Two-valve-group gauge valve

Abstract

A two-valve-group instrument valve comprises a valve seat, a conical flow cavity and a dirt collecting groove are integrally formed in the valve seat, and the dirt collecting groove is connected to the conical flow cavity through a pipeline and is in threaded connection with a plug. The first port is fixedly connected to the valve seat; the second port is fixedly connected to the valve seat and located on the side, away from the first port, of the valve seat. Wherein the first port and the second port penetrate through the valve seat to form a main valve path, the conical flow cavity is connected with the main valve path through a pipeline, the conical flow cavity is gradually shrunk from the joint of the conical flow cavity and the main valve path to the sewage collecting groove, liquid is injected into the first port, and the conical flow cavity is communicated with the sewage collecting groove. The liquid sequentially passes through the main valve path and the conical flow cavity to enter the dirt collecting groove, the plug is detached, and the liquid in the dirt collecting groove is discharged out of the valve seat.

Description

Technical Field

[0001] This utility model relates to the field of pipeline valve structure, and in particular to a two-valve manifold instrument valve. Background Technology

[0002] A two-valve manifold is a valve assembly widely used in industrial process control. It typically consists of two shut-off valves and is used to connect instrumentation equipment such as pressure gauges and transmitters to process piping. By independently operating the two valves, the manifold allows for the connection or isolation of the instrumentation from the process piping.

[0003] Currently, in the chemical industry, when conveying corrosive media such as acids and alkalis, residual liquid in instrument two-valve manifolds can remain in the dead corners of the valve cavity for extended periods after the valve manifold is closed. This residual liquid can react chemically with the valve body's metal materials (such as carbon steel), leading to particle crystal accumulation (such as salt precipitation), clogging the flow channels, and affecting the accuracy of instrument measurements. Furthermore, when conveying highly adhesive liquid media, the media easily adheres to the inner wall of the valve cavity, forming residual stains that may solidify and clog the flow channels, reducing valve conveying efficiency or even causing the valve to jam.

[0004] Therefore, it is necessary to provide a two-valve manifold instrument valve that can effectively clean the valve passage and effectively collect residual dirt in the valve passage. Utility Model Content

[0005] The purpose of this invention is to provide a two-valve instrument valve that can effectively clean valve passages and effectively collect residual dirt in valve passages.

[0006] According to one aspect of this application, a two-valve manifold instrument valve is provided, the instrument valve comprising:

[0007] A valve seat, wherein a conical flow cavity is integrally formed inside the valve seat and a pipe is connected to the conical flow cavity, and a sludge collection groove with a plug is threadedly connected thereto;

[0008] The first port is fixedly connected to the valve seat;

[0009] The second port is fixedly connected to the valve seat and is located on the side of the valve seat opposite to the first port;

[0010] A main valve path is formed through the valve seat along the first port and the second port. The conical flow cavity is connected to the main valve path pipeline and gradually narrows from the connection with the main valve path to the sludge collection tank. Liquid is injected into the first port, and the liquid sequentially passes through the main valve path and the conical flow cavity into the sludge collection tank. The plug is removed, and the liquid in the sludge collection tank is discharged out of the valve seat.

[0011] More preferably, the valve seat surface is also integrally formed with a first external port and a second external port located on the side of the valve seat opposite to the first external port;

[0012] The first external port and the second external port are threaded inside and are respectively connected to the main valve pipeline.

[0013] More preferably, the valve seat also integrally forms a first flow-blocking channel located between the first external port and the main valve line, and a second flow-blocking channel located between the second external port and the main valve line.

[0014] More preferably, the instrument valve further includes:

[0015] The first shut-off valve is fixedly connected to the first external port;

[0016] The second shut-off valve is fixedly connected to the second external port and is located on the side of the valve seat opposite to the first shut-off valve.

[0017] More preferably, the first shut-off valve includes:

[0018] The first pair of connectors has external threads, and the first pair of connectors is threadedly connected to the first external port.

[0019] The first rotating handle is fixedly connected to the first connector and is located on the side of the first connector opposite to the first external port.

[0020] More preferably, the first shut-off valve further includes:

[0021] The first throttle rod is fixedly connected to the first connector and is located on the side of the first connector away from the first handle;

[0022] When the first handle is rotated, the first throttling rod moves along the first throttling channel. When the first throttling rod abuts against the main valve, it blocks the liquid in the main valve.

[0023] More preferably, the second shut-off valve includes:

[0024] The second pair of connectors has external threads, and the second pair of connectors is threadedly connected to the second external port;

[0025] The second handle is fixedly connected to the second connector and is located on the side of the second connector opposite to the second external port.

[0026] More preferably, the second shut-off valve further includes:

[0027] The second cutoff rod is fixedly connected to the second pair of connectors and is located on the side of the second pair of connectors away from the second rotating handle;

[0028] When the second handle is rotated, the second throttling rod moves along the second throttling channel. When the second throttling rod abuts against the main valve, it also blocks the liquid in the main valve.

[0029] More preferably, when liquid is injected into the first port, if the first throttling rod does not abut against the main valve and the second throttling rod abuts against the main valve, the liquid enters the conical flow cavity and then enters the sludge collection tank through the conical flow cavity.

[0030] More preferably, the plug is provided with a sealing ring, and when the plug is threaded into the sludge collection tank, the sealing ring abuts against the surface of the valve seat.

[0031] This utility model has the following beneficial effects:

[0032] The liquid flows sequentially through the main valve path and the conical flow chamber into the sludge collection tank. The plug is then removed, allowing the liquid in the sludge collection tank to drain out of the valve seat. Contaminants in the main valve path are carried to the sludge collection tank and discharged, effectively cleaning the interior of the instrument valve. The design, with the narrow end of the conical flow chamber connected to the sludge collection tank, ensures that contaminants inside the instrument valve are stored in the sludge collection tank and are less likely to flow back into the main valve path, effectively collecting residual contaminants from the main valve path. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a three-dimensional structural diagram of the instrument valve described in one embodiment of this application;

[0035] Figure 2 As described in one embodiment of this application Figure 1 A cross-sectional view of the inner edge cutting line AA;

[0036] Figure 3 As described in one embodiment of this application Figure 2 A schematic diagram illustrating the principle of liquid flow within the container;

[0037] Explanation of reference numerals: 100, Instrument valve; 10, Valve seat; 11, Conical flow chamber; 12, Sludge collection tank; 13, Main valve path; 14, First external port; 15, Second external port; 16, First throttling channel; 17, Second throttling channel; 20, First port; 30, Second port; 40, Plug; 41, Sealing ring; 50, First shut-off valve; 51, First connector; 52, First handle; 53, First throttling rod; 60, Second shut-off valve; 61, Second connector; 62, Second handle; 63, Second throttling rod. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] Please refer to Figure 1 - Figure 3 One embodiment of this application provides a two-valve manifold instrument valve 100, which includes a valve seat 10, a first port 20, and a second port 30.

[0042] The valve seat 10 has an integrally formed conical flow cavity 11 and a pipe connected to the conical flow cavity 11, and a sludge collection tank 12 threadedly connected to a plug 40; the first port 20 is fixedly connected to the valve seat 10. The second port 30 is fixedly connected to the valve seat 10 and is located on the side of the valve seat 10 opposite to the first port 20. A main valve passage 13 is formed through the valve seat 10 along the first port 20 and the second port 30. The conical flow cavity 11 is connected to the main valve passage 13 and gradually narrows from the connection with the main valve passage 13 towards the sludge collection tank 12. Liquid is injected into the first port 20, and the liquid sequentially passes through the main valve passage 13 and the conical flow cavity 11 into the sludge collection tank 12. After removing the plug 40, the liquid in the sludge collection tank 12 is discharged out of the valve seat 10.

[0043] The conical flow cavity 11, through its fluid acceleration and inertial separation effect, automatically guides particles, condensate, and other impurities in the medium to the collection tank 12, preventing impurities from entering the core components of the main valve 13. This reduces wear, jamming, and leakage risks, extending the overall service life of the valve. Continuous impurity removal prevents downstream equipment (such as flow meters and sensors) from experiencing performance degradation or malfunctions due to impurity accumulation, ensuring stable operation of the process. The collection tank 12 is independent of the main valve 13 and is quickly opened and closed via a threaded plug 40, allowing for impurity removal without interrupting the process, significantly reducing maintenance downtime and costs. The sealing structure of the plug 40 ensures no media leakage during drainage, guaranteeing operational safety and environmental compliance. The main valve 13, as a straight-through flow channel, minimizes media flow resistance, ensuring efficient media transmission. Its bidirectional flow support capability allows the valve to flexibly adapt to different process requirements (such as forward conveying and reverse flushing), enabling functional expansion without additional modifications. The velocity gradient change (acceleration of the medium within the conical cavity) enhances impurity separation efficiency, ensuring the main valve 13 remains clean over the long term. The dual sealing mechanism of thread preload and sealing ring 41 ensures that the sludge collection tank 12 is leak-free under high pressure, high temperature or corrosive media environments, thus guaranteeing process safety and environmental compliance.

[0044] More preferably, the valve seat 10 also has a first external port 14 and a second external port 15 integrally formed on its surface, located on the side of the valve seat 10 opposite to the first external port 14. The first external port 14 and the second external port 15 are internally threaded and are respectively connected to the main valve passage 13 pipeline.

[0045] Instrument valve 100 typically needs to be connected to process piping or monitoring equipment (such as pressure gauges and transmitters). An external port with threads allows for quick and reliable connection to external piping or instruments via threaded connection, ensuring installation versatility and standardization. The first and second external ports 15 are located at opposite ends of valve seat 10, allowing selection of the inlet / outlet direction and flexible adaptation to different layouts. A first shut-off valve 50 and a second shut-off valve 60 are configured at each port. By controlling these two shut-off valves, the main valve circuit 13 can be selectively opened / closed, achieving bidirectional fluid isolation. This design is ideal for instrument systems requiring regular maintenance, calibration, or drainage, allowing for independent shut-off of fluid in either direction, offering flexible operation and high safety. With only one external port, dead zones or incomplete liquid drainage can easily occur during cleaning or drainage. Having two external ports connected to the main valve circuit 13 allows for liquid inlet from one end and drainage from the other, or liquid injection from one end and closure from the other. The external port is integrally formed on the valve seat 10 and features a threaded connection, which reduces the need for welding or additional joints and lowers the risk of leakage. The valve seat 10 and the external port are integrally formed, resulting in higher strength, better overall pressure resistance and corrosion resistance, making it suitable for use in harsh environments.

[0046] More preferably, the valve seat 10 also integrally forms a first flow-blocking channel 16 located between the first external port 14 and the main valve passage 13, and a second flow-blocking channel 17 located between the second external port 15 and the main valve passage 13.

[0047] The flow-closing channel provides movement space for the flow-closing rods of the first and second shut-off valves 50 and 60. After the handle is rotated, the flow-closing rod advances along the flow-closing channel and eventually abuts against the main valve passage 13 to close the fluid passage. Without a dedicated flow-closing channel, the flow-closing rod cannot be properly guided or moved, and the on / off of the fluid cannot be precisely controlled. The flow-closing channel plays a guiding and positioning role, ensuring the reliability and sealing of the shut-off action. The main valve passage 13 is the main fluid channel inside the entire valve body. The flow-closing channel connects the external port to the main valve passage 13, and a shut-off valve is set in the middle, which allows for convenient zoned management of the fluid. For example, only the fluid near the first external port 14 can be closed, or only the fluid near the second external port 15 can be closed, or both can be closed simultaneously to achieve complete isolation. If the external port is directly connected to the main valve passage 13 without a transitional flow-closing channel, the fluid can easily directly scour the shut-off element, leading to accelerated seal wear and shortened service life. With the flow cut-off channel, the fluid is buffered before entering the main valve passage 13, reducing flow velocity impact, improving flow field distribution, and making the valve seal more durable and reliable. Designing the flow cut-off channel as a one-piece structure, rather than separately opening, welding, or assembling, can avoid the risk of leakage at the connection, and can ensure smooth internal flow channels and reduce dead angles, so that the instrument valve 100 can maintain high sealing performance and high reliability even under long-term use.

[0048] More preferably, the instrument valve 100 further includes: a first shut-off valve 50 and a second shut-off valve 60.

[0049] The first shut-off valve 50 is fixedly connected to the first external port 14. The second shut-off valve 60 is fixedly connected to the second external port 15 and is located on the side of the valve seat 10 opposite to the first shut-off valve 50.

[0050] The first shut-off valve 50 and the second shut-off valve 60 are respectively installed on the first and second external ports 15, allowing for separate control of the fluid at both ends of the main valve circuit 13. By switching these two shut-off valves individually or simultaneously, single-sided closure (closing only the first shut-off valve 50 or the second shut-off valve 60) and simultaneous double-sided closure (completely isolating the main valve circuit 13) can be flexibly achieved, improving the flexibility and safety of fluid management. Especially during on-site maintenance, repair, and instrument replacement, only one or both sides of the medium can be cut off, ensuring operational safety. When the instrument valve 100 needs cleaning or drainage, only one side (such as the second shut-off valve 60) can be closed, and cleaning fluid can be injected from the first port 20 to flush the main valve circuit 13 and the conical flow chamber 11, finally flowing into the sludge collection tank 12. If only one shut-off valve is used, these selective operations cannot be performed, and the efficiency of drainage and flushing will be limited. If the fluid direction in the system may change (such as some processes requiring reverse purging), this dual shut-off valve design can be adapted. Regardless of which end the fluid flows in from, it can be controlled by the nearest shut-off valve, increasing its versatility.

[0051] More preferably, the first shut-off valve 50 includes: a first coupling 51 and a first rotary handle 52.

[0052] The first connector 51 has external threads and is threaded to the first external port 14. The first rotating handle 52 is fixedly connected to the first connector 51 and is located on the side of the first connector 51 opposite to the first external port 14.

[0053] The first connector 51 has external threads, allowing it to be securely screwed into the first external port 14 (which has internal threads), forming a robust and vibration-resistant connection. The threaded connection can also be used with a sealing ring 41 or a conical surface to meet sealing requirements under high-pressure environments, preventing media leakage. This ensures the gate valve can operate safely and securely even under harsh conditions such as high pressure, high vibration, and corrosive environments. The first handle 52 is located on the side of the connector opposite to the external port, effectively extending to the outside of the valve. Operators can easily rotate the handle by hand without contacting the pipe or valve seat 10. This ergonomic design avoids danger or inconvenience caused by proximity to high-temperature, high-pressure fluids, improving operational safety and convenience, and is suitable for installation in compact spaces or high-temperature environments. The first handle 52 is directly fixed to the first connector 51, effectively driving the entire gate valve's opening and closing action. The rotation of the handle drives the subsequent throttling rod through the connector, and the rigid connection, without intermediate flexible parts, ensures rapid response and precise control.

[0054] More preferably, the first shut-off valve 50 further includes a first throttling rod 53. The first throttling rod 53 is fixedly connected to the first connector 51 and is located on the side of the first connector 51 opposite to the first rotating handle 52. When the first rotating handle 52 is rotated, the first throttling rod 53 moves along the first throttling channel 16. When the first throttling rod 53 abuts against the main valve passage 13, the first throttling rod 53 blocks the liquid in the main valve passage 13.

[0055] The first shut-off rod 53 is directly inserted into the first shut-off channel 16, and it moves axially forward or backward as the first handle 52 rotates (through the connector). When the first shut-off rod 53 reaches the contact point with the main valve passage 13, it physically cuts off the liquid flow in the main valve passage 13, much like blocking a water pipe. This simple mechanical action achieves fast and reliable fluid shut-off control. The first shut-off rod 53 is fixedly connected to the first connector 51 (rather than loosely connected), so that when the handle is rotated, the entire connector and shut-off rod move in unison, preventing delays, slippage, or asynchronous movements. Compared to complex mechanisms such as intermediate transmission components and connecting rods, the fixed connection structure is simpler and has a lower failure rate. This ensures precise opening and closing actions, rapid response, and improved stability during long-term valve use. The position of the shut-off rod close to the fluid end separates the handle rotation space from the shut-off action space. This not only reduces structural interference but also facilitates installation in equipment with dense piping and limited space. The flow-stopping rod moves linearly along a specially designed flow-stopping channel, with a controlled movement path that prevents deviation or jamming. Upon reaching the main valve 13, it can be designed with metal-to-metal contact or a sealing gasket to create a good seal and ensure zero or minimal leakage after shut-off.

[0056] More preferably, the second shut-off valve 60 includes: a second connector 61 and a second handle 62.

[0057] The second connector 61 has external threads and is threaded to the second external port 15. The second handle 62 is fixedly connected to the second connector 61 and is located on the side of the second connector 61 opposite to the second external port 15.

[0058] The second connector 61 has external threads that screw directly into the second external port 15, ensuring a stable and reliable connection between the second shut-off valve 60 and the valve seat 10. This connection can withstand internal liquid pressure and prevent leakage. The threaded connection also facilitates quick on-site assembly and disassembly. If maintenance or replacement of the second shut-off valve 60 is required, simply loosen the threads, simplifying maintenance. This ensures a secure connection and reliable sealing, while also facilitating installation and maintenance. The second handle 62 is fixed to the second connector 61, allowing the operator to manually rotate it to control the valve's opening and closing. Located on the side opposite to the external port, avoiding the pipe connection area, it allows for easy rotation by the operator, without being limited by installation space. This makes operation convenient and intuitive, and the operating area does not interfere with the pipe connection area, improving safety and convenience.

[0059] More preferably, the second shut-off valve 60 further includes a second throttling rod 63.

[0060] The second shut-off rod 63 is fixedly connected to the second connector 61 and is located on the side of the second connector 61 opposite to the second handle 62. When the second handle 62 is rotated, the second shut-off rod 63 moves along the second shut-off channel 17. When the second shut-off rod 63 abuts against the main valve passage 13, the second shut-off rod 63 also blocks the liquid in the main valve passage 13.

[0061] The second shut-off rod 63 is fixed to the second connector 61. When the operator rotates the second handle 62, the second shut-off rod 63 moves axially. This design, where rotation is converted into linear motion, is very common in gate valves. It can precisely control the flow of fluid, and the operation is smooth and the sealing is good. A simple rotation allows for precise control of the main valve 13. When the second shut-off rod 63 is fully pushed in and abuts against the main valve 13, it effectively blocks the continued flow of fluid. This allows for independent isolation of the second-side connection system. For example, during maintenance, purging, or testing, it does not affect the operation of other parts of the overall system, achieving reliable local flow path isolation and improving maintenance safety and flexibility. The second shut-off rod 63 is fixedly connected to the second connector 61, meaning that the shut-off rod moves with each rotation of the handle, preventing loosening or malfunction. This rigid connection ensures direct and rapid operation with a low failure rate, making it suitable for harsh working conditions. The shut-off channel acts as a guide, effectively extending the service life of the gate valve while improving the sealing effect during shutdown and reducing the risk of leakage.

[0062] More preferably, when liquid is injected into the first port 20, if the first throttling rod 53 does not abut against the main valve 13 and the second throttling rod 63 abuts against the main valve 13, the liquid enters the conical flow cavity 11 and then enters the sludge collection tank 12 through the conical flow cavity 11.

[0063] When the first shut-off rod 53 is open (not blocking the main valve passage 13) and the second shut-off rod 63 is closed (blocking the main valve passage 13), the liquid injected from the first port 20 cannot flow directly out of the second port 30 through the main valve passage 13. Therefore, it can only be guided into the conical flow cavity 11. The conical flow cavity 11 is designed as a path to collect liquid impurities or flushing fluid, and the liquid eventually flows to the sludge collection tank 12. This setting allows the injected liquid to be used specifically for flushing internal channels or cleaning residues, without entering subsequent systems or external pipelines, ensuring system cleanliness. The liquid is specifically guided for flushing or drainage to ensure internal cleanliness. The second shut-off rod 63 blocks the main valve passage 13 to ensure that the injected liquid does not flow directly to external equipment or pipelines, avoiding the carry-out of dirt, particles, residual liquid, etc., which could contaminate subsequent systems. This is particularly suitable for precision instruments and sensor front-ends, preventing contamination of the external environment or important equipment during flushing. It protects downstream equipment and prevents the spread of pollution. The conical flow cavity 11 guides the flow, improving drainage efficiency. The conical flow cavity 11 is a structure that gradually narrows from the interface connecting to the main valve line 13 towards the sludge collection tank 12. This conical design can concentrate the direction and speed of liquid flow, accelerate the flushing process, and reduce dead zones where liquid stagnates in the cavity. The conical flow cavity 11 can also guide sediment and impurities to flow smoothly into the sludge collection tank 12, improving the thoroughness of cleaning. The liquid is finally concentrated in the sludge collection tank 12, which has a removable plug 40 (with a sealing ring 41). Removing the plug 40 allows for easy discharge of flushing fluid or sludge, avoiding the need to disassemble the entire valve or connecting pipe, greatly improving maintenance convenience.

[0064] More preferably, the plug 40 is provided with a sealing ring 41, and when the plug 40 is threadedly connected to the sludge collection tank 12, the sealing ring 41 abuts against the surface of the valve seat 10.

[0065] The sealing ring 41 is provided, and the sealing mainly relies on the compression of the flexible sealing ring 41. The thread only plays a mechanical fixing role. In this way, the plug 40 can be frequently disassembled and assembled without damaging the interface surface, extending its service life, protecting the valve seat 10 interface, and facilitating multiple disassembly and maintenance.

[0066] In this way, the liquid sequentially passes through the main valve passage 13 and the conical flow cavity 11 into the sludge collection tank 12. The plug 40 is then removed, allowing the liquid in the sludge collection tank 12 to drain out of the valve seat 10. The dirt in the main valve passage 13 is carried to the sludge collection tank 12 and discharged, effectively cleaning the interior of the instrument valve 100. The design of connecting the narrow end of the conical flow cavity 11 to the sludge collection tank 12 ensures that dirt inside the instrument valve 100 is stored in the sludge collection tank 12 and does not easily flow back into the main valve passage 13, effectively collecting residual dirt in the main valve passage 13.

[0067] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A two-valve manifold instrument valve, characterized in that, The instrument valve includes: A valve seat, wherein a conical flow cavity is integrally formed inside the valve seat and a pipe is connected to the conical flow cavity, and a sludge collection groove with a plug is threadedly connected thereto; The first port is fixedly connected to the valve seat; The second port is fixedly connected to the valve seat and is located on the side of the valve seat opposite to the first port; A main valve path is formed through the valve seat along the first port and the second port. The conical flow cavity is connected to the main valve path pipeline and gradually narrows from the connection with the main valve path to the sludge collection tank. Liquid is injected into the first port, and the liquid sequentially passes through the main valve path and the conical flow cavity into the sludge collection tank. The plug is removed, and the liquid in the sludge collection tank is discharged out of the valve seat.

2. The two-valve manifold instrument valve according to claim 1, characterized in that, The valve seat surface is also integrally formed with a first external port and a second external port located on the side of the valve seat opposite to the first external port; The first external port and the second external port are threaded inside and are respectively connected to the main valve pipeline.

3. A two-valve manifold instrument valve according to claim 2, characterized in that, The valve seat also integrally forms a first flow-blocking channel located between the first external port and the main valve path, and a second flow-blocking channel located between the second external port and the main valve path.

4. A two-valve manifold instrument valve according to claim 3, characterized in that, The instrument valve also includes: The first shut-off valve is fixedly connected to the first external port; The second shut-off valve is fixedly connected to the second external port and is located on the side of the valve seat opposite to the first shut-off valve.

5. A two-valve manifold instrument valve according to claim 4, characterized in that, The first shut-off valve includes: The first pair of connectors has external threads, and the first pair of connectors is threadedly connected to the first external port. The first rotating handle is fixedly connected to the first connector and is located on the side of the first connector opposite to the first external port.

6. A two-valve manifold instrument valve according to claim 5, characterized in that, The first shut-off valve further includes: The first throttle rod is fixedly connected to the first connector and is located on the side of the first connector away from the first handle; When the first handle is rotated, the first throttling rod moves along the first throttling channel. When the first throttling rod abuts against the main valve, it blocks the liquid in the main valve.

7. A two-valve manifold instrument valve according to claim 6, characterized in that, The second shut-off valve includes: The second pair of connectors has external threads, and the second pair of connectors is threadedly connected to the second external port; The second handle is fixedly connected to the second connector and is located on the side of the second connector opposite to the second external port.

8. A two-valve manifold instrument valve according to claim 7, characterized in that, The second shut-off valve also includes: The second cutoff rod is fixedly connected to the second pair of connectors and is located on the side of the second pair of connectors opposite to the second rotating handle; When the second handle is rotated, the second throttling rod moves along the second throttling channel. When the second throttling rod abuts against the main valve, it also blocks the liquid in the main valve.

9. A two-valve manifold instrument valve according to claim 8, characterized in that, When liquid is injected into the first port, if the first throttling rod does not abut against the main valve and the second throttling rod abuts against the main valve, the liquid enters the conical flow cavity and then enters the sludge collection tank through the conical flow cavity.

10. A two-valve manifold instrument valve according to claim 1, characterized in that, The plug is provided with a sealing ring. When the plug is threaded into the sludge collection tank, the sealing ring abuts against the surface of the valve seat.

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