Stop valve

Abstract

The stop valve comprises a valve element, a valve rod, a valve body, a valve seat, a scraper and an inflation sealing ring, the valve element is provided with a valve element cooling cavity, the valve rod comprises a first valve rod body and a second valve rod body which are coaxially connected with the two ends of the valve element, the first valve rod body is provided with a first valve rod cooling cavity, and the second valve rod body is provided with a second valve rod cooling cavity. The first valve rod cooling cavity and the second valve rod cooling cavity are both communicated with the valve element cooling cavity, the valve element and the valve rod are rotatably arranged in the valve body, the valve body is provided with a valve body cooling cavity, the valve seat is connected with the valve body, the valve seat is provided with a valve seat cooling cavity, the scraper is connected with the valve seat and abuts against the valve element, and the inflation sealing ring is connected with the scraper and the valve seat. And when inflated and expanded, the valve rod abuts against the valve element. According to the stop valve, the valve rod, the valve element, the valve body and the valve seat are cooled through the cooling medium, and the sealing reliability can be improved in cooperation with the inflation sealing ring.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and more particularly to a cut-off valve. Background Art

[0002] Valves are a type of equipment that is widely used to cut off the flow of various materials. Valves used in high temperature and high pressure environments have more demanding operating environments and require targeted designs.

[0003] In the prior art, valves used in high temperature and high pressure environments all use metal hard seal ball valves. This type of ball valve is made of high temperature resistant metal materials, and the sealing ring and valve core need to be polished to mirror level at the sealing surface. Since this type of ball valve is made entirely of high temperature resistant metal materials, the cost is relatively high. Metal hard seals have poor ability to resist thermal deformation, and when thermal deformation occurs, problems such as valve leakage or jamming may occur.

[0004] Therefore, how to improve the sealing reliability of the cut-off valve when used in a high-temperature environment has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a cut-off valve to improve the sealing reliability when used in a high-temperature environment.

[0006] To achieve the above object, the present invention provides the following technical solutions: A cut-off valve, comprising: The valve core is provided with a valve core cooling cavity; The valve stem comprises a first valve stem and a second valve stem coaxially connected to both ends of the valve core, the first valve stem is provided with a first valve stem cooling cavity, the second valve stem is provided with a second valve stem cooling cavity, the first valve stem cooling cavity and the second valve stem cooling cavity are both connected to the valve core cooling cavity, the first valve stem cooling cavity is connected to a first cooling medium inlet, and the second valve stem cooling cavity is connected to a first cooling medium outlet; The valve body, the valve core and the valve stem are rotatably arranged in the valve body, the valve body is provided with a valve body cooling cavity, and the valve body is provided with a second cooling medium inlet and a second cooling medium outlet which are in communication with the valve body cooling cavity; A valve seat, the valve seat is connected to the valve body, a valve seat cooling cavity is provided on the valve seat, and a third cooling medium inlet and a third cooling medium outlet communicated with the valve seat cooling cavity are provided on the valve seat; A scraper, the scraper is connected to the valve seat and abuts against the valve core; An inflatable sealing ring is connected to the scraper and the valve seat respectively, and when the inflatable sealing ring is inflated and expanded, it abuts against the valve core.

[0007] Optionally, in the above-mentioned cut-off valve, a guide baffle is arranged in the valve core cooling cavity.

[0008] Optionally, in the above-mentioned cut-off valve, the guide baffle is arranged in a spiral shape.

[0009] Optionally, in the above-mentioned cut-off valve, the valve core cooling cavity is provided with a cavity inlet communicating with the first valve stem cooling cavity and a cavity outlet communicating with the second valve stem cooling cavity; When the medium flowing through the valve core flows in a vertical direction, the cavity inlet is located at the bottom of the valve core cooling cavity, and the cavity outlet is located at the top of the valve core cooling cavity.

[0010] Optionally, in the above-mentioned cut-off valve, the scraper is connected to the valve seat by clamping; The inflatable sealing ring is respectively connected with the valve seat and the scraper by clamping.

[0011] Optionally, in the above-mentioned cut-off valve, the valve seat is provided with a first groove and a second groove, the scraper is provided with a protrusion matching the first groove, the scraper is provided with a third groove, and the inflatable sealing ring is snap-fitted with the second groove and the third groove.

[0012] Optionally, the above-mentioned cut-off valve further includes a positioning ring, the positioning ring is connected to the valve seat, and the inflatable sealing ring is connected to the positioning ring.

[0013] Optionally, in the above-mentioned cut-off valve, the inflatable sealing ring is an inflatable rubber sealing ring, and the inflatable sealing ring is provided with an inflatable hole that can be connected to the inflatable component.

[0014] Optionally, in the above-mentioned cut-off valve, the scraper is made of metal and a cutting slit is provided on the scraper.

[0015] Optionally, in the above-mentioned cut-off valve, a purge hole is provided on the scraper, and an inert gas is introduced through the purge hole to purge the valve core.

[0016] It can be seen from the above scheme that the cut-off valve disclosed in the present invention, the scraper, the inflatable sealing ring and the valve seat cooperate to form a sealing structure, and the switching between the sealing and non-sealing states can be achieved by filling and exhausting gas into the inflatable sealing ring. When the cut-off valve is applied to high temperature and high pressure conditions, the valve stem, valve core, valve body and valve seat are cooled by a cooling medium, and the inflatable sealing ring is filled with gas to make it expand and abut against the valve core to achieve sealing. Through cooling and soft sealing, the possibility of sealing failure caused by heat deformation of the valve core, valve body and valve seat due to high temperature can be reduced, and the reliability of the seal can be improved. Compared with the metal hard sealing method used in the prior art, the requirements for the material of the cut-off valve are reduced, and the cost can be reduced; the scraper can scrape off the materials and dust bonded to the valve core, reduce the possibility of the inflatable sealing ring being stuck, and further improve the reliability of the seal; at the same time, the scraper and the inflatable sealing ring are connected to the valve seat. When the inflatable sealing ring needs to be repaired or replaced, it is only necessary to disassemble the valve seat without returning it to the factory for processing, which reduces the difficulty of repair and replacement and can reduce the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of a cut-off valve disclosed in an embodiment of the present invention; Figure 2 A cross-sectional view of a valve stem and a valve core of a cut-off valve disclosed in an embodiment of the present invention; Figure 3 A cross-sectional view of a cut-off valve core disclosed in an embodiment of the present invention; Figure 4 A cross-sectional view of a sealing structure disclosed in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a valve seat disclosed in an embodiment of the present invention; Figure 6 A cross-sectional view of a valve seat disclosed in an embodiment of the present invention; Figure 7 It is a schematic structural diagram of an inflatable sealing ring disclosed in an embodiment of the present invention; Figure 8 The structure of the scraper disclosed in the embodiment of the present invention is schematically shown in FIG. Figure 1 ; Fig. 9 The structure of the scraper disclosed in the embodiment of the present invention is schematically shown in FIG. Figure 2 .

[0019] Among them, 1 is a valve core, 11 is a valve core cooling cavity, 111 is a cavity inlet, 112 is a cavity outlet, and 12 is a guide baffle; 2 is a valve stem, 21 is a first valve stem, 211 is a first valve stem cooling chamber, 22 is a second valve stem, and 221 is a second valve stem cooling chamber; 3 is a valve body, 31 is a stuffing groove; 4 is a valve seat, 41 is a valve seat cooling cavity, 42 is a first groove, and 43 is a second groove; 5 is a scraper, 51 is a protrusion, 52 is a third groove, and 53 is a cutting slit; 6 is an inflatable sealing ring, 61 is a slot; 7 is a first cooling medium inlet; 8 is the first cooling medium outlet; 9 is a positioning ring; 10 is a driving device. DETAILED DESCRIPTION

[0020] In addition to the problems mentioned in the background technology, the prior art also has the following problems: when a valve fails, the entire valve needs to be returned to the factory for refurbishment of the valve core and the sealing ring, and the sealing surface needs to be re-grinded, which is time-consuming and labor-intensive.

[0021] The core of the present invention is to disclose a cut-off valve to improve the sealing reliability when used in a high-temperature environment.

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, an embodiment of the present invention discloses a cut-off valve, including a valve core 1, a valve stem 2, a valve body 3, a valve seat 4, a scraper 5 and an inflatable sealing ring 6.

[0024] The valve core 1 is provided with a valve core cooling cavity 11, the valve stem 2 is connected to the valve core 1, the valve stem 2 includes a first valve stem 21 and a second valve stem 22 coaxially connected to both ends of the valve core 1, the first valve stem 21 is provided with a first valve stem cooling cavity 211, the second valve stem 22 is provided with a second valve stem cooling cavity 221, the first valve stem cooling cavity 211 and the second valve stem cooling cavity 221 are both connected to the valve core cooling cavity 11, the first valve stem cooling cavity 211 is connected to the first cooling medium inlet 7, and the second valve stem cooling cavity 221 is connected to the first cooling medium outlet 8, as shown in FIG. Figure 2 The valve core 1 and the valve stem 2 are rotatably arranged in the valve body 3, so that the valve core 1 is driven to rotate by the rotation of the valve stem 2 to realize the opening and closing of the cut-off valve, so as to realize the circulation and cutting of the high-temperature medium.

[0025] The valve body 3 is provided with a valve body cooling cavity, and the valve body 3 is provided with a second cooling medium inlet and a second cooling medium outlet which are in communication with the valve body cooling cavity. The valve seat 4 is connected to the valve body 3, preferably in a detachable connection mode, and the valve seat 4 includes two valve seats 4, which are respectively located on both sides of the valve core 1 along the medium flow direction. Figure 1 Only one valve seat 4 is shown in the figure. The valve seat 4 is provided with a valve seat cooling cavity 41, a second cooling medium inlet and a second cooling medium outlet which are communicated with the valve seat cooling cavity 41.

[0026] The scraper 5 is connected to the valve seat 4 and abuts against the valve core 1. The shape of the abutting portion of the valve core 1 is an arc shape that matches the surface of the valve core 1, such as Figure 8 As shown, the material and dust adhering to the valve core 1 can be scraped off.

[0027] The inflatable sealing ring 6 is connected to the scraper 5 and the valve seat 4 respectively, as shown in FIG. Figure 3 As shown, the sealing effect can be achieved by filling and discharging gas into the inflatable sealing ring 6 to make the inflatable sealing ring 6 expand and contract. When the cut-off valve is closed, the inflatable sealing ring 6 is inflated and expanded, and abuts against the valve core 1. The inflatable sealing ring 6, the scraper 5 and the valve seat 4 cooperate to form a sealing structure to effectively cut off the high-temperature medium. When the cut-off valve is opened, the gas in the inflatable sealing ring 6 is discharged and is in a contracted state. At this time, the inflatable sealing ring 6 is not connected to the valve core 1. This solution can extend the service life of the inflatable sealing ring 6.

[0028] It should be noted that the valve body cooling cavity can be connected to the valve stem cooling cavity 21, or to the valve seat cooling cavity 41, and there can be multiple configuration schemes. Further, the valve core 1, the valve stem 2 and the valve seat 4 are preferably hollow structures, and of course the valve core cooling cavity 11 can also be formed by arranging a connecting plate circumferentially on the outer side of the valve core 1, and the valve body cooling cavity is preferably formed by arranging a jacket on the outer side of the valve body 3.

[0029] Cooling principle of the valve stem 2 and the valve core 1: the cooling medium enters the first valve stem cooling cavity 211 through the first cooling medium inlet 7, then flows into the valve core cooling cavity 11, and then flows into the second valve stem cooling cavity 221, and flows out from the first medium outlet 8, thereby cooling the valve stem 2 and the valve core 1.

[0030] Cooling principle of valve body 3: The cooling medium enters the valve body cooling cavity through the second cooling medium inlet, and flows out of the valve body cooling cavity through the second cooling medium outlet, so as to cool the valve body 3.

[0031] The cooling principle of the valve seat 4 is as follows: the cooling medium enters the valve seat cooling cavity 41 through the third cooling medium inlet and flows out from the third cooling medium outlet to cool the valve seat 4. The cooling medium is preferably cooling water.

[0032] In the cut-off valve disclosed in the embodiment of the present invention, the scraper 5, the inflatable sealing ring 6 and the valve seat 4 cooperate with each other and fit with the valve core 1 to form a sealing structure, and the switching between the sealing state and the non-sealing state can be achieved by filling and exhausting gas into the inflatable sealing ring 6. When the cut-off valve is applied to high temperature and high pressure working conditions, the valve stem 2, the valve core 1, the valve body 3 and the valve seat 4 are cooled by the cooling medium, and the inflatable sealing ring 6 is filled with gas to make it expand and abut against the valve core 1 to achieve sealing. Through cooling and soft sealing, the possibility of sealing failure caused by heat deformation of the valve core 1, valve body 3 and valve seat 4 due to high temperature can be reduced, the reliability of the seal can be improved, and compared with the metal hard sealing method used in the prior art, the requirements for the material of the cut-off valve are reduced, and the cost can be reduced; the scraper 5 can scrape off the materials and dust adhered to the valve core 1, reduce the possibility of jamming the inflation sealing ring 6, and further improve the reliability of the seal; at the same time, the scraper 5 and the inflation sealing ring 6 are both connected to the valve seat 4. When the inflation sealing ring 6 needs to be repaired or replaced, it is only necessary to disassemble the valve seat 4 without returning it to the factory for processing, which reduces the difficulty of repair and replacement and can reduce the cost of use.

[0033] Furthermore, the second valve stem 21 and the second valve stem 22 are connected to the valve core 1, specifically, they can be connected by thread, by flat key, by flange, or by welding, and the specific connection method is not limited. The first end of the first valve stem 21 is connected to the drive device 10, and the drive device 10 is used to drive the first valve stem 21 to rotate, thereby driving the valve core 1 to rotate to switch between the open and closed states. Specifically, the drive device 10 can be a manual drive device, such as a handle, a gear box, etc.; it can also be a pneumatic drive device, an electric drive device, or a hydraulic drive device.

[0034] In order to accelerate heat dissipation, a metal patch, such as a copper iron patch, may be provided on any one of the valve seat cooling cavity 41 , the valve body cooling cavity, and the valve core cooling cavity 11 .

[0035] Furthermore, in order to guide the cooling medium entering the valve core cooling cavity 11 and support the valve core 1, a guide baffle 12 is provided in the valve core cooling cavity 11. Figure 2-Figure 3 In some specific embodiments, the guide baffle 12 may include a plurality of baffles 12 arranged at intervals along the circumference of the valve core 1 to divide the valve core cooling cavity 11 into a plurality of valve core cooling channels, and the valve stem cooling cavity 21 is respectively connected to each valve core cooling channel, which can be achieved by providing a cooling groove connected to the valve stem cooling cavity 21, and the cooling groove is connected to each valve core cooling channel.

[0036] like Figure 3As shown, in other specific embodiments, the guide baffle 12 is arranged in a spiral shape. The valve core cooling cavity 11 is provided with a cavity inlet 111 and a cavity outlet 112 which are connected to the valve stem cooling cavity 21. The cooling medium flows into the valve core cooling cavity 11 through the cavity inlet 111 and flows out of the valve core cooling cavity 11 through the cavity outlet 112. When the flow direction of the medium flowing through the valve core 1 is vertical, the cavity inlet 111 is located at the bottom of the valve core cooling cavity 11, and the cavity outlet 112 is located at the top of the valve core cooling cavity 11. The two are arranged oppositely, and the cooling medium enters the bottom of the valve core cooling cavity 11 through the first valve stem cooling cavity 211, and then enters the top of the valve core cooling cavity 11 along the guide baffle until the entire valve core cooling cavity 11 is filled, and flows out from the cavity outlet 112 at the top to the valve stem cooling cavity 21. This arrangement allows the cooling medium to flow along the inner wall of the valve core 1 , reducing the generation of cooling dead zones and making the valve core 1 cooled more evenly. Meanwhile, the arrangement of the guide baffle 12 can reduce the deformation of the valve core 1 and enhance the strength of the valve core 1 .

[0037] It should be noted that the guide baffle 12 can be integrally formed with the valve core 1 or connected to the valve core 1 by welding. In order to ensure the uniformity of cooling of the valve seat cooling cavity 41 , a corresponding guide baffle 12 can also be arranged in the valve seat cooling cavity 41 .

[0038] Further, in some specific embodiments, the scraper 5 is connected to the valve seat 4 by clamping, and the inflatable sealing ring 6 is connected to the valve seat 4 and the scraper 5 by clamping. Specifically, one of the scraper 5 and the valve seat 4 is provided with a first clamping groove, and the other is provided with a first clamping portion matched with the first clamping groove. One of the inflatable sealing ring 6 and the valve seat 4 is provided with a second clamping groove, and the other is provided with a second clamping portion matched with the second clamping groove, and one of the inflatable sealing ring 6 and the scraper 5 is provided with a third clamping groove, and the other is provided with a third clamping portion matched with the third clamping groove.

[0039] In order to ensure the firmness of the connection between the scraper 5 and the valve seat 4, the scraper 5 and the valve seat 4 are also connected by a connecting piece. The scraper 5 and the valve seat 4 are respectively provided with corresponding mounting holes. The connecting piece can be bolts and nuts. Figure 5 The valve seat 4 is provided with mounting holes arranged along the circumferential direction.

[0040] like Figure 5-Figure 9 As shown, in some specific embodiments, the valve seat 4 is a stepped annular structure, and a first groove 42 and a second groove 43 are provided on the valve seat 4. The first groove 42 and the second groove 43 are both annular grooves. The scraper 5 is a stepped annular structure, and the scraper 5 is provided with a protrusion 51 that matches the first groove 42. Specifically, the protrusion 51 is annular, and the scraper 5 is provided with a third groove 52. The inflatable sealing ring 6 is a stepped annular structure, and the inflatable sealing ring 6 is engaged with the second groove 43 and the third groove 52. Specifically, Figure 4 As shown, the three cooperate to form a sealing structure, which fits with the valve core 1.

[0041] In order to position the inflatable sealing ring 6 and ensure the accuracy and speed of installation, the cut-off valve also includes a positioning ring 9. Specifically, the positioning ring 9 is connected to the valve seat 4, and can be connected by welding or by snapping. The inflatable sealing ring 6 is connected to the positioning ring 9, and preferably by snapping. The inflatable sealing ring 6 is provided with a slot 61 that can snap into the positioning ring 9.

[0042] Preferably, the inflatable sealing ring 6 is an inflatable rubber sealing ring, and an inflatable hole that can be connected to the inflatable component is provided on the inflatable sealing ring 6. The inflatable component specifically includes an inflatable pump and an inflatable tube, the inflatable pump provides power for inflating, and the inflatable tube is connected to the inflatable hole on the inflatable sealing ring 6. The inflatable pump can be arranged in the installation cavity by arranging an installation cavity outside the valve body 3.

[0043] The scraper 5 is preferably made of metal. In order to make the scraper 5 flexible, a cutting slit 53 is provided on the scraper 5. Figure 4 shown.

[0044] In order to further improve the reliability of the seal, a purge hole is opened on the scraper 5, and the scraper 5 is connected to the purge pipe. An inert gas (preferably nitrogen) can be introduced through the purge pipe to purge and cool the surface of the valve core 1 and the inflatable sealing ring 6, thereby reducing the impact of materials and dust on the surface of the valve core 1 on the sealing performance.

[0045] Furthermore, a packing groove 31 is provided in the middle and upper part of the valve body 3 , and the packing groove 31 is filled with packing to seal the first valve stem 21 and the valve body 3 to form a sealing layer to prevent leakage of high-temperature medium.

[0046] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0047] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0048] The terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cut-off valve, characterized in that: include: A valve core (1), wherein the valve core (1) is provided with a valve core cooling chamber (11); A valve stem (2), the valve stem (2) comprising a first valve stem (21) and a second valve stem (22) coaxially connected to the valve core (1) at two ends, the first valve stem (21) being provided with a first valve stem cooling cavity (211), the second valve stem (22) being provided with a second valve stem cooling cavity (221), the first valve stem cooling cavity (211) and the second valve stem cooling cavity (221) both being in communication with the valve core cooling cavity (11), the first valve stem cooling cavity (211) being in communication with a first cooling medium inlet (7), and the second valve stem cooling cavity (221) being in communication with a first cooling medium outlet (8); A valve body (3), the valve core (1) and the valve stem (2) being rotatably arranged in the valve body (3), the valve body (3) being provided with a valve body cooling cavity, and the valve body (3) being provided with a second cooling medium inlet and a second cooling medium outlet communicating with the valve body cooling cavity; a valve seat (4), the valve seat (4) being connected to the valve body (3), the valve seat (4) being provided with a valve seat cooling cavity (41), and the valve seat (4) being provided with a third cooling medium inlet and a third cooling medium outlet which are in communication with the valve seat cooling cavity (41); a scraper (5), the scraper (5) being connected to the valve seat (4) and abutting against the valve core (1); An inflatable sealing ring (6), wherein the inflatable sealing ring (6) is respectively connected to the scraper (5) and the valve seat (4); when the inflatable sealing ring (6) is inflated and expanded, it abuts against the valve core (1).

2. The shut-off valve according to claim 1, characterized in that A flow guide baffle (12) is provided in the valve core cooling cavity (11).

3. The shut-off valve according to claim 2, characterized in that The guide baffles (12) are arranged in a spiral shape.

4. The shut-off valve according to claim 3, characterized in that The valve core cooling cavity (11) is provided with a cavity inlet communicating with the first valve stem cooling cavity (211) and a cavity outlet communicating with the second valve stem cooling cavity (221); When the medium flowing through the valve core (1) flows in a vertical direction, the cavity inlet is located at the bottom of the valve core cooling cavity (11), and the cavity outlet is located at the top of the valve core cooling cavity (11).

5. The shut-off valve according to claim 1, characterized in that The scraper (5) is connected to the valve seat (4) by snap-fitting; The inflatable sealing ring (6) is respectively connected to the valve seat (4) and the scraper (5) by clamping.

6. The shut-off valve according to claim 5, characterized in that The valve seat (4) is provided with a first groove (42) and a second groove (43), the scraper (5) is provided with a protrusion (51) matching the first groove (42), the scraper (5) is provided with a third groove (52), and the inflatable sealing ring (6) is snap-fitted with the second groove (43) and the third groove (52).

7. The shut-off valve according to claim 6, characterized in that It also comprises a positioning ring (9), the positioning ring (9) being connected to the valve seat (4), and the inflatable sealing ring (6) being connected to the positioning ring (9).

8. The cut-off valve according to any one of claims 1 to 7, characterized in that: The inflatable sealing ring (6) is an inflatable rubber sealing ring, and an inflatable hole capable of communicating with an inflatable component is provided on the inflatable sealing ring (6).

9. The shut-off valve according to claim 1, characterized in that The scraper (5) is made of metal and is provided with a cutting slit (53).

10. The shut-off valve according to claim 9, characterized in that The scraper (5) is provided with a purge hole, through which an inert gas is introduced to purge the valve core (1).

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