One-way valve

Abstract

The utility model relates to the technical field of one-way valves, in particular to a one-way valve. The one-way valve comprises a valve body, a valve seat, a diaphragm and a limiting support, the valve seat is installed in the valve body, and a valve port is formed in the valve seat. The limiting support comprises a main body part and a limiting part, one end of the main body part is connected to the valve seat, the other end of the main body part is connected with the limiting part, a circulation cavity is defined by the limiting support and the valve seat, and the membrane is movably installed in the circulation cavity to open or close the valve port. Wherein an included angle is formed between the limiting part and the main body part, and one end, far away from the main body part, of the limiting part extends towards the interior of the circulation cavity and forms a stop rib. When the diaphragm moves towards the direction close to the valve seat, the diaphragm can abut against the valve seat in a sealed mode, and the valve port is closed. When the diaphragm moves in the direction away from the valve seat, the diaphragm can abut against the stopping protruding edge and make linear contact with the stopping protruding edge. According to the one-way valve, the problem that in an existing diaphragm and limiting support matching structure, a diaphragm is difficult to restore or fails to restore is solved.

Description

Technical Field

[0001] The present application relates to the technical field of one-way valves, and in particular to a one-way valve. Background Art

[0002] Diaphragm-type one-way valves are widely used in air-conditioning systems. They usually include a valve body, a valve seat, a magnet, and a diaphragm. The valve seat is installed in the valve body, and the valve seat is provided with a valve port for the circulation of the refrigerant. The magnet is in the shape of a long strip and installed in the valve seat, and the magnet can attract the diaphragm so that the diaphragm cover is arranged on the valve port. When the refrigerant flows in the forward direction, the refrigerant can overcome the magnetic force to break open the diaphragm and open the valve port. When the refrigerant flows in the reverse direction, the diaphragm will block the valve port under the magnetic force and the refrigerant pressure, thereby cutting off the valve port. That is, the diaphragm-type one-way valve realizes the one-way circulation of the refrigerant by means of the cooperation between the magnet and the diaphragm.

[0003] In the related art, a limiting bracket is usually connected to the valve seat, and the movement of the diaphragm is limited by the limiting surface on the limiting bracket to prevent the diaphragm from moving excessively. However, when the valve port is fully open, the diaphragm will be in close contact with the limiting surface, and the refrigerant and the like will penetrate into the contact surface between the two to form tension, which will cause the diaphragm to require a larger magnetic force to reset. If the magnetic force is not enough, the diaphragm cannot be reset, which will cause the one-way valve to fail to close. In other words, the one-way valve requires a larger magnet to meet the magnetic force requirements, but the increase in the size of the magnet will affect the flow capacity of the one-way valve on the one hand, and increase the manufacturing cost on the other. Utility Model Content

[0004] Based on this, it is necessary to provide a one-way valve to solve the problem that the diaphragm is difficult to restore or fails to restore in the existing diaphragm and limit bracket matching structure.

[0005] The present application provides a one-way valve, which comprises a valve body, a valve seat, a diaphragm and a limiting bracket, wherein the valve seat is installed in the valve body, and the valve seat is provided with a valve port that passes through the valve seat; the limiting bracket comprises a main body and a limiting portion, one end of the main body is connected to the valve seat, and the other end is used to connect the limiting portion, and the limiting bracket and the valve seat form a flow cavity, and the diaphragm is movably installed in the flow cavity to open or close the valve port; wherein the limiting portion is arranged at an angle with the main body, and one end of the limiting portion away from the main body extends toward the inside of the flow cavity and is formed with a stop ridge; when the diaphragm moves toward the valve seat, the diaphragm can be sealed and abutted against the valve seat, and the valve port is closed; when the diaphragm moves toward the direction away from the valve seat, the diaphragm can abut against the stop ridge and form a linear contact with the stop ridge, and the valve port is opened.

[0006] In one embodiment, the main body includes a columnar segment and an arc segment, one end of the arc segment is connected to the columnar segment, and the other end is connected to the limiting portion; wherein the limiting portion is provided with a through hole connected to the flow cavity.

[0007] In one embodiment, the limiting portion, the columnar segment and the arc segment are an integrally bent structure.

[0008] In one embodiment, along the axial direction of the limiting bracket, the vertical distance H1 from the stop ridge to the connection between the limiting portion and the arc segment, and the vertical distance h1 from the connection between the limiting portion and the arc segment to the connection between the arc segment and the columnar segment satisfy, H1>h1.

[0009] In one embodiment, the main body includes a columnar segment, an arc segment and a blocking segment, the blocking segment blocks one end of the flow cavity, and the surrounding side of the blocking segment is connected to the arc segment and connected to the columnar segment through the arc segment; wherein the limiting portion protrudes and is connected to the end face of the blocking segment close to the flow cavity.

[0010] In one embodiment, along the axial direction of the limiting bracket, the vertical distance H2 from the stop ridge to the connection between the limiting portion and the blocking section, and the vertical distance h2 from the connection between the blocking section and the arc section to the connection between the arc section and the columnar section, satisfy, H2>h2.

[0011] In one embodiment, the one-way valve further includes a magnet, which is limitedly installed in the valve port, and the magnet and the diaphragm are magnetically matched to drive the diaphragm to move toward the valve seat so that the diaphragm is sealed in the valve port.

[0012] In one embodiment, the one-way valve further includes a filter screen, which is disposed at an end of the valve seat away from the diaphragm and connected to the valve seat.

[0013] In one of the embodiments, the one-way valve further comprises a fixing ring, which is sleeved on one end of the valve seat and connected to the valve seat; wherein one end of the filter screen is clamped between the fixing ring and the valve seat.

[0014] In one embodiment, the valve body includes a first valve tube and a second valve tube, and the outer wall of the valve seat protrudes to form a connecting boss, one end of the connecting boss is attached to and connected to the end of the first valve tube, and the other end is attached to and connected to the end of the second valve tube; or, the valve body is an integrated structure.

[0015] Compared with the prior art, the one-way valve provided in the present application can effectively reduce the contact area between the diaphragm and the limit bracket by setting a stop ridge on the limit part and using the stop ridge to achieve linear contact with the diaphragm, thereby reducing the tension formed by the refrigerant between the limit bracket and the diaphragm. In this way, the resistance that the diaphragm needs to overcome when returning is smaller, which greatly reduces the difficulty of returning the diaphragm. On the other hand, since the return resistance is reduced, there is no need to increase the magnetic force by increasing the volume of the magnet, which can not only reduce the manufacturing cost, but also reduce the impact of the increase in volume on the circulation of the refrigerant. At the same time, the magnetic force that needs to be overcome when opening the valve is weakened, and the one-way valve is easier to open. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A cross-sectional view of a one-way valve according to an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of a valve seat assembly according to an embodiment of the present application;

[0019] Figure 3 A schematic structural diagram of a position limiting bracket according to an embodiment of the present application.

[0020] The symbols in the figure mean the following:

[0021] 100, one-way valve; 10, valve body; 11, first valve tube; 12, second valve tube; 20, valve seat assembly; 21, valve seat; 2101, valve port; 211, connecting boss; 22, magnet; 23, diaphragm; 24, limit bracket; 2401, flow chamber; 2402, flow port; 2403, through hole; 241, main body; 2411, columnar section; 2412, arc section; 242, limit part; 2421, stop ridge; 25, filter screen; 26, fixing ring. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0027] Diaphragm-type one-way valves are widely used in air-conditioning systems. They usually include a valve body, a valve seat, a magnet, and a diaphragm. The valve seat is installed in the valve body, and the valve seat is provided with a valve port for the circulation of the refrigerant. The magnet is in the shape of a long strip and installed in the valve seat, and the magnet can attract the diaphragm so that the diaphragm cover is arranged on the valve port. When the refrigerant flows in the forward direction, the refrigerant can overcome the magnetic force to break open the diaphragm and open the valve port. When the refrigerant flows in the reverse direction, the diaphragm will block the valve port under the magnetic force and the refrigerant pressure, thereby cutting off the valve port. That is, the diaphragm-type one-way valve realizes the one-way circulation of the refrigerant by means of the cooperation between the magnet and the diaphragm.

[0028] In the related art, a limiting bracket is usually connected to the valve seat, and the movement of the diaphragm is limited by the limiting surface on the limiting bracket to prevent the diaphragm from moving excessively. However, when the valve port is fully open, the diaphragm will be in close contact with the limiting surface, and the refrigerant and the like will penetrate into the contact surface between the two to form tension, which will cause the diaphragm to require a larger magnetic force to reset. If the magnetic force is not enough, the diaphragm cannot be reset, which will cause the one-way valve to fail to close. In other words, the one-way valve requires a larger magnet to meet the magnetic force requirements, but the increase in the size of the magnet will affect the flow capacity of the one-way valve on the one hand, and increase the manufacturing cost on the other.

[0029] See also Figure 1-Figure 3 In order to solve the problem that the diaphragm is difficult to restore or fails to restore in the existing diaphragm and limit bracket matching structure, the present application provides a one-way valve 100. The one-way valve 100 includes a valve body 10, a valve seat 21, a diaphragm 23 and a limit bracket 24. The valve seat 21 is installed in the valve body 10, and the valve seat 21 is provided with a valve port 2101 that penetrates the valve seat 21. The limit bracket 24 includes a main body 241 and a limit portion 242. One end of the main body 241 is connected to the valve seat 21, and the other end is used to connect the limit portion 242. The limit bracket 24 and the valve seat 21 surround a flow cavity 2401, and the diaphragm 23 is movably installed in the flow cavity 2401 to open or close the valve port 2101. Among them, the limit portion 242 is arranged at an angle with the main body 241, and the end of the limit portion 242 away from the main body 241 extends toward the inside of the flow cavity 2401, and a stop rib 2421 is formed. When the diaphragm 23 moves toward the valve seat 21, the diaphragm 23 can seal against the valve seat 21, and the valve port 2101 is closed. When the diaphragm 23 moves away from the valve seat 21, the diaphragm 23 can abut against the stop rib 2421 and form a linear contact with the stop rib 2421, and the valve port 2101 is opened.

[0030] By providing a stop rib 2421 on the limit portion 242 and using the stop rib 2421 to achieve linear contact with the diaphragm 23, the contact area between the diaphragm 23 and the limit bracket 24 can be effectively reduced, thereby reducing the tension formed by the refrigerant between the limit bracket 24 and the diaphragm 23. In this way, the resistance that the diaphragm 23 needs to overcome when returning is small, which greatly reduces the difficulty of returning the diaphragm 23. On the other hand, since the return resistance is reduced, it is not necessary to increase the magnetic force by increasing the volume of the magnet 22, thereby not only reducing the manufacturing cost, but also reducing the impact of the increase in volume on the circulation of the refrigerant. At the same time, the magnetic force that needs to be overcome when opening the valve is weakened, and the one-way valve 100 is easier to open.

[0031] Since the diaphragm 23 and the stop ridge 2421 are linearly matched, the axial flow of the refrigerant will be affected. To facilitate the smooth flow of the refrigerant, a flow port 2402 connected to the flow cavity 2401 may be provided on the peripheral side of the limiting bracket 24 .

[0032] In one embodiment, if Figure 2 As shown, the one-way valve 100 further includes a magnet 22, which is limitedly installed in the valve port 2101, and the magnet 22 and the diaphragm 23 are magnetically matched to drive the diaphragm 23 to move toward the valve seat 21, so that the diaphragm 23 is blocked in the valve port 2101. In this way, the valve port 2101 can be closed by the magnetic cooperation between the magnet 22 and the diaphragm 23.

[0033] In one embodiment, if Figure 2 As shown, the one-way valve 100 further includes a filter screen 25, which is disposed at one end of the valve seat 21 away from the diaphragm 23 and connected to the valve seat 21. In this way, impurities in the refrigerant can be filtered.

[0034] Furthermore, since the existing filter screen 25 is often fixed to the valve seat 21 by welding, if one of them is damaged or its performance does not meet the standard, the entire filter screen 25 will be scrapped, thereby greatly increasing the cost.

[0035] Therefore, in order to further reduce the cost of the one-way valve 100, in one embodiment, Figure 2 As shown, the one-way valve 100 further includes a fixing ring 26, which is sleeved on one end of the valve seat 21 and connected to the valve seat 21. One end of the filter 25 is sandwiched between the fixing ring 26 and the valve seat 21. In this way, not only can the filter 25 be firmly installed, but also the filter 25 can be disassembled, so that a single component can be easily replaced, which greatly reduces the production cost.

[0036] In one embodiment, if Figure 1 As shown, the valve body 10 includes a first valve tube 11 and a second valve tube 12, and the outer wall of the valve seat 21 protrudes to form a connecting boss 211, one end of the connecting boss 211 is attached to and connected to the end of the first valve tube 11, and the other end is attached to and connected to the end of the second valve tube 12. In this way, the installation of the valve seat 21 is simpler, and the overall processing and molding efficiency of the one-way valve 100 can be improved.

[0037] Specifically, the first valve tube 11, the second valve tube 12 and the valve seat 21 can be fixed by laser welding. At the same time, in order to avoid shaking between them during the welding process, the first valve tube 11, the second valve tube 12 and the valve seat 21 can be pre-fixed by interference fit, thereby improving the reliability of welding.

[0038] Furthermore, before welding the valve seat 21 and the valve body 10, the valve seat 21, the diaphragm 23, the limit bracket 24, the magnet 22, the filter screen 25 and the fixing ring 26 can be combined to form the valve seat assembly 20 and then welded, which makes assembly simpler.

[0039] In other embodiments, the valve body 10 may also be configured as an integrated structure. In this case, the valve body 10 may be connected to the valve seat 21 by necking or the like, thereby achieving fixed installation of the valve seat 21 in the valve body 10 .

[0040] Embodiment 1

[0041] In this embodiment, if Figure 2 As shown, the main body 241 includes a columnar segment 2411 and an arc segment 2412, one end of the arc segment 2412 is connected to the columnar segment 2411, and the other end is connected to the limiting portion 242. The limiting portion 242 is provided with a through hole 2403 communicating with the flow cavity 2401.

[0042] It is understandable that the columnar segment 2411 is used to cooperate with the diaphragm 23 limit guide, and the arc segment 2412 is used for smooth transition between the columnar segment 2411 and the limit portion 242, reducing stress concentration and preventing the refrigerant from forming turbulence here, thereby improving the flow performance of the refrigerant. In addition, the through hole 2403 is provided on the limit portion 242, which is conducive to reducing the difficulty of forming the limit portion 242.

[0043] Specifically, the flow port 2402 is disposed on the columnar segment 2411 .

[0044] Furthermore, in one embodiment, the limiting portion 242, the columnar segment 2411 and the arc segment 2412 are an integrally bent structure. That is, the arc segment 2412 and the limiting portion 242 can be formed by stamping and bending the end of the columnar segment 2411 away from the valve seat 21, so as to improve the forming efficiency of the limiting bracket 24 and reduce the processing steps.

[0045] In one embodiment, if Figure 2 As shown, along the axial direction of the limiting bracket 24, the vertical distance H1 from the stop ridge 2421 to the connection between the limiting portion 242 and the arc segment 2412, and the vertical distance h1 from the connection between the limiting portion 242 and the arc segment 2412 to the connection between the arc segment 2412 and the columnar segment 2411 satisfy, H1>h1.

[0046] Usually, in the structure where the conventional limit bracket 24 cooperates with the diaphragm 23 through the limit surface, since the diaphragm 23 is guided by the columnar segment 2411 when it moves, when the diaphragm 23 moves to the position where it cooperates with the limit surface, the peripheral side of the diaphragm 23 is easy to interfere with the inner wall of the arc segment 2412, and there is a risk of the diaphragm 23 getting stuck. The usual solution is to form an avoidance groove by local machining on the arc segment 2412, so that a gap is formed between the limit surface and the arc segment 2412 through the avoidance groove, thereby avoiding the diaphragm 23 from getting stuck. In this embodiment, by setting H1>h1, the diaphragm 23 will not interfere with the arc segment 2412 when it is linearly matched with the stop rib 2421, thereby effectively avoiding the diaphragm 23 from getting stuck, and there is no need to process the avoidance groove, etc., which can further reduce the processing procedures and improve the processing efficiency.

[0047] Embodiment 2

[0048] In this embodiment, the main body 241 includes a columnar segment 2411, an arc segment 2412 and a blocking segment (not shown), the blocking segment blocks one end of the flow cavity 2401, and the surrounding side of the blocking segment is connected to the arc segment 2412 and connected to the columnar segment 2411 through the arc segment 2412. Among them, the limiting portion 242 protrudes and is connected to the end surface of the blocking segment close to the flow cavity 2401.

[0049] That is, in this embodiment, the blocking section can block the axial flow of the refrigerant. In this way, when part of the refrigerant enters the chamber between the diaphragm 23 and the blocking section in the flow cavity 2401 from the gap between the diaphragm 23 and the columnar section 2411, this part of the refrigerant can produce a certain reaction force on the movement of the diaphragm 23 toward the blocking section and the limit portion 242, thereby slowing down the movement speed of the diaphragm 23 and achieving a noise reduction effect.

[0050] Specifically, the blocking section is preferably configured as a disc-shaped structure, and the limiting portion 242 can be fixedly connected to the blocking section by means of snap connection or welding.

[0051] Furthermore, in one embodiment, along the axial direction of the limiting bracket 24, the vertical distance H2 from the stop ridge 2421 to the connection between the limiting portion 242 and the blocking segment, and the vertical distance h2 from the connection between the blocking segment and the arc segment 2412 to the connection between the arc segment 2412 and the columnar segment 2411 satisfy, H2>h2.

[0052] Similar to the first embodiment, by setting H2>h2, the diaphragm 23 will not interfere with the arc segment 2412 when linearly cooperating with the stop ridge 2421, thereby effectively avoiding the diaphragm 23 from getting stuck, and there is no need to process avoidance grooves, etc., which can further reduce the processing steps and improve processing efficiency.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A one-way valve, characterized in that: The valve body (10) comprises a valve seat (21), a diaphragm (23) and a limit bracket (24); the valve seat (21) is installed in the valve body (10), and the valve seat (21) is provided with a valve port (2101) penetrating the valve seat (21); The limiting bracket (24) comprises a main body (241) and a limiting part (242); one end of the main body (241) is connected to the valve seat (21), and the other end is used to connect to the limiting part (242); the limiting bracket (24) and the valve seat (21) form a flow cavity (2401); the diaphragm (23) is movably installed in the flow cavity (2401) to open or close the valve port (2101); The limiting portion (242) is arranged at an angle with the main body (241), and one end of the limiting portion (242) away from the main body (241) extends toward the inside of the flow cavity (2401) and is formed with a stop ridge (2421); When the diaphragm (23) moves toward the direction approaching the valve seat (21), the diaphragm (23) can be in sealing contact with the valve seat (21), and the valve port (2101) is closed; When the diaphragm (23) moves in a direction away from the valve seat (21), the diaphragm (23) can abut against the stop ridge (2421) and form a linear contact with the stop ridge (2421), and the valve port (2101) is opened.

2. The one-way valve according to claim 1, characterized in that: The main body (241) comprises a columnar segment (2411) and an arc segment (2412); one end of the arc segment (2412) is connected to the columnar segment (2411), and the other end is connected to the limiting portion (242); Wherein, the limiting portion (242) is provided with a through hole (2403) connected to the flow cavity (2401).

3. The one-way valve according to claim 2, characterized in that: The limiting portion (242), the columnar segment (2411) and the arc segment (2412) are an integrally bent structure.

4. The one-way valve according to claim 2, characterized in that: Along the axial direction of the limiting bracket (24), the vertical distance H1 from the stop ridge (2421) to the connection between the limiting portion (242) and the arc segment (2412), and the vertical distance h1 from the connection between the limiting portion (242) and the arc segment (2412) to the connection between the arc segment (2412) and the columnar segment (2411) satisfy, H1>h1.

5. The one-way valve according to claim 1, characterized in that: The main body (241) comprises a columnar segment (2411), an arc segment (2412) and a blocking segment, wherein the blocking segment blocks one end of the flow cavity (2401), and the peripheral side of the blocking segment is connected to the arc segment (2412) and connected to the columnar segment (2411) through the arc segment (2412); Wherein, the limiting portion (242) protrudes and is connected to the end surface of the blocking section close to the flow cavity (2401).

6. The one-way valve according to claim 5, characterized in that: Along the axial direction of the limiting bracket (24), the vertical distance H2 from the stop ridge (2421) to the connection between the limiting portion (242) and the blocking section, and the vertical distance h2 from the connection between the blocking section and the arc section (2412) to the connection between the arc section (2412) and the columnar section (2411) satisfy, H2>h2.

7. The one-way valve according to claim 1, characterized in that: The one-way valve further comprises a magnet (22), wherein the magnet (22) is installed in a limited position in the valve port (2101), and the magnet (22) and the diaphragm (23) are magnetically matched to drive the diaphragm (23) to move toward the valve seat (21), so that the diaphragm (23) is blocked in the valve port (2101).

8. The one-way valve according to claim 1, characterized in that: The one-way valve further comprises a filter screen (25), wherein the filter screen (25) is arranged at one end of the valve seat (21) away from the diaphragm (23) and is connected to the valve seat (21).

9. The one-way valve according to claim 8, characterized in that: The one-way valve further comprises a fixing ring (26), wherein the fixing ring (26) is sleeved on one end of the valve seat (21) and connected to the valve seat (21); Wherein, one end of the filter screen (25) is sandwiched between the fixing ring (26) and the valve seat (21).

10. The one-way valve according to claim 1, characterized in that: The valve body (10) comprises a first valve tube (11) and a second valve tube (12); an outer side wall of the valve seat (21) is protruded to form a connecting boss (211); one end of the connecting boss (211) is attached to and connected to the end of the first valve tube (11), and the other end is attached to and connected to the end of the second valve tube (12); Alternatively, the valve body (10) is an integrated structure.

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