Leak-free fluid coupler

Abstract

The invention relates to the technical field of valve body structures, and provides a leakage-free fluid coupler which comprises a first valve body. The first valve body comprises a mother valve with two through ends, a switching bridge which is arranged in the mother valve in a sliding manner and is in sealing fit with the inner side wall of the mother valve, and a fixed valve core of which the head is fit with an inner hole of the switching bridge to form a second sealing part or separated from the inner hole to form a second fluid gap; the second elastic piece is arranged between the adapter bridge and the connecting end of the mother valve, the mother valve is sleeved with the annular switch in a sliding mode, and the tail of the fixed valve element is fixedly arranged in the mother valve; one end of the adapter bridge is provided with an insertion groove for sealing insertion; the female valve is provided with at least one locking piece penetrating through the valve wall, and the annular switch is provided with a protruding ring abutting against the locking piece to conduct locking action. Compared with a button type connection mode, according to the invention, the position of the button does not need to be aligned during connection, the button does not need to be found during unlocking, connection and unlocking of the male head and the female head can be realized only by pushing the annular switch, and the use is faster and more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of valve body structures, and in particular to a leak-free fluid coupler. Background Art

[0002] A leak-free fluid coupling is a component used for fluid transmission. It is mainly used to connect different pipes, pipelines or other fluid transmission equipment to ensure uninterrupted flow of the fluid while maintaining the sealing and stability of the connection.

[0003] In the prior art, a leak-free fluid coupler usually includes a male head and a female head, which are connected or disconnected by a button-type connection structure to achieve the connection between pipelines. However, in some complex or narrow equipment spaces, it is difficult for users to directly observe or touch the button, and they may need to adjust their posture or use tools, or adjust the position of the button when connecting; button-type leak-free fluid couplers often require precise alignment when connecting, for example, the button needs to be aligned with the card slot to achieve a snap connection, which increases the complexity and time-consuming operation. Summary of the invention

[0004] The purpose of the present invention is to provide a leakage-free fluid coupling, aiming to improve the problem that the existing leakage-free fluid coupling is inconvenient to use.

[0005] To achieve the above object, the present invention adopts the following technical solution: a leak-free fluid coupler, comprising a first valve body; The first valve body comprises a mother valve with two ends connected, a transfer bridge slidably arranged in the mother valve and sealingly fitted with the inner wall of the mother valve, a fixed valve core whose head is fitted with the inner hole of the transfer bridge to form a second sealing part or separated to form a second fluid gap, a second elastic member arranged between the transfer bridge and the connecting end of the mother valve, and an annular switch slidably sleeved outside the mother valve, and the tail of the fixed valve core is fixedly arranged in the mother valve; One end of the transfer bridge is provided with a plug-in slot for sealed plug-in; The mother valve is provided with at least one locking piece penetrating through the valve wall, and the annular switch is provided with a convex ring which presses against the locking piece to perform a locking action.

[0006] Preferably, it also includes a second valve body; the second valve body includes a male valve with two ends connected, a movable valve core that fits with the plug-in end of the male valve to form a first sealing portion or is separated from the plug-in end to form a first fluid gap, and a first elastic member arranged between the movable valve core and the connecting end of the male valve, and a locking groove that engages and locks with the locking member is provided on the outer wall of the male valve.

[0007] Preferably, a sliding groove for the annular switch to slide is provided on the outer surface of the mother valve, and a third elastic member is provided between the convex ring and the side wall of the sliding groove away from the plug-in end of the mother valve; a sliding inclined surface is provided on the side of the convex ring facing the plug-in end of the mother valve.

[0008] Preferably, at least one first fluid channel is provided in the middle of the movable valve core, the first fluid channel is provided through one end of the fixed valve core, the valve head at the other end of the movable valve core is fitted with the side wall of the plug-in end of the male valve to form a first sealing portion, or the valve head at the other end of the movable valve core is separated from the plug-in end of the male valve to form a first fluid gap; At least one second fluid channel is arranged in the middle of the fixed valve core, and the second fluid channel is arranged through one end of the fixed valve core, and the valve head at the other end of the fixed valve core is fitted with the inner hole of the transfer bridge to form a second sealing portion, or the valve head at the other end of the fixed valve core is separated from the inner hole of the transfer bridge to form a second fluid gap.

[0009] Preferably, a first flow guiding surface is provided on the connecting surface between the first fluid channel and the valve head of the movable valve core.

[0010] Preferably, a second flow-guiding surface is provided on the connecting surface between the second fluid channel and the valve head of the fixed valve core.

[0011] Preferably, one end of the fixed valve core is arranged in the valve port of the connecting end of the mother valve to form a third fluid gap.

[0012] Preferably, a first sealing ring is provided on the valve head of the fixed valve core and is sealed with the inner hole of the transfer bridge; a second sealing ring is provided on the valve head of the movable valve core and is sealed with the plug-in end of the male valve; A third sealing ring is provided on the outer side surface of the transfer bridge and is sealed with the female valve; a fourth sealing ring is provided on the outer side surface of the plug-in end of the male valve and is sealed with the plug-in groove.

[0013] Preferably, the locking piece is a spherical structure, and a plurality of through holes for placing the spherical structure are arranged in a circular array on the mother valve.

[0014] Preferably, an identification ring is provided outside the second valve body and / or the first valve body.

[0015] After adopting the above technical solution, the present invention has the following advantages compared with the background technology: 1. In the present invention, the connection and fixation of the male head and the female head are achieved through a ring switch. Compared with the traditional button-type connection method, the present invention does not need to accurately align the position of the button when connecting, and does not need to find the button when unlocking. The connection and unlocking of the male head and the female head can be achieved by pushing the ring switch. It is faster and more convenient to use and has good practicality.

[0016] 2. In the present invention, the first guide surface and the second guide surface are provided to provide a guiding effect for the fluid medium, and the possibility of turbulence is reduced through a smooth transition, so that the flow velocity of the fluid medium changes smoothly, avoiding sudden speed changes and pressure changes, thereby improving the conveying efficiency of the fluid medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of the first valve body and the second valve body of the leakage-free fluid coupling of the present invention in a connected state; Figure 2 A cross-sectional view of a second valve body of the leak-free fluid coupling of the present invention; Figure 3 A cross-sectional view of a first valve body of the leakage-free fluid coupling according to the present invention; Figure 4 It is a schematic diagram of the first valve body and the second valve body of the leakage-free fluid coupling of the present invention in a connected state; Figure 5 It is a schematic diagram of the first valve body and the second valve body of the leakage-free fluid coupling according to the present invention in an unconnected state; Figure 6 It is a structural schematic diagram of a fixed valve core of the leakage-free fluid coupling according to the present invention; Figure 7 It is a schematic structural diagram of the movable valve core of the leakage-free fluid coupling described in the present invention.

[0018] Description of reference numerals: 1. The first valve body; 10. mother valve; 101. through hole; 102. sliding groove; 1021. third elastic member; 103. locking member; 11. Transfer bridge; 111. Third sealing ring; 112. Plug-in slot; 12. Fixed valve core; 121, second fluid gap; 122, second sealing portion; 123, second fluid channel; 1231, second flow guide surface; 124, third fluid gap; 125, first sealing ring; 13. second elastic member; 14. annular switch; 141. convex ring; 1411. sliding slope; 2. Second valve body; 20. Male valve; 201. Locking groove; 202. Fourth sealing ring; 21. Movable valve core; 211, first sealing portion; 212, first fluid gap; 213, first fluid channel; 2131, first flow guide surface; 214, second sealing ring; 22, first elastic member. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] In addition, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0022] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances. Example

[0023] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the present embodiment provides a leak-free fluid coupler, including a first valve body 1; the first valve body 1 includes a mother valve 10 with two ends connected, a transfer bridge 11 slidably arranged in the mother valve 10 and sealingly fitted with the inner wall of the mother valve 10, a fixed valve core 12 whose head is fitted with the inner hole of the transfer bridge 11 to form a second sealing portion 122 or separated to form a second fluid gap 121, a second elastic member 13 arranged between the connecting end of the transfer bridge 11 and the mother valve 10, and an annular switch 14 slidably sleeved on the outside of the mother valve 10, and the tail of the fixed valve core 12 is fixedly arranged in the mother valve 10; a plug-in groove 112 for sealing plug-in is arranged at one end of the transfer bridge 11; at least one locking piece 103 penetrating the valve wall is arranged on the mother valve 10, and a convex ring 141 is arranged on the annular switch 14 to press against the locking piece 103 for locking action.

[0024] Furthermore, it also includes a second valve body 2; the second valve body 2 includes a male valve 20 with two ends connected, a movable valve core 21 that is fitted with the plug-in end of the male valve 20 to form a first sealing portion 211 or separated to form a first fluid gap 212, and a first elastic member 22 arranged between the movable valve core 21 and the connecting end of the male valve 20, and a locking groove 201 that is engaged and locked with the locking member 103 is provided on the outer wall of the male valve 20.

[0025] For ease of understanding, the first valve body 1 and the second valve body 2 are described in combination. The first valve body 1 and the second valve body 2 are a kind of quick valve, which can achieve connection or disconnection between pipelines through quick plugging or pulling operations. At the same time, threaded structures for connecting pipelines are provided at both ends of the male valve 20 and the female valve 10, or multiple annular protrusions are provided. The cross-section of the annular protrusion is a triangular structure, which is convenient for connection and sealing with the pipeline. The first elastic member 22 and the second elastic member 13 mentioned above can be equidistant springs or variable-pitch springs, preferably equidistant springs of round wire.

[0026] Specifically, when connecting the second valve body 2 and the first valve body 1, first, insert the plug-in end of the male valve 20 into the plug-in end of the female valve 10, so that the plug-in end of the male valve 20 is plugged and sealed with the plug-in groove 112 of the transfer bridge 11, and the end face of the movable valve core 21 is fit with the end face of the fixed valve core 12, thereby realizing the docking of the second valve body 2 with the first valve body 1. Then, the male valve 20 is pushed toward the direction of the female valve 10. Since the position of the fixed valve core 12 is fixed, the fixed valve core 12 presses against the movable valve core 21 to limit the movement of the movable valve core 21. The male valve 20 moves relative to the movable valve core 21 and pushes the transfer bridge 11 to slide (the first elastic member 22 and the second elastic member 13 are compressed at this time), so that the movable valve core 21 is separated from the plug-in end of the male valve 20 to form a first fluid gap 212, and the fixed valve core 12 is separated from the inner hole of the transfer bridge 11 to form a second fluid gap 121. The inner cavities at both ends of the male valve 20, the first fluid gap 212, the second fluid gap 121 and the inner cavities at both ends of the female valve 10 are connected to form a channel for the fluid medium to pass through.

[0027] In order to ensure the stability of the connection between the second valve body 2 and the first valve body 1, the male valve 20 is pushed toward the direction of the female valve 10 until the locking groove 201 of the male valve 20 is aligned with the locking piece 103 on the female valve 10. Since the locking piece 103 penetrates the valve wall of the female valve 10, the locking piece 103 has a movable space and can automatically fall into the locking groove 201 when aligned with the locking groove 201, thereby limiting the male valve 20 from being pushed further, and then pushing the annular switch 14 so that the convex ring 141 presses against the locking piece 103, so that the locking piece 103 engages with the locking groove 201, so as to realize the locking connection between the second valve body 2 and the first valve body 1.

[0028] When unlocking the second valve body 2 and the first valve body 1, it is only necessary to push the annular switch 14 to make it slide, and then pull the second valve body 2 in the direction away from the first valve body 1. Under the action of external force, the male valve 20 can lift the locking piece 103 to disengage it from the locking groove 201, thereby unlocking the connection between the second valve body 2 and the first valve body 1. The operation is simple.

[0029] Thus, compared with the traditional button-type connection method, the design of the ring switch 14 of the present invention allows the leak-free fluid coupler to be quickly plugged in and connected without identifying the direction, and the ring switch 14 can be quickly pushed to separate. It avoids the difficulty of identifying the direction for docking connection due to environmental reasons, and is more flexible and convenient in use. Similarly, there is no need to find a button when unlocking, and only the ring switch 14 needs to be pushed to unlock the male and female heads, which is faster and more convenient to use and has good practicality.

[0030] Furthermore, for the first valve body 1, it only needs to select the second valve body 2 structure of the same model to use it. The diameter of the second valve body 2 and the pipeline connection end can use different models, and the connection structure of the connection end can also be different, and can be connected by a threaded structure, or by multiple annular protrusions. It has good practicality in use.

[0031] like Figure 1 and Figure 3 As shown, in this embodiment, a sliding groove 102 for the annular switch 14 to slide is provided on the outer surface of the mother valve 10, and a third elastic member 1021 is provided between the convex ring 141 and the side wall of the sliding groove 102 away from the plug-in end of the mother valve 10. The third elastic member 1021 can be a spring.

[0032] Specifically, when the locking member 103 does not fall into the locking groove 201, the locking member 103 abuts against the convex ring 141 of the annular switch 14 at the side, and the third elastic member 1021 is in a compressed state; when the locking member 103 falls into the locking groove 201, the force abutting against the convex ring 141 disappears, and the third elastic member 1021 pushes the convex ring 141 to move to abut against the locking member 103 on the top surface, achieving the effect of automatic locking. When unlocking, the locking member 103 abuts against one side of the convex ring 141, limiting the annular switch 14 from detaching from one end of the first valve body 1, and the third elastic member 1021 abuts against the other side of the convex ring 141, limiting the annular switch 14 from detaching from the other end of the first valve body 1, so as to ensure the stability of the structure.

[0033] like Figure 3 As shown, in this embodiment, a sliding slope 1411 (i.e., a side of the convex ring 141 that slides with the locking piece 103) is provided on one side of the convex ring 141 that faces the plug-in end of the mother valve 10. In this way, when the locking piece 103 moves, the sliding slope 1411 of the convex ring 141 contacts the locking piece 103, making the sliding smoother and achieving the effect of fast locking and unlocking. In addition, the sliding slope 1411 can better disperse the pressure, reduce the friction force in contact with the locking piece 103, avoid damage, and thus extend the service life of the leak-free fluid coupling.

[0034] like Figure 6 and Figure 7As shown, in this embodiment, at least one first fluid channel 213 is provided in the middle of the movable valve core 21, and the first fluid channel 213 is provided through one end of the fixed valve core 12, and the valve head at the other end of the movable valve core 21 fits with the side wall of the plug-in end of the male valve 20 to form a first sealing portion 211, or the valve head at the other end of the movable valve core 21 is separated from the plug-in end of the male valve 20 to form a first fluid gap 212. Specifically, in the initial state, the valve head of the movable valve core 21 fits with the side wall of the plug-in end of the male valve 20 to form the first sealing portion 211; when the male valve 20 is pushed toward the direction of the female valve 10, the valve head of the movable valve core 21 is separated from the plug-in end of the male valve 20, and at this time, the first fluid gap 212 for the fluid medium to pass through is formed between the first fluid channel 213 of the movable valve core 21 and the side wall of the plug-in end of the male valve 20.

[0035] At least one second fluid channel 123 is arranged in the middle of the fixed valve core 12. The second fluid channel 123 passes through one end of the fixed valve core 12. The valve head at the other end of the fixed valve core 12 fits with the inner hole of the transfer bridge 11 to form a second sealing portion 122. Alternatively, the valve head at the other end of the fixed valve core 12 is separated from the inner hole of the transfer bridge 11, so that a second fluid gap 121 is formed between the second fluid channel 123 of the fixed valve core 12 and the inner hole of the transfer bridge 11.

[0036] There may be a plurality of first fluid channels 213 and second flow channels, thereby expanding the fluid gap and accelerating the speed at which the fluid medium passes.

[0037] like Figure 6 and Figure 7 As shown, in this embodiment, a first guide surface 2131 is provided on the connection surface between the first fluid channel 213 and the valve head of the movable valve core 21. A second guide surface 1231 is provided on the connection surface between the second fluid channel 123 and the valve head of the fixed valve core 12. Specifically, the first guide surface 2131 and the second guide surface 1231 can be inclined surfaces or curved surfaces, which provide a guiding effect for the fluid medium. Since the fluid medium is prone to turbulence due to changes in flow velocity at the connection surface position, the use of inclined surface or curved surface structure can reduce the possibility of turbulence through a gentle transition, so that the flow velocity of the fluid medium changes smoothly, avoid sudden changes in velocity and pressure, and thus improve the delivery efficiency of the fluid medium.

[0038] like Figure 1 and Figure 3As shown, in this embodiment, one end of the fixed valve core 12 is arranged in the valve port of the connecting end of the mother valve 10 and forms a third fluid gap 124. Specifically, one end of the fixed valve core 12 is connected to the valve port of the connecting end of the mother valve 10 to fix the position of the fixed valve core 12, and the third fluid gap 124 is formed between one end of the fixed valve core 12 and the valve port of the connecting end of the mother valve 10. For example, one end of the fixed valve core 12 can be retracted toward the axis, so that the cross-sectional area of ​​one end of the fixed valve core 12 is smaller than the cross-sectional area of ​​the valve port, so that the third fluid gap 124 for the fluid medium to pass through can be formed.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, in this embodiment, a first sealing ring 125 is provided on the valve head of the fixed valve core 12 to seal with the inner hole of the transfer bridge 11; a second sealing ring 214 is provided on the valve head of the movable valve core 21 to seal with the plug-in end of the male valve 20; a third sealing ring 111 is provided on the outer side of the transfer bridge 11 to seal with the female valve 10; and a fourth sealing ring 202 is provided on the outer side of the plug-in end of the male valve 20 to seal with the plug-in groove 112. The first sealing ring 125, the second sealing ring 214, the third sealing ring 111 and the fourth sealing ring 202 can be O-type sealing rings, which can be made of silicone rubber or ethylene propylene rubber or hydrogenated nitrile rubber, so that a sealed structure is formed between the movable valve core 21 and the male valve 20, between the male valve 20 and the transfer bridge 11, between the fixed valve core 12 and the transfer bridge 11, and between the transfer bridge 11 and the female valve 10, so as to avoid leakage of the fluid medium and improve the sealing performance of the structure.

[0040] like Figure 1 and Figure 3 As shown, in this embodiment, the locking element 103 is a spherical structure, and a plurality of through holes 101 for placing the spherical structures are arranged in a circumferential array on the mother valve 10. The spherical structure cooperates with the sliding inclined surface 1411 of the convex ring 141 to make the sliding smoother and reduce the friction, thereby extending the service life of the non-leakage fluid coupling. Multiple spherical structures can be arranged to increase the stability of the locking connection between the second valve body 2 and the first valve body 1.

[0041] In this embodiment, an identification ring is provided outside the second valve body 2 and / or the first valve body 1. The identification ring can be used in different colors to identify the temperature of the fluid medium. For example, a red identification ring can be used to identify a hot medium, and a blue identification ring can be used to identify a cold medium. Alternatively, it can be used to identify different types of fluid media, for example, different colors can be used to identify different fluid media such as coolants and lubricating oils, so as to facilitate quick identification and avoid incorrect connection.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. Leak-free fluid coupling, characterized in that: It comprises a first valve body (1); The first valve body (1) comprises a mother valve (10) with two ends connected, a transfer bridge (11) slidably arranged in the mother valve (10) and sealingly fitted with the inner wall of the mother valve (10), a fixed valve core (12) whose head is fitted with the inner hole of the transfer bridge (11) to form a second sealing portion (122) or separated to form a second fluid gap (121), a second elastic member (13) arranged between the connecting end of the transfer bridge (11) and the mother valve (10), and an annular switch (14) slidably sleeved outside the mother valve (10), and the tail of the fixed valve core (12) is fixedly arranged in the mother valve (10); One end of the transfer bridge (11) is provided with an insertion groove (112) for sealed insertion; The mother valve (10) is provided with at least one locking piece (103) penetrating through the valve wall, and the annular switch (14) is provided with a convex ring (141) that presses against the locking piece (103) to perform a locking action; It also includes a second valve body (2); The second valve body (2) comprises a male valve (20) with two through-going ends, a movable valve core (21) which fits with the plug-in end of the male valve (20) to form a first sealing portion (211) or separates from the plug-in end to form a first fluid gap (212), and a first elastic member (22) arranged between the movable valve core (21) and the connecting end of the male valve (20), and a locking groove (201) which is engaged and locked with the locking member (103) is arranged on the outer wall of the male valve (20).

2. The leak-free fluid coupling according to claim 1, characterized in that: A sliding groove (102) for the annular switch (14) to slide is provided on the outer surface of the mother valve (10), and a third elastic member (1021) is provided between the convex ring (141) and the side wall of the sliding groove (102) away from the plug-in end of the mother valve (10).

3. The leak-free fluid coupling according to claim 1, characterized in that: At least one first fluid channel (213) is provided in the middle of the movable valve core (21), and the first fluid channel (213) is provided through one end of the fixed valve core (12), and the valve head at the other end of the movable valve core (21) is fitted with the side wall of the plug-in end of the male valve (20) to form a first sealing portion (211), or the valve head at the other end of the movable valve core (21) is separated from the plug-in end of the male valve (20) to form a first fluid gap (212); At least one second fluid channel (123) is provided in the middle of the fixed valve core (12), and the second fluid channel (123) is provided through one end of the fixed valve core (12), and the valve head at the other end of the fixed valve core (12) is fitted with the inner hole of the transfer bridge (11) to form a second sealing portion (122), or the valve head at the other end of the fixed valve core (12) is separated from the inner hole of the transfer bridge (11) to form a second fluid gap (121).

4. The leak-free fluid coupling according to claim 3, characterized in that: A first flow-guiding surface (2131) is provided on the connecting surface between the first fluid channel (213) and the valve head of the movable valve core (21).

5. The leak-free fluid coupling according to claim 4, characterized in that: A second flow-guiding surface (1231) is provided on the connection surface between the second fluid channel (123) and the valve head of the fixed valve core (12).

6. The leak-free fluid coupling according to claim 3 or 5, characterized in that: One end of the fixed valve core (12) is arranged in the valve port of the connecting end of the mother valve (10) and forms a third fluid gap (124).

7. The leak-free fluid coupling according to claim 3, characterized in that: A first sealing ring (125) is provided on the valve head of the fixed valve core (12) and is sealed with the inner hole of the transfer bridge (11); a second sealing ring (214) is provided on the valve head of the movable valve core (21) and is sealed with the plug-in end of the male valve (20); A third sealing ring (111) is provided on the outer side of the transfer bridge (11) and is sealed with the female valve (10); and a fourth sealing ring (202) is provided on the outer side of the plug-in end of the male valve (20) and is sealed with the plug-in groove (112).

8. The leak-free fluid coupling according to claim 1, characterized in that: The locking element (103) is a spherical structure, and a plurality of through holes (101) for accommodating the spherical structure are arranged in a circumferential array on the mother valve (10).

9. The leak-free fluid coupling according to claim 1 or 3, characterized in that: A sliding inclined surface (1411) is provided on one side of the convex ring (141) facing the plug-in end of the female valve (10).

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