Novel pneumatic stop valve

Abstract

The utility model provides a novel pneumatic stop valve which comprises a valve body, a valve element assembly and an air cylinder. A water inlet cavity, a water passing cavity and a water outlet cavity which are connected in sequence are formed in the valve body; a detachable pressing sleeve is arranged at the top of the water outlet cavity; the valve element assembly comprises a valve seat, a valve sleeve and a valve rod. The valve seat is arranged in the outlet end of the water passing cavity and abuts against the top of the water passing cavity. The bottom of the valve sleeve abuts against the top of the valve seat, and a sealing part is formed on the top of the valve seat. The valve rod is arranged in the valve sleeve, and a valve head corresponding to the sealing part is arranged at the bottom end of the valve rod; the valve rod penetrates through the pressing sleeve, and the top of the valve rod is located above the pressing sleeve. The air cylinder comprises a cylinder body and a piston arranged in the cylinder body in a sliding mode. The top of the valve rod is located in the cylinder body. The valve rod is arranged in the middle of the piston in a penetrating mode and fixedly connected with the piston. The pneumatic stop valve has the advantages of light weight, compact structure, convenience in installation and maintenance, rapidness in opening and closing and long service life.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a novel pneumatic shut-off valve. Background Technology

[0002] In low-pressure rolling mill systems, valve performance directly impacts the stability and efficiency of the production line. Currently, the most common valves are water curtain valves and butterfly valves. Traditionally, water curtain valves have been widely used due to their excellent sealing performance, but their drawbacks—large weight, complex structure, and high installation and maintenance costs—are becoming increasingly apparent. On the other hand, while butterfly valves are relatively simple in structure, they often cannot meet the demands for rapid response and high-frequency operation in terms of opening and closing speed and service life.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of this utility model is to provide a new type of pneumatic shut-off valve, which is lightweight, compact in structure, easy to install and maintain, and has the advantages of rapid switching and long service life.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A novel pneumatic shut-off valve includes a valve body, a valve core assembly, and a cylinder;

[0007] The valve body is provided with an inlet chamber, a through chamber, and an outlet chamber connected in sequence; the top of the outlet chamber is provided with a detachable pressure sleeve;

[0008] The valve core assembly includes a valve seat, a valve sleeve, and a valve stem; the valve seat is located inside the outlet end of the water passage cavity, and the top of the valve seat abuts against the top of the water passage cavity; the bottom of the valve sleeve abuts against the top of the valve seat, the inner diameter of the valve seat is smaller than the inner diameter of the valve sleeve, and a sealing portion is formed at the top of the valve seat; a water passage hole is provided on the side wall of the valve sleeve; the valve stem is located inside the valve sleeve, and a valve head corresponding to the sealing portion is provided at the bottom end of the valve stem; the valve stem passes through the pressure sleeve and its top is located above the pressure sleeve;

[0009] The cylinder includes a cylinder body and a piston slidably disposed within the cylinder body; the cylinder body is disposed above the pressure sleeve, and the top of the valve stem is located within the cylinder body; the valve stem passes through the middle of the piston and is fixedly connected to the piston.

[0010] According to one embodiment of the present invention, the top of the pressure sleeve is provided with an annular support ring, and the cylinder body is provided on the top of the support ring; the pressure sleeve, the support ring and the cylinder body form a buffer cavity, and the support ring is provided with a drain hole communicating with the buffer cavity.

[0011] According to one embodiment of the present invention, the valve stem includes a small diameter section and a large diameter section connected sequentially from top to bottom; the bottom of the piston is engaged with the connection between the small diameter section and the large diameter section; the small diameter section is threadedly connected to a fixing nut, and the fixing nut abuts against the top surface of the piston.

[0012] According to one embodiment of the present invention, the outer end face of the fixing nut is provided with a positioning hole facing the valve stem, and a positioning screw is provided in the positioning hole, the positioning screw connecting the fixing nut and the valve stem together.

[0013] According to one embodiment of the present invention, the novel pneumatic shut-off valve further includes an adjusting assembly, which includes a positioning sleeve, a mounting base, an adjusting nut, and an adjusting screw; the top of the cylinder body is provided with a mounting hole, and the positioning sleeve is disposed in the mounting hole; the mounting base is disposed above the positioning sleeve and is fixedly connected to the cylinder body; the adjusting nut is disposed on the top of the mounting base; the positioning sleeve and the mounting base are provided with through holes corresponding to the screw holes of the adjusting nut; the adjusting screw passes through the through holes and is threadedly connected to the adjusting nut; the top end of the adjusting screw is provided with a rotating part, and the bottom end of the adjusting screw abuts against the top end of the valve stem.

[0014] According to one embodiment of the present invention, a noise-reducing sleeve is provided at the top of the valve stem, and the bottom end of the adjusting screw abuts against the noise-reducing sleeve.

[0015] According to one embodiment of the present invention, the valve head is provided with a first inclined surface on its outer side, the first inclined surface extending downward from the outside to the inside, and the sealing part is provided with a second inclined surface corresponding to the first inclined surface.

[0016] According to one embodiment of the present invention, the first inclined surface and the second inclined surface have an included angle, such that the bottom end of the first inclined surface abuts against the second inclined surface or the bottom end of the first inclined surface abuts against the bottom end of the second inclined surface.

[0017] According to one embodiment of the present invention, a sealing ring is provided between the pressure sleeve, the bottom of the cylinder body and the valve stem.

[0018] According to one embodiment of the present invention, the portion of the valve stem located inside the piston is provided with an annular groove, and a sealing ring is provided in the annular groove.

[0019] Compared with the prior art, the advantages and beneficial effects of the embodiments of this utility model are as follows:

[0020] The novel pneumatic shut-off valve provided in this embodiment uses a cylinder to drive the valve stem, enabling rapid opening and closing, shortening process time, significantly improving operating efficiency, extending service life, reducing replacement frequency, lowering maintenance costs, and making it more suitable for low-pressure rolling mill environments with limited space. It optimizes space utilization, provides precise control, ensures stable operation of the fluid system, and reduces downtime due to malfunctions. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an undue limitation of this utility model. Wherein:

[0022] Figure 1 A schematic diagram of the structure of the novel pneumatic shut-off valve provided in the embodiments of this utility model;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0025] Figure 4 for Figure 1 Enlarged view of point C in the middle;

[0026] Figure 5 A schematic diagram of the valve stem of the novel pneumatic shut-off valve provided in this embodiment of the utility model;

[0027] Figure 6 A schematic diagram of the valve sleeve of the novel pneumatic shut-off valve provided in an embodiment of this utility model;

[0028] Figure 7 A cross-sectional view of the valve sleeve of the novel pneumatic shut-off valve provided for an embodiment of this utility model;

[0029] Figure 8 A schematic diagram of the regulating assembly of the novel pneumatic shut-off valve provided in this embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Valve body; 11. Inlet chamber; 12. Passing chamber; 13. Outlet chamber; 14. Pressure sleeve; 141. Support ring; 142. Buffer chamber; 143. Drain hole; 2. Valve core assembly; 21. Valve seat; 211. Sealing part; 212. Second inclined surface; 22. Valve sleeve; 23. Valve stem; 231. Small diameter section; 232. Large diameter section; 233. Annular groove; 24. Water passage hole; 25. Valve head; 251. First inclined surface; 26. Fixing nut; 261. Positioning hole; 27. Positioning screw; 3. Cylinder; 31. Cylinder body; 311. Cylinder head; 312. Cylinder barrel; 313. Cylinder cover; 32. Piston; 4. Adjusting assembly; 41. Positioning sleeve; 42. Mounting seat; 43. Adjusting nut; 44. Adjusting screw; 45. Rotating part; 46. Noise reduction sleeve. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0033] In the description of this utility model, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0034] like Figure 1 , Figure 3 , Figure 6 , Figure 7As shown, this utility model embodiment provides a novel pneumatic shut-off valve, including a valve body 1, a valve core assembly 2, and a cylinder 3. For clarity, definitions are provided. Figure 1 The upper part is called "upper" and the lower part is called "lower". The valve body 1 has an inlet chamber 11, a through chamber 12, and an outlet chamber 13 connected in sequence. The top of the outlet chamber 13 is provided with a detachable pressure sleeve 14. The valve core assembly 2 includes a valve seat 21, a valve sleeve 22, and a valve stem 23. The valve seat 21 is located inside the outlet end of the through chamber 12, and the top of the valve seat 21 abuts against the top of the through chamber 12. The bottom of the valve sleeve 22 abuts against the top of the valve seat 21. The inner diameter of the valve seat 21 is smaller than the inner diameter of the valve sleeve 22, forming a sealing part 211 on the top of the valve seat 21. The side wall of the valve sleeve 22 is provided with a water passage hole 24. The valve stem 23 is located inside the valve sleeve 22, and the bottom end of the valve stem 23 is provided with a valve head 25 corresponding to the sealing part 211. The valve stem 23 passes through the pressure sleeve 14 and its top is located above the pressure sleeve 14. The cylinder 3 includes a cylinder body 31 and a piston 32 slidably disposed within the cylinder body 31. The cylinder body 31 is located above the pressure sleeve 14, and the top of the valve stem 23 is located within the cylinder body 31. The piston 32 divides the cylinder body 31 into an upper chamber and a lower chamber, and the cylinder body 31 is provided with an air passage (not shown in the figure) connecting the upper chamber and the lower chamber. The valve stem 23 passes through the middle of the piston 32 and is fixedly connected to the piston 32. When gas is introduced into the upper chamber or the lower chamber through an external air source and the air passage, the piston 32 can drive the valve stem 23 to move back and forth along the axial direction of the valve stem 23, thereby causing the valve head 25 at the lower part of the valve stem 23 to abut or disengage from the sealing part 211 of the valve seat 21, thus closing or opening the valve.

[0035] In use, the novel pneumatic shut-off valve provided in this embodiment allows water to enter the inlet chamber 11 from the inlet end of the valve body 1. Because the sealing part 211 of the valve seat 21 and the valve head 25 of the valve stem 23 abut against each other, water is prevented from entering the outlet chamber 13. Under the pressure of the water, the sealing part 211 of the valve seat 21 and the valve head 25 of the valve stem 23 disengage, and water enters the valve sleeve 22 and flows through the water passage 24 on the valve sleeve 22 to the outlet chamber 13. When the valve needs to be closed, the piston 32 moves downward under the action of the cylinder 3, and the valve stem 23 also moves downward along the axial direction. When the valve head 25 abuts against the sealing part 211, the valve closes, and water cannot flow into the outlet chamber 13. The novel pneumatic shut-off valve provided in this embodiment drives the valve stem 23 via the cylinder 3, enabling rapid opening and closing, shortening process time, significantly improving operating efficiency, extending service life, reducing replacement frequency, lowering maintenance costs, and its lightweight and compact structure is more suitable for low-pressure rolling mill environments with limited space, optimizing space utilization, providing precise control, ensuring stable operation of the fluid system, and reducing downtime due to malfunctions.

[0036] Furthermore, the valve seat 21 is sealed to the water passage chamber 12, and the valve sleeve 22 is sealed to the valve seat 21.

[0037] like Figure 1 , Figure 2 As shown, in one embodiment of this utility model, the pressure sleeve 14 has an annular support ring 141 at its top, and the cylinder body 31 is located on top of the support ring 141. The pressure sleeve 14, the support ring 141, and the cylinder body 31 together form a buffer cavity 142, and the support ring 141 has a drain hole 143 communicating with the buffer cavity 142. The pressure sleeve 14 and the valve stem 23 are sealed together by a seal. Even if the seal fails and causes medium leakage, the medium can enter the buffer cavity 142 and be guided to the ground or drainage ditch through the drain hole 143 to prevent the medium from entering the cylinder 3 and affecting the normal use of the pneumatic shut-off valve. At the same time, the drain hole 143 is opened circumferentially along the side wall of the pressure sleeve 14 and faces multiple directions. The drain hole 143 can detect leakage problems in time, reminding operators to take necessary maintenance measures and extend the service life of the pneumatic shut-off valve.

[0038] like Figure 1 , Figure 3 , Figure 5 As shown, in one embodiment of this utility model, the valve stem 23 includes a small-diameter section 231 and a large-diameter section 232 connected sequentially from top to bottom. The bottom of the piston 32 is engaged at the connection between the small-diameter section 231 and the large-diameter section 232. The small-diameter section 231 is threadedly connected to a fixing nut 26, which abuts against the top surface of the piston 32, thus fixing the piston 32 and the valve stem 23 together. Preferably, the outer end face of the fixing nut 26 is provided with a positioning hole 261 facing the valve stem, and a positioning screw 27 is provided in the positioning hole 261. The positioning screw 27 connects the fixing nut 26 and the valve stem 23 together, preventing the fixing nut 26 from rotating. During installation, thread-locking adhesive is applied to the outer thread of the positioning screw 27 before it is fixedly connected to the valve stem 23, thereby fixing the valve stem 23 and the fixing nut 26 together and preventing the fixing nut 26 from loosening and rotating.

[0039] In one embodiment of this utility model, the valve body 1, the valve sleeve 22, and the cylinder 31 can be cylindrical structures. The valve body 1 is provided with a standardized flange connection interface or a quick-clamp interface for easy connection to system pipelines.

[0040] like Figure 6 , Figure 7As shown, in one embodiment of this utility model, each water passage hole 24 is spaced apart along the circumference of the valve sleeve 22 on the outer wall of the valve sleeve 22. Further, the water passage hole 24 is a long strip with a uniform length and extends longitudinally along the central axis of the valve sleeve 22. The water passage hole 24 is located at the corresponding position of the water outlet cavity 13 to facilitate the medium to reach the water outlet cavity 13.

[0041] like Figure 4 As shown, to achieve a good sealing effect, in one embodiment of this utility model, the valve head 25 has a first inclined surface 251 on its outer side, which extends downwards from the outside to the inside. The sealing part 211 has a second inclined surface 212 corresponding to the first inclined surface 251. The first inclined surface 251 and the second inclined surface 212 can cooperate with each other to achieve the effect of valve closure. The first inclined surface 251 and the second inclined surface 212 form a surface-to-surface fit, which has an excellent sealing effect. The valve stem 23 is driven up and down by the cylinder 3, so that the first inclined surface 251 and the second inclined surface 212 abut against each other for sealing, realizing the valve's rapid shut-off function. Preferably, the first inclined surface 251 and the second inclined surface 212 have an angle between them, such that the bottom end of the first inclined surface 251 abuts against the bottom end of the second inclined surface 212, or the bottom end of the first inclined surface 251 abuts against the bottom end of the second inclined surface 212. The first inclined surface 251 and the second inclined surface 212 form a line-to-line fit, which further improves the anti-pollution ability between the two.

[0042] In one embodiment of this utility model, sealing rings are provided between the pressure sleeve 14, the bottom of the cylinder body 31, and the valve stem 23. Preferably, the inner and outer walls of the pressure sleeve 14 are respectively provided with inwardly recessed annular grooves, and a sealing element is provided in the groove. The pressure sleeve 14 is sealed to the valve stem 23 through the sealing element. Specifically, the sealing element is an effective piston rod compression type one-way seal, consisting of a U-shaped ring inlaid with a rubber energy-increasing element. At low pressure, the pre-compression of the sealing end face provides a low-pressure pre-tightening force to obtain an effective low-pressure seal. When the pressure increases, the rubber energy-increasing element applies force to the U-shaped ring, causing it to deform, increasing the sealing contact surface, thereby achieving a good sealing effect. Further, as... Figure 3 , Figure 5 As shown, the portion of the valve stem 23 located inside the piston 32 has an annular groove 233, and a sealing ring is provided within the annular groove 233. Preferably, the annular groove 233 is located in the middle of the piston 32.

[0043] like Figure 1As shown, in one embodiment of this utility model, the cylinder body 31 includes a cylinder head 311, a cylinder barrel 312, and a cylinder cover 313 connected sequentially from bottom to top. The lower end face of the cylinder head 311 is pressed against the upper end face of the pressure sleeve 14. The piston 32 is housed within the cylinder barrel 312 and is sealed to the cylinder barrel 312. The cylinder cover 313 is pressed against the upper end face of the cylinder barrel 312. The piston 32 is built into the cylinder barrel 312, and the outer surface of the piston 32 is movably and sealed to the inner diameter of the cylinder barrel 312. The side of the cylinder barrel 312 near the water outlet chamber 13 is sealed to the cylinder head 311. The cylinder head 311 and the pressure sleeve 14 surround and form the buffer chamber 142.

[0044] In one embodiment of this utility model, the valve body 1 is made of high-strength stainless steel and has a smooth fluid passage inside. Furthermore, the upper end face of the pressure sleeve 14 has a threaded hole for mounting screws during assembly. The screw cap is engaged in a countersunk hole on the concave end face of the cylinder body 31 of the cylinder 3 for assembly positioning to prevent interference with other components.

[0045] like Figure 1 , Figure 8 As shown, in one embodiment of this utility model, the novel pneumatic shut-off valve further includes an adjusting component 4, which includes a positioning sleeve 41, a mounting base 42, an adjusting nut 43, and an adjusting screw 44. The cylinder body 31 has a mounting hole at its top, and the positioning sleeve 41 is disposed within this mounting hole. The mounting base 42 is disposed above the positioning sleeve 41 and is fixedly connected to the cylinder body 31. The adjusting nut 43 is disposed on the top of the mounting base 42. The positioning sleeve 41 and the mounting base 42 have through holes corresponding to the screw holes of the adjusting nut 43. The adjusting screw 44 passes through the through holes and is threadedly connected to the adjusting nut 43. The top end of the adjusting screw 44 has a rotating part 45 (e.g., a nut), and the bottom end of the adjusting screw 44 abuts against the top end of the valve stem 23. By rotating the adjusting screw 44, the valve stem 23 can be manually adjusted to achieve the effect of opening and closing the valve, enabling manual adjustment of the pneumatic shut-off valve in emergencies, making it safer and more reliable. Preferably, a noise-reducing sleeve 46 is fitted on the top of the valve stem 23, and the bottom end of the adjusting screw 44 abuts against the noise-reducing sleeve 46 to reduce noise during operation.

[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel pneumatic shut-off valve, characterized in that, It includes a valve body (1), a valve core assembly (2), and a cylinder (3); The valve body (1) is provided with an inlet chamber (11), a water passage chamber (12), and an outlet chamber (13) connected in sequence; the top of the outlet chamber (13) is provided with a detachable pressure sleeve (14); The valve core assembly (2) includes a valve seat (21), a valve sleeve (22), and a valve stem (23); the valve seat (21) is located inside the outlet end of the water passage cavity (12), and the top of the valve seat (21) abuts against the top of the water passage cavity (12); the bottom of the valve sleeve (22) abuts against the top of the valve seat (21), the inner diameter of the valve seat (21) is smaller than the inner diameter of the valve sleeve (22), and a sealing part (211) is formed on the top of the valve seat (21); a water passage hole (24) is provided on the side wall of the valve sleeve (22); the valve stem (23) is located inside the valve sleeve (22), and a valve head (25) corresponding to the sealing part (211) is provided at the bottom end of the valve stem (23); the valve stem (23) passes through the pressure sleeve (14), and the top is located above the pressure sleeve (14); The cylinder (3) includes a cylinder body (31) and a piston (32) slidably disposed within the cylinder body (31); the cylinder body (31) is disposed above the pressure sleeve (14), and the top of the valve stem (23) is located within the cylinder body (31); the valve stem (23) passes through the middle of the piston (32) and is fixedly connected to the piston (32).

2. The novel pneumatic shut-off valve according to claim 1, characterized in that, The top of the pressure sleeve (14) is provided with an annular support ring (141), and the cylinder (31) is located on the top of the support ring (141); the pressure sleeve (14), the support ring (141) and the cylinder (31) form a buffer cavity (142), and the support ring (141) is provided with a drain hole (143) communicating with the buffer cavity (142).

3. The novel pneumatic shut-off valve according to claim 1, characterized in that, The valve stem (23) includes a small diameter section (231) and a large diameter section (232) connected sequentially from top to bottom; the bottom of the piston (32) is engaged at the connection between the small diameter section (231) and the large diameter section (232); the small diameter section (231) is connected to a fixing nut (26) by a thread, and the fixing nut (26) abuts against the top surface of the piston (32).

4. The novel pneumatic shut-off valve according to claim 3, characterized in that, The outer end face of the fixing nut (26) is provided with a positioning hole (261) facing the valve stem (23), and a positioning screw (27) is provided in the positioning hole (261). The positioning screw (27) connects the fixing nut (26) and the valve stem (23) together.

5. The novel pneumatic shut-off valve according to any one of claims 1 to 4, characterized in that, It also includes an adjustment assembly (4), which includes a positioning sleeve (41), a mounting base (42), an adjusting nut (43), and an adjusting screw (44); the top of the cylinder body (31) is provided with a mounting hole, and the positioning sleeve (41) is located in the mounting hole; the mounting base (42) is located above the positioning sleeve (41) and is fixedly connected to the cylinder body (31); the adjusting nut (43) is located on the top of the mounting base (42); the positioning sleeve (41) and the mounting base (42) are provided with through holes corresponding to the screw holes of the adjusting nut (43); the adjusting screw (44) passes through the through holes and is connected to the adjusting nut (43) by threads; the top end of the adjusting screw (44) is provided with a rotating part (45), and the bottom end of the adjusting screw (44) abuts against the top end of the valve stem (23).

6. The novel pneumatic shut-off valve according to claim 5, characterized in that, The valve stem (23) is provided with a noise reduction sleeve (46) at the top, and the bottom end of the adjusting screw (44) abuts against the noise reduction sleeve (46).

7. The novel pneumatic shut-off valve according to any one of claims 1 to 4, characterized in that, The valve head (25) has a first inclined surface (251) on its outer side, which extends downward from the outside to the inside. The sealing part (211) has a second inclined surface (212) corresponding to the first inclined surface (251).

8. The novel pneumatic shut-off valve according to claim 7, characterized in that, The first inclined plane (251) and the second inclined plane (212) have an angle, such that the bottom end of the first inclined plane (251) abuts against the second inclined plane (212) or the bottom end of the first inclined plane (251) abuts against the second inclined plane (212).

9. The novel pneumatic shut-off valve according to any one of claims 1 to 4, characterized in that, A sealing ring is provided between the bottom of the pressure sleeve (14), the cylinder body (31), and the valve stem (23).

10. The novel pneumatic shut-off valve according to any one of claims 1 to 4, characterized in that, The valve stem (23) located inside the piston (32) is provided with an annular groove (233), and a sealing ring is provided in the annular groove (233).

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