Pressure gauge emptying pollution discharge sampling detection device
By designing a pressure gauge venting and sewage sampling detection device, and utilizing a buffer tube and multi-channel valve core structure, the problem of pressure gauges being easily affected by pipeline fluctuations is solved, achieving convenient fluid buffering and sampling, and extending the service life of the pressure gauge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU FUXIANG VALVE MFG
- Filing Date
- 2026-03-03
- Publication Date
- 2026-05-12
AI Technical Summary
Existing pressure gauges are directly connected to the pipeline system, making them susceptible to fluctuations in pipeline pressure, resulting in complex structures, inconvenient installation and maintenance, and shortened service life.
Design a pressure gauge venting and sewage sampling detection device. Through the combination of sampling valve, buffer tube and pressure gauge, the buffer tube is set in a spiral shape. Combined with the multi-channel design of valve core, the fluid is buffered and backflowed to avoid direct impact.
It effectively mitigates the impact of pipeline pressure fluctuations on the pressure gauge, extends its service life, and facilitates fluid sampling through the sampling port, avoiding fluid contamination.
Smart Images
Figure CN122016396A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of detection devices, specifically a pressure gauge venting and sewage discharge sampling detection device. Background Technology
[0002] Sampling and testing generally refers to taking a portion out of the whole according to rules and testing it with experiments or instruments to determine whether the whole is qualified or meets the standards. A Chinese patent document with publication number CN220104566U discloses a sampling device for a water treatment chemical analysis instrument. The device includes a pre-sampling water tank, which is divided into a primary sedimentation zone and a filtration zone by a partition plate. The filtration zone contains a stainless steel mesh and filler material. A sampling water pipe is located in the primary sedimentation zone. A manual sampling valve is installed on the sampling water pipe. One end of the primary sedimentation zone is connected to a first overflow pipe, and the bottom is connected to a second drain pipe via two separate pipes. One pipe has a drain solenoid valve, and the other pipe has a manual drain valve. The filtration zone is connected to an outlet pipe via a water pump. The outlet pipe is sequentially equipped with a pressure gauge, a check valve, an outlet valve, an outlet solenoid valve, a Y-type filter, and an outlet shut-off solenoid valve. However, the above-mentioned solutions require independent pressure gauges, check valves, and outlet valves for detecting fluid substances in pipelines. This results in multiple independent installation and connection structures, making installation and subsequent maintenance more complicated. Furthermore, in the above solutions, the pressure gauge is directly connected to the pipeline system, and the pressure waves in the pipeline system directly exert a strong force on the pressure gauge, which can easily damage the pressure gauge's detection unit and affect its service life. Therefore, this invention proposes a pressure gauge venting and sewage discharge sampling detection device to solve the above problems. Summary of the Invention
[0003] The purpose of this invention is to provide a pressure gauge venting and sewage sampling detection device to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a pressure gauge venting and sewage discharge sampling and detection device, comprising: A sampling valve includes a main valve body, a valve core limiting seat, a valve core, a valve shaft, and a handle. Both the main valve body and the valve core limiting seat have valve cavities. The valve core limiting seat is threaded onto the main valve body. The valve core is movably disposed within the valve cavities on the main valve body and the valve core limiting seat. A valve shaft mounting groove is formed through the side wall of the valve cavity on the main valve body. The valve shaft is rotatably disposed within the valve shaft mounting groove. The handle is fixedly connected to the outer end of the valve shaft, and the inner end of the valve shaft is fixedly connected to the valve core. A four-stage channel is formed on the side wall of the valve cavity on the valve core limiting seat. A four-stage connection port is formed at the outer port of the four-stage channel, and the four-stage connection port is threadedly connected to a tee connector on the pipeline system. The buffer tube has a primary channel, a secondary channel, and a tertiary channel on the side wall of the valve cavity of the main valve body. The outer ends of the primary channel, the secondary channel, and the tertiary channel are integrally formed with a primary connection port, a secondary connection port, and a sampling port, respectively. A sealing cap is threaded to the end of the sampling port. The buffer tube is connected to the primary connection port through a primary pipe connector. The middle part of the buffer tube is spirally arranged. A connecting tube is fixedly welded to the upper side wall of the buffer tube. The connecting tube is connected to the buffer tube. The lower end of the connecting tube is connected to the sampling port through a secondary pipe connector. A pressure gauge, the inlet of which is threaded to the upper end of a buffer tube.
[0005] Preferably, the valve core has a primary flow channel, a secondary flow channel, and a main flow channel. The primary and secondary flow channels are both arc-shaped channel structures, and the main flow channel is a straight channel. The primary and secondary flow channels are symmetrically arranged on both sides of the main flow channel. When the pressure gauge is in monitoring mode, when the valve core rotates to the point where the main flow channel connects with the primary and secondary channels, the ports of the primary and secondary flow channels are staggered from the ports of the secondary and tertiary channels.
[0006] Preferably, when the sampling valve is in the sewage sampling process, the main flow channel and the primary channel are set at a 45° angle. At this time, the secondary flow channel is connected to the secondary and quaternary channels, and the primary flow channel is connected to the primary and tertiary channels. At this time, the main flow channel is staggered from the primary, secondary, tertiary, and quaternary channels.
[0007] Preferably, a limiting hole is formed on the side wall of the valve cavity of the main valve body. The limiting hole has a fan-shaped structure and a central angle of 225°. A primary movable hole is formed on the side wall of the valve core. The primary movable hole has a hexagonal cross-section. A movable column is movably installed in the primary movable hole. The cross-sectional dimensions of the movable column match the cross-sectional dimensions of the primary movable hole. A primary spring groove is formed on the inner end of the movable column. A primary support spring is fixedly glued to the bottom of the primary spring groove. The outer end of the primary support spring is fixedly glued to the bottom of the primary movable hole. A limiting column is integrally formed on the outer end of the movable column. The cross-section of the limiting column is semi-circular.
[0008] Preferably, the two sides of the limiting hole are respectively designated as surface M and surface N. When the valve core rotates until the plane of the limiting post aligns with surface M, the main flow channel connects to the primary channel and the quaternary channel. When the valve core rotates until the plane of the limiting post aligns with surface N, the secondary flow channel connects to the secondary channel and the quaternary channel.
[0009] Preferably, the valve core has a valve shaft mating hole, the side wall of the valve shaft mating hole has a locking hole, the side wall of the valve shaft has a secondary movable hole, a pair of secondary movable holes are symmetrically provided, and the width of the secondary movable hole matches the width of the locking hole. The cross-section of the secondary movable hole is square, and a locking block is movably installed in the secondary movable hole. A secondary support spring is fixedly glued to the inner end of the locking block, and the inner end of the secondary support spring is fixedly glued to the bottom of the secondary movable hole. When the secondary support spring is in the reset state, the outer end of the locking block is inserted into the locking hole.
[0010] Preferably, the cross-section of the locking block is a right-angled trapezoid, and the inclined surface of the locking block is arranged facing the inside of the locking hole.
[0011] Preferably, the main valve body has a three-stage movable groove, and the side wall of the three-stage movable groove has a push block groove. A movable rod is movably arranged in the three-stage movable groove. A three-stage support spring is fixedly glued to the inner end of the movable rod. The inner end of the three-stage support spring is fixedly glued to the bottom of the three-stage movable groove. A locking rod is integrally formed on the outer end of the movable rod. An annular seat is integrally formed on the side wall of the valve core limiting seat. A locking rod hole is formed on the side of the annular seat facing the main valve body. The locking rod hole is arranged around the circumference of the annular seat. When the three-stage support spring is in the reset state, the end of the locking rod is locked into the locking rod hole.
[0012] Preferably, a push rod is integrally formed on the side wall of the movable rod, the push rod passes through the push block groove, and when the push rod is pushed up, the locking rod completely disengages from the locking rod hole.
[0013] Preferably, a primary sealing groove is provided at the interface between the main valve body and the valve core limiting seat, and a primary sealing ring is embedded in the primary sealing groove. A secondary sealing groove is provided on the side wall of the valve shaft, and a secondary sealing ring is embedded in the secondary sealing groove. A tertiary sealing ring is provided at the connection position between the buffer tube and the primary connection port. A quaternary sealing ring is provided at the connection position between the connecting tube and the sampling port. A quinary sealing ring is provided on the inner side of the sealing cap.
[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a pressure gauge venting and sewage sampling detection device consisting of a sampling valve, a buffer tube, and a pressure gauge, and by setting the middle part of the buffer tube in a spiral shape, the buffer tube can buffer the pressure fluctuations in the pipeline system to avoid the fluid from having a strong direct impact on the pressure gauge, thereby affecting the overall service life of the pressure gauge. 2. By opening primary, secondary, and tertiary channels on the main valve body of the sampling valve, and primary, secondary, and main flow channels on the valve core, the rotation of the valve core allows the secondary flow channels to connect with the secondary and tertiary channels, and the primary flow channels to connect with the primary and tertiary channels. This allows the fluid in the buffer tube to flow back and be discharged through the sampling port, thus preventing the fluid in the buffer tube from decomposing due to long-term presence and causing contamination of the fluid in the pipeline system. Furthermore, the sampling port allows personnel to easily sample the fluid in the pipeline system. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a schematic diagram of the rear structure of the present invention; Figure 4 This is a half-sectional view of the main valve body of the present invention; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point B; Figure 6 This is a schematic diagram of the valve core limiting seat structure of the present invention; Figure 7 This is a half-sectional view of the present invention along the sampling port direction; Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point C; Figure 9 for Figure 8 Enlarged schematic diagram of the structure at point D; Figure 10 This is a schematic diagram of the pressure gauge of the present invention in monitoring mode; Figure 11 for Figure 10 Enlarged schematic diagram of the structure at point E in the middle; Figure 12 This is a half-sectional view of the present invention along the valve axis direction; Figure 13 for Figure 12 Enlarged schematic diagram of the structure at point F; Figure 14 for Figure 13 Enlarged schematic diagram of the structure at point G in the middle; Figure 15 for Figure 13 Enlarged schematic diagram of the structure at point H; Figure 16 for Figure 13 Enlarged schematic diagram of the structure at point J; Figure 17 This is a schematic diagram of the valve core structure of the present invention; Figure 18 for Figure 17 Enlarged schematic diagram of the structure at point K; Figure 19 This is a schematic diagram of the valve shaft structure of the present invention.
[0016] In the diagram: 1. Sampling valve; 2. Buffer tube; 3. Pressure gauge; 4. Main valve body; 5. Valve core limit seat; 6. Valve core; 7. Valve shaft; 8. Handle; 9. Valve chamber; 10. Primary channel; 11. Secondary channel; 12. Tertiary channel; 13. Primary connection port; 14. Secondary connection port; 15. Sampling port; 16. Quaternary channel; 17. Quaternary connection port; 18. Connecting pipe; 19. Primary pipe connector; 20. Secondary pipe connector; 21. Sealing cap; 22. Primary flow channel; 23. Secondary flow channel; 24. Main flow channel; 25. Limiting hole. 5. Primary movable hole 26, movable column 27, primary spring groove 28, primary support spring 29, limiting column 30, engaging hole 31, secondary movable hole 32, engaging block 33, secondary support spring 34, tertiary movable groove 35, movable rod 36, tertiary support spring 37, engaging rod 38, annular seat 39, engaging rod hole 40, push block groove 41, push rod 42, primary sealing ring 43, tertiary sealing ring 45, quaternary sealing ring 47, quinary sealing ring 48, secondary sealing ring 49. Detailed Implementation
[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.
[0018] Please see Figures 1-19 The present invention provides the following three preferred embodiments: Example 1: A pressure gauge venting and sewage sampling detection device includes a sampling valve 1, a buffer tube 2, and a pressure gauge 3. The sampling valve 1 includes a main valve body 4, a valve core limiting seat 5, a valve core 6, a valve shaft 7, and a handle 8. Both the main valve body 4 and the valve core limiting seat 5 have valve chambers 9. The valve core limiting seat 5 is threadedly connected to the main valve body 4. The valve core 6 is movably disposed within the valve chambers 9 on the main valve body 4 and the valve core limiting seat 5. A valve shaft mounting groove is formed through the side wall of the valve chamber 9 on the main valve body 4, allowing the valve shaft 7 to rotate. The valve is installed in the valve shaft mounting groove. The handle 8 is fixedly connected to the outer end of the valve shaft 7, and the inner end of the valve shaft 7 is fixedly connected to the valve core 6. A four-stage channel 16 is opened on the side wall of the valve cavity 9 on the valve core limiting seat 5. A four-stage connection port 17 is formed at the outer port of the four-stage channel 16. The four-stage connection port 17 is threaded to the tee connector on the pipeline system. A primary channel 10, a secondary channel 11, and a tertiary channel 12 are opened on the side wall of the valve cavity of the main valve body 4. The primary channel 10, the secondary channel 11, and the tertiary channel 12 are respectively opened on the side wall of the valve cavity. 1. The outer ends of the three-stage channel 12 are integrally formed with a primary connection port 13, a secondary connection port 14, and a sampling port 15. A sealing cap 21 is threadedly connected to the port of the sampling port 15. The buffer tube 2 is connected to the primary connection port 13 through a primary pipe connector 19. The middle part of the buffer tube 2 is spirally arranged. A connecting pipe 18 is fixedly welded to the upper side wall of the buffer tube 2. The connecting pipe 18 is connected to the buffer tube 2. The lower end of the connecting pipe 18 is connected to the sampling port 15 through a secondary pipe connector 20. The inlet of the pressure gauge 3 is threadedly connected to the upper end of the buffer tube 2. By setting up a pressure gauge venting and sewage discharge sampling detection device composed of a sampling valve 1, a buffer tube 2, and a pressure gauge 3, and by setting the middle part of the buffer tube 2 in a spiral arrangement, the buffer tube 2 can buffer the pressure fluctuations in the pipeline system to avoid the fluid from having a strong direct impact on the pressure gauge 3, thereby affecting the overall service life of the pressure gauge 3.
[0019] Example 2: Please refer to Figure 7-11Based on Embodiment 1, the valve core 6 has a primary flow channel 22, a secondary flow channel 23, and a main flow channel 24. The primary and secondary flow channels 22 and 23 are both arc-shaped, while the main flow channel 24 is a straight channel. The primary and secondary flow channels 22 and 23 are symmetrically arranged on both sides of the main flow channel 24. When the pressure gauge 3 is in monitoring mode, the valve core 6 rotates until the main flow channel 24 connects with the primary channel 10 and the quaternary channel 16. At this time, the ports of the primary and secondary flow channels 22 and 23 are staggered from the ports of the secondary and tertiary channels 11 and 12. When the sampling valve 1 is in the sewage sampling process, the main flow channel 24 is set at a 45° angle to the primary channel 10. At this time, the secondary flow channel 23 connects with the secondary channel 11 and the quaternary channel 16, and the primary flow channel 22 connects with the primary channel 10 and the tertiary channel 12. The flow channel 24 is staggered from the primary channel 10, secondary channel 11, tertiary channel 12, and quaternary channel 16. By opening the primary channel 10, secondary channel 11, and tertiary channel 12 on the main valve body 4 of the sampling valve 1, and opening the primary flow channel 22, secondary flow channel 23, and main flow channel 24 on the valve core 6 of the sampling valve 1, the rotation of the valve core 6 allows the secondary flow channel 23 to connect with the secondary channel 11 and quaternary channel 16, and the primary flow channel 22 to connect with the primary channel 10 and tertiary channel 12. This allows the fluid in the buffer tube 2 to flow back and be discharged through the sampling port 15, thus preventing the fluid in the buffer tube 2 from decomposing due to long-term presence and causing contamination of the fluid in the pipeline system. Furthermore, the sampling port 15 allows personnel to conveniently sample the fluid in the pipeline system.
[0020] A limiting hole 25 is provided on the side wall of the valve cavity 9 of the main valve body 4. The limiting hole 25 has a fan-shaped hole structure and the central angle of the limiting hole 25 is 225°. A first-stage movable hole 26 is provided on the side wall of the valve core 6. The first-stage movable hole 26 has a hole structure with a regular hexagonal cross-section. A movable column 27 is movably installed in the first-stage movable hole 26. The cross-sectional dimensions of the movable column 27 match the cross-sectional dimensions of the first-stage movable hole 26. A first-stage spring groove 28 is provided on the inner end of the movable column 27. A first-stage support spring 29 is fixedly glued to the bottom of the groove of the first-stage spring groove 28. The outer end of the first-stage support spring 29 is fixedly glued to the bottom of the hole of the first-stage movable hole 26. A limiting column 30 is integrally formed on the outer end of the movable column 27. The cross-section of the limiting column 30 is semi-circular.
[0021] The two sides of the limiting hole 25 are designated as surface M and surface N, respectively. When the valve core 6 rotates to the point where the plane of the limiting post 30 is in contact with surface M, the main flow channel 24 connects to the primary channel 10 and the quaternary channel 16. When the valve core 6 rotates to the point where the plane of the limiting post 30 is in contact with surface N, the secondary flow channel 23 connects to the secondary channel 11 and the quaternary channel 16. The limiting hole 25 restricts the operating range of the limiting post 30, thereby limiting the rotation range of the valve core 6 and ensuring that the valve core 6 can accurately rotate to the designated position.
[0022] Example 3: Please refer to Figure 12-19 Based on Embodiment 2, the valve core 6 has a valve shaft docking hole, and the side wall of the valve shaft docking hole has a locking hole 31. The side wall of the valve shaft 7 has a secondary movable hole 32. A pair of secondary movable holes 32 are symmetrically provided, and the width of the secondary movable hole 32 matches the width of the locking hole 31. The cross-section of the secondary movable hole 32 is square. A locking block 33 is movably installed in the secondary movable hole 32. A secondary support spring 34 is fixedly glued to the inner end of the locking block 33. The inner end of the secondary support spring 34 is fixedly glued to the bottom of the secondary movable hole 32. When the secondary support spring 34 is in the reset state, the outer end of the locking block 33 is inserted into the locking hole 31, which facilitates the quick assembly of the valve shaft 7 and the valve core 6.
[0023] The cross-section of the locking block 33 is a right trapezoid, and the inclined surface of the locking block 33 is set towards the inside of the locking hole 31.
[0024] The main valve body 4 has a three-stage movable groove 35, and a push block groove 41 is formed on the side wall of the three-stage movable groove 35. A movable rod 36 is movably arranged in the three-stage movable groove 35. A three-stage support spring 37 is fixedly glued to the inner end of the movable rod 36. The inner end of the three-stage support spring 37 is fixedly glued to the bottom of the three-stage movable groove 35. A locking rod 38 is integrally formed on the outer end of the movable rod 36. An annular seat 39 is integrally formed on the side wall of the valve core limiting seat 5. A locking rod hole 40 is formed on the side of the annular seat 39 facing the main valve body 4. The locking rod hole 40 is arranged around the annular seat 39 in a circle. When the three-stage support spring 37 is in the reset state, the end of the locking rod 38 is locked into the locking rod hole 40. By locking the locking rod 38 into the locking rod hole 40, the connection stability between the valve core limiting seat 5 and the main valve body 4 is effectively guaranteed.
[0025] A push rod 42 is integrally formed on the side wall of the movable rod 36. The push rod 42 passes through the push block groove 41. When the push rod 42 is pushed up, the locking rod 38 completely disengages from the locking rod hole 40.
[0026] The interface between the main valve body 4 and the valve core limiting seat 5 is provided with a primary sealing groove, in which a primary sealing ring 43 is embedded. The side wall of the valve shaft 7 is provided with a secondary sealing groove, in which a secondary sealing ring 49 is embedded. A tertiary sealing ring 45 is provided at the connection position between the buffer tube 2 and the primary connection port 13. A quaternary sealing ring 47 is provided at the connection position between the connecting tube 18 and the sampling port 15. A quinary sealing ring 48 is provided on the inner side of the sealing cover 21 to ensure the sealing of the connection between the structures.
[0027] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.
Claims
1. A pressure gauge venting and sewage discharge sampling and detection device, characterized in that: include: The sampling valve (1) includes a main valve body (4), a valve core limiting seat (5), a valve core (6), a valve shaft (7), and a handle (8). Both the main valve body (4) and the valve core limiting seat (5) have valve chambers (9). The valve core limiting seat (5) is threaded onto the main valve body (4). The valve core (6) is movably disposed within the valve chambers (9) on the main valve body (4) and the valve core limiting seat (5). A through-hole is formed on the side wall of the valve chamber (9) of the main valve body (4). There is a valve shaft mounting groove, the valve shaft (7) is rotatably mounted in the valve shaft mounting groove, the handle (8) is fixedly connected to the outer end of the valve shaft (7), the inner end of the valve shaft (7) is fixedly connected to the valve core (6), a four-level channel (16) is opened on the side wall of the valve cavity (9) on the valve core limiting seat (5), a four-level connection port (17) is formed at the outer port of the four-level channel (16), and the four-level connection port (17) is threadedly connected to the tee connector on the pipeline system; The buffer tube (2) has a primary channel (10), a secondary channel (11) and a tertiary channel (12) on the side wall of the valve cavity of the main valve body (4). The outer ends of the primary channel (10), the secondary channel (11) and the tertiary channel (12) are integrally formed with a primary connection port (13), a secondary connection port (14) and a sampling port (15). The sampling port (15) is threaded with a sealing cap (21). The buffer tube (2) is connected to the primary connection port (13) through a primary pipe connector (19). The middle part of the buffer tube (2) is spirally arranged. A connecting tube (18) is fixedly welded to the upper side wall of the buffer tube (2). The connecting tube (18) is connected to the buffer tube (2). The lower end of the connecting tube (18) is connected to the sampling port (15) through a secondary pipe connector (20). Pressure gauge (3), the inlet of which is threaded to the upper end of buffer tube (2).
2. The pressure gauge venting and sewage sampling detection device according to claim 1, characterized in that: The valve core (6) is provided with a primary flow channel (22), a secondary flow channel (23) and a main flow channel (24). The primary flow channel (22) and the secondary flow channel (23) are both arc-shaped channel structures. The main flow channel (24) is a straight channel. The primary flow channel (22) and the secondary flow channel (23) are symmetrically arranged on both sides of the main flow channel (24). When the pressure gauge (3) is in the monitoring state, when the valve core (6) rotates to the point where the main flow channel (24) connects with the primary channel (10) and the quaternary channel (16), the ports of the primary flow channel (22) and the secondary flow channel (23) are staggered from the ports of the secondary channel (11) and the tertiary channel (12).
3. The pressure gauge venting and sewage sampling detection device according to claim 2, characterized in that: When the sampling valve (1) is in the sewage sampling process, the main flow channel (24) is set at a 45° angle with the primary channel (10). At this time, the secondary flow channel (23) is connected to the secondary channel (11) and the quaternary channel (16), and the primary flow channel (22) is connected to the primary channel (10) and the tertiary channel (12). At this time, the main flow channel (24) is staggered from the primary channel (10), the secondary channel (11), the tertiary channel (12), and the quaternary channel (16).
4. The pressure gauge venting and sewage sampling detection device according to claim 3, characterized in that: The main valve body (4) has a limiting hole (25) on the side wall of the valve cavity (9). The limiting hole (25) is a fan-shaped hole structure with a central angle of 225°. The valve core (6) has a first-level movable hole (26) on its side wall. The first-level movable hole (26) is a hole structure with a regular hexagonal cross-section. A movable column (27) is movably installed in the first-level movable hole (26). The cross-sectional dimensions of the movable column (27) match the cross-sectional dimensions of the first-level movable hole (26). A first-level spring groove (28) is provided on the inner end of the movable column (27). A first-level support spring (29) is fixedly glued to the bottom of the groove of the first-level spring groove (28). The outer end of the first-level support spring (29) is fixedly glued to the bottom of the hole of the first-level movable hole (26). A limiting column (30) is integrally formed on the outer end of the movable column (27). The cross-section of the limiting column (30) is semi-circular.
5. The pressure gauge venting and sewage sampling detection device according to claim 4, characterized in that: The two sides of the limiting hole (25) are respectively referred to as the M surface and the N surface. When the valve core (6) rotates to the point where the plane of the limiting post (30) is in contact with the M surface, the main flow channel (24) connects the primary channel (10) and the quaternary channel (16). When the valve core (6) rotates to the point where the plane of the limiting post (30) is in contact with the N surface, the secondary flow channel (23) connects the secondary channel (11) and the quaternary channel (16).
6. The pressure gauge venting and sewage sampling detection device according to claim 1, characterized in that: The valve core (6) has a valve shaft docking hole, and the valve shaft docking hole has a locking hole (31) on its side wall. The valve shaft (7) has a secondary movable hole (32) on its side wall. A pair of secondary movable holes (32) are symmetrically provided, and the width of the secondary movable hole (32) matches the width of the locking hole (31). The cross-section of the secondary movable hole (32) is square. A locking block (33) is movably installed in the secondary movable hole (32). A secondary support spring (34) is fixedly glued to the inner end of the locking block (33). The inner end of the secondary support spring (34) is fixedly glued to the bottom of the secondary movable hole (32). When the secondary support spring (34) is in the reset state, the outer end of the locking block (33) is inserted into the locking hole (31).
7. The pressure gauge venting and sewage sampling detection device according to claim 6, characterized in that: The cross-section of the locking block (33) is a right trapezoid, and the inclined surface of the locking block (33) is set towards the inside of the locking hole (31).
8. The pressure gauge venting and sewage discharge sampling and detection device according to claim 1, characterized in that: The main valve body (4) is provided with a three-stage movable groove (35), and a push block groove (41) is provided on the side wall of the three-stage movable groove (35). A movable rod (36) is movably arranged in the three-stage movable groove (35). A three-stage support spring (37) is fixedly glued to the inner end of the movable rod (36). The inner end of the three-stage support spring (37) is fixedly glued to the bottom of the three-stage movable groove (35). A locking rod (38) is integrally formed on the outer end of the movable rod (36). An annular seat (39) is integrally formed on the side wall of the valve core limiting seat (5). A locking rod hole (40) is provided on the side of the annular seat (39) facing the main valve body (4). The locking rod hole (40) is arranged around the annular seat (39) in a circle. When the three-stage support spring (37) is in the reset state, the end of the locking rod (38) is locked into the locking rod hole (40).
9. The pressure gauge venting and sewage sampling detection device according to claim 8, characterized in that: A push rod (42) is integrally formed on the side wall of the movable rod (36). The push rod (42) passes through the push block groove (41). When the push rod (42) is pushed up, the locking rod (38) completely disengages from the locking rod hole (40).
10. The pressure gauge venting and sewage sampling detection device according to claim 1, characterized in that: The interface between the main valve body (4) and the valve core limiting seat (5) is provided with a first-level sealing groove, and a first-level sealing ring (43) is embedded in the first-level sealing groove. The side wall of the valve shaft (7) is provided with a second-level sealing groove, and a second-level sealing ring (49) is embedded in the second-level sealing groove. A third-level sealing ring (45) is provided at the connection position between the buffer tube (2) and the first-level connection port (13). A fourth-level sealing ring (47) is provided at the connection position between the connecting tube (18) and the sampling port (15). A fifth-level sealing ring (48) is provided on the inner side of the sealing cover (21).