Blind plate valve

Abstract

The blind plate valve comprises a first valve body, a second valve body, a blind plate and a press fit structure, the blind plate is arranged between the first valve body and the second valve body, the blind plate comprises a communication part and a partition part, and the blind plate is provided with an area for moving the communication part or the partition part to a position between a first circulation channel and a second circulation channel. The communication state or the separation state of the first circulation channel and the second circulation channel is communicated or separated; the side, close to the blind plate, of the second valve body is sleeved with the pressing structure, and the pressing structure moves in the direction close to or away from the blind plate so that the blind plate can abut against the first valve body or loosen the blind plate. The press fit structure is connected with the second valve body through multiple threads. By means of the structure, the working efficiency of the whole blind plate valve can be improved, the function of a single-head thread can be effectively achieved only through the short multi-head thread length, the overall appearance size of the rapid switching blind plate valve is effectively reduced, and the rapid switching blind plate valve can be installed in a narrow space.

Description

Technical Field

[0001] The utility model relates to the technical field of blind plate valves, in particular to a blind plate valve. Background Art

[0002] A blind valve is a gate valve that is manually, electrically, pneumatically or hydraulically operated to cut off gas media. It is generally divided into electric blind valves, hydraulic blind valves, pneumatic blind valves, closed blind valves and electric open blind valves. Electric blind valves generally include a valve body, a drive device and a clamping device.

[0003] In the use of blind plate valves, single-start thread transmission is usually used; therefore, a large rotation angle is required to achieve the clamping and loosening functions of the blind plate, which is inefficient and will make the overall volume of the blind plate valve larger. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is that in the use of the blind plate valve, a single-start thread drive is usually used; therefore, a large rotation angle is required to achieve the clamping and loosening functions of the blind plate, which is inefficient and will make the overall volume of the blind plate valve larger.

[0005] To this end, the utility model provides a blind plate valve, comprising:

[0006] a first valve body, wherein a first flow passage is formed in the first valve body;

[0007] a second valve body, the second valve body being spaced apart and arranged on one side of the first valve body, and a second flow channel being opened in the second valve body;

[0008] A blind plate, the blind plate is arranged between the first valve body and the second valve body, the blind plate comprises a connecting portion and a blocking portion, and the blind plate has a function of moving the connecting portion or the blocking portion to a region between the first circulation channel and the second circulation channel to connect or block the connecting state or blocking state of the first circulation channel and the second circulation channel;

[0009] and a pressing structure, wherein the pressing structure is sleeved on a side of the second valve body close to the blind plate, and the pressing structure moves in a direction close to or away from the blind plate, so as to be suitable for pressing the blind plate against the first valve body or releasing the blind plate;

[0010] Wherein, the press-fit structure and the second valve body are connected by multi-threaded connection.

[0011] Optionally, the above-mentioned pressing structure includes: a valve seat ring and a valve seat arranged in sequence from a side away from the blind plate to a side close to the blind plate, the valve seat ring and the valve seat are both arranged on the second valve body, and the valve seat ring is connected to the valve seat;

[0012] The valve seat ring can drive the valve seat to move along the axial direction of the second valve body to press or release the blind plate.

[0013] Optionally, the second valve body is provided with a first annular mounting groove and a second annular mounting groove corresponding to the valve seat ring and the valve seat respectively; the valve seat ring is sleeved on the first annular mounting groove, and the valve seat is sleeved on the second annular mounting groove;

[0014] The inner wall of the valve seat ring is threadedly connected to the first annular mounting groove, and the valve seat ring is rotatable to drive the valve seat to move along the axial direction of the second valve body to press or loosen the blind plate.

[0015] Optionally, the valve seat ring and the first annular mounting groove are connected by a multi-threaded connection.

[0016] Optionally, the above-mentioned pressing structure further includes: a connecting piece, wherein the connecting piece is arranged on the valve seat ring and the connecting piece is also connected to the valve seat, and the valve seat ring drives the valve seat to move through the connecting piece.

[0017] Optionally, the axial cross-section of the above-mentioned connecting piece is U-shaped; the inner wall of the connecting piece is arranged to fit the valve seat ring; a first connecting groove is opened on the outer side of the valve seat ring, and a second connecting groove is opened on the outer side of the valve seat; one end of the connecting piece is installed in the first connecting groove, and the other end is installed in the second connecting groove.

[0018] Optionally, the above-mentioned blind plate valve further includes:

[0019] At least two first elastic seals, wherein the at least two first elastic seals are respectively arranged on both sides of the connecting portion;

[0020] At least two second elastic seals are provided, and at least two second elastic seals are respectively arranged on both sides of the partition portion.

[0021] Optionally, the first elastic seal and the second elastic seal are configured as O-type.

[0022] Optionally, when the blind plate is in a connected state, the first elastic sealing member is arranged corresponding to the valve seat;

[0023] When the blind plate is in the blocking state, the second elastic sealing member is arranged corresponding to the valve seat.

[0024] Optionally, the two ends of the blind plate are set as a first end and a second end along the moving direction of the blind plate;

[0025] The blind plate valve further comprises a first limiter and a second limiter, wherein the first limiter is arranged at the first end and the second limiter is arranged at the second end;

[0026] When the blind plate is in a blocking state, the first limiter abuts against the outer wall surface of the first valve body;

[0027] When the blind plate is in a connected state, the second limiting member abuts against the outer wall surface of the first valve body.

[0028] The technical solution provided by the utility model has the following advantages:

[0029] 1. This embodiment provides a blind plate valve, which includes: a first valve body, a second valve body, a blind plate and a press-fit structure, wherein the first valve body is arranged on the left side of the entire device, the second valve body is arranged on the right side of the entire device, the blind plate is arranged between the first valve body and the second valve body, a first flow channel is opened inside the first valve body, a second flow channel is opened inside the second valve body, the first flow channel and the second flow channel have the same aperture, and the two are arranged coaxially; the blind plate is plate-shaped, and its front-to-back width is greater than or equal to the outer diameter of the outer surface of the blind plate valve, a through hole is arranged at the lower position of the blind plate, the aperture of the through hole is the same as the aperture of the first flow channel and the second flow channel, and the through hole is the connecting part, and the upper part of the blind plate is closed, that is, the partition part, and the diameter of the partition part is the same as that of the connecting part. The press-fit structure can be arranged on both the first valve body and the second valve body. In this embodiment, it is preferably arranged on the side of the left end of the second valve body on the right side close to the blind plate, and the press-fit structure and the second valve body are connected by multi-threaded connection.

[0030] The operation of the blind plate valve is explained by taking the switching of the blind plate from the isolation state to the connecting state as an example. First, the pressing structure is rotated, and the rotary motion is converted into linear motion through the multi-start threads between the pressing structure and the second valve body. The pressing structure moves to the right, loosens the blind plate, and puts the blind plate in a switchable state. The blind plate is moved upward until the connecting part is coaxial with the first circulation channel and the second circulation channel; then the pressing structure is rotated in the opposite direction, and the pressing structure moves to the left until the blind plate is pressed against the first valve body. At this time, the sealing function between the first valve body and the blind plate, and between the second valve body and the blind plate is achieved by utilizing the pressing force of the pressing structure and the self-locking effect of the threads. Compared with the single-start thread in the prior art, the present application utilizes a multi-start thread. A single-start thread has only one spiral groove, and the lead is equal to the pitch, while a multi-start thread has two or more spiral grooves, and the lead is equal to the pitch multiplied by the number of starts. Under the same pitch, the lead of the multi-start thread is larger than that of the single-start thread, and the distance moved by the multi-start thread in one rotation is several times the distance moved by the single-start thread in one rotation (the multiple is the number of thread starts); therefore, when a multi-start thread is used to connect the pressing structure and the second valve body, the pressing structure only needs to rotate a very small angle to move a large distance on the second valve body, thereby improving the working efficiency of the entire blind plate valve, and this design effectively only requires a shorter multi-start thread length to complete the function of the single-start thread, effectively reducing the overall external dimensions of the quick-switching blind plate valve, and can be installed in a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a schematic diagram of the overall structure of the blind plate valve provided in this embodiment;

[0033] Figure 2 This is a schematic structural diagram of the second valve body provided in this embodiment;

[0034] Figure 3 It is a structural schematic diagram of the pressing structure provided in this embodiment;

[0035] Description of reference numerals:

[0036] 1-first valve body; 11-first flow channel;

[0037] 2 - second valve body; 21 - second flow channel; 22 - first annular mounting groove; 23 - second annular mounting groove;

[0038] 3-blind plate; 31-connecting part; 32-partitioning part;

[0039] 4-pressed structure; 41-valve seat ring; 42-valve seat; 43-connector;

[0040] 51 - first elastic sealing member; 52 - second elastic sealing member;

[0041] 61 - first limiting member; 62 - second limiting member. DETAILED DESCRIPTION

[0042] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional 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 referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Example 1

[0047] like Figures 1 to 3As shown, this embodiment provides a blind plate valve, which includes: a first valve body 1, a second valve body 2, a blind plate 3 and a pressing structure 4, wherein the first valve body 1 is arranged on the left side of the entire device, the second valve body 2 is arranged on the right side of the entire device, the blind plate 3 is arranged between the first valve body 1 and the second valve body 2, a first flow channel 11 is opened inside the first valve body 1, and a second flow channel 21 is opened inside the second valve body 2, the first flow channel 11 and the second flow channel 21 have the same aperture, and the two are coaxially arranged; the blind plate 3 is plate-shaped, and its front and rear width is greater than or equal to the outer diameter of the outer surface of the blind plate valve, and a through hole is arranged at the lower position of the blind plate 3, and the aperture of the through hole is the same as the aperture of the first flow channel 11 and the second flow channel 21, and the through hole is the connecting portion 31, and the upper part of the blind plate 3 is closed, that is, the partition portion 32, and the partition portion 32 has the same diameter as the connecting portion 31. The compression structure 4 can be arranged on the first valve body 1 or the second valve body 2. In this embodiment, it is preferably arranged on the left end of the second valve body 2 on the right side close to the blind plate 3. The compression structure 4 and the second valve body 2 are connected by multi-threaded connection.

[0048] The operation of the blind plate valve is explained by taking the switching of the blind plate 3 from the isolation state to the connection state as an example. First, the pressing structure 4 is rotated, and the rotary motion is converted into linear motion through the multi-start thread between the pressing structure 4 and the second valve body 2. The pressing structure 4 moves to the right, loosens the blind plate 3, and puts the blind plate 3 in a switchable state. The blind plate 3 is moved upward until the connecting portion 31 is coaxial with the first circulation channel 11 and the second circulation channel 21; then the pressing structure 4 is rotated in the opposite direction, and the pressing structure 4 moves to the left until the blind plate 3 is pressed against the first valve body 1. At this time, the sealing function between the first valve body 1 and the blind plate 3, and between the second valve body 2 and the blind plate 3 is achieved by utilizing the pressing force of the pressing structure 4 and the self-locking effect of the thread. Compared with the single-start thread in the prior art, the present application utilizes a multi-start thread. A single-start thread has only one spiral groove, and the lead is equal to the pitch, while a multi-start thread has two or more spiral grooves, and the lead is equal to the pitch multiplied by the number of threads. Under the same pitch, the lead of the multi-start thread is larger than that of the single-start thread, and the distance moved by the multi-start thread in one rotation is several times the distance moved by the single-start thread in one rotation (the multiple is the number of thread heads); therefore, when a multi-start thread is used to connect the pressing structure 4 and the second valve body 2, the pressing structure 4 only needs to rotate a very small angle to move a large distance on the second valve body 2, thereby improving the working efficiency of the entire blind plate valve, and this design effectively only requires a shorter multi-start thread length to complete the function of the single-start thread, effectively reducing the overall external dimensions of the quick-switching blind plate valve, and can be installed in a small space.

[0049] Specifically, Figures 1 to 3As shown, from the direction away from the blind plate 3 to the direction close to the blind plate 3, the pressing structure 4 includes: a valve seat ring 41 and a valve seat 42, and a connecting piece 43 connected to the valve seat ring 41 and the valve seat 42. A first annular mounting groove 22 and a second annular mounting groove 23 are provided on the left side of the second valve body 2 close to the blind plate 3. The second annular mounting groove 23 is arranged on the left side of the first annular mounting groove 22, and the outer diameter of the second annular mounting groove 23 is smaller than the outer diameter of the first annular mounting groove 22. The first annular mounting groove 22 and the second annular mounting groove 23 form a step shape. The valve seat 42 is sleeved on the second annular mounting groove 23, and the valve seat ring 41 is sleeved on the first annular mounting groove 22. The inner wall of the valve seat ring 41 and the first annular mounting groove 22 are connected by multi-threaded connection, and the valve seat 42 and the inner wall of the second annular mounting groove 23 are connected by sliding.

[0050] The connecting member 43 may be a rod, which is directly mounted on the valve seat ring 41, and the other end of the connecting member 43 is connected to the valve seat 42, and the valve seat ring 41 drives the valve seat 42 to move along the axial direction of the first valve body 1 through the connecting member 43. The connecting member 43 may also be an annular member, and along the axial direction of the first valve body 1, the cross section of the connecting member 43 is U-shaped, and the U-shaped opening of the connecting member 43 faces inward, the outer side of the valve seat ring 41 is provided with a first connecting groove, and the outer peripheral side of the valve seat 42 is provided with a second connecting groove; the right end of the connecting member 43 is inserted into the first connecting groove, and the left end of the connecting member 43 is inserted into the second connecting groove, the inner surface of the connecting member 43 is attached to the outer wall surface of the valve seat ring 41, and the connecting member 43 is fixed to the valve seat ring 41 by screws or bolts, and when the valve seat ring 41 rotates, it will drive the connecting member 43 to rotate synchronously, and drive the valve seat 42 to move along the axial position of the first valve body 1 through the connecting member 43. A connecting piece 43 is provided to connect the valve seat ring 41 and the valve seat 42 to ensure synchronous movement between the two, thereby preventing the valve seat 42 from failing to return synchronously with the valve seat ring 41 when the valve seat ring 41 moves to the right. Furthermore, the connecting piece 43 eliminates the need for direct connection between the valve seat ring 41 and the valve seat 42, thereby facilitating subsequent maintenance and replacement and reducing maintenance costs.

[0051] In this embodiment, if Figures 1 to 3As shown, the blind plate valve includes at least two first elastic seals 51 and at least two second seals. The blind plate valve is provided with mounting grooves for mounting the first elastic seals 51 and the second elastic seals 52. The mounting grooves are O-shaped and are correspondingly arranged on the peripheral sides of the connecting portion 31 and the partition portion 32. The first elastic seals 51 and the second elastic seals 52 are arranged in O-shape. Specifically, two first elastic seals 51 are arranged, and the two first elastic seals 51 are opposite to each other and correspondingly arranged on both sides of the connecting portion 31. The inner diameter of the first elastic seal 51 is larger than the inner diameter of the connecting portion 31. The first elastic seal 51 is sleeved on the outer side of the connecting portion 31, and the first elastic seal 51 is coaxially arranged with the connecting portion 31. Similarly, two second elastic seals 52 are provided, and the two second elastic seals 52 are opposite to each other and are correspondingly arranged on both sides of the partition part 32. The inner diameter of the second elastic seal 52 is larger than the inner diameter of the partition part 32. The second elastic seal 52 is sleeved on the outside of the partition part 32, and the first elastic seal 51 is coaxially arranged with the partition part 32. When the blind plate 3 is in a connected state, the connecting part 31 is coaxially arranged with the first circulation channel 11 and the second circulation channel 21. At this time, the two first elastic seals 51 corresponding to the connecting part 31, the first elastic seal 51 on the left side is arranged corresponding to the right end wall of the first valve body 1, and the first elastic seal 51 on the right side is arranged corresponding to the valve seat 42, so that when the valve seat 42 is pressed on the blind plate 3, it can just press the first elastic seal 51 to achieve the sealing between the blind plate 3 and the first valve body 1 and the second valve body 2. When the blind plate 3 is in the blocking state, the blocking portion 32 is coaxially arranged with the first circulation channel 11 and the second circulation channel 21. At this time, the two second elastic seals 52 corresponding to the blocking portion 32 are arranged, the second elastic seal 52 on the left side is arranged corresponding to the right end wall of the second valve body 2, and the second elastic seal 52 on the right side is arranged corresponding to the valve seat 42, so that when the valve seat 42 is pressed on the blind plate 3, the second elastic seal 52 can be just pressed to achieve the sealing between the blind plate 3 and the first valve body 1 and the second valve body 2. And through the arrangement of the above-mentioned pressing structure 4, the valve seat ring 41 is used to drive the valve seat 42 to translate to press or release the first elastic seal 51 or the second elastic seal 52, so as to facilitate the switching and sealing of the blind plate 3.

[0052] In this embodiment, if Figures 1 to 3 As shown, along the moving direction of the blind plate 3, the two ends of the blind plate 3 are set as the first end and the second end; Figure 1In the embodiment, the upper end of the blind plate 3 is the first end, the lower end of the blind plate 3 is the second end, and the blind plate valve further comprises a first stopper 61 and a second stopper 62, the first stopper 61 is arranged at the first end, and the second stopper 62 is arranged at the second end; when the blind plate 3 is in the blocking state, the first stopper 61 abuts against the upper wall surface of the first valve body 1; when the blind plate 3 is in the connecting state, the second stopper 62 abuts against the lower wall surface of the first valve body 1. On the one hand, it can provide positioning for the switching of the state of the blind plate 3, and on the other hand, it can also prevent the blind plate 3 from falling off between the first valve body 1 and the second valve body 2.

[0053] The working principle of the blind plate valve provided in this embodiment is as follows:

[0054] Taking the blind plate 3 switching from the blocking state to the connected state as an example to explain the operation of the blind plate valve, firstly, the transmission mechanism is used to make the valve seat ring 41 rotate in the first annular mounting groove 22, and the rotary motion is converted into linear motion through the multi-start thread between the first annular mounting groove 22 and the valve seat ring 41, and the valve seat 42 is driven to move to the right through the connecting member 43, and the second elastic seal 52 is loosened. At this time, the blind plate 3 is in a movable state, and the blind plate 3 is lifted upward until the second limiter 62 abuts against the lower wall of the first valve body 1. At this time, the connecting portion 31 is coaxial with the first circulation channel 11 and the second circulation channel 21; the valve seat ring 41 is rotated in the opposite direction, and the valve seat 42 is driven to move to the left through the connecting member 43 until it is pressed against the first elastic seal 51, and the clamping and sealing function of the blind plate 3 is realized by using the self-locking effect of the thread, and the switching is completed. Similarly, the connected state can be switched to the blocking state.

[0055] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A blind plate valve, characterized in that: include: A first valve body (1), wherein a first flow channel (11) is provided in the first valve body (1); a second valve body (2), the second valve body (2) being arranged at a distance from one side of the first valve body (1), and a second flow channel (21) being provided in the second valve body (2); a blind plate (3), the blind plate (3) being arranged between the first valve body (1) and the second valve body (2), the blind plate (3) comprising a connecting portion (31) and a blocking portion (32), the blind plate (3) having a function of moving the connecting portion (31) or the blocking portion (32) to a region between the first circulation channel (11) and the second circulation channel (21) so as to connect or block the connecting state or blocking state of the first circulation channel (11) and the second circulation channel (21); and a pressing structure (4), wherein the pressing structure (4) is sleeved on a side of the second valve body (2) close to the blind plate (3), and the pressing structure (4) moves in a direction approaching or moving away from the blind plate (3) so as to be suitable for pressing the blind plate (3) against the first valve body (1) or releasing the blind plate (3); Wherein, the compression structure (4) and the second valve body (2) are connected by a multi-threaded connection.

2. The blind plate valve according to claim 1, characterized in that: The press-fit structure (4) comprises: a valve seat ring (41) and a valve seat (42) which are arranged in sequence from a side away from the blind plate (3) to a side close to the blind plate (3), the valve seat ring (41) and the valve seat (42) are both arranged on the second valve body (2), and the valve seat ring (41) is connected to the valve seat (42); The valve seat ring (41) can drive the valve seat (42) to move along the axial direction of the second valve body (2) to press or release the blind plate (3).

3. The blind plate valve according to claim 2, characterized in that: The second valve body (2) is provided with a first annular mounting groove (22) and a second annular mounting groove (23) corresponding to the valve seat ring (41) and the valve seat (42) respectively; the valve seat ring (41) is sleeved on the first annular mounting groove (22), and the valve seat (42) is sleeved on the second annular mounting groove (23); The inner wall of the valve seat ring (41) is threadedly connected to the first annular mounting groove (22), and the valve seat ring (41) can rotate to drive the valve seat (42) to move along the axial direction of the second valve body (2) to press or loosen the blind plate (3).

4. The blind plate valve according to claim 3, characterized in that: The valve seat ring (41) and the first annular mounting groove (22) are connected by a multi-threaded connection.

5. The blind plate valve according to claim 2, characterized in that: The pressing structure (4) further comprises a connecting member (43), wherein the connecting member (43) is arranged on the valve seat ring (41), and the connecting member (43) is also connected to the valve seat (42), and the valve seat ring (41) drives the valve seat (42) to move via the connecting member (43).

6. The blind plate valve according to claim 5, characterized in that: The axial cross-section of the connecting piece (43) is U-shaped; the inner wall of the connecting piece (43) is arranged to fit the valve seat ring (41); a first connecting groove is provided on the outer side of the valve seat ring (41), and a second connecting groove is provided on the outer side of the valve seat (42); one end of the connecting piece (43) is installed in the first connecting groove, and the other end is installed in the second connecting groove.

7. The blind plate valve according to claim 3, characterized in that: The blind plate valve also includes: At least two first elastic sealing members (51), wherein the at least two first elastic sealing members (51) are respectively arranged on both sides of the connecting portion (31); At least two second elastic seals (52), wherein the at least two second elastic seals (52) are respectively arranged on both sides of the partition portion (32).

8. The blind plate valve according to claim 7, characterized in that: The first elastic sealing member (51) and the second elastic sealing member (52) are configured to be O-shaped.

9. The blind plate valve according to claim 8, characterized in that: When the blind plate (3) is in a connected state, the first elastic sealing member (51) is arranged corresponding to the valve seat (42); When the blind plate (3) is in a blocking state, the second elastic sealing member (52) is arranged corresponding to the valve seat (42).

10. The blind plate valve according to any one of claims 1 to 9, characterized in that: Arranging two ends of the blind plate (3) as a first end and a second end along the moving direction of the blind plate (3); The blind plate valve further comprises a first limiting member (61) and a second limiting member (62), wherein the first limiting member (61) is arranged at the first end, and the second limiting member (62) is arranged at the second end; When the blind plate (3) is in a blocking state, the first limiting member (61) abuts against the outer wall surface of the first valve body (1); When the blind plate (3) is in a connected state, the second limiting member (62) abuts against the outer wall surface of the first valve body (1).

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