Valve switching mechanism and direct-type shut-off valve

Abstract

A valve opening / closing member and a direct-acting shutoff valve are provided with a valve flap, in which a valve body sealing gasket and a valve body sealing gasket fixing ring configured to fix the valve body sealing gasket to the valve flap are provided on one side of the valve flap in that order, the valve flap has a valve flap body, a male threaded post is provided concentrically below the valve flap body, the valve body sealing gasket fixing ring is provided with a female threaded hole to be screwed onto the male threaded post, and a sealing structure is provided on the side of the male threaded post away from the valve flap body, and the sealing structure prevents a medium from entering a gap between the male threaded post and the female threaded hole.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on July 13, 2023, with the application number 202310857048.3, and all the contents of this application are incorporated herein by reference.

[0002] This application relates to the technical field of direct-flow shut-off valves, for example, valve closing members and direct-flow shut-off valves.

Background Art

[0003] The direct-flow shut-off valve makes the sealing surface of the valve flap and the sealing surface of the valve seat adhere to each other by the pressure of the valve rod, blocks the flow of the medium, has characteristics such as small frictional force between the sealing surfaces during the opening and closing process, wear resistance, small opening height, and excellent manufacturing process performance. The direct-flow shut-off valve is most widely applied in the industrial field, especially in the sanitary and aseptic technical fields such as the production process of antibiotics.

[0004] When the direct-flow shut-off valve is applied to the production process of antibiotics, the inside of the valve body needs to maintain the characteristics of low roughness, low dead angles, and no liquid accumulation. Therefore, the direct-flow shut-off valve can be suitable for the cleaning forms of Cleaning In Place (CIP) and Sanitizing In Place (SIP). In the direct-flow shut-off valve in the related art, the valve flap is connected to the metal part by screwing or caulking to fix the valve body sealing gasket. However, when connected to the metal part in such a form, the gap between the screw pairs or the radial gap after caulking will both become dead angles, and the medium flowing in the shut-off valve cannot flow out after flowing into these gaps, leading to liquid accumulation inside the valve body and making cleaning difficult, thus affecting the environment of the sanitary and aseptic process in the production process of antibiotics.

Summary of the Invention

[0005] This application provides a valve opening / closing material and a direct-acting shut-off valve that can solve the problem in related technologies where a blind spot exists when the valve flap of a direct-acting shut-off valve is connected to a metal part and the valve body sealing gasket is fixed, preventing the medium from flowing out after it has entered.

[0006] In one embodiment of the present invention, a valve opening and closing member is provided with a valve flap, wherein a valve body sealing gasket and a valve body sealing gasket fixing ring configured to fix the valve body sealing gasket to the valve flap are provided in that order on one side of the valve flap. The valve flap comprises a valve flap body, a male screw column concentrically provided below the valve flap body, a female screw hole provided in the valve body sealing gasket fixing ring which is screwed onto the male screw column, and a sealing structure provided on the side of the male screw column away from the valve flap body, the sealing structure restricting the entry of a medium into the gap between the male screw column and the female screw hole, thereby providing a valve opening and closing material.

[0007] In one embodiment, the sealing structure comprises a cylinder, the area below the female screw hole is a cylindrical hole, and the cylinder is fastened and fitted into the cylindrical hole.

[0008] In one embodiment, the cylinder and the male screw column are integrally molded.

[0009] In one embodiment, the female screw hole is configured as a blind hole so as to seal one end of the female screw hole.

[0010] In one embodiment of the present invention, a direct-type shut-off valve comprising a valve body is provided, wherein the valve body is provided with two chambers communicating with the outside, each of the two chambers is provided with a branch passage, a shut-off cavity is provided at the point where the two chambers communicate, a valve port is provided at the point where the shut-off cavity communicates with one of the chambers, a valve shaft extending to the outside of the valve body passes through and is slidably connected to the shut-off cavity, and one end of the valve shaft located inside the valve body is fixedly connected to a valve flap body.

[0011] In one embodiment, an annular inclined channel is provided on the circumferential side of the valve opening, and the annular inclined channel is in communication with a shut-off chamber. Even when the valve flap body closes or opens the valve opening, one of the chambers is always maintained in communication with the shut-off chamber and is in communication with the annular inclined channel. Within the two chambers, branching paths are provided for the medium to flow out of and into the chamber, and the inner bottom of the annular inclined channel slopes to one side from a higher side to a lower side.

[0012] In one embodiment, the external communication points between the two chambers and the valve body are connected to the external pipeline by welding.

[0013] In one embodiment, the two chambers and the external communication points of the valve body are connected to an external pipeline by sanitary flanges, and the sanitary flanges, together with an O-type sealing ring via their uneven surfaces, seal the connection points between the valve body and the external pipeline.

[0014] In one embodiment, the valve body is provided with an opening that communicates with a shutoff cavity, a valve cover is sealed and connected to the opening via a sealing gasket, the valve cover is provided with a valve neck that communicates with the inside of the shutoff cavity, and the valve shaft slides and is sealed and connected within the valve neck.

[0015] In one embodiment, the space between the valve stem and the valve neck is sealed with a composite filler material. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram of a side cross-sectional structure according to one embodiment of the present invention. [Figure 2] This is a schematic diagram of the side cross-sectional structure of a straight-through shutoff valve according to one embodiment of the present invention. [Figure 3] This is a schematic diagram of the side cross-sectional structure of a second type sealing structure according to one embodiment of the present invention. [Figure 4] This is a schematic diagram of the side cross-sectional structure when the valve body sealing gasket fixing ring according to one embodiment of the present invention is not installed. [Figure 5]It is a schematic plan view of the planar structure of an annular inclined flow path according to an embodiment of the present application. [Figure 6] It is a schematic side cross-sectional perspective structure view of a straight-through shut-off valve according to an embodiment of the present application. [Figure 7] It is a schematic perspective structure view of a straight-through shut-off valve according to an embodiment of the present application. [Figure 8] It is a schematic view of the flow state of the medium when the straight-through shut-off valve according to an embodiment of the present application is open.

Description of Signs

[0017] The signs in the figure respectively indicate the following. 1... valve body, 2... valve neck, 3... valve cover, 4... valve shaft, 5... valve body sealing gasket, 6... valve body sealing gasket fixing ring, 7... valve flap, 8... chamber, 9... shut-off chamber, 10... annular inclined flow path, 11... branch path, 701... valve flap body, 702... male screw column, 703... cylinder, 704... female screw hole, 705... cylinder hole.

Modes for Carrying Out the Invention

[0018] Example 1: As shown in FIGS. 1, 3 and 4, in an embodiment of the present application, there is provided a valve opening and closing member including a valve flap 7, on one side of the valve flap 7, a valve body sealing gasket 5 and a valve body sealing gasket fixing ring 6 configured to fix the valve body sealing gasket 5 to the valve flap 7 are provided in sequence.

[0019] The valve flap 7 includes a valve flap body 701, a male screw column 702 is concentrically provided below the valve flap body 701, the valve body sealing gasket fixing ring 6 is provided with a female screw hole 704 screwed to the male screw column 702, and a sealing structure is provided on the side of the male screw column 702 away from the valve flap body 701. The sealing structure restricts the entry of the medium into the gap between the male screw column 702 and the female screw hole 704.

[0020] In this embodiment, the valve opening and closing member is specifically applied to a shut-off valve, for example, a straight-through shut-off valve, and the valve is opened or closed by the linear movement of the valve flap 7 inside the shut-off valve.

[0021] In the process flow of antibiotic production, the straight-through shut-off valve is one of the important components. And in actual application, according to the requirements of the antibiotic production process, it is necessary that the inside of the valve has low roughness, low dead angles, and no liquid accumulation. In this application, by screwing the male screw column 702 and the female screw hole 704 to fix the valve body sealing gasket fixing ring 6 to the valve flap main body 701, the valve body sealing gasket 5 is clamped and fixed between the valve flap main body 701 and the valve body sealing gasket fixing ring 6, and at the same time, by closing the end of the female screw hole 704 with the sealing structure, it is prevented that the medium flowing through the valve enters the gap between the female screw hole 704 and the male screw column 702.

[0022] The sealing structure is configured to limit the inflow of the medium into the gap at the connection point between the female screw hole 704 and the male screw column 702, thereby avoiding the generation of liquid accumulation in the male screw column 702 and the female screw hole 704, reducing the difficulty of sterilizing and cleaning the inside of the valve, and ensuring the hygienic and aseptic environment in the production process.

[0023] In this application, by connecting the male screw column 702 and the female screw hole 704 to fix the valve body sealing gasket fixing ring 6, the valve body sealing gasket 5 is abutted against the valve flap 7 to achieve the function of sealing and fixing. At the same time, in this application, the sealing structure restricts the inflow of the medium into the gap between the male screw column 702 and the female screw hole 704, avoids the generation of liquid accumulation inside the valve body 1, and ensures the hygienic and aseptic process in the production process.

[0024] <00001-03>In addition, since the valve body sealing gasket 5 and the valve body sealing gasket fixing ring 6 come into contact to form a seal, the flow of the medium circulating through the valve is restricted from entering the gap between the male threaded column 702 and the female threaded hole 704 from the side of the female threaded hole 704 that is closer to the valve body sealing gasket 5. This prevents liquid from accumulating on the metal parts that fix the valve body sealing gasket 5 in the valve, and ensures a hygienic and sterile environment for the antibiotic production process inside the valve.

[0025] In this embodiment, the valve body sealing gasket 5 is configured to be moved along with the valve flap body 701 to seal the passage through which the medium flows inside the valve, and the valve body sealing gasket fixing ring 6 is fixed to the valve flap body 701 so that the valve body sealing gasket 5 is sandwiched and fixed on both sides by the valve body sealing gasket fixing ring 6 and the valve flap body 701.

[0026] In this embodiment, the valve opening / closing material may also be applied to other mechanical members having a valve flap 7, thereby achieving obstruction and sealing to the flowing medium in these mechanical members, and thus avoiding erosion of the corresponding area inside the medium and the effects of the aseptic process due to liquid accumulation of the medium.

[0027] The sealing structure includes a cylindrical column 703, and the valve body sealing gasket fixing ring 6 is further provided with a cylindrical hole 705, which is located below the female screw hole 704. The cylindrical column 703 and the cylindrical hole 705 are tightly fitted together, preventing the connection between the valve body sealing gasket fixing ring 6 and the valve flap 7 from becoming loose.

[0028] Because the surfaces of the cylinder 703 and the cylindrical hole 705 are smooth, a mechanical sealing effect is achieved by the interlocking connection between the cylinder 703 and the cylindrical hole 705. This prevents the medium flowing through the valve from entering the gap between the male threaded column 702 and the female threaded hole 704, thus preventing the medium from flowing into the gap between the male threaded column 702 and the female threaded hole 704 and causing liquid accumulation. This reduces the difficulty of sterilization cleaning inside the valve and ensures a hygienic and sterile environment during the production process.

[0029] Furthermore, since the connection between the cylinder 703 and the cylindrical hole 705 is a tight fit, and the movement of the valve body sealing gasket fixing ring 6 is restricted, the loosening between the male threaded column 702 and the female threaded hole 704 is prevented.

[0030] In other words, the main technical features of this embodiment are that the sequential setting of the male threaded column 702 and the cylindrical column 703, and the interlocking connection between the cylindrical column 703 and the cylindrical hole 705 achieve mechanical sealing of the cylindrical hole 705, and the contact between the valve body sealing gasket 5 and the valve body sealing gasket fixing ring 6 achieves sealing of the other side of the female threaded hole 704. As a result, the flow of the medium that has passed through the valve into the gap between the male threaded column 702 and the female threaded hole 704 is restricted, the occurrence of liquid accumulation in the male threaded column 702 and the female threaded hole 704 is avoided, the difficulty of sterilization cleaning of the inside of the valve is reduced, and a hygienic and sterile environment is ensured in the production process.

[0031] In this embodiment, the male threaded column 702 and the cylindrical column 703 may be integrally molded, or they may be concentrically connected by welding or other means after separate molding, as long as it is ensured that the male threaded column 702 and the female threaded hole 704 can be screwed together and the cylindrical column 703 and the cylindrical hole 705 are tightly fitted together to achieve a mechanical sealing effect. Furthermore, the male threaded column 702 may also be integrally molded with the valve flap body 701, or they may be concentrically connected by welding or other means.

[0032] In one embodiment, the sealing structure may be an annular sealing ring provided at the end of the male screw column 702 and a similarly provided cylindrical hole 705. By providing an annular sealing ring at the end of the male screw column 702 and bringing it into sliding contact with the inner wall of the cylindrical hole 705, a sealing effect is achieved, preventing the medium from flowing into the gap between the female screw hole 704 and the male screw column 702. However, compared to the interference fit connection between the cylinder 703 and the cylindrical hole 705 in this embodiment, that technical embodiment lacks the effect of preventing loosening of the connection between the male screw column 702 and the female screw hole 704, whereas the two technical embodiments described above in this embodiment have a superior effect.

[0033] By integrally molding the cylindrical column 703 and the male threaded column 702, the entire production process becomes more convenient, and the overall structure becomes more stable.

[0034] On the other hand, by configuring the female screw hole 704 as a blind hole, sealing of one end of the female screw hole 704 is achieved, and the entry of the medium flowing inside the valve body 1 into the gap between the male screw column 702 and the female screw hole 704 is restricted, thereby preventing the formation of liquid accumulation inside the valve body 1 and ensuring a hygienic and sterile process during production.

[0035] When the female screw hole 704 is configured as a blind hole, one end of the female screw hole 704 facing the valve flap body 701 is in communication, and the other end of the female screw hole 704 away from the valve flap body 701 is closed. As a result, the medium flowing inside the valve cannot enter the female screw hole 704 from the end away from the valve flap body 701, creating a sealing effect on one end of the female screw hole 704, and further avoiding the problem of liquid accumulating in the gap at the connection point between the female screw hole 704 and the male screw column 702.

[0036] Furthermore, in order to ensure that the valve body sealing gasket 5 can be fixed to one side of the valve flap body 701 by the valve body sealing gasket fixing ring 6, the length of the male screw column 702 should be smaller than the depth of the female screw hole 704, thereby ensuring that the valve body sealing gasket fixing ring 6 and the valve flap body 701 each come into contact with the valve body sealing gasket 5.

[0037] Example 2: As shown in Figures 2, 5 to 8, the embodiment of the present invention provides a direct-type shut-off valve comprising a valve body 1, wherein the valve body 1 is provided with two chambers 8 that communicate with the outside, each of the two chambers 8 is provided with a branch passage 11, a shut-off cavity 9 is provided at the point where the two chambers 8 communicate, a valve port is provided at the point where the shut-off cavity 9 communicates with one of the chambers 8, a valve shaft 4 extending to the outside of the valve body 1 passes through and is slidably connected to the shut-off cavity 9, and one end of the valve shaft 4 located inside the valve body 1 is fixedly connected to a valve flap body 701.

[0038] In the actual process of antibiotic production, the external communication points of two chambers 8 and a valve body 1 are connected to an external pipeline, and the valve shaft 4 is connected to an actuator mechanism, the actuator mechanism including electric, air-operated, or manual types.

[0039] When it is necessary to open the passage inside the valve body 1, the actuator mechanism drives the valve stem 4 to move upward, and the valve flap 7, valve body sealing gasket 5, and valve body sealing gasket fixing ring 6 move in synchronously with the valve stem 4, causing the valve body sealing gasket 5 to detach from the valve port at the point where the shut-off cavity 9 and the chamber 8 communicate, thereby simultaneously connecting the shut-off cavity 9 to the two chambers 8, and at this time, the inside of the valve body 1 is in a state where the medium can flow.

[0040] When it becomes necessary to close the passage through which the medium flows inside the valve body 1, the actuator mechanism drives the valve stem 4 to move downward, causing the valve flap 7, valve body sealing gasket 5, and valve body sealing gasket fixing ring 6 to move in synchronously with the valve stem 4. The valve body sealing gasket 5 moves until it contacts the outer wall of the valve opening, forming a seal. This blocks the flow of the medium inside the valve body 1, thereby achieving flow interruption and cessation of the medium's flow inside the valve body 1.

[0041] In this invention, the valve flap 7 and the valve body sealing gasket 5 are moved together by the valve stem 4 so that they move up and down. As a result, the valve body sealing gasket 5 is moved apart from or pressed against the communication point between the chamber 8 and the shut-off cavity 9, thereby enabling opening and closing of the inside of the valve body 1.

[0042] By applying the valve flap 7 to this embodiment, the existence of blind spots inside the direct-type shut-off valve is reduced during actual application, the existence of liquid accumulation in the valve flap 7 inside the direct-type shut-off valve is avoided, and the difficulty of sterilizing and cleaning the direct-type shut-off valve is reduced.

[0043] Since direct-acting shut-off valves are also used in industries such as food, pharmaceuticals, and chemicals, the direct-acting shut-off valve described in this application may be applied to these industries, and the use of the direct-acting shut-off valve must satisfy specific usage requirements.

[0044] An annular inclined channel 10 is provided around the valve opening, and the annular inclined channel 10 is in communication with the shut-off chamber 9. Even when the valve flap body 701 closes or opens the valve opening, one chamber 8 is always maintained in communication with the shut-off chamber 9 and is in communication with the annular inclined channel 10. Within the two chambers 8, there are branched passages 11 configured to allow the medium to flow out of and into the chamber 8, respectively, and the inner bottom of the annular inclined channel 10 slopes to one side from higher to lower.

[0045] In the related technology, an annular passage is also provided inside the direct-type shut-off valve, and is similarly provided on the circumferential side of the valve opening. However, the inner bottom of the annular passage in the related technology is provided horizontally, meaning that after the valve body 1 is installed, the valve stem 4 is in a vertical position, and the inner bottom of the annular passage in the related technology is on a horizontal plane.

[0046] On the other hand, in the present invention, as shown in Figures 2 and 8, the shut-off chamber 9 is always in communication with the right-hand chamber 8 shown in the figure, the left-hand chamber 8 is not in communication with the shut-off chamber 9 when the valve opening is closed by the valve flap 7, and the annular inclined flow path 10 maintains constant communication with the right-hand chamber 8 shown in the figure.

[0047] In Figures 2 and 8, the direct-type shut-off valve in this application is shown in a closed state and an open state, respectively. As shown in Figure 8, when the valve opening is open in this application, the medium fills the inside of the valve body 1, flows through the two chambers 8 and the shut-off cavity 9, and passes through the valve body 1. At this time, the medium also fills the annular inclined flow path 10 located on the periphery of the valve opening.

[0048] As shown in Figure 2, when the valve opening in this invention is closed, the medium flows out from inside the valve body 1, but the medium located in the annular inclined channel 10 flows into the chamber 8 which is connected to the annular inclined channel 10, that is, into the right-hand chamber 8 in Figure 2, and because the bottom of the annular inclined channel 10 slopes to one side from the higher side to the lower side, the medium that enters the annular inclined channel 10 flows along the inner bottom of the annular inclined channel 10 due to the action of gravity, and the annular inclined channel 10 and right Through the communication point between the side chamber 8 right Entering the side chamber 8, and then, right The liquid is discharged through the branch passage 11 in the side chamber 8, thereby preventing the presence of liquid accumulation in the annular inclined channel 10, further reducing the possibility of liquid accumulation in the valve body 1, ensuring a hygienic and sterile environment inside the valve body 1 during the antibiotic production process, and allowing condensed water in the chamber 8 to also flow out of the chamber 8 through the branch passage 11.

[0049] Next, if it is necessary to sterilize the two chambers 8 and the isolation chamber 9, the medium required for sterilization, such as water vapor, may enter the chamber 8 through a location where the chamber 8 communicates with the outside, or it may enter the chamber 8 through the branch passage 11.

[0050] The external communication points between the two chambers 8 and the valve body 1 are connected to the external pipeline by welding.

[0051] In related technologies, the connection point between the outside of the valve body 1 and the chamber 8 of a direct-acting shut-off valve is generally made by a conventional flange and sealed with a flat sealing gasket. However, precise positioning of the flat sealing gasket is impossible, and the sealing surface of a conventional flange is rough, resulting in liquid accumulation between the flanges after connection. In contrast, the present invention connects to the external pipeline by welding, thereby eliminating the blind spots and sealing problems of the butt joint and avoiding the presence of liquid accumulation.

[0052] The external communication points between the two chambers 8 and the valve body 1 are further connected to the external pipeline by sanitary flanges, and the sanitary flanges, together with an O-type sealing ring via their uneven surfaces, seal the connection point between the valve body 1 and the external pipeline.

[0053] As can be seen from the above, in related technologies, the connection point between the outside of the valve body 1 and the chamber 8 of a direct-acting shut-off valve is generally made by a normal flange and sealed with a flat sealing gasket. However, precise positioning of the flat sealing gasket is impossible, and the sealing surface of the normal flange is also rough, so liquid accumulation exists between the flanges after connection. In contrast, by adopting a sanitary flange connection and sealing it together with an O-type sealing ring, the blind spots that occur after connection and the blind spots between sealing gaskets can be greatly reduced.

[0054] The valve body 1 is provided with an opening that communicates with the shut-off chamber 9, and the valve cover 3 is sealed and connected to the opening via a sealing gasket. The valve cover 3 is provided with a valve neck 2 that communicates with the inside of the shut-off chamber 9, and the valve stem 4 slides and is sealed and connected within the valve neck 2.

[0055] Since the opening in the valve body 1 is sealed by the valve cover 3 and the sealing gasket, the movement of the valve stem 4 is facilitated, leakage of the medium is avoided, and good sealing performance inside the valve body 1 is ensured.

[0056] The space between the valve stem 4 and the valve neck 2 is sealed with a composite filler material. This ensures good sealing during the up-and-down movement of the valve stem 4, preventing the medium from flowing out of the valve body 1 through the gap between the valve stem 4 and the valve neck 2.

Claims

1. A valve opening / closing member equipped with a valve flap (7), On one side of the valve flap (7), a valve body sealing gasket (5) and a valve body sealing gasket fixing ring (6) configured to fix the valve body sealing gasket (5) to the valve flap (7) are provided in that order. The valve flap (7) comprises a valve flap body (701), a male threaded column (702) concentrically provided below the valve flap body (701), a female threaded hole (704) screwed into the male threaded column (702) in the valve body sealing gasket fixing ring (6), a sealing structure provided on the side of the male threaded column (702) away from the valve flap body (701), and the sealing structure is configured to restrict the entry of a medium into the gap between the male threaded column (702) and the female threaded hole (704). The sealing structure comprises a cylinder (703), and below the female screw hole (704) is a cylindrical hole (705), and the cylinder (703) is fastened and fitted into the cylindrical hole (705). Valve opening and closing mechanism.

2. The cylinder (703) and the male screw column (702) are integrally molded. The valve opening / closing material according to claim 1.

3. A straight-through shut-off valve comprising a valve body (1) and including a valve opening / closing member according to claim 1 or 2, The valve body (1) is provided with two chambers (8) that communicate with the outside, and each of the two chambers (8) is provided with a branch passage (11). A shut-off cavity (9) is provided at the point where the two chambers (8) communicate, and a valve port is provided at the point where the shut-off cavity (9) communicates with one of the chambers (8). A valve shaft (4) that extends to the outside of the valve body (1) passes through and is slidably connected to the shut-off cavity (9), and one end of the valve shaft (4) located inside the valve body (1) is fixedly connected to the valve flap body (701). Direct-acting shut-off valve.

4. An annular inclined passage (10) is provided on the circumferential side of the valve opening, and the annular inclined passage (10) is in communication with a shut-off chamber (9). Even when the valve flap body (701) closes or opens the valve opening, one of the chambers (8) is always maintained in communication with the shut-off chamber (9) and is in communication with the annular inclined passage (10). Within the two chambers (8), there are branching passages (11) through which the medium flows out of and into the chambers (8), and the inner bottom of the annular inclined passage (10) slopes to one side from the higher side to the lower side. The direct-type shut-off valve according to claim 3.

5. The external communication points between the two chambers (8) and the valve body (1) are connected to the external pipeline by welding. The direct-type shut-off valve according to claim 3.

6. The external communication points between the two chambers (8) and the valve body (1) are connected to an external pipeline by sanitary flanges, and the sanitary flanges, together with an O-type sealing ring via their uneven surfaces, seal the connection points between the valve body (1) and the external pipeline. The direct-type shut-off valve according to claim 3.

7. The valve body (1) is provided with an opening that communicates with a shut-off cavity (9), and a valve cover (3) is sealed and connected to the opening via a sealing gasket. The valve cover (3) is provided with a valve neck (2) that communicates with the inside of the shut-off cavity (9), and the valve shaft (4) slides and is sealed and connected within the valve neck (2). The direct-type shut-off valve according to claim 3.

8. The space between the valve stem (4) and the valve neck (2) is sealed with a composite filler material. The direct-type shut-off valve according to claim 7.

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