A marine lug vulcanized butterfly valve

Abstract

The present invention belongs to the technical field of valve equipment, and discloses a marine lug vulcanized butterfly valve, including a pipeline and a butterfly valve body, and also including: a second valve body, the second valve body is installed on one side of the butterfly valve body, and is sleeved in the inner cavity of the pipeline; a buffer module, the buffer module is arranged inside the second valve body; a movable module, the movable module is distributed in a circular manner at equal angles on the inner wall of the first valve body; the butterfly valve body includes a first valve body, the inner wall of the first valve body is movably connected with a butterfly plate, and the inside of the butterfly plate is fixed with a valve stem. The present invention buffers and blocks the water flow of the butterfly plate that is about to be closed, blocks the continuously flowing water flow, prevents the water flow from directly and widely impacting the butterfly plate that is about to be closed, realizes early cut-off buffering, and reduces the damage caused to the marine lug vulcanized butterfly valve by the pressure wave generated by the sudden stop of the water flow.

Description

Technical Field

[0001] The invention belongs to the technical field of valve equipment, in particular to a marine lug vulcanized butterfly valve. Background Art

[0002] Marine lug butterfly valve is a valve composed of valve body, valve plate and lug as main components, which realizes the opening and closing of the valve, and then achieves the purpose of controlling the fluid flow. Among them, the "vulcanization type" mainly refers to the vulcanization treatment of the butterfly valve seat, which is to tightly combine the rubber material with the valve body or valve seat matrix through specific means, so as to improve the sealing performance and corrosion resistance of the marine lug butterfly valve.

[0003] However, the existing marine lug vulcanized butterfly valves still have disadvantages in actual use: including but not limited to the following situations: 1. When the ship system detects an abnormal situation (such as pipeline rupture, overpressure, etc.), it will send an emergency closing signal to the control system of the butterfly valve, so that the butterfly valve will be quickly closed to cut off the fluid; 2. Marine butterfly valves may generally be equipped with a safety interlock device. When a part or system of the ship fails, the device will be automatically triggered to quickly close the butterfly valve to prevent the accident from expanding.

[0004] When the butterfly valve needs to be closed suddenly and quickly, the fluid in the pipeline is subject to sudden blockage changes, resulting in pressure fluctuations. This pressure wave will have an impact on the butterfly valve, which will cause vibrations in the gears, bearings and other components inside the valve. Over time, it will cause mechanical wear and failure, reducing the service life of the marine lug vulcanized butterfly valve, so it needs to be improved. Summary of the invention

[0005] In order to solve the problem raised in the above background technology that when the marine lug vulcanized butterfly valve needs to be closed quickly, the pressure wave caused by the fluid in the pipeline causes damage to the butterfly valve, the present invention provides a marine lug vulcanized butterfly valve, which is provided with a rectangular plate and a fixed plate and other structures to buffer and block the water flow of the butterfly plate that is about to be closed, prevent the water flow from directly impacting the butterfly plate that is about to be closed in a large area, realize early cut-off buffering, and reduce the damage to the marine lug vulcanized butterfly valve caused by the pressure wave generated by the sudden stop of the water flow; through the cooperation of the structure such as the abutment plate and the movable module setting, the continuously impacting water flow is guided and expanded, and the water flow that is not blocked by the flexible folding plate is prevented from continuously and fixed-point impacting a specific area of ​​the butterfly plate, thereby further reducing the damage to the marine lug vulcanized butterfly valve.

[0006] To achieve the above object, the present invention provides the following technical solution: a marine lug vulcanized butterfly valve, comprising a pipeline and a butterfly valve body, and further comprising:

[0007] A second valve body, which is installed on one side of the butterfly valve body and sleeved in the inner cavity of the pipeline;

[0008] A buffer module, wherein the buffer module is arranged inside the second valve body;

[0009] Active modules, the active modules are distributed in an annular manner at equal angles on the inner wall of the first valve body;

[0010] The butterfly valve body comprises a first valve body, the inner wall of the first valve body is movably connected with a butterfly plate, the interior of the butterfly plate is fixedly connected with a valve stem, the outer wall of the lower end of the valve stem is fixedly connected with a stop block, and the outer wall of the first valve body is fixedly connected with the second valve body;

[0011] The buffer module includes a cross plate fixedly connected to the inner cavity of the second valve body, the side wall of the cross plate is fixedly equipped with a ring-shaped fixed plate, one side of the fixed plate is fixedly connected to a flexible folding plate, the flexible folding plate is located on the outer side of the cross plate and is movably connected to the cross plate, the end of the flexible folding plate away from the fixed plate is fixedly connected to a rectangular plate, the rectangular plate is movably connected to the cross plate, the central end of the rectangular plate is fixedly connected to a fixed disk, the inner cavity of the fixed disk is sleeved with a moving component, and the side wall of the rectangular plate away from the flexible folding plate is installed with a butt plate;

[0012] The moving assembly comprises a screw rod, the screw rod penetrates the fixed disk and the cross plate, and the screw rod is threadedly sleeved with the fixed disk.

[0013] Preferably, a driving device is installed on the top of the first valve body, and an annular groove is opened inside the first valve body to allow the stop block to rotate around the valve stem. The stop block is movably connected to the inner wall of the annular groove. When the valve stem rotates, it will synchronously drive the stop block to rotate in the inner cavity of the annular groove. The annular groove ensures the smooth movement of the stop block.

[0014] Preferably, an inner wall of the second valve body away from the port of the first valve body is provided with an oblique angle, and a straight groove for moving the moving component is provided inside the bottom end of the inner cavity of the second valve body.

[0015] Preferably, the rectangular plates are provided in four groups, and the four groups of rectangular plates are elastically connected to the cross plate through arc springs, and the end of the fixed plate away from the rectangular plate is triangular, and the fixed plate is movably clamped on the cross plate;

[0016] When the fixed disk is rotated by external force, the four rectangular plates will pull the four flexible folding plates to unfold simultaneously. The triangular design of the outer end of the fixed plate reduces the continuous impact force of the water flow on the device.

[0017] Preferably, the movable module includes a fixed block, which is fixedly connected to the inner wall of the second valve body, one end of the fixed block is hinged with a top block, the top block is elastically connected to the fixed block through a spring, and a round rod is installed on one side of the top block close to the fixed block.

[0018] Preferably, the side of the top block away from the round rod is hemispherical and has a smooth surface, and the end of the round rod away from the top block abuts against the abutment plate;

[0019] The contact end of the abutment plate and the round rod is provided with an oblique angle.

[0020] Preferably, the moving assembly comprises a push rod, one end of which is in contact with the abutment block, and the upper end of the push rod is fixedly connected to the screw rod near the side wall of the buffer module.

[0021] Preferably, the bottom end of the push rod is slidably connected to the inside of the first valve body and the second valve body, and the push rod is elastically connected to the second valve body through a spring expansion tube.

[0022] Preferably, both sides of the push rod and the abutting end of the abutting block are provided with bevels, and the push rod has an "L" shape.

[0023] Preferably, the rectangular plate is driven by external force to unfold the flexible folding plate, so that the unfolded flexible folding plate occupies half of the area between two adjacent cross-plate brackets, and when the top block is flipped by the abutment plate, the top block is located in the other half of the area between the two adjacent cross-plate brackets.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a rectangular plate and a fixed plate and other structures to cooperate, thereby buffering and blocking the water flow of the butterfly plate that is about to be closed. The rotation of the block will resist the movement of the angled port of the push rod, and synchronously drive the screw to move inside the fixed plate and the cross plate. When the screw moves, it will drive the outer wall of the fixed plate and the four rectangular plates to rotate synchronously, so that the four flexible folding plates are unfolded between two adjacent cross plate brackets, blocking the continuously flowing water flow, preventing the water flow from directly impacting the butterfly plate that is about to be closed in a large area, realizing early cut-off buffering, and reducing the damage to the marine lug vulcanized butterfly valve caused by the pressure wave generated by the sudden stop of the water flow;

[0026] The present invention conducts guided expansion of the continuously impacting water flow through the coordination of structures such as the back plate and the movable module setting. The cross plate drives the back plate to contact the round rod during the rotation process, forcing the end of the round rod to be forced to move at the oblique angle of the back plate, so that the top block rotates with the contact end of the fixed block and the top block as the axis. The hemispherical side of the top block will contact the front of the water flow and flow outward along the hemispherical surface of the top block. The top block is driven by the back plate to expand the continuously impacting water flow, preventing the water flow that is not blocked by the flexible folding plate from continuously impacting a specific area of ​​the butterfly plate at a fixed point, thereby further reducing the damage to the marine lug vulcanized butterfly valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 It is a schematic cross-sectional view of the present invention;

[0029] Figure 3 It is a schematic diagram of the structural matching relationship between the first valve body and the butterfly plate of the present invention;

[0030] Figure 4 It is a schematic diagram of the structural matching relationship between the abutment plate and the arc spring of the present invention;

[0031] Figure 5 It is a schematic diagram of the structural matching relationship between the fixed plate and the cross plate of the present invention;

[0032] Figure 6 It is a schematic diagram of the structural matching relationship between the stop block and the push rod of the present invention;

[0033] Figure 7 It is a schematic diagram of the subdivision structure of the buffer module of the present invention;

[0034] Figure 8 It is a schematic diagram of the structural matching relationship between the abutment plate and the fixing plate of the present invention;

[0035] Fig. 9 for Figure 8 A schematic diagram of the local enlarged structure at point A in the middle;

[0036] Fig.10 It is a schematic diagram of the structural matching relationship between the cross plate and the movable module of the present invention;

[0037] Fig.11 for Fig.10 A schematic diagram of the local enlarged structure at B in the middle;

[0038] Fig.12 for Fig.10 A schematic diagram of the local enlarged structure at C in the middle;

[0039] Fig.13 This is a schematic diagram of the rotation direction of the cross plate of the present invention;

[0040] Fig.14 It is a schematic diagram of the structural matching relationship between the top block and the rectangular plate of the present invention;

[0041] Fig.15 It is a schematic diagram of the flow direction of water after the water body impacts the top block according to the present invention.

[0042] In the figure: 1. pipeline; 2. butterfly valve body; 21. first valve body; 22. valve stem; 23. driving device; 24. butterfly plate; 25. stop block; 3. second valve body; 4. buffer module; 41. cross plate; 42. flexible folding plate; 43. rectangular plate; 44. stop plate; 45. arc spring; 46. fixed plate; 47. fixed plate; 5. movable module; 51. fixed block; 52. top block; 53. round rod; 54. spring; 6. moving assembly; 61. push rod; 62. spring telescopic tube; 63. screw. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] like Figures 1 to 15 As shown, the present invention provides a marine lug vulcanized butterfly valve, comprising a pipeline 1 and a butterfly valve body 2, and further comprising:

[0045] A second valve body 3, which is installed on one side of the butterfly valve body 2 and sleeved in the inner cavity of the pipeline 1;

[0046] A buffer module 4, which is arranged inside the second valve body 3;

[0047] Active modules 5, which are distributed in an annular manner at equal angles on the inner wall of the first valve body 21;

[0048] The butterfly valve body 2 comprises a first valve body 21, the inner wall of the first valve body 21 is movably connected with a butterfly plate 24, the inner part of the butterfly plate 24 is fixedly connected with a valve stem 22, the outer wall of the lower end of the valve stem 22 is fixedly connected with a stop block 25, and the outer wall of the first valve body 21 is fixedly connected with the second valve body 3;

[0049] The buffer module 4 includes a cross plate 41 fixedly connected to the inner cavity of the second valve body 3, the side wall of the cross plate 41 is fixedly equipped with a ring-shaped fixed plate 47, one side of the fixed plate 47 is fixedly connected with a flexible folding plate 42, the flexible folding plate 42 is located on the outer side of the cross plate 41 and is movably connected to the cross plate 41, the end of the flexible folding plate 42 away from the fixed plate 47 is fixedly connected with a rectangular plate 43, the rectangular plate 43 is movably connected to the cross plate 41, the central end of the rectangular plate 43 is fixedly connected with a fixed disk 46, the inner cavity of the fixed disk 46 is sleeved with a moving component 6, and the side wall of the rectangular plate 43 away from the flexible folding plate 42 is installed with a stop plate 44;

[0050] The moving assembly 6 includes a screw rod 63 . The screw rod 63 penetrates the fixed plate 46 and the cross plate 41 . The screw rod 63 is threadedly sleeved with the fixed plate 46 .

[0051] The above scheme is adopted: the block 25 rotates to contact the angled port of the push rod 61, so that the screw 63 moves inside the fixed plate 46 and the cross plate 41. When the screw 63 moves, it will drive the outer wall of the fixed plate 46 and the four rectangular plates 43 to rotate synchronously, so that the four flexible folding plates 42 are unfolded between the two adjacent cross plate 41 brackets, blocking the continuous flow of water, preventing the water flow from directly impacting the butterfly plate 24 that is about to be closed over a large area, realizing early cut-off buffering, and reducing the damage caused to the marine lug vulcanized butterfly valve by the pressure wave generated by the sudden stop of the water flow.

[0052] like Figures 2 to 4 As shown, a driving device 23 is installed on the top of the first valve body 21, and an annular groove is provided inside the first valve body 21 for allowing the stop block 25 to rotate around the valve stem 22 as the axis, and the stop block 25 is movably connected to the inner wall of the annular groove.

[0053] With the above solution, when the valve stem 22 rotates, the stopper 25 is synchronously driven to rotate in the inner cavity of the annular groove, and the annular groove ensures the smooth movement of the stopper 25.

[0054] like Figure 3 and Figure 4 As shown, the inner wall of the second valve body 3 away from the port of the first valve body 21 is provided with an oblique angle, and the inner bottom of the inner cavity of the second valve body 3 is provided with a straight groove for moving the moving component 6.

[0055] like Figure 7 , Fig.10 and Fig.11 As shown, four groups of rectangular plates 43 are provided, and the four groups of rectangular plates 43 are elastically connected to the cross plate 41 through arc springs 45. The end of the fixed plate 47 away from the rectangular plate 43 is triangular, and the fixed plate 46 is movably clamped on the cross plate 41;

[0056] When the fixed plate 46 is rotated by an external force, the four rectangular plates 43 will respectively pull the four flexible folding plates 42 to unfold simultaneously.

[0057] By adopting the above solution, the triangular design of the outer end of the fixing plate 47 reduces the continuous impact force of the water flow on the device.

[0058] like Fig.12 and Fig.15 As shown, the movable module 5 includes a fixed block 51, which is fixed to the inner wall of the second valve body 3, and a top block 52 is hinged at one end of the fixed block 51. The top block 52 is elastically connected to the fixed block 51 through a spring 54, and a round rod 53 is installed on one side of the top block 52 close to the fixed block 51;

[0059] The side of the top block 52 away from the round rod 53 is hemispherical and has a smooth surface. The end of the round rod 53 away from the top block 52 abuts against the abutment plate 44.

[0060] The contact ends of the abutment plate 44 and the round rod 53 are formed with an oblique angle.

[0061] With the above solution, the angled end of the plate 44 contacts the end of the round rod 53, which will cause the end of the round rod 53 to move under force at the angle of the plate 44, and the hemispherical side of the top block 52 will contact the water flow head-on. Fig.14 , the water will flow outward along the hemispherical surface of the top block 52 due to the hemispherical design.

[0062] like Figures 7 to 9 As shown, the moving assembly 6 includes a push rod 61 , one end of which is in contact with the stop block 25 , and the upper end of the push rod 61 is fixedly connected to the screw 63 near the side wall of the buffer module 4 .

[0063] like Figure 6 and Figure 8 As shown, the bottom end of the push rod 61 is slidably connected to the inside of the first valve body 21 and the second valve body 3, and the push rod 61 is elastically connected to the second valve body 3 through a spring telescopic tube 62; both sides of the push rod 61 and the abutment end of the abutment block 25 are provided with bevels, and the push rod 61 has an "L" shape.

[0064] The above solution is adopted: the bevels on both sides of the contact end of the push rod 61 and the stop block 25 are opened, so that when the stop block 25 rotates, it can smoothly abut the bevel of the push rod 61, causing the push rod 61 to move to the side away from the stop block 25. The "L"-shaped design allows the push rod 61 to be close to one side of the cross plate 41, reducing the impact of water flow on the push rod 61.

[0065] like Fig.14 As shown, the rectangular plate 43 is driven by an external force to unfold the flexible folding plate 42, so that the unfolded flexible folding plate 42 occupies half of the area between two adjacent cross plate 41 brackets, and when the top block 52 is flipped by the abutment plate 44, the top block 52 is located in the other half of the area between the two adjacent cross plate 41 brackets.

[0066] The above solution is adopted: the flexible folding plate 42 is made of high-strength flexible material to ensure that it can be reused multiple times. At the same time, the interval between the rectangular plate 43 and the fixed plate 47 is sufficient to ensure that when the rectangular plate 43 moves toward the side close to the fixed plate 47, the flexible folding plate 42 can be collected in the area between the rectangular plate 43 and the fixed plate 47.

[0067] The working principle and use process of the present invention:

[0068] First, when the butterfly plate 24 is not closed, the water flow inside the pipeline 1 flows normally through the inner cavity of the first valve body 21 and the second valve body 3. When the cut-off instruction causes the driving device 23 to drive the butterfly plate 24 to close through the valve stem 22, the valve stem 22 will first drive the stop block 25 to rotate. When the stop block 25 rotates, it will contact the angled port of the push rod 61, so that the push rod 61 moves away from the valve stem 22. During the movement of the push rod 61, the screw rod 63 is synchronously driven to move inside the fixed plate 46 and the cross plate 41. Due to the threaded sleeve connection between the screw rod 63 and the fixed plate 46 and the movable connection between the screw rod 63 and the cross plate 41, the screw rod 63 will drive the fixed plate 46 to rotate when it moves.

[0069] When the fixed plate 46 rotates, the outer wall of the fixed plate 46 drives the four rectangular plates 43 to rotate synchronously, and the rectangular plate 43 pulls one end of the flexible folding plate 42, so that the flexible folding plate 42 is unfolded between two adjacent cross plate 41 brackets, and the unfolding range is half of the area between the two adjacent cross plates 41. Fig.14 After the four flexible folding plates 42 are unfolded, the continuously flowing water flow will be blocked to prevent the water flow from directly impacting the butterfly plate 24 that is about to be closed in a large area, thereby achieving early closing buffer;

[0070] Secondly, when the cross plate 41 rotates, the support plate 44 will be driven to rotate in the same direction. During the rotation process, the support plate 44 will gradually contact the round rod 53. When the end of the support plate 44 with the bevel comes into contact with the end of the round rod 53, the end of the round rod 53 is forced to move on the bevel of the support plate 44 due to the continuous rotation of the support plate 44, so that the top block 52 rotates around the contact end of the fixed block 51 and the top block 52. At this time, the hemispherical apex of the top block 52 will be in the same horizontal plane as the cross plate 41, and the hemispherical side of the top block 52 will be in direct contact with the water flow. For details, refer to Fig.14 At the same time, when the water flow hits the hemispherical side of the top block 52, the water flow will flow outward along the hemispherical surface of the top block 52 due to the hemispherical design;

[0071] When the four flexible folding plates 42 are unfolded at the same time to partially block and buffer the water flow, the water flow in the blocked area will continue to impact the flexible folding plates 42, and the water flow in the unblocked area will impact the flipped top block 52. The water flow expands along the hemisphere of the top block 52 to prevent the water flow in the unblocked area from continuously impacting a specific area of ​​the butterfly plate 24.

[0072] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A marine lug vulcanized butterfly valve, comprising a pipeline (1) and a butterfly valve body (2), characterized in that: Also includes: A second valve body (3), the second valve body (3) being mounted on one side of the butterfly valve body (2) and sleeved in the inner cavity of the pipeline (1); A buffer module (4), wherein the buffer module (4) is arranged inside the second valve body (3); Active modules (5), the active modules (5) being distributed in an annular manner and at equal angles on the inner wall of the first valve body (21); The butterfly valve body (2) comprises a first valve body (21), the inner wall of the first valve body (21) is movably connected to a butterfly plate (24), the interior of the butterfly plate (24) is fixedly connected to a valve stem (22), the outer wall of the lower end of the valve stem (22) is fixedly connected to a stop block (25), and the outer wall of the first valve body (21) is fixedly connected to the second valve body (3); The buffer module (4) comprises a cross plate (41) fixedly connected to the inner cavity of the second valve body (3); the side wall of the cross plate (41) is fixedly provided with an annularly distributed fixed plate (47); one side of the fixed plate (47) is fixedly provided with a flexible folding plate (42); the flexible folding plate (42) is located on the outer side of the cross plate (41) and is movably connected to the cross plate (41); one end of the flexible folding plate (42) away from the fixed plate (47) is fixedly provided with a rectangular plate (43); the rectangular plate (43) is movably connected to the cross plate (41); the central end of the rectangular plate (43) is fixedly provided with a fixed disk (46); the inner cavity of the fixed disk (46) is provided with a moving component (6); and a stop plate (44) is installed on the side wall of the rectangular plate (43) away from the flexible folding plate (42); The moving assembly (6) comprises a screw rod (63), the screw rod (63) passes through the fixed plate (46) and the cross plate (41), and the screw rod (63) is threadedly sleeved with the fixed plate (46); The movable module (5) comprises a fixed block (51), the fixed block (51) being fixedly connected to the inner wall of the second valve body (3), a top block (52) being hingedly connected to one end of the fixed block (51), the top block (52) being elastically connected to the fixed block (51) via a spring (54), and a round rod (53) being installed on one side of the top block (52) close to the fixed block (51); The side of the top block (52) away from the round rod (53) is hemispherical and has a smooth surface, and the end of the round rod (53) away from the top block (52) abuts against the abutment plate (44); The contact ends of the abutment plate (44) and the round rod (53) are provided with an oblique angle; The moving assembly (6) further comprises a push rod (61), one end of which is in contact with the stop block (25), and the upper end of the push rod (61) is fixedly connected to the screw rod (63) near the side wall of the buffer module (4); Both sides of the push rod (61) and the abutting end of the abutting block (25) are provided with beveled angles, and the push rod (61) is in an "L" shape; The rectangular plate (43) is driven by an external force to unfold the flexible folding plate (42), so that the unfolded flexible folding plate (42) occupies one-half of the area between two adjacent cross plate (41) brackets, and when the top block (52) is turned over by the abutment plate (44), the top block (52) is located in the other half of the area between the two adjacent cross plate (41) brackets.

2. The marine lug vulcanized butterfly valve according to claim 1, characterized in that: A driving device (23) is installed on the top of the first valve body (21), and an annular groove is provided inside the first valve body (21) for enabling a stopper (25) to rotate about the valve stem (22) as an axis, and the stopper (25) is movably connected to the inner wall of the annular groove.

3. The marine lug vulcanized butterfly valve according to claim 1, characterized in that: An inner wall of the second valve body (3) away from the port of the first valve body (21) is provided with an oblique angle, and a straight groove for moving the moving component (6) is provided inside the bottom end of the inner cavity of the second valve body (3).

4. The marine lug vulcanized butterfly valve according to claim 1, characterized in that: Four groups of rectangular plates (43) are provided, and the four groups of rectangular plates (43) are elastically connected to the cross plate (41) via arc springs (45); one end of the fixed plate (47) away from the rectangular plate (43) is triangular in shape, and the fixed plate (46) is movably clamped on the cross plate (41); When the fixed disk (46) is rotated by an external force, the four rectangular plates (43) will respectively pull the four flexible folding plates (42) to unfold simultaneously.

5. The marine lug vulcanized butterfly valve according to claim 1, characterized in that: The bottom end of the push rod (61) is slidably connected to the inside of the first valve body (21) and the second valve body (3), and the push rod (61) is elastically connected to the second valve body (3) via a spring expansion tube (62).

Images