A dual piston balanced pressure relief valve

Abstract

The application belongs to the field of pressure relief valves, and particularly relates to a double-piston balanced pressure relief valve to solve the problem of large pressure that a spring needs to bear and large loss of the spring when the pressure relief valve is opened, which comprises a valve body, a valve cover and a valve core structure arranged between the valve body and the valve cover. An inlet and an outlet are formed on the valve body, and a partition is arranged in the valve body to separate the inlet and the outlet. A pressure relief port is formed on the partition. The valve cover is detachably connected to the valve body. The valve core structure comprises a valve flap, a spring and a driving assembly. The driving assembly forms a sealed pressure bearing space, and the pressure bearing space is in communication with the inlet. The spring and the driving assembly drive the valve flap to move to block the pressure relief port. According to the application, the spring and the driving assembly simultaneously act on the valve flap to block the pressure relief port. The spring can be a spring with small rigidity. When the pressure relief valve is opened, the spring does not need to bear large pressure, the loss of the spring is small, and the spring is protected.

Description

Technical Field

[0001] This application belongs to the field of pressure relief valves, and more specifically, relates to a dual-piston balanced pressure relief valve. Background Technology

[0002] Pressure relief valves automatically open and close based on the system's operating pressure. They are typically installed on equipment or pipelines in closed systems to protect system safety. When the pressure inside the equipment or pipeline exceeds the valve's set pressure, it automatically opens to release pressure, ensuring that the pressure of the medium inside the equipment and pipeline remains below the set pressure, thus protecting the equipment and pipeline and preventing accidents.

[0003] The most common type of pressure relief valve is the spring-loaded pressure relief valve. The spring force creates a seal between the valve disc and the valve seat. When the pressure in the pipeline is greater than the spring force, the valve disc separates from the valve seat, and the pressure relief valve opens. After the pressure in the pipeline drops, the spring pushes the valve disc to contact the valve seat, causing the pressure relief valve to close.

[0004] The existing related technologies have the following problems: In the initial state, the spring pushes the valve disc to abut against the valve seat, and the pressure relief valve is in the closed state at this time. In order for the pressure relief valve to withstand a large pressure, a spring with a large stiffness is required. When the pressure relief valve is opened, the spring needs to withstand a large pressure, which causes a large wear on the spring and requires the spring to be replaced regularly. Summary of the Invention

[0005] In order to reduce the pressure on the spring when the pressure relief valve is in the open state, this application provides a dual-piston balanced pressure relief valve.

[0006] The dual-piston balanced pressure relief valve provided in this application adopts the following technical solution:

[0007] A dual-piston balanced pressure relief valve includes a valve body, a valve cover, and a valve core structure disposed between the valve body and the valve cover. The valve body has an inlet and an outlet, and a separator is disposed inside the valve body to separate the inlet and the outlet. The separator has a pressure relief port. The valve cover is detachably connected to the valve body. The valve core structure includes a valve disc, a spring, and a drive assembly. The drive assembly forms a sealed pressure-bearing space, and the pressure-bearing space is connected to the inlet. The spring and the drive assembly drive the valve disc to move and block the pressure relief port.

[0008] By adopting the above technical solution, the pressure relief valve is installed in the pipeline. The medium enters the valve body from the inlet, and the drive component stores the medium at the inlet. The spring and the drive component act on the valve disc at the same time, and the pressure in the pressure-bearing space is the same as that at the inlet, which blocks the pressure relief port. Therefore, a spring with a small stiffness can be used. When the pressure relief valve is opened, it needs to resist the force of the spring and the drive component at the same time. The spring does not need to bear a large pressure, so the wear on the spring is small, which protects the spring.

[0009] As a further preferred embodiment, the drive assembly includes an upper valve shaft, a lower valve shaft, an upper piston, a lower piston, and a connecting pipe. The upper valve shaft and the lower valve shaft are coaxially arranged, the valve disc is coaxially arranged on the lower valve shaft, the upper piston and the lower piston are coaxially sleeved on the outside of the upper valve shaft, a sealed cavity is formed between the upper piston and the lower piston, and the connecting pipe is used to connect the sealed cavity and the inlet.

[0010] By adopting the above technical solution, the imported medium enters the sealed cavity between the upper piston and the lower piston through the connecting pipe. The upper piston and the lower piston are connected as a whole through the upper valve shaft, so that the upper piston and the lower piston move synchronously to ensure the sealing of the sealed cavity.

[0011] As a further preferred embodiment, the area of ​​the lower piston is larger than the area of ​​the upper piston, and the area of ​​the lower piston is smaller than the sum of the areas of the upper piston and the lower piston.

[0012] By adopting the above technical solution, since the area of ​​the lower piston is larger than that of the upper piston, the downward force is greater. At the same time, with the downward force of the spring, the upper valve shaft pushes the lower valve shaft to close the pressure relief port. When the pressure relief valve opens, the pressure on the spring is the upward force of the upper piston and the valve disc minus the downward force of the lower piston, thus completing the pressure relief. The structure is ingenious and the effect is good.

[0013] As a further preferred embodiment, a limiting member is provided on the upper valve shaft, the limiting member is located between the upper piston and the lower piston, both the upper piston and the lower piston abut against the limiting member, a nut is threadedly connected to the upper valve shaft, the nut abuts against the upper piston, the upper valve shaft is threadedly connected to the lower valve shaft, and the lower valve shaft abuts against the lower piston.

[0014] By adopting the above technical solution, the nut and the limiting component fix the position of the upper piston, and the lower valve shaft and the limiting component fix the position of the upper piston, thereby determining the relative position between the upper piston and the lower piston, enabling the upper piston and the lower piston to move stably at the same time with the upper valve shaft, and thus the force on the upper piston and the lower piston is more stable.

[0015] As a further preferred embodiment, the drive assembly further includes a lower cylinder and an upper cylinder, which are disposed between the valve body and the valve cover. The lower piston is in contact with the inner wall of the lower cylinder, and the upper piston is in contact with the inner wall of the upper cylinder. The valve cover and the valve body are connected by bolts.

[0016] By adopting the above technical solution, when the valve cover and valve body are connected by bolts, the lower cylinder and the upper cylinder are clamped and fixed, the lower piston is in contact with the inner wall of the lower cylinder, and the upper piston is in contact with the inner wall of the upper cylinder, thereby forming a sealed space between the upper piston and the lower piston.

[0017] As a further preferred embodiment, the valve body has a first mounting groove for the lower cylinder to be inserted, the lower cylinder has a second mounting groove for the upper cylinder to be inserted, and the valve cover has a third mounting groove for the upper cylinder to be inserted.

[0018] By adopting the above technical solution, the lower cylinder is embedded in the first mounting groove on the valve body during installation, the upper cylinder is embedded in the second mounting groove of the lower valve body during installation, and the upper cylinder is embedded in the third mounting groove during valve cover installation, thereby improving the installation stability between the valve body, lower cylinder, upper cylinder, and valve cover.

[0019] As a further preferred embodiment, a first sealing element is provided between the lower cylinder body and the valve body and the upper cylinder body, a second sealing element is provided between the upper piston and the lower piston and the upper valve shaft, and a third sealing element is provided on the outer peripheral wall of the upper piston and the lower piston.

[0020] By adopting the above technical solution, the first sealing element improves the sealing performance between the lower cylinder and the upper cylinder, the second sealing element improves the sealing performance between the upper piston and the lower piston and the upper valve shaft, and the third sealing element improves the sealing performance between the upper piston and the upper cylinder and between the lower piston and the lower cylinder, thereby improving the sealing performance of the sealed cavity.

[0021] As a further preferred embodiment, the valve body and the lower cylinder are provided with a first positioning groove adapted to the first seal, and the upper piston and the lower piston are each provided with a second positioning groove adapted to the second seal and a third positioning groove adapted to the third seal.

[0022] By adopting the above technical solution, the first seal, the second seal, and the third seal are respectively set in the corresponding first positioning groove, second positioning groove, and third positioning groove, which improves the installation stability and thus maintains a good sealing effect when the upper piston and the lower piston move.

[0023] As a further preferred embodiment, the spring is coaxially disposed between the valve cover and the upper piston, and the valve cover is provided with an adjustment component for adjusting the force exerted by the spring on the upper piston.

[0024] By adopting the above technical solution, the force exerted by the adjusting spring on the upper piston is adjusted to change the opening of the pressure relief valve at different pressures, making the pressure relief valve suitable for different pipelines and improving its applicability.

[0025] As a further preferred embodiment, the adjusting assembly includes a spring cover and a screw. The spring cover is disposed at the end of the spring away from the upper piston. The screw is threadedly connected to the valve cover and abuts against the spring cover. A first nut is threadedly connected to the screw and abuts against the valve cover.

[0026] By adopting the above technical solution, the screw can be rotated to tighten or loosen the spring cover, thereby adjusting the spring force, changing the force of the spring on the upper piston, and fixing the position of the screw through the first nut, making the position of the screw more stable.

[0027] As a further preferred embodiment, a sealing ring is provided on the side of the valve disc near the separator, the sealing ring abutting against the separator, and a locking assembly is provided on the lower valve shaft. The assembly includes a screw coaxially fixedly connected to the bottom of the lower valve shaft, the diameter of the screw being smaller than the diameter of the lower valve shaft, the valve disc being sleeved on the screw, and a limiting ring and a second nut being sleeved on the screw. The screw and the second nut are threadedly connected and adapted, and rotating the second nut causes the limiting ring to abut against the sealing ring.

[0028] By adopting the above technical solution, the sealing ring improves the sealing performance between the valve disc and the separator, making the valve disc better at sealing the pressure relief port. At the same time, the second nut fixes the sealing ring with the limiting ring, improving the installation stability of the sealing ring, and the valve disc is easy to disassemble for maintenance.

[0029] In summary, this application includes at least the following beneficial technical effects:

[0030] 1. By installing the pressure relief valve in the pipeline, the medium enters the valve body from the inlet, and the drive assembly stores the medium at the inlet. The spring and the drive assembly act on the valve disc at the same time, causing it to block the pressure relief port. Thus, the spring can be a spring with low stiffness. When the pressure relief valve is opened, it needs to resist the force of the spring and the drive assembly at the same time. The spring does not need to bear a large pressure, so the wear on the spring is small, which protects the spring.

[0031] 2. The imported medium enters the sealed cavity between the upper and lower pistons through the connecting pipe. Since the area of ​​the lower piston is larger than that of the upper piston, the downward force is greater. At the same time, the downward force of the spring causes the upper valve shaft to push the lower valve shaft to close the pressure relief port. When the pressure relief valve opens, the pressure on the spring is the upward force of the upper piston and the valve disc minus the downward force of the lower piston, thus completing the pressure relief. The structure is simple and ingenious, and the effect is good.

[0032] 3. By tightening or loosening the spring cover by rotating the screw, the spring force can be adjusted, changing the force of the spring on the upper piston. The position of the screw is fixed by the first nut, thereby changing the opening of the pressure relief valve at different pressures, making the pressure relief valve suitable for different pipelines and improving its applicability. Attached Figure Description

[0033] Figure 1 This is a front view structural diagram of an embodiment of this application;

[0034] Figure 2 This is a top view of an embodiment of the present application;

[0035] Figure 3 yes Figure 2 Schematic diagram of cross section along line AA;

[0036] Figure 4 yes Figure 3 Enlarged schematic diagram of section B in the middle;

[0037] Figure 5 yes Figure 4 Enlarged schematic diagram of section C.

[0038] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0039] 1. Valve body; 11. Inlet; 12. Outlet; 13. Separator; 131. Pressure relief port; 14. First mounting groove; 15. First seal; 16. First positioning groove; 2. Valve cover; 21. Third mounting groove; 3. Valve core structure; 31. Valve disc; 311. Sealing ring; 32. Spring; 33. Drive assembly; 331. Upper valve shaft; 3311. Limiting element; 3312. Nut; 332. Lower valve shaft; 333. Upper piston 3331, Second seal; 3332, Third seal; 3333, Second positioning groove; 3334, Third positioning groove; 334, Lower piston; 335, Connecting pipe; 336, Lower cylinder; 3361, Second mounting groove; 337, Upper cylinder; 4, Bolt; 5, Adjusting assembly; 51, Spring cover; 52, Screw; 53, First nut; 6, Locking assembly; 61, Screw; 62, Limiting ring; 63, Second nut. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0041] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0042] This application discloses a dual-piston balanced pressure relief valve.

[0043] A dual-piston balanced pressure relief valve includes a valve body 1, a valve cover 2, a valve core structure 3, and bolts 4. The valve core structure 3 is disposed between the valve body 1 and the valve cover 2, and the valve body 1 and the valve cover 2 are fixedly connected as a whole by the bolts 4. The valve body 1 has an inlet 11 and an outlet 12. A separator 13 for separating the inlet 11 and the outlet 12 is fixedly connected inside the valve body 1. The separator 13 has a pressure relief port 131, which is blocked and closed by the valve core structure 3. When the valve body 1 is installed in a pipeline, the pressure relief port 131 opens when the pressure in the pipeline is high, thereby reducing the pressure in the pipeline.

[0044] In order to block the pressure relief port 131, in this embodiment, the valve core structure 3 includes a valve disc 31, a spring 32 and a drive assembly 33. The drive assembly forms a sealed pressure-bearing space, and the pressure-bearing space is connected to the inlet 11. The spring 32 and the drive assembly 33 simultaneously drive the valve disc 31 to move and block the pressure relief port 131. The spring 32 can be a specification with relatively low stiffness.

[0045] Drive assembly 33 includes an upper valve shaft 331, a lower valve shaft 332, an upper piston 333, a lower piston 334, a connecting pipe 335, a lower cylinder 336, and an upper cylinder 337. The lower cylinder 336 and the upper cylinder 337 are arranged sequentially from bottom to top between the valve body 1 and the valve cover 2. To improve installation stability, the valve body 1 has a first mounting groove 14 for the lower cylinder 336 to be inserted, the lower cylinder 336 has a second mounting groove 3361 for the upper cylinder 337 to be inserted, and the valve cover 2 has a third mounting groove 21 for the upper cylinder 337 to be inserted. When the lower cylinder 336 is installed, it is inserted into the first mounting groove on the valve body 1. In step 14, the upper cylinder body 337 is embedded in the second mounting groove 3361 of the lower valve body 1. When installing the valve cover 2, the upper cylinder body 337 is embedded in the third mounting groove 21. Then, the valve body 1 and the valve cover 2 are connected by bolts 4, which improves the stability of the installation between the valve body 1, the lower cylinder body 336, the upper cylinder body 337, and the valve cover 2. A first sealing element 15 is provided between the lower cylinder body 336 and the valve body 1 and the upper cylinder body 337. A first positioning groove 16 is opened on the valve body 1 and the lower cylinder body 336 to fit the first sealing element 15, thereby improving the sealing between the lower cylinder body 336 and the valve body 1 and the upper cylinder body 337.

[0046] The lower piston 334 fits against the inner wall of the lower cylinder 336, and the upper piston 333 fits against the inner wall of the upper cylinder 337. Both the upper piston 333 and the lower piston 334 are coaxially sleeved on the outside of the upper valve shaft 331. A limiting member 3311 is integrally formed in the middle of the upper valve shaft 331, located between the upper piston 333 and the lower piston 334. Both the upper piston 333 and the lower piston 334 abut against the limiting member 3311. Specifically, a nut 3312 is threaded onto the upper valve shaft 331. By rotating the nut 3312, it abuts against the upper piston 333, pushing the upper piston 333 against the limiting member 3311. The upper valve shaft 331 and the lower valve shaft 332 are coaxially arranged, and the upper valve shaft 331... 31 is threadedly connected to the lower valve shaft 332. By rotating the lower valve shaft 332, it abuts against the lower piston 334. The lower valve shaft 332 pushes the lower piston 334 to abut against the limiting member 3311. The valve disc 31 is coaxially arranged on the lower valve shaft 332, thereby fixing the relative positions of the upper piston 333, lower piston 334, upper valve shaft 331, lower valve shaft 332 and valve disc 31. A sealed cavity is formed between the upper piston 333, lower piston 334 and upper cylinder 337, lower cylinder 336. The spring 32 is coaxially arranged between the upper piston 333 and valve cover 2. The area of ​​the lower piston 334 is larger than the area of ​​the upper piston 333, and the area of ​​the lower piston 334 is smaller than the sum of the areas of the upper piston 333 and the lower piston 334.

[0047] To improve the sealing performance of the sealed cavity, a second sealing element 3331 is provided between the upper piston 333 and the lower piston 334 and the upper valve shaft 331. A third sealing element 3332 is provided on the outer peripheral wall of the upper piston 333 and the lower piston 334. A second positioning groove 3333 that fits into the second sealing element 3331 and a third positioning groove 3334 that fits into the third sealing element 3332 are provided on the upper piston 333 and the lower piston 334. In this embodiment, the first sealing element 15, the second sealing element 3331 and the third sealing element 3332 are all sealing rings made of rubber. During the movement of the upper piston 333 and the lower piston 334, the positions of the second sealing element 3331 and the third sealing element 3332 are stable, maintaining a good sealing effect.

[0048] The connecting pipe 335 is used to connect the sealed cavity and the inlet 11. Specifically, the valve body 1 has a connecting port at the inlet 11 and the lower cylinder 336. Both ends of the connecting pipe 335 are provided with flanges, which are connected to the valve body 1 and the lower cylinder 336 to achieve the connection between the sealed cavity and the inlet 11. The medium at the inlet 11 enters the sealed cavity between the upper piston 333 and the lower piston 334 through the connecting pipe 335. Since the area of ​​the lower piston 334 is larger than that of the upper piston 333, the downward force is larger. At the same time, with the downward force of the spring 32, the upper valve shaft 331 pushes the lower valve shaft 332 to close the pressure relief port 131. When the pressure relief valve is opened, the pressure on the spring 32 is the upward force of the upper piston 333 and the valve shaft 31 minus the downward force of the lower piston 334, thus completing the pressure relief. The pressure on the spring 32 is small, and the wear on the spring 32 is small.

[0049] To improve the sealing effect of valve disc 31 on pressure relief port 131, a sealing ring 311 is provided on the side of valve disc 31 near the separator 13, and a groove for the sealing ring 311 to be embedded is provided on valve disc 31. The sealing ring 311 abuts against the separator 13. A locking assembly 6 is provided on the lower valve shaft 332 to fix valve disc 31 and sealing ring 311. In this embodiment, locking assembly 6 includes a screw 61 coaxially fixedly connected to the bottom of lower valve shaft 332. The diameter of screw 61 is smaller than the diameter of lower valve shaft 332. Valve disc 31 is sleeved on screw 61. A rubber sealing ring is also provided between valve disc 31 and screw 61. A limiting ring 62 and a second nut 63 are sleeved on screw 61. Screw 61 and second nut 63 are threadedly connected and adapted. Rotating second nut 63 causes limiting ring 62 to abut against sealing ring 311, thereby fixing valve disc 31 and sealing ring 311.

[0050] To make the pressure relief valve suitable for environments with different pressure pipelines, the valve cover 2 is provided with an adjustment component 5 for adjusting the force of the spring 32 on the upper piston 333. In this embodiment, the adjustment component 5 includes a spring cover 51 and a screw 52. The spring cover 51 is located at the end of the spring 32 away from the upper piston 333. The screw 52 is threadedly connected to the valve cover 2 and abuts against the spring cover 51. A first nut 53 is threadedly connected to the screw 52 and abuts against the valve cover 2. Rotating the screw 52 can tighten or loosen the spring cover 51, thereby adjusting the spring force of the spring 32, changing the force of the spring 32 on the upper piston 333, and changing the opening of the pressure relief valve at different pressures to complete the pressure relief.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual piston balanced pressure relief valve characterized by: The valve body (1), the valve cover (2), and the valve core structure (3) arranged between the valve body (1) and the valve cover (2); The valve body (1) is provided with an inlet (11) and an outlet (12), and the inside of the valve body (1) is provided with a partition (13) for separating the inlet (11) and the outlet (12), and the partition (13) is provided with a pressure relief port (131); The valve cover (2) is detachably connected to the valve body (1); The valve core structure (3) includes a valve flap (31), a spring (32), and a drive assembly (33), the drive assembly (33) forms a sealed pressure-bearing space, and the pressure-bearing space is in communication with the inlet (11), the spring (32) and the drive assembly (33) drive the valve flap (31) to move to block the pressure relief port (131); The drive assembly (33) includes an upper valve shaft (331), a lower valve shaft (332), an upper piston (333), a lower piston (334), and a communication pipe (335), the upper valve shaft (331) and the lower valve shaft (332) are coaxially arranged, the valve flap (31) is arranged on the lower valve shaft (332), the upper piston (333) and the lower piston (334) are both sleeved on the outside of the upper valve shaft (331), a closed cavity is formed between the upper piston (333) and the lower piston (334), and the closed cavity and the inlet (11) are communicated through the communication pipe (335); The area of the lower piston (334) is greater than the area of the upper piston (333), and the area of the lower piston (334) is less than the sum of the areas of the upper piston (333) and the lower piston (334); A limiting piece (3311) is arranged on the upper valve shaft (331), the limiting piece (3311) is located between the upper piston (333) and the lower piston (334), and the upper piston (333) and the lower piston (334) are in abutment with the limiting piece (3311).

2. A dual piston balanced pressure relief valve according to claim 1, characterized in that: A nut (3312) is threadedly connected to the upper valve shaft (331), the nut (3312) is in abutment with the upper piston (333), the upper valve shaft (331) is threadedly connected with the lower valve shaft (332), and the lower valve shaft (332) is in abutment with the lower piston (334).

3. A dual piston balanced pressure relief valve according to claim 1, wherein: The drive assembly (33) further includes a lower cylinder body (336) and an upper cylinder body (337), the lower cylinder body (336) and the upper cylinder body (337) are arranged between the valve body (1) and the valve cover (2), the lower piston (334) is in abutment with the inner wall of the lower cylinder body (336), the upper piston (333) is in abutment with the inner wall of the upper cylinder body (337), and the valve cover (2) and the valve body (1) are connected through bolts (4).

4. A dual piston balanced pressure relief valve according to claim 3, wherein: A first mounting groove (14) is arranged on the valve body (1) for embedding the lower cylinder body (336), a second mounting groove (3361) is arranged on the lower cylinder body (336) for embedding the upper cylinder body (337), and a third mounting groove (21) is arranged on the valve cover (2) for embedding the upper cylinder body (337).

5. A dual piston balanced pressure relief valve according to claim 3, wherein: The lower cylinder body (336) is provided with a first sealing element (15) between the valve body (1) and the upper cylinder body (337), the upper piston (333) and the lower piston (334) are provided with a second sealing element (3331) between the upper valve shaft (331), and the outer peripheral wall of the upper piston (333) and the lower piston (334) is provided with a third sealing element (3332).

6. A dual piston balanced pressure relief valve according to claim 1, wherein: The spring (32) is coaxially arranged between the valve cover (2) and the upper piston (333), and the valve cover (2) is provided with an adjusting assembly (5) for adjusting the force of the spring (32) acting on the upper piston (333).

7. A dual piston balanced pressure relief valve according to claim 6, wherein: The adjusting assembly (5) comprises a spring cover (51) and a screw (52), the spring cover (51) is arranged at one end of the spring (32) away from the upper piston (333), the screw (52) is threadedly connected with the valve cover (2), and the screw (52) abuts against the spring cover (51).

8. A dual piston balanced pressure relief valve according to claim 7, wherein: The screw (52) is threadedly connected with a first nut (53), and the first nut (53) abuts against the valve cover (2).

9. A dual piston balanced pressure relief valve as defined in claim 1 wherein: The valve disc (31) is provided with a sealing ring (311) on one side close to the partition (13), and the sealing ring (311) abuts against the partition (13).

10. A dual piston balanced pressure relief valve according to claim 9, wherein: The lower valve shaft (332) is provided with a locking assembly (6), the assembly comprises a screw rod (61) coaxially and fixedly connected to the bottom of the lower valve shaft (332), the diameter of the screw rod (61) is smaller than that of the lower valve shaft (332), the valve disc (31) is sleeved on the screw rod (61), the screw rod (61) is sleeved with a limiting ring (62) and a second nut (63), the screw rod (61) is threadedly connected with the second nut (63), and rotating the second nut (63) makes the limiting ring (62) abut against the sealing ring (311).

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