Auxiliary valve for detecting on-line ventilation valve and cut-off mechanism for auxiliary valve

Abstract

The utility model relates to the technical field of valves, in particular to an auxiliary valve for detecting an on-line ventilation valve and a cut-off mechanism for the auxiliary valve, which comprises an auxiliary valve main body provided with a storage tank connecting port and a ventilation valve connecting port, and a detection bin arranged on the auxiliary valve main body is positioned between the storage tank connecting port and the ventilation valve connecting port; a cut-off mechanism used for cutting off the circulation cavity in the auxiliary valve body is detachably connected into the detection bin. The utility model provides an auxiliary valve for detecting an on-line ventilation valve, which can be connected between the ventilation valve and a storage tank and is used for communicating the ventilation valve and the storage tank during normal operation. When the ventilation valve needs to be detected, the cut-off mechanism used for cutting off the circulation cavity in the auxiliary valve body can be connected into the detection bin, so that the circulation cavity of the auxiliary valve body is separated, and communication between the storage tank and the ventilation valve is cut off.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically to an auxiliary valve for detecting an online ventilation valve and a cut-off mechanism used therefor. Background Art

[0002] In the prior art, when the ventilation valve on the storage tank needs to be inspected, it is necessary to remove the ventilation valve from the storage tank, lift it from the top of the tank to the ground with a crane, and send it to the manufacturer or a professional organization for inspection. The inspection cycle is long and the cost is high. In the process of removing the valve from the storage tank, the intact performance of the valve itself is easily damaged. There is a risk of parts or debris falling into the storage tank. Inflammable, explosive and harmful gases may also pose a threat to personal safety. There is also a risk of the valve falling during the lifting process. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an auxiliary valve for detecting an online ventilation valve and a cut-off mechanism used therefor.

[0004] The technical solution adopted by the utility model is:

[0005] An auxiliary valve for detecting an online ventilation valve comprises: an auxiliary valve body provided with a storage tank connection port and a ventilation valve connection port, a detection chamber arranged on the auxiliary valve body being located between the storage tank connection port and the ventilation valve connection port; and a cut-off mechanism detachably connected in the detection chamber for cutting off the internal flow chamber of the auxiliary valve body.

[0006] Furthermore, the auxiliary valve for detecting an online ventilation valve further includes: a first interface and a second interface provided on the auxiliary valve body; the first interface and the second interface are located on both sides of the detection chamber.

[0007] Furthermore, a tank connection flange is provided at the tank connection port of the auxiliary valve body, and a second interface is arranged on the side of the tank connection flange and is communicated with the flow chamber of the auxiliary valve body; the second interface is internally threaded and sealed to connect with a second screw plug.

[0008] Furthermore, a valve connecting flange is provided at the ventilation valve connecting port of the auxiliary valve body; the first interface is arranged on the side of the valve connecting flange and is connected to the flow chamber of the auxiliary valve body; the first interface is internally threaded and sealed to connect to the first screw plug.

[0009] Furthermore, the first interface and the second interface are arranged on the same side.

[0010] Furthermore, one end of the detection chamber is a closed end and the other end is an open end; the open end of the detection chamber is connected to a valve cover structure for opening or closing the detection chamber.

[0011] Furthermore, the valve cover structure includes a first valve cover, which is connected to a first flange at the open end of the detection chamber through a fastener; a gasket is provided between the first flange and the first valve cover.

[0012] Furthermore, a second flange is provided at the open end of the detection chamber, a bolt hole is provided at the lower end of the second flange, a support bolt is threadedly connected to the bolt hole, and a first U-shaped groove is provided at the upper end of the second flange; a fixed plate is connected to the top of the detection chamber, a shaft is connected to the fixed plate, and one end of the movable bolt is rotatably connected to the shaft; the valve cover structure includes a second valve cover, and second U-shaped grooves are provided at both upper and lower ends of the second valve cover, the second U-shaped groove at the lower end of the second valve cover is clamped on the support bolt, the movable bolt is clamped in the second U-shaped groove at the upper end of the second valve cover, and the nut threadedly connected to the movable bolt contacts the end of the second valve cover away from the second flange.

[0013] Furthermore, a sewage outlet is provided below the detection chamber, the sewage outlet is located outside the auxiliary valve body, and the internal thread of the sewage outlet is sealed and connected to the third screw plug.

[0014] The cutting mechanism is applied to an auxiliary valve for detecting an online ventilation valve as described in any of the above items, and includes: a sealing pressure plate for cutting off the internal flow chamber of the auxiliary valve body, and the sealing pressure plate is sealed and matched in the detection chamber.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides an auxiliary valve for detecting an online ventilation valve, which can be connected between the ventilation valve and the storage tank, and is used for connecting the ventilation valve and the storage tank during normal operation; when the ventilation valve needs to be detected, a cutting mechanism for cutting off the internal flow chamber of the auxiliary valve body can be connected into the detection chamber, thereby separating the flow chamber of the auxiliary valve body, thereby cutting off the connection between the storage tank and the ventilation valve, so that the ventilation valve can be detected without being disassembled, thereby solving the problems of long maintenance cycle, high cost, parts and debris falling into the storage tank, and valves being easily dropped during hoisting, etc. in the existing ventilation valve detection method.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of a first solution of an auxiliary valve for detecting an online ventilation valve provided in an embodiment of the utility model Figure 1 ;

[0020] Figure 2 A schematic diagram of a first solution of an auxiliary valve for detecting an online ventilation valve provided in an embodiment of the utility model Figure 2 ;

[0021] Figure 3 A schematic diagram of a second solution of an auxiliary valve for detecting an online ventilation valve provided in an embodiment of the utility model Figure 1 ;

[0022] Figure 4 A schematic diagram of a second solution of an auxiliary valve for detecting an online ventilation valve provided in an embodiment of the utility model Figure 2 ;

[0023] Figure 5 A schematic diagram of a second valve cover of a second solution of an auxiliary valve for detecting an online ventilation valve provided in an embodiment of the utility model;

[0024] Figure 6 A schematic diagram of a second flange of a second solution of an auxiliary valve for detecting an online ventilation valve provided in an embodiment of the utility model;

[0025] Figure 7 A schematic diagram of the connection between the jack-type cut-off assembly and the auxiliary valve body provided in an embodiment of the utility model.

[0026] Icons: valve connecting flange 1; tank connecting flange 4; inspection chamber 7; direction sign 10; fastener 11; first flange 12; gasket 13; first valve cover 14; handle 15; auxiliary valve body 16; support bolt 17; fixing plate 19; shaft 20; joint bolt 21; second flange 22; second valve cover 23; guide rail 24; upper sealing pressure plate 25; hydraulic jack 26; lower sealing pressure plate 27; first loading and unloading handle 28; second loading and unloading handle 29. DETAILED DESCRIPTION

[0027] In order to clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention, it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0029] Embodiment 1

[0030] See also Figure 1-7The utility model provides an auxiliary valve for detecting an online ventilation valve, comprising: an auxiliary valve body 16 provided with a storage tank connection port and a ventilation valve connection port, a detection chamber 7 arranged on the auxiliary valve body 16 and located between the storage tank connection port and the ventilation valve connection port; a cut-off mechanism detachably connected in the detection chamber 7 for cutting off the internal flow chamber of the auxiliary valve body 16; and also comprising: a first interface and a second interface arranged on the auxiliary valve body 16; the first interface and the second interface are located on both sides of the detection chamber 7.

[0031] The working principle and technical effects of the above technical solution are as follows:

[0032] In an auxiliary valve for detecting an online ventilation valve of the utility model, a storage tank connecting port and a ventilation valve connecting port are provided on the auxiliary valve body 16, so that the auxiliary valve body 16 can be connected between the ventilation valve and the storage tank. During normal operation, a cutting mechanism is not installed in the detection chamber 7, and the auxiliary valve body 16 is used for connecting the ventilation valve and the storage tank. When the ventilation valve needs to be detected, a cutting mechanism for cutting off the internal flow chamber of the auxiliary valve body 16 can be connected to the detection chamber 7, thereby separating the flow chamber of the auxiliary valve body. At this time, the connection between the storage tank and the ventilation valve is cut off, and then the first interface and the second interface are connected to the detection equipment for detection, which is convenient for connecting the detection equipment, thereby realizing online detection without removing the ventilation valve from the storage tank, solving the problems of long maintenance cycle, high cost, parts and debris falling into the storage tank, and easy falling of the valve during hoisting in the existing ventilation valve detection method.

[0033] Embodiment 2

[0034] See also Figure 1-7 On the basis of the first embodiment, a tank connection flange 4 is provided at the tank connection port of the auxiliary valve body 16, and a second interface is arranged at the side of the tank connection flange 4 and communicated with the flow chamber of the auxiliary valve body 16; the second interface is sealed and connected to the second screw plug through an internal thread. A valve connection flange 1 is provided at the ventilation valve connection port of the auxiliary valve body 16; the first interface is arranged at the side of the valve connection flange 1 and communicated with the flow chamber of the auxiliary valve body 16; the first interface is sealed and connected to the first screw plug through an internal thread. The first interface and the second interface are arranged on the same side. One end of the detection chamber 7 is a closed end and the other end is an open end; the open end of the detection chamber 7 is connected to a valve cover structure for opening or closing the detection chamber 7; a sewage outlet is provided below the detection chamber 7, and the sewage outlet is located outside the auxiliary valve body 16, and the sewage outlet is sealed and connected to the third screw plug through an internal thread. A direction sign 10 is provided on the auxiliary valve body 16 to clarify the installation direction.

[0035] The working principle and technical effects of the above technical solution are as follows:

[0036] In the auxiliary valve for detecting an online ventilation valve of the utility model, by setting a storage tank connecting flange 4 and a valve connecting flange 1, it is convenient to quickly connect the auxiliary valve body 16 to the storage tank and the ventilation valve, a first interface is provided on the valve connecting flange 1, and a second interface is provided on the storage tank connecting flange 4. When working normally, the first interface and the second interface are blocked with a first screw plug and a second screw plug respectively. When inspecting, the first screw plug and the second screw plug are removed to connect with the detection equipment. The first interface and the second interface are arranged on the same side, which is convenient for quickly connecting the detection equipment during detection. When working normally, the valve cover structure is blocked in the detection chamber The open end of 7 is used to close the detection chamber 7, and the sewage outlet is blocked with a third screw plug. During maintenance, the third screw plug is first unscrewed to discharge the accumulated liquid through the sewage outlet to prevent the accumulated liquid inside the detection chamber 7 from affecting the detection accuracy. Then the valve cover structure on the detection chamber 7 is opened to install the cutting mechanism. In the utility model, there are multiple positions of the first interface and the second interface. The first setting position is as follows: the first interface and the second interface are respectively arranged on the valve connecting flange 1 and the tank connecting flange 4; the second setting position is as follows: the first interface and the second interface are arranged on the auxiliary valve body 16, and the setting can be selected according to the actual situation.

[0037] Embodiment 3

[0038] See also Figure 1-7 On the basis of the second embodiment, the utility model provides a technical solution of a first valve cover structure, in which the valve cover structure includes a first valve cover 14, which is connected to a first flange 12 at the open end of the detection chamber 7 through a fastener 11; a gasket 13 is provided between the first flange 12 and the first valve cover 14, and a handle 15 is provided on the first valve cover 14 to facilitate the loading and unloading of the first valve cover 14.

[0039] The working principle and technical effects of the above technical solution are as follows:

[0040] In the auxiliary valve for detecting an online ventilation valve of the utility model, in normal operation, the valve cover structure is blocked at the open end of the detection chamber 7. At this time, the first valve cover 14 is sealed and connected to the first flange 12 at the open end of the detection chamber 7 through a fastener 11. The fastener 11 can be a bolt. A gasket 13 is provided between the first flange 12 and the first valve cover 14, which is conducive to improving the sealing of the connection between the two.

[0041] When the ventilation valve needs to be inspected, the valve cover structure is released from the open end of the inspection chamber 7, and the fastener 11 is removed to separate the first valve cover 14 from the first flange 12. At this time, it is convenient to install a cutting mechanism for cutting off the internal flow chamber of the auxiliary valve body 16.

[0042] Embodiment 4

[0043] See also Figure 1-7On the basis of the second embodiment, the utility model provides a technical solution of a second valve cover structure, in which a second flange 22 is provided at the open end of the detection chamber 7, a bolt hole is provided at the lower end of the second flange 22, a support bolt 17 is threadedly connected in the bolt hole, and a first U-shaped groove is provided at the upper end of the second flange 22; a fixing plate 19 is fixedly connected to the upper part of the detection chamber 7, a shaft 20 is rotatably connected to the fixing plate 19, and one end of a live bolt 21 is rotatably connected to the shaft 20; the valve cover structure includes a second valve cover 23, and second U-shaped grooves are provided at both upper and lower ends of the second valve cover 23, the second U-shaped groove at the lower end of the second valve cover 23 is clamped on the support bolt 17, the live bolt 21 is clamped in the second U-shaped groove at the upper end of the second valve cover 23, and a nut threadedly connected to the live bolt 21 abuts against an end of the second valve cover 23 away from the second flange 22.

[0044] The working principle and technical effects of the above technical solution are as follows:

[0045] In the auxiliary valve for detecting an online ventilation valve of the utility model, during normal operation, the valve cover structure is installed to block the open end of the detection chamber 7. In the technical scheme of the second valve cover structure, as shown in FIG. Figure 4 As shown, the shaft 20 is connected to the fixing plate 19, and the fixing plate 19 is connected above the detection chamber 7. The fixing plate 19 and the detection chamber 7 are preferably welded and connected, and the structural strength is high. Two fixing plates 19 are preferably provided, and the two ends of the shaft 20 are connected to the two fixing plates 19, and the support stability is good. The shaft 20 and the fixing plate 19 can be fixedly connected, such as welding, or can be movably connected, such as: nuts, cotter pins, etc., to achieve relative fixation; one end of the movable bolt 21 is rotatably connected to the shaft 20 so that it can rotate around the shaft 20. When installing the second valve cover 23, first insert the bolt 17 into the bolt hole at the lower end of the second flange 22, and then clamp the second valve cover 23 in the bolt hole through the second U-shaped groove at its lower end. The bolt 17 is then rotated onto the movable bolt 21 to the second U-shaped groove at the upper end of the second valve cover 23 and the first U-shaped groove at the upper end of the second flange 22. The first U-shaped groove and the second U-shaped groove are arranged opposite to each other. The nut on the movable bolt 21 is then rotated so that the nut is pressed against the side surface of the second valve cover 23 away from the second flange 22, and the bolt 17 can be rotated to lock the lower end of the second valve cover 23 to ensure the stable connection of the second valve cover 23. When disassembling the second valve cover 23, the bolt 17 is removed so that the nut releases the obstruction to the second valve cover 23, and the movable bolt 21 is rotated to disengage it from the second U-shaped groove at the upper end of the second valve cover 23 and the first U-shaped groove at the upper end of the second flange 22, so that the installation of the second valve cover 23 is easier and more labor-saving.

[0046] Embodiment 5

[0047] See also Figure 1-7The utility model also discloses a first technical solution of a cutting mechanism, which is applied to an auxiliary valve for detecting an online ventilation valve as described in any one of the above items, and includes: a sealing plate for cutting off the internal flow chamber of the auxiliary valve body 16, and the sealing plate is sealed and matched in the detection chamber 7. The sealing plate is sealed and installed in the detection chamber 7, and the internal flow chamber of the auxiliary valve body 16 is effectively cut off, thereby cutting off the connection between the ventilation valve and the storage tank.

[0048] Embodiment 6

[0049] See also Figure 7 The utility model also discloses a second technical solution of a cutting mechanism, in which the cutting mechanism includes a jack-type cutting assembly, which includes: an upper sealing plate 25, a hydraulic jack 26, a lower sealing plate 27, a first loading and unloading handle 28 and a second loading and unloading handle 29; an upper sinking groove for clamping and matching the upper end of the hydraulic jack 26 is provided on the lower surface of the upper sealing plate 25, and the first loading and unloading handle 28 is fixedly connected to the side of the upper sealing plate 25; a lower sinking groove for clamping and matching the lower end of the hydraulic jack 26 is provided on the upper surface of the lower sealing plate 27, and the positioning and installation of the hydraulic jack 26 is achieved through the cooperation of the lower sinking groove and the upper sinking groove, and the second loading and unloading handle 29 is fixedly connected to the side of the lower sealing plate 27, and the cooperation of the second loading and unloading handle 29 and the first loading and unloading handle 28 facilitates the control of the jack-type cutting assembly. The parts are installed in the detection chamber 7; a sealing material layer is provided on the upper surface of the upper sealing pressure plate 25 and the lower surface of the lower sealing pressure plate 27, or a sealing material layer is provided on the entire surface of the upper sealing pressure plate 25 and the entire surface of the lower sealing pressure plate 27, so as to further improve the sealing effect; the material of the upper sealing pressure plate 25 and the lower sealing pressure plate 27 can be selected as fluoroplastic as a whole, which makes the overall weight lighter and more labor-saving when installing and carrying; the upper end of the hydraulic jack 26 is matched and arranged in the sink groove on the lower surface of the upper sealing pressure plate 25, and the lower end of the hydraulic jack 26 is matched and arranged in the sink groove on the upper surface of the lower sealing pressure plate 27; the detection chamber 7 is provided with a guide rail 24 for matching the installation of the upper sealing pressure plate 25, and the lower surface of the upper sealing pressure plate 25 can be slidably arranged on the upper surface of the guide rail 24 to improve the stability and accuracy of the upper sealing pressure plate 25 being loaded into the detection chamber 7.

[0050] When testing the ventilation valve, unscrew the third screw plug to discharge the accumulated liquid. When the accumulated liquid is drained, unscrew the first screw plug and the second screw plug, connect the testing equipment to the first interface and the second interface, remove the fastener 11, remove the first valve cover 14, and place the hydraulic jack 26 in the sink groove on the lower sealing pressure plate 27. The sink groove of the lower sealing pressure plate 27 limits the position of the hydraulic jack 26. Then, the lower sealing pressure plate 27 and the hydraulic jack 26 are pushed into the testing chamber 7 together through the second loading and unloading handle 29, and the position of the lower sealing pressure plate 27 is limited by the side plate of the testing chamber 7, and then the upper sealing pressure plate 25 is pushed into the testing chamber 7 along the top of the guide rail 24. The installation is convenient, time-saving and labor-saving. After the installation is completed, the liquid is charged through the charging device. The pressure jack 26 is pressed to increase the pressure. The hydraulic jack 26 lifts up the upper sealing pressure plate 25, so that the upper sealing pressure plate 25 and the lower sealing pressure plate 27 are respectively blocked at the upper connecting port and the lower connecting port between the detection chamber 7 and the auxiliary valve body 16, and the connection between the ventilation valve and the storage tank is cut off. Then, the detection is carried out. After the detection, if there is a problem, the valve can be repaired directly online. During the maintenance, there is no risk of foreign matter falling into the storage tank. After the maintenance, the hydraulic jack 26 is controlled to release the pressure back to its position, and the upper sealing pressure plate 25 is taken out by hand by pulling the first loading and unloading handle 28, and then the hydraulic jack 26 and the lower sealing pressure plate 27 are taken out in turn. Then, the first valve cover 14, the first screw plug, the second screw plug and the third screw plug are installed, and the production operation can be resumed.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An auxiliary valve for detecting an online ventilation valve, characterized in that: include: An auxiliary valve body (16) is provided with a storage tank connection port and a ventilation valve connection port, wherein a detection chamber (7) arranged on the auxiliary valve body (16) is located between the storage tank connection port and the ventilation valve connection port; and a cut-off mechanism for cutting off the internal flow chamber of the auxiliary valve body (16) is detachably connected in the detection chamber (7).

2. The auxiliary valve for detecting an online ventilation valve according to claim 1, characterized in that: Also includes: A first interface and a second interface are arranged on the auxiliary valve body (16); the first interface and the second interface are located on both sides of the detection chamber (7).

3. The auxiliary valve for detecting an online ventilation valve according to claim 2, characterized in that: A tank connection flange (4) is provided at the tank connection port of the auxiliary valve body (16); a second interface is provided on the side of the tank connection flange (4) and is communicated with the flow chamber of the auxiliary valve body (16); the second interface is internally threaded and sealed to connect with a second screw plug.

4. The auxiliary valve for detecting an online ventilation valve according to claim 3, characterized in that: A valve connection flange (1) is provided at the ventilation valve connection port of the auxiliary valve body (16); a first interface is arranged on the side of the valve connection flange (1) and is connected to the flow chamber of the auxiliary valve body (16); the first interface is internally threaded and sealed to a first screw plug.

5. The auxiliary valve for detecting an online ventilation valve according to claim 4, characterized in that: The first interface and the second interface are arranged on the same side.

6. The auxiliary valve for detecting an online ventilation valve according to claim 1, characterized in that: One end of the detection chamber (7) is a closed end, and the other end is an open end; the open end of the detection chamber (7) is connected to a valve cover structure for opening or closing the detection chamber (7).

7. The auxiliary valve for detecting an online ventilation valve according to claim 6, characterized in that: The valve cover structure comprises a first valve cover (14), which is connected to a first flange (12) at the open end of the detection chamber (7) via a fastener (11); a gasket (13) is provided between the first flange (12) and the first valve cover (14).

8. The auxiliary valve for detecting an online ventilation valve according to claim 6, characterized in that: The open end of the detection chamber (7) is provided with a second flange (22), the lower end of the second flange (22) is provided with a bolt hole, the inner thread of the bolt hole is connected to the support bolt (17), and the upper end of the second flange (22) is provided with a first U-shaped groove; the upper part of the detection chamber (7) is connected to a fixing plate (19), the fixing plate (19) is connected to a shaft (20), and one end of the movable bolt (21) is rotatably connected to the shaft (20); the valve cover structure comprises a second valve cover (23), the upper and lower ends of the second valve cover (23) are provided with second U-shaped grooves, the second U-shaped groove at the lower end of the second valve cover (23) is clamped on the support bolt (17), the movable bolt (21) is clamped in the second U-shaped groove at the upper end of the second valve cover (23), and the nut threadedly connected to the movable bolt (21) abuts against the end of the second valve cover (23) away from the second flange (22).

9. The auxiliary valve for detecting an online ventilation valve according to claim 6, characterized in that: A sewage outlet is provided below the detection chamber (7), the sewage outlet is located outside the auxiliary valve body (16), and the internal thread of the sewage outlet is sealed and connected to a third screw plug.

10. A cut-off mechanism, applied to an auxiliary valve for detecting an online ventilation valve according to any one of claims 1 to 9, characterized in that: include: A sealing pressure plate is used to cut off the internal flow chamber of the auxiliary valve body (16), and the sealing pressure plate is sealingly fitted in the detection chamber (7).

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