CN216742841U

CN216742841U - Stop valve

Info

Publication number: CN216742841U
Application number: CN202122903696.7U
Authority: CN
Inventors: 寿杰; 周峰; 谭震宇; 楼峰
Original assignee: Zhejiang Dunan Artificial Environment Co Ltd
Current assignee: Zhejiang Dunan Artificial Environment Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-06-14
Anticipated expiration: 2031-11-23

Abstract

The present invention provides a shut-off valve comprising: the valve seat is provided with a first valve cavity, a valve port, a first interface and a second interface, the first interface and the second interface are positioned on the side wall of the valve seat, the first interface and the second interface are communicated with the first valve cavity, the valve port is arranged on the inner wall of the first valve cavity and positioned between the first interface and the second interface, and one end of the valve seat is provided with an annular step structure arranged around the first valve cavity; the valve pipe is of a tubular structure, one end of the valve pipe is connected with the annular step structure, the valve pipe is provided with a second valve cavity, and the second valve cavity is communicated with the first valve cavity; the valve core is movably arranged in the first valve cavity and the second valve cavity to open or close the valve ports; wherein, disk seat and valve pipe are stainless steel material. Through the technical scheme provided by the utility model, the problems of difficult processing and high cost of the stop valve in the prior art can be solved.

Description

Stop valve

Technical Field

The utility model relates to the technical field of valves, in particular to a stop valve.

Background

At present, the existing stop valve is generally composed of a valve body, a valve core and other structures, and the valve port is opened or closed by the up-and-down movement of the valve core in the valve body. In the prior art, the valve body and the valve core are usually made of brass, the cost of the brass is high, the valve body is of an integrated structure, the structure is complex, the valve body is difficult to process in practice, and the processing cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a stop valve, which aims to solve the problems of difficult processing and high cost of the stop valve in the prior art.

In order to solve the above problem, the present invention provides a shut valve comprising: the valve seat is provided with a first valve cavity, a valve port, a first interface and a second interface, the first interface and the second interface are positioned on the side wall of the valve seat, the first interface and the second interface are communicated with the first valve cavity, the valve port is arranged on the inner wall of the first valve cavity and positioned between the first interface and the second interface, and one end of the valve seat is provided with an annular step structure arranged around the first valve cavity; the valve pipe is of a tubular structure, one end of the valve pipe is connected with the annular step structure, the valve pipe is provided with a second valve cavity, and the second valve cavity is communicated with the first valve cavity; the valve core is movably arranged in the first valve cavity and the second valve cavity to open or close the valve ports; wherein, disk seat and valve pipe are stainless steel material.

Further, the valve core is made of stainless steel.

Further, the stop valve still includes: the limiting part is located in the second valve cavity, the outer wall of the limiting part is connected with the inner wall of the second valve cavity, one end of the limiting part is matched with one end, deviating from the valve port, of the valve core in a stop mode, and the limiting part is made of stainless steel materials.

Furthermore, the limiting part is of a tubular structure, an annular groove is formed in one end, facing the valve port, of the limiting part, the stop valve further comprises a first sealing gasket, the first sealing gasket is arranged at one end, facing the limiting part, of the valve core, the first sealing gasket is matched with the periphery of the annular groove in a stopping mode, the valve core is provided with an operation hole, and the opening of the operation hole faces the opening of the limiting part.

Furthermore, the side wall of the valve core is provided with a first annular groove and a second annular groove, the stop valve also comprises a sealing element and a second sealing gasket, the sealing element is positioned in the first annular groove and is in sealing fit with the inner wall of the second valve cavity, the second sealing gasket is positioned in the second annular groove and is in sealing fit with the inner wall of the first valve cavity; when the valve port is closed, the second sealing gasket is abutted with the periphery of the valve port.

Further, the valve core is provided with an external thread, the first valve cavity is provided with an internal thread, and the external thread is matched with the internal thread.

Furthermore, the first valve cavity comprises a first hole section and a second hole section which are communicated with each other, the diameter of the first hole section is larger than that of the second hole section, the internal thread is positioned on the inner wall of the first hole section, a valve port is formed at the position where the first hole section is communicated with the second hole section, the first interface is communicated with the first hole section, and the second interface is communicated with the second hole section.

Furthermore, the annular step structure is provided with an inner peripheral surface and a limiting surface, the inner peripheral surface is perpendicular to the limiting surface, the outer wall of the valve pipe is matched with the inner peripheral surface, and one end of the valve pipe is connected with the limiting surface.

Furthermore, the stop valve also comprises a first connecting pipe and a second connecting pipe, wherein the outer wall of the first connecting pipe is connected with the inner wall of the first connector, the first connecting pipe is communicated with the first connector, the outer wall of the second connecting pipe is connected with the inner wall of the second connector, and the second connecting pipe is communicated with the second connector; wherein, first takeover and second takeover are stainless steel.

Furthermore, the stop valve also comprises a third connecting pipe and a fourth connecting pipe, the third connecting pipe is sleeved at one end of the first connecting pipe far away from the first interface, and the fourth connecting pipe is sleeved at one end of the second connecting pipe far away from the second interface.

Furthermore, the stop valve also comprises a first valve cover, a second valve cover and a third valve cover, wherein the first valve cover covers one end of the valve pipe, the second valve cover covers one end of the third connecting pipe, and the third valve cover covers one end of the fourth connecting pipe.

Further, the lateral wall of disk seat has the blow vent, and the blow vent communicates with first valve pocket, and the stop valve still includes the valve structure, and valve structure and blow vent are connected.

By applying the technical scheme of the utility model, the utility model provides a stop valve, which comprises: the valve seat is provided with a first valve cavity, a valve port, a first interface and a second interface, the first interface and the second interface are positioned on the side wall of the valve seat, the first interface and the second interface are communicated with the first valve cavity, the valve port is arranged on the inner wall of the first valve cavity and positioned between the first interface and the second interface, and one end of the valve seat is provided with an annular step structure arranged around the first valve cavity; the valve pipe is of a tubular structure, one end of the valve pipe is connected with the annular step structure, the valve pipe is provided with a second valve cavity, and the second valve cavity is communicated with the first valve cavity; the valve core is movably arranged in the first valve cavity and the second valve cavity to open or close the valve ports; wherein, disk seat, valve pipe and case are stainless steel material. By adopting the scheme, the valve seat and the valve pipe are arranged, so that the valve body is arranged into a split structure, and the valve seat and the valve pipe are respectively processed and then connected to form an integral structure of the valve body, thereby reducing the processing difficulty of the valve body; the valve seat, the valve pipe and the valve core are made of stainless steel, so that the production cost is reduced. In the application, the valve core moves up and down in the first valve cavity and the second valve cavity, so that the first interface and the second interface can be communicated or disconnected, namely, the valve port is opened or closed; the annular step structure is arranged at one end of the valve seat, so that one end of the valve pipe is connected with the valve seat conveniently, the connection mode can adopt brazing, and the connection can be ensured to be more stable and reliable by using brazing.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 shows a cross-sectional view of a shut-off valve provided by an embodiment of the present invention;

FIG. 2 shows an exploded view of the shut-off valve of FIG. 1;

FIG. 3 shows a cross-sectional view of the shut-off valve of FIG. 1 in another position;

FIG. 4 shows a block diagram of the valve seat of FIG. 2;

FIG. 5 shows a cross-sectional view of the valve seat of FIG. 4;

FIG. 6 shows a cross-sectional view of the valve cartridge of FIG. 2;

FIG. 7 shows a block diagram of the limiter of FIG. 2;

fig. 8 shows a block diagram of the stopper in fig. 7 in another position.

Wherein the figures include the following reference numerals:

10. a valve seat; 11. a first valve chamber; 111. a first bore section; 112. a second bore section; 12. a valve port; 13. a first interface; 14. a second interface; 15. an annular step structure; 151. an inner peripheral surface; 152. a limiting surface;

20. a valve tube; 21. a second valve cavity;

30. a valve core; 31. an operation hole; 32. a first annular groove; 33. a second annular groove;

40. a limiting member; 41. an annular groove;

51. a first gasket; 52. a seal member; 53. a second gasket; 541. a first adapter tube; 542. a second adapter tube; 543. a third connection pipe; 544. a fourth connection pipe; 55. a first valve cover; 56. a second valve cover; 57. a third valve cover; 58. a vent; 59. a valve structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

As shown in fig. 1 to 8, an embodiment of the present invention provides a shutoff valve including: the valve seat 10 is provided with a first valve cavity 11, a valve port 12, a first interface 13 and a second interface 14, the first interface 13 and the second interface 14 are positioned on the side wall of the valve seat 10, the first interface 13 and the second interface 14 are both communicated with the first valve cavity 11, the valve port 12 is arranged on the inner wall of the first valve cavity 11, the valve port 12 is positioned between the first interface 13 and the second interface 14, and one end of the valve seat 10 is provided with an annular step structure 15 arranged around the first valve cavity 11; the valve tube 20 is of a tubular structure, one end of the valve tube 20 is connected with the annular step structure 15, the valve tube 20 is provided with a second valve cavity 21, and the second valve cavity 21 is communicated with the first valve cavity 11; a valve spool 30 movably disposed in the first valve chamber 11 and the second valve chamber 21 to open or close the valve port 12; wherein, the valve seat 10 and the valve tube 20 are made of stainless steel.

By adopting the scheme, the valve seat 10 and the valve pipe 20 are arranged, so that the valve body is arranged into a split structure, the valve seat 10 and the valve pipe 20 are respectively processed and then connected to form an integral structure of the valve body, and the processing difficulty of the valve body is reduced; the valve seat 10 and the valve tube 20 are made of stainless steel, so that the production cost is reduced. In the present application, by the valve core 30 moving up and down in the first valve chamber 11 and the second valve chamber 21, the connection or disconnection between the first port 13 and the second port 14 can be realized, that is, the valve port 12 is opened or closed; the annular step structure 15 is arranged at one end of the valve seat 10, so that one end of the valve tube 20 is conveniently connected with the annular step structure 15, the connection mode can adopt brazing, and the connection can be more stable and reliable by using brazing.

As shown in fig. 2, the bottom end of the valve seat 10 is a closed structure, wherein the valve seat 10 can be machined by a square rod, and the machining is facilitated and the material cost is reduced by machining the valve seat 10 by using the square rod. The valve tube 20 can be machined from existing stainless steel tubing, again to reduce cost.

Wherein, the valve core 30 is made of stainless steel. The valve core 30 is made of stainless steel, so that the production cost is reduced.

Specifically, the stop valve further comprises: the limiting member 40 is located in the second valve cavity 21, an outer wall of the limiting member 40 is connected to an inner wall of the second valve cavity 21, one end of the limiting member 40 is in stop fit with one end of the valve element 30 away from the valve port 12, and the limiting member 40 is made of stainless steel. The limiting member 40 is adapted to cooperate with an end of the valve element 30, and when the valve port 12 is opened, an end of the limiting member 40 can block an end of the valve element 30, so as to limit a moving range of the valve element 30, and further prevent the valve element 30 from being released from the first valve chamber 11 and the second valve chamber 21 during an upward movement. Wherein, the outer wall of the limiting member 40 is connected with the inner wall of the second valve chamber 21, and the connection mode can adopt brazing, so that the connection is more stable and reliable.

The limiting member 40 is a tubular structure, one end of the limiting member 40 facing the valve port 12 is provided with an annular groove 41, the stop valve further includes a first gasket 51, the first gasket 51 is disposed at one end of the valve core 30 facing the limiting member 40, the first gasket 51 is matched with a peripheral stop of the annular groove 41, the valve core 30 is provided with an operation hole 31, and an opening of the operation hole 31 faces an opening of the limiting member 40. By providing the annular groove 41 in the limiting member 40, when the valve port 12 is opened, one end of the valve element 30 moves toward the annular groove 41, and after moving a certain distance, the first seal gasket 51 abuts against the periphery of the annular groove 41, so that the limiting is realized, the sealing fit is realized, and the fluid leakage is prevented. Wherein, the operation hole 31 is a hexagonal structure, which is convenient for the user to operate.

Specifically, the side wall of the valve core 30 is provided with a first annular groove 32 and a second annular groove 33, the stop valve further comprises a sealing element 52 and a second sealing gasket 53, the sealing element 52 is positioned in the first annular groove 32, the sealing element 52 is in sealing fit with the inner wall of the second valve cavity 21, the second sealing gasket 53 is positioned in the second annular groove 33, and the second sealing gasket 53 is in sealing fit with the inner wall of the first valve cavity 11; when the valve port 12 is closed, the second gasket 53 abuts against the peripheral edge of the valve port 12.

As shown in fig. 1, the sealing element 52 abuts against the inner wall of the first annular groove 32, and the sealing element 52 is in sealing fit with the inner wall of the second valve chamber 21, so that the sealing performance of the valve core 30 and the valve pipe 20 is improved; the second sealing gasket 53 is abutted against the inner wall of the second annular groove 33, and the second sealing gasket 53 is in sealing fit with the inner wall of the first valve cavity 11, so that the sealing performance of the valve core 30 and the valve seat 10 is improved. The second annular groove 33 can be understood to be an annular step. In this scheme, when valve port 12 is closed, second sealed pad 53 can with the peripheral butt of valve port 12, has realized the soft seal between case 30 and valve port 12, has effectively reduced user's operation intensity.

Further, the valve core 30 has an external thread, and the first valve chamber 11 has an internal thread, and the external thread is matched with the internal thread. With the above arrangement, the valve body 30 can be moved in the first valve chamber 11, thereby opening or closing the valve port 12.

The first valve chamber 11 includes a first hole section 111 and a second hole section 112 which are communicated with each other, the diameter of the first hole section 111 is larger than that of the second hole section 112, the internal thread is located on the inner wall of the first hole section 111, the position where the first hole section 111 is communicated with the second hole section 112 forms the valve port 12, the first port 13 is communicated with the first hole section 111, and the second port 14 is communicated with the second hole section 112. The diameter of the first hole section 111 is set to be larger than that of the second hole section 112, the valve port 12 can be formed at the position where the first hole section and the second hole section are communicated, and the internal thread is arranged on the inner wall of the first hole section 111 and is used for being matched with the external thread of the valve core 30 to realize the up-and-down movement of the valve core 30; the first port 13 and the second port 14 communicate with the first hole section 111 and the second hole section 112, respectively, and enable fluid communication.

As shown in fig. 4, the annular step structure 15 has an inner circumferential surface 151 and a stopper surface 152, the inner circumferential surface 151 is perpendicular to the stopper surface 152, the outer wall of the valve tube 20 is engaged with the inner circumferential surface 151, and one end of the valve tube 20 is connected with the stopper surface 152. The inner circumferential surface 151 is arranged, so that the outer wall of the valve pipe 20 can be limited, and the valve pipe is convenient to mount; the limiting surface 152 can be connected with one end of the valve tube 20, the connection mode can adopt brazing, and the brazing connection is more stable and firm.

Specifically, the stop valve further includes a first connection pipe 541 and a second connection pipe 542, an outer wall of the first connection pipe 541 is connected with an inner wall of the first connector 13, the first connection pipe 541 is communicated with the first connector 13, an outer wall of the second connection pipe 542 is connected with an inner wall of the second connector 14, and the second connection pipe 542 is communicated with the second connector 14; wherein, the first connection pipe 541 and the second connection pipe 542 are made of stainless steel. By adopting the arrangement mode, the connection with the external connecting pipe is convenient; the first connecting pipe 541 and the second connecting pipe 542 are respectively connected with the first connector 13 and the second connector 14, and the connection mode can adopt brazing, so that the connection is stable and firm; the first connection pipe 541 and the second connection pipe 542 are respectively communicated with the first port 13 and the second port 14, and fluid can flow through them. Wherein, the first connection pipe 541 and the second connection pipe 542 are made of stainless steel, which reduces the material cost. In the present embodiment, the first adapter 541 and the second adapter 542 are disposed in parallel.

In this embodiment, the stop valve further includes a third connecting pipe 543 and a fourth connecting pipe 544, the third connecting pipe 543 is sleeved on one end of the first connecting pipe 541 far away from the first interface 13, and the fourth connecting pipe 544 is sleeved on one end of the second connecting pipe 542 far away from the second interface 14. The third connecting pipe 543 and the fourth connecting pipe 544 are respectively sleeved at one end of the first connecting pipe 541 and one end of the second connecting pipe 542, so that the connection with the external connecting pipe is facilitated, and the convenience of the stop valve is improved.

Further, the stop valve further includes a first valve cap 55, a second valve cap 56, and a third valve cap 57, the first valve cap 55 covers one end of the valve pipe 20, the second valve cap 56 covers one end of the third connection pipe 543, and the third valve cap 57 covers one end of the fourth connection pipe 544. The first valve cover 55 is arranged to cover one end of the valve pipe 20, so that the second valve cavity 21 is prevented from being interfered by the outside, and the safety and stability during working are ensured; the second valve cover 56 and the third valve cover 57 are respectively used for covering one end of the third connecting tube 543 and one end of the fourth connecting tube 544, so as to prevent the inner cavities of the third connecting tube 543 and the fourth connecting tube 544 from being interfered by the outside. The first valve cover 55, the second valve cover 56 and the third valve cover 57 can be made of stainless steel or plastic, so that the material cost is reduced.

Specifically, the side wall of the valve seat 10 is provided with a vent 58, the vent 58 is communicated with the first valve cavity 11, and the stop valve further comprises a valve structure 59, and the valve structure 59 is connected with the vent 58. Through setting up valve structure 59 and first valve chamber 11 intercommunication, can fill the gassing when needs to can maintain the leakproofness of atmospheric pressure in the stop valve, guarantee the stability of during operation.

Wherein, valve structure 59 includes: the valve comprises a tube body, a valve core and a tube cap, wherein one end of the tube body is connected with the air vent 58, the valve core is arranged in the tube body, and the tube cap is used for covering the other end of the tube body. Wherein, the one end and the vent 58 of body are connected, and the connected mode can adopt the brazing, and is stable, reliable.

Optionally, the side wall of the valve core 30 further has two relief grooves, two relief grooves are provided between the first annular groove 32 and the second annular groove 33, and two relief grooves are provided at intervals. When the valve core 30 is used for turning the external thread, the function of tool withdrawal can be achieved.

Optionally, the first port 13 has a first bore and a second bore, the first bore having a diameter greater than the second bore. Through the above arrangement, when the first interface 13 is connected with one end of the first connection pipe 541, the transition surface at the communication position of the first inner hole and the second inner hole can limit the one end of the first connection pipe 541, so as to limit the insertion depth of the first connection pipe 541. The second port 14 has a third bore and a fourth bore, the third bore having a diameter greater than the fourth bore. When the second connector 14 is connected with one end of the second connecting pipe 542, the transition surface at the communication position of the third inner hole and the fourth inner hole can limit the end of the second connecting pipe 542, so as to limit the insertion depth of the second connecting pipe 542.

Optionally, the vent has a fifth inner hole and a sixth inner hole, the diameter of the fifth inner hole is larger than that of the sixth inner hole, and when the vent 58 is connected with one end of the valve structure 59, the transition surface at the communication position of the fifth inner hole and the sixth inner hole can limit one end of the valve structure 59, so as to limit the insertion depth of the valve structure 59.

Optionally, the valve seat 10 further has two through holes, the two through holes are arranged in parallel, and the two through holes are located at the bottom of the valve seat 10. Through setting up two through-holes, be convenient for with external structure installation.

Optionally, the shut-off valve further comprises an annular rib disposed around the valve port 12, the annular rib having an outer diameter smaller than the inner diameter of the first bore section 111. Through setting up the protruding muscle of annular, can promote the sealed effect of valve port 12 better.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shut-off valve, comprising:

the valve seat (10) is provided with a first valve cavity (11), a valve port (12), a first interface (13) and a second interface (14), the first interface (13) and the second interface (14) are positioned on the side wall of the valve seat (10), the first interface (13) and the second interface (14) are communicated with the first valve cavity (11), the valve port (12) is arranged on the inner wall of the first valve cavity (11), the valve port (12) is positioned between the first interface (13) and the second interface (14), and one end of the valve seat (10) is provided with an annular step structure (15) arranged around the first valve cavity (11);

the valve pipe (20), the valve pipe (20) is of a tubular structure, one end of the valve pipe (20) is connected with the annular step structure (15), the valve pipe (20) is provided with a second valve cavity (21), and the second valve cavity (21) is communicated with the first valve cavity (11);

a valve core (30) movably arranged in the first valve cavity (11) and the second valve cavity (21) to open or close the valve port (12);

wherein, the valve seat (10) and the valve pipe (20) are both made of stainless steel.

2. The shut-off valve of claim 1, wherein the spool is stainless steel.

3. The shut-off valve of claim 1, further comprising:

the limiting piece (40) is located in the second valve cavity (21), the outer wall of the limiting piece (40) is connected with the inner wall of the second valve cavity (21), one end of the limiting piece (40) is matched with one end, away from the valve port (12), of the valve core (30) in a stop mode, and the limiting piece (40) is made of stainless steel.

4. A shut-off valve according to claim 3, characterised in that the retainer (40) is of tubular construction, that the end of the retainer (40) facing the valve port (12) has an annular groove (41), that the shut-off valve further comprises a first sealing gasket (51), that the first sealing gasket (51) is arranged at the end of the valve element (30) facing the retainer (40), that the first sealing gasket (51) cooperates with a peripheral stop of the annular groove (41), that the valve element (30) has an operating hole (31), and that the opening of the operating hole (31) faces the opening of the retainer (40).

5. The shut-off valve of claim 1, wherein the side wall of the spool (30) has a first annular groove (32) and a second annular groove (33), the shut-off valve further comprising a seal (52) and a second gasket (53), the seal (52) being located in the first annular groove (32), the seal (52) being in sealing engagement with the inner wall of the second valve chamber (21), the second gasket (53) being located in the second annular groove (33), the second gasket (53) being in sealing engagement with the inner wall of the first valve chamber (11); wherein, when the valve port (12) is closed, the second gasket (53) abuts against the periphery of the valve port (12).

6. A valve according to claim 1, characterized in that the spool (30) has an external thread and the first valve chamber (11) has an internal thread, the external thread cooperating with the internal thread.

7. The shut-off valve of claim 6, wherein the first valve chamber (11) comprises a first bore section (111) and a second bore section (112) which are in communication with each other, the first bore section (111) has a larger diameter than the second bore section (112), the internal thread is located on an inner wall of the first bore section (111), the position where the first bore section (111) and the second bore section (112) are in communication forms the valve port (12), the first port (13) is in communication with the first bore section (111), and the second port (14) is in communication with the second bore section (112).

8. The shut-off valve according to claim 1, wherein the annular step structure (15) has an inner peripheral surface (151) and a stopper surface (152), the inner peripheral surface (151) and the stopper surface (152) are perpendicular, an outer wall of the valve tube (20) is fitted to the inner peripheral surface (151), and one end of the valve tube (20) is connected to the stopper surface (152).

9. The shut-off valve according to claim 1, further comprising a first connection pipe (541) and a second connection pipe (542), wherein an outer wall of the first connection pipe (541) is connected with an inner wall of the first port (13), and the first connection pipe (541) is communicated with the first port (13), an outer wall of the second connection pipe (542) is connected with an inner wall of the second port (14), and the second connection pipe (542) is communicated with the second port (14); wherein the first connecting pipe (541) and the second connecting pipe (542) are both made of stainless steel.

10. The stop valve according to claim 9, characterized in that, the stop valve further comprises a third connecting pipe (543) and a fourth connecting pipe (544), the third connecting pipe (543) is sleeved on one end of the first connecting pipe (541) far away from the first interface (13), and the fourth connecting pipe (544) is sleeved on one end of the second connecting pipe (542) far away from the second interface (14).

11. The shut-off valve according to claim 10, further comprising a first valve cover (55), a second valve cover (56), and a third valve cover (57), the first valve cover (55) covering one end of the valve tube (20), the second valve cover (56) covering one end of the third connecting tube (543), and the third valve cover (57) covering one end of the fourth connecting tube (544).

12. The shut-off valve according to claim 1, characterized in that the side wall of the valve seat (10) has a vent opening (58), the vent opening (58) communicating with the first valve chamber (11), the shut-off valve further comprising a valve structure (59), the valve structure (59) being connected with the vent opening (58).