A multifunctional valve device for heating, ventilation and plumbing

Abstract

The utility model relates to a heating and ventilation equipment pipeline technical field especially relates to a kind of multifunctional valve device for heating and ventilation pipeline, including valve body and the valve core subassembly being set in the valve body;The opposite sides of the valve body are respectively provided with water inlet and water outlet, the valve core subassembly is connected between the water inlet and water outlet, to adjust the medium flow from the water inlet into water outlet by valve core subassembly;Wherein, the side of the valve body is also provided with the temperature measuring hole being connected in the valve core subassembly, temperature probe is provided in the temperature measuring hole.The multifunctional valve device for heating and ventilation pipeline of the utility model can integrate fluid flow control function and fluid temperature measurement function in valve, to simplify the installation structure of heating and ventilation water system pipeline, and improve the accuracy and response speed of temperature measurement.

Description

Technical Field

[0001] This utility model relates to the field of HVAC equipment and piping technology, and in particular to a multifunctional valve device for HVAC pipelines. Background Technology

[0002] In modern building automation and HVAC systems, water-based central air conditioning systems are widely used due to their stable operation and flexible adjustment. In these systems, precisely controlling the flow rate of chilled or hot water through terminal devices (such as fan coil units and air handling units) is the core means of effectively regulating indoor ambient temperature. Electric water valves, as key actuators, are commonly installed on the inlet or outlet water lines of the terminal devices. Their opening, closing, or adjustment directly determines the flow rate of the medium through the heat exchange coils, thereby controlling the output of cooling or heating capacity.

[0003] With the continuous development of control technology, new-generation intelligent control algorithms, such as energy-saving control strategies based on variable water temperature and flow rate, place higher demands on the system's sensing capabilities. The implementation of these advanced algorithms often requires real-time and accurate acquisition of key operating parameters such as supply and return water temperatures, using these parameters as important input variables for valve opening adjustment to achieve on-demand cooling and heating, thereby optimizing system energy efficiency and improving indoor comfort.

[0004] To meet the aforementioned temperature monitoring requirements, two mainstream temperature measurement methods are commonly used in existing technologies. The first is to use a surface-mount temperature probe, which is fixed to the outer wall of the pipe by straps or clamps. The advantage of this method is that it is easy to install, requiring no modification to the existing pipeline or shutdown for drainage. However, its inherent drawbacks are also quite obvious: since heat needs to be conducted through the pipe wall, insulation layer (if any), and the contact interface between the probe and the pipe wall, there is significant thermal resistance and thermal delay, resulting in poor responsiveness of the measured value to changes in fluid temperature. The measurement accuracy is also easily affected by fluctuations in ambient temperature, making it difficult to meet the real-time and accuracy requirements of high-performance control systems.

[0005] The second method uses an insertion-type temperature probe, which involves directly inserting the probe into the pipe to contact the fluid. This method can directly measure fluid temperature, with accuracy and response speed far superior to surface-mounted probes. However, its installation process is quite cumbersome. The standard procedure is to first shut down the system, depressurize and drain the relevant pipe sections, then cut the pipe, install a dedicated tee fitting or a valve seat with a temperature sensing sleeve, before finally fixing the insertion probe in place. This process not only increases the cost of additional pipe fittings and installation labor, and prolongs the construction or renovation cycle, but also adds extra connection points to the pipeline, correspondingly increasing the risk of system leaks. Especially when retrofitting existing systems for energy conservation, this "wet work" requiring shutdown and drainage can seriously affect the normal operation of the building. Utility Model Content

[0006] To address the technical problems existing in the prior art, this utility model provides a multifunctional valve device for HVAC pipelines, which integrates fluid flow control and fluid temperature measurement functions into the valve, thereby simplifying the installation structure of HVAC water system pipelines and improving the accuracy and response speed of temperature measurement.

[0007] This utility model discloses a multifunctional valve device for HVAC pipelines, characterized in that it includes a valve body and a valve core assembly disposed within the valve body;

[0008] The valve body has an inlet and an outlet on opposite sides, and the valve core assembly is connected between the inlet and the outlet to regulate the flow rate of the medium flowing from the inlet to the outlet.

[0009] The valve body also has a temperature measuring hole on one side that is connected to the valve core assembly, and a temperature probe is installed in the temperature measuring hole.

[0010] Specifically, the basic structure of this utility model includes a valve body and a valve core assembly disposed inside the valve body. The valve body is the main supporting body and outer shell of the entire device, with an inlet and an outlet for media flow. These two openings are typically located on opposite sides of the valve body, jointly defining a main fluid channel running through the valve body. The valve core assembly, as the core control component, is installed in a receiving cavity inside the valve body, positioned precisely between the inlet and outlet, to connect or block the main fluid channel. By driving the valve core assembly through an external actuator or manual operation (e.g., a rotary ball valve or a lifting valve core), the flow rate of the medium (such as chilled water or hot water) from the inlet to the outlet can be precisely adjusted or closed, thereby controlling the cooling or heating supply to downstream equipment (such as fan coil units). In addition, the valve body features an innovative design: an additional temperature sensing port is provided on one side of the valve body. This temperature sensing port is not an isolated structure but is directly connected to the cavity inside the valve body that houses the valve core assembly. This connectivity allows the temperature sensing orifice to form a probe channel that can directly contact the medium within the main fluid flow path. Therefore, when a temperature probe is installed in this orifice, its sensing element can penetrate deep into the valve body and be directly immersed in the medium flowing around the valve core assembly, thus achieving real-time, direct measurement of the medium temperature. During the entire operation of the device, the valve core assembly is responsible for flow regulation, while the temperature probe in the orifice synchronously and at the same point monitors the temperature of the regulated medium. These two functions are highly integrated physically and tightly coupled functionally within the same valve body, ensuring that flow control actions and temperature feedback data are generated at the same point in the pipeline, providing timely and highly relevant input parameters for the precise control algorithm of the HVAC system.

[0011] According to the present invention, a multifunctional valve device for heating and ventilation pipes is provided, wherein the inner wall of the valve body is integrally provided with a first connecting thread at a position close to the inlet and outlet, and the inlet and outlet on both sides of the valve body are respectively connected to the heating and ventilation pipe through the first connecting thread.

[0012] According to the present invention, a multifunctional valve device for HVAC pipelines is provided on the outer wall of the valve body at positions close to the inlet and outlet, respectively, so as to turn the first connecting thread inside the valve body by means of the external octagonal nuts.

[0013] According to the present invention, a multifunctional valve device for heating and ventilation pipelines is provided, wherein the inner wall of the valve body is integrally formed with a second connecting thread inside the temperature measuring hole, and the inside of the temperature measuring hole is connected to a temperature probe through the second connecting thread.

[0014] According to the present invention, a multifunctional valve device for HVAC pipelines is provided inside the valve body for accommodating the valve core assembly;

[0015] The valve core assembly is integrally inserted into the valve body from the outlet and threadedly connected to the receiving cavity.

[0016] According to the present invention, a multifunctional valve device for heating and ventilation pipelines is provided, wherein the valve core assembly includes a ball valve and a valve core seat that is fitted and connected to the water inlets on opposite sides of the ball valve.

[0017] At least one side of the valve core seat has an external thread formed on its outer wall;

[0018] The valve core assembly is fixedly disposed in the receiving cavity by the mutual engagement of the external thread of the valve seat and the first connecting thread.

[0019] According to the present invention, a multifunctional valve device for heating and ventilation pipelines is provided on the valve core seat, on the side near the water outlet, an internal hexagonal through hole communicating with the ball valve;

[0020] The valve core seat is rotated by turning it through the internal hexagonal through hole, which in turn rotates the external thread of the valve seat.

[0021] According to the present invention, a multifunctional valve device for heating and ventilation pipelines is provided on the valve core seat on the side facing the receiving cavity;

[0022] The inner wall of the receiving cavity is formed with a limiting surface that abuts against and restricts the stepped surface, thereby defining the installation position of the valve core assembly within the receiving cavity through the limiting surface.

[0023] According to the present invention, a multifunctional valve device for heating and ventilation pipelines is provided on the valve body on the side opposite to the temperature measuring hole for connecting to an external valve core control mechanism.

[0024] The control rod of the external valve core control mechanism is adapted to be inserted into the operating port and driven to the ball valve inside the receiving cavity to control the rotation of the ball valve and regulate the medium flow rate;

[0025] The ball valve has a circular through hole that extends from the inlet to the outlet.

[0026] A shaped inlet hole is provided on the valve core seat near the water inlet side, which is connected to the circular through hole;

[0027] Furthermore, the irregular water inlet is composed of interconnected semi-circular holes and triangular holes, and the apex of the triangular hole is located on the rotation plane of the ball valve;

[0028] in:

[0029] As the ball valve rotates from the position of the semi-circular hole to the position of the triangular hole, the communication space between the circular through hole and the irregular water inlet hole decreases linearly, thereby controlling the water inlet flow of the valve body to decrease linearly.

[0030] As the ball valve rotates from the position of the triangular hole to the position of the semi-circular hole, the communication space between the circular through hole and the irregular water inlet hole increases linearly, thereby controlling the water inlet flow rate of the valve body to increase linearly.

[0031] According to the present invention, a multifunctional valve device for HVAC pipelines is provided with a flange integrally provided at the outer end of the operating port; and is fixedly connected to an external valve core control mechanism through a plurality of screw holes on the flange.

[0032] According to the present invention, a multifunctional valve device for HVAC pipelines is provided, wherein the ball valve has a through hole on the side corresponding to the temperature measuring hole; the temperature measuring hole is connected to the through hole so that the temperature probe inside the temperature measuring hole can contact the medium flowing through the ball valve.

[0033] The technical advantages of this multifunctional valve device for HVAC ducts include: First, it improves the accuracy and real-time performance of temperature measurement. Since the temperature probe directly contacts the fluid medium inside the valve body through the sensing orifice, it avoids the signal delay and measurement errors caused by traditional surface-mounted probes that require heat conduction through the pipe wall. This allows for immediate and accurate reflection of the true temperature of the medium, providing a high-quality data foundation for precise decision-making in the control system. Second, this solution simplifies the installation process and optimizes the pipeline system structure. It integrates the valve and temperature measuring point into one unit, eliminating the need for additional pipe cutting and the installation of tees or other specialized fittings before and after the valve to insert the temperature probe. This reduces construction steps, material and labor costs, and also reduces connection points in the pipeline system, lowering the potential risk of leakage and making the entire system more compact and reliable. Finally, by directly acquiring temperature data at key flow control nodes, it achieves "zero-distance" control and feedback, enabling control algorithms (such as flow control strategies based on the supply and return water temperature difference) to perform calculations based on the most direct and relevant parameters. This improves the control accuracy, response speed, and energy efficiency of the entire HVAC system. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is the overall assembly drawing of this utility model;

[0036] Figure 2 This is the overall assembly drawing of this utility model;

[0037] Figure 3 This is a diagram of the internal structure of the valve body of this utility model;

[0038] Figure 4 This is a structural diagram of the valve body of this utility model (with valve core assembly assembled);

[0039] Figure 5 This is an internal sectional view of the present invention;

[0040] Figure 6 This is a structural diagram of the valve body of this utility model (with valve core assembly assembled);

[0041] Figure 7 This is a structural diagram of the valve body of this utility model (with valve core assembly assembled);

[0042] Figure 8 This is a structural diagram of the valve core assembly in this utility model;

[0043] Figure 9 This is a structural diagram of the valve core assembly in this utility model (the valve core seat near the water inlet is hidden).

[0044] Figure label:

[0045] 1. Valve body; 2. Valve core assembly; 21. Ball valve; 22. Valve core seat; 23. External thread of valve seat; 24. Internal hexagonal through hole; 25. Stepped surface; 3. Water inlet; 4. Water outlet; 5. Temperature measuring hole; 6. First connecting thread; 7. External octagonal nut; 8. Second connecting thread; 9. Receiving cavity; 10. Limiting surface; 11. Operating port; 12. Flange; 13. Through hole;

[0046] 100. External valve core control mechanism. Detailed Implementation

[0047] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model.

[0048] like Figures 1 to 7 As shown in the figure, a multifunctional valve device for HVAC ducts in this embodiment mainly includes a valve body 1 and a valve core assembly 2 installed inside the valve body 1. In practical applications, the valve body 1 is usually also connected to an external valve core control mechanism 100, such as an electric actuator, for driving the valve core assembly 2 to achieve automated control of the fluid in the pipeline.

[0049] Specifically, such as Figure 3 As shown, the valve body 1 is a one-piece structure, integrally cast or machined, with an inlet 3 and an outlet 4 on opposite sides for connecting to the supply or return water pipes of the HVAC system. Inside the valve body 1, near the inlet 3 and outlet 4, a first connecting thread 6 is integrally formed. This first connecting thread 6 is used for direct threaded connection to the interface of external HVAC pipes, forming a reliably sealed pipeline. For ease of installation and disassembly, an external octagonal nut 7 is integrally formed on the outer wall of the valve body 1 corresponding to the first connecting thread 6. When installing or removing the valve from a pipe, workers can use pipe wrenches or other tools to clamp the external octagonal nut 7 and apply rotational torque. Since the external octagonal nut 7 is an inseparable part of the valve body 1, this design solves the problem in existing technologies where applying force to different parts of the valve can cause the valve body's connections to loosen, leading to leakage accidents, significantly improving the safety and reliability during installation and maintenance.

[0050] The valve core assembly 2 is located inside the valve body 1 and is used to regulate the flow rate of the medium (such as chilled water or hot water) from the inlet 3 to the outlet 4. Figure 3 As shown, the valve body 1 has an internal receiving cavity 9 for accommodating the valve core assembly 2. Furthermore, as... Figure 4and Figure 6 As shown, the valve core assembly 2 is inserted entirely into the receiving cavity 9 from one end of the outlet 4 and fixed by a threaded connection. This internal installation structure from the port allows the exterior of the valve body 1 to remain intact, eliminating the need for additional openings or threaded connections for installing the valve core, further enhancing the structural integrity and pressure resistance of the valve body 1.

[0051] Combination Figure 4 , Figure 6 and Figure 7 As shown, the valve core assembly 2 includes a ball valve 21 as the core control element and valve core seats 22 that mate with the water inlets on opposite sides of the ball valve 21. At least one valve core seat 22 (typically the side closer to the outlet 4) has an external thread 23 formed on its outer wall. During assembly, the valve core assembly 2 is securely fixed within the receiving cavity 9 by engaging with the corresponding thread on the inner wall of the receiving cavity 9 (e.g., a portion of the first connecting thread 6 or other specially machined internal threads). To ensure accurate installation depth and axial position of the valve core assembly 2 within the receiving cavity 9, a limiting surface 10 serving as an installation reference is formed at the bottom of the inner wall of the receiving cavity 9, and a stepped surface 25 correspondingly abutting against the limiting surface 10 is provided on the valve core seat 22. When the valve core assembly 2 is screwed into place, the stepped surface 25 contacts the limiting surface 10, achieving precise positioning and ensuring the valve's sealing performance and smooth operation. To facilitate the screwing in and out of the valve core assembly 2, an internal hexagonal through hole 24 is provided on the valve core seat 22 near the outlet 4. This through hole is connected to the flow channel of the ball valve 21. During installation or maintenance, workers can use tools such as an internal hexagonal wrench to reach into the outlet 4 and engage with the internal hexagonal through hole 24 to apply torque to the valve core seat 22, thereby completing the assembly or disassembly of the valve core assembly 2. The operation is very convenient.

[0052] Furthermore, the valve body 1 integrates a temperature measurement function, solving the problems of inaccurate temperature measurement or cumbersome installation in the prior art. Specifically, as follows... Figure 5 As shown, a temperature measuring hole 5 is also provided on one side of the valve body 1, which connects to the receiving cavity 9 where the valve core assembly 2 is located. To ensure a safe and reliable installation of the temperature probe, a second connecting thread 8 is integrally formed on the inner wall of the temperature measuring hole 5. The temperature probe can be screwed into this second connecting thread 8 through its own thread to achieve a sealed fixation. A more ingenious design is that, as... Figure 6As shown, a through hole 13 is also provided on the body of the ball valve 21, directly opposite the temperature measuring hole 5. When the valve is open or partially open, the temperature measuring hole 5 is connected to the through hole 13 on the ball valve 21 via an opening on the valve core seat 22. This allows the sensing end of the temperature probe installed in the temperature measuring hole 5 to be directly immersed in the fluid medium flowing through the ball valve 21 for measurement. This design provides extremely high accuracy and a very fast response speed for temperature measurement, enabling real-time and accurate reflection of the actual water temperature in the pipes, providing a reliable data foundation for next-generation HVAC precision control algorithms. Furthermore, since the temperature measurement function is directly integrated into the valve body, there is no need to install additional fittings such as tees before and after the valve. This simplifies the piping system, saves installation space and costs, reduces potential leakage points, and eliminates the need to shut off or drain the entire piping system when installing or replacing the temperature probe, greatly simplifying construction and maintenance procedures.

[0053] To achieve external control of the valve's on / off state, such as Figure 3 and Figure 4 As shown, an operating port 11 is provided on the valve body 1 on one side (usually the top) opposite the temperature measuring hole 5. The control rod or drive shaft of the external valve core control mechanism 100 can be inserted into the operating port 11 and connected to the valve stem of the ball valve 21 inside the receiving cavity 9. Thus, the ball valve 21 is rotated by the power output from the external valve core control mechanism 100, thereby precisely regulating the medium flow rate. To ensure a stable and reliable connection between the external valve core control mechanism 100 and the valve body 1, a flange 12 is integrally provided at the outer end of the operating port 11. The flange 12 has several screw holes, and the base of the external valve core control mechanism 100 can be fixed to the flange 12 by bolts.

[0054] In addition, combined Figure 8 and Figure 9 As shown, the ball valve 21 has a circular through hole 211 extending from the inlet 3 to the outlet 4. The valve core seat 22, located near the inlet 3, has a shaped inlet hole 221 that connects to the circular through hole 211. The shaped inlet hole 221 is composed of interconnected semicircular and triangular holes, with the apex of the triangular hole located on the rotation plane of the ball valve 21. During use, as the ball valve 21 rotates from the semicircular hole to the triangular hole, the communication space between the circular through hole 211 and the shaped inlet hole 221 decreases linearly, thus controlling the linear decrease in water flow into the valve body 1. Conversely, as the ball valve 21 rotates from the triangular hole to the semicircular hole, the communication space between the circular through hole 211 and the shaped inlet hole 221 increases linearly, thus controlling the linear increase in water flow into the valve body 1.

[0055] In summary, the multifunctional valve device for HVAC ducts provided by this utility model effectively avoids the risk of water leakage during installation and disassembly through its integrated valve body structure and internally assembled valve core assembly. Furthermore, its innovative combination of a direct-insertion temperature measuring orifice with the valve core structure achieves high-precision, fast-response temperature measurement on a single valve, eliminating the need for additional pipe fittings, simplifying system installation, reducing costs, and providing an ideal solution for energy saving and precise control of HVAC systems.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multifunctional valve device for HVAC ducts, characterized in that, Includes a valve body (1) and a valve core assembly (2) disposed within the valve body (1); The valve body (1) has an inlet (3) and an outlet (4) on opposite sides respectively. The valve core assembly (2) is connected between the inlet (3) and the outlet (4) to regulate the flow rate of the medium flowing from the inlet (3) to the outlet (4) through the valve core assembly (2). The valve body (1) is provided with a temperature measuring hole (5) connected to the valve core assembly (2) on one side, and a temperature probe is provided in the temperature measuring hole (5).

2. The multifunctional valve device for HVAC pipelines according to claim 1, characterized in that, The inner wall of the valve body (1) is integrally provided with a first connecting thread (6) at a position close to the water inlet (3) and the water outlet (4). The water inlet (3) and the water outlet (4) on both sides of the valve body (1) are respectively connected to the heating pipe through the first connecting thread (6).

3. The multifunctional valve device for HVAC pipelines according to claim 2, characterized in that, The outer wall of the valve body (1) is integrally provided with an external octagonal nut (7) at a position close to the water inlet (3) and the water outlet (4), so as to turn the first connecting thread (6) inside the valve body (1) by means of the external octagonal nut (7).

4. The multifunctional valve device for HVAC pipelines according to claim 1, characterized in that, The inner wall of the valve body (1) has a second connecting thread (8) integrally formed inside the temperature measuring hole (5), and the inside of the temperature measuring hole (5) is connected to the temperature probe through the second connecting thread (8).

5. The multifunctional valve device for HVAC ducts according to claim 2, characterized in that, The valve body (1) has a receiving cavity (9) inside for accommodating the valve core assembly (2); The valve core assembly (2) is integrally inserted into the valve body (1) from the outlet (4) and threadedly connected to the receiving cavity (9).

6. The multifunctional valve device for HVAC ducts according to claim 5, characterized in that, The valve core assembly (2) includes a ball valve (21) and a valve core seat (22) that is fitted to the water inlets on opposite sides of the ball valve (21). At least one of the valve core seats (22) has a section of valve seat external thread (23) formed on its outer wall; The valve core assembly (2) is fixedly disposed in the receiving cavity (9) by the mutual engagement of the valve seat external thread (23) and the first connecting thread (6).

7. The multifunctional valve device for HVAC ducts according to claim 6, characterized in that, The valve core seat (22) has an internal hexagonal through hole (24) connected to the ball valve (21) on the side near the outlet (4). The valve core seat (22) is turned by the internal hexagonal through hole (24), and the external thread (23) of the valve seat is rotated.

8. The multifunctional valve device for HVAC ducts according to claim 6, characterized in that, The valve core seat (22) has a stepped surface (25) on the side facing the receiving cavity (9). The inner wall of the receiving cavity (9) is formed with a limiting surface (10) that abuts against and is limited by the stepped surface (25) to define the installation position of the valve core assembly (2) in the receiving cavity (9) by means of the limiting surface (10).

9. The multifunctional valve device for HVAC pipelines according to claim 6, characterized in that, The valve body (1) has an operating port (11) on one side relative to the temperature measuring hole (5) for connecting to an external valve core control mechanism. The control rod of the external valve core control mechanism is adapted to be inserted into the operation port (11) and drive the ball valve (21) inside the receiving cavity (9) to control the rotation of the ball valve (21) and regulate the medium flow rate; The ball valve (21) has a circular through hole (211) that extends from the inlet (3) to the outlet (4). A shaped water inlet hole (221) is provided on the valve core seat (22) close to the water inlet (3) and connected to the circular through hole (211). Furthermore, the irregular water inlet (221) is composed of interconnected semi-circular holes and triangular holes, and the apex of the triangular hole is located on the rotation plane of the ball valve (21); in: When the circular through hole (211) rotates from the position of the semi-circular hole to the position of the triangular hole along with the ball valve (21), the communication space between the circular through hole (211) and the irregular water inlet hole (221) decreases linearly, so as to control the water inlet flow of the valve body (1) to decrease linearly. As the ball valve (21) rotates from the position of the triangular hole to the position of the semi-circular hole, the communication space between the circular through hole (211) and the irregular water inlet hole (221) increases linearly, thereby controlling the water inlet flow of the valve body (1) to increase linearly.

10. The multifunctional valve device for HVAC ducts according to claim 9, characterized in that, The outer end of the operating port (11) is integrally provided with a flange (12); it is fixedly connected to the external valve core control mechanism through a number of screw holes on the flange (12).

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