outlet channel 16 with the sealing section 221 on the gate 22. Preferably, to ensure sealing performance and a low coefficient of friction, the sealing method between the annular seal 161 and the gate 22 is a soft seal, and the annular seal 161 is preferably made of PTFE material.

[0039] In one embodiment, the flow guide 151 includes a first flow guide channel 1510 and a second flow guide channel 1511. The second flow guide channel 1511 is located on the side wall of the flow guide 151 and communicates with the first flow guide channel 1510. Preferably, in the closed state, the second sealing section 221 blocks the second valve port 104 on the annular seal 161, closing the outlet channel 16. At this time, the third sealing section 221 blocks the first flow guide channel 1510 on the flow guide 151, so as to press the second sealing section 221 onto the annular seal 161 by means of the fluid pressure in the first flow guide channel 1510; however, the second flow guide channel 1511 of the flow guide 151 is always connected to the inlet channel 15 and the main valve chamber 102 to maintain the internal pressure of the valve body assembly 1 stable. Furthermore, the flow guide 151 can be a tubular component, the first flow guide channel 1510 is an axial through hole of the flow guide 151, and the second flow guide channel 1511 is a lateral through hole located on the side wall of the flow guide 151.

[0040] Furthermore, the small-diameter section of the main valve body 10 includes a first port 11, and the large-diameter section of the main valve body 10 includes a second port 14, which is blocked by a fourth valve cap 141. The main valve chamber 102 includes a lower receiving chamber 1021, which is located between the fourth valve cap 141 and the valve seat 18. When the second valve port 104 is closed, the through hole 222 and part of the gate 22 are located in the lower receiving chamber 1021, that is, the lower receiving chamber 1021 accommodates the descending gate 22 when the valve is closed.

[0041] When assembling the lift valve in this invention, after the annular seal 161 is fixed inside the main valve body 10, the valve core assembly 2 is installed from the second port 14. A gasket, sealing ring, and clamping screw are installed on the first port 11 side to fix the valve stem 21. Then, the valve seat 18 is threadedly connected to the inlet port 100 on the main valve body 10, fitting the guide member 151 into place. Together with the annular seal 161, they limit the gate 22. By providing a detachable valve seat 18, the disassembly and positioning of the guide member 151 can be easily completed, simplifying the overall assembly process of the lift valve. The fourth valve cap 141 is threadedly connected to the main valve body 10 and then welded for sealing, ensuring the sealing performance of the main valve body 10.

[0042] Furthermore, the lift valve also includes a first valve cap 111, which covers the first port 11. The first valve cap 111 includes a valve cap cavity 1011, and when the first valve port 103 is closed, the upper section of the valve stem 21 is located in the valve cap cavity 1011. The first valve cap 111 is threadedly connected to the main valve body 10. The first port 11 side of the main valve body 10 is sealed by a sealing ring located between the valve stem 21 and the inner wall of the valve body. By further providing the first valve cap 111, the operating end of the valve stem 21 can be protected, and the valve can be prevented from being opened by accidental operation.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and intended to aid in understanding the method and core concepts of the present invention. It should be noted that those skilled in the art can make various modifications to the present invention without departing from its principles, and these modifications also fall within the scope of protection of the present invention.

Claims

1. A poppet valve with pressure relief function, comprising a valve body assembly (1), a valve core assembly (2) and a check assembly (3), characterized in that: The valve body assembly (1) includes an inlet channel (15), an outlet channel (16), a branch channel (120), a pressure relief channel (130), a first valve port (103), and a second valve port (104); the inner cavity of the valve body assembly (1) includes an upper valve cavity (101) and a main valve cavity (102), the upper valve cavity (101) is located above the first valve port (103), the main valve cavity (102) is located below the first valve port (103), the branch channel (120) is connected to the upper valve cavity (101), and the inlet channel (15) is connected to the main valve cavity (102); The valve core assembly (2) includes a first sealing part (212) and a second sealing part (2211). The valve core assembly (2) is capable of moving longitudinally along the valve body assembly (1) so that the first sealing part (212) closes the first valve port (103) or the second sealing part (2211) closes the second valve port (104). When the first valve port (103) is closed, the upper valve chamber (101) is not in communication with the main valve chamber (102). The check valve assembly (3) controls the opening and closing of the pressure relief channel (130). When the second valve port (104) is closed and the main valve chamber (102) is under pressure overload, the check valve assembly (3) opens the pressure relief channel (130), and the main valve chamber (102) can be connected to the outlet channel (16) through the pressure relief channel (130).

2. The lifting valve with pressure relief function as described in claim 1, characterized in that, The valve body assembly (1) includes a mounting part (12), and one end of the branch channel (120) away from the upper valve chamber (101) is located on the end face of the mounting part (12). The mounting part (12) can be connected to a functional device.

3. The lifting valve with pressure relief function as described in claim 1, characterized in that, The valve body assembly (1) includes a mounting part (12) and a second valve cap (121). One end of the branch channel (120) away from the upper valve chamber (101) is located on the end face of the mounting part (12). The mounting part (12) is connected to the second valve cap (121).

4. The lifting valve with pressure relief function as described in any one of claims 1-3, characterized in that, The valve core assembly (2) includes a valve stem (21) and a gate (22). The valve stem (21) is kinetically connected to the gate (22). The valve stem (21) is threadedly connected to the valve body assembly (1). The valve stem (21) includes a first sealing part (212). The gate (22) includes a sealing section (221) and a through hole (222). The through hole (222) is located below the sealing section (221). The second sealing part (2211) is located on the side of the sealing section (221) facing the outlet channel (16). The through hole (222) can connect the inlet channel (15) and the outlet channel (16).

5. The lifting valve with pressure relief function as described in claim 4, characterized in that, The valve stem (21) includes a threaded section (211) located above the first sealing part (212); the main valve body (10) includes a threaded mating part (17); the branch channel (120) includes a branch port (1201) located on the inner wall of the valve body assembly (1); the branch port (1201) is located between the threaded mating part (17) and the first valve port (103).

6. The lifting valve with pressure relief function as described in claim 4, characterized in that, The side wall of the valve stem (21) includes an insertion section (213), which is located below the first sealing part (212). The insertion section (213) includes an annular groove (2131), which is recessed inward along the circumference of the insertion section (213). The gate (22) includes a positioning hole (223) and an insertion hole (224). The positioning hole (223) is recessed downward relative to the upper end face of the gate (22). One end of the insertion hole (224) is located on the inner side wall of the positioning hole (223), and the other end of the insertion hole (224) is located on the outer side wall of the sealing section (221). The valve core assembly (2) further includes a positioning pin (23). The valve stem (21) is inserted into the gate (22). The insertion section (213) is at least partially located in the positioning hole (223) and is clearance-fitted with the positioning hole (223). The positioning pin (23) passes through the insertion hole (224). The positioning pin (23) is partially located in the annular groove (2131). The positioning pin (23) is limitedly connected to the annular groove (2131). The positioning pin (23) can rotate along the annular groove (2131).

7. The lifting valve with pressure relief function as described in any one of claims 1-6, characterized in that, The main valve chamber (102) includes a lower receiving chamber (1021), and when the second valve port (104) is closed, the through hole (222) is located in the lower receiving chamber (1021); The valve body assembly (1) includes a fourth valve cap (141) that blocks the lower receiving cavity (1021).

8. The lifting valve with pressure relief function as described in any one of claims 4-7, characterized in that, The valve body assembly (1) includes a flow guide (151), which includes a first flow guide channel (1510) and a second flow guide channel (1511). The second flow guide channel (1511) connects the first flow guide channel (1510) and the main valve chamber (102). The first end of the first flow guide channel (1510) connects to the inlet channel (15). As the valve core assembly (2) moves, the second end of the first flow guide channel (1510) can connect to the through hole (222) or be blocked by the sealing section (221).

9. The lifting valve with pressure relief function as described in claim 8, characterized in that, The valve body assembly (1) further includes an annular seal (161), which is disposed opposite to the flow guide (151). The second valve port (104) is located at the end of the annular seal (161) facing the flow guide (151). When the second valve port (104) is in the open state, the inlet channel (15), the first flow guide channel (1510), the through hole (222), the second valve port (104), and the outlet channel (16) are connected. The gate (22) is at least partially located between the flow guide (151) and the annular seal (161). The gate (22) is slidably engaged with the flow guide (151) and the annular seal (161). When the gate (22) abuts against the annular seal (161), the second valve port (104) is in a closed state.

10. The lifting valve with pressure relief function as described in claim 9, characterized in that, The valve body assembly (1) includes a main valve body (10) and a valve seat (18). The outlet channel (16), the branch channel (120), the pressure relief channel (130), and the first valve port (103) are located in the main valve body (10). The main valve body (10) includes an inlet port (100). The valve seat (18) is detachably fixedly connected to the inlet port (100). The flow guide (151) is fixedly connected to one end of the valve seat (18). The lift valve with pressure relief function also includes an inlet pipe (4). The inlet pipe (4) is fixedly connected to the other end of the valve seat (18). The valve seat (18) connects the inlet pipe (4) and the first flow guide channel (1510).

11. The lifting valve with pressure relief function as described in any one of claims 1-10, characterized in that, The valve body assembly (1) includes a pressure relief section (13), which includes a pressure relief channel (130), a mounting hole (131), and a third valve cap (132). The pressure relief channel (130) communicates with the mounting hole (131), and the check valve assembly (3) is located inside the mounting hole (131). The mounting hole (131) is blocked by the third valve cap (132).

12. The lifting valve with pressure relief function as described in claim 11, characterized in that, The check assembly (3) includes a check spring (31), a check valve core (32), and a positioning bolt (33). The positioning bolt (33) is connected to the inner wall of the mounting hole (131). One end of the check spring (31) abuts against the positioning bolt (33), and the other end of the check spring (31) abuts against the check valve core (32). The check valve core (32) can block the pressure relief channel (130).

13. The lifting valve with pressure relief function as described in claim 12, characterized in that, The valve body assembly includes a third valve port (105), and the pressure relief channel (130) includes a first passage (1301) and a second passage (1302). The first passage (1301) connects the main valve chamber (102) and the mounting channel (131), and the second passage (1302) connects the mounting channel (131) and the outlet channel (16). The third valve port (105) is located between the first passage (1301) and the mounting channel (131), and the third valve port (105) can be blocked by the check valve core (32) to shut off the pressure relief channel (130).

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