CN218085493U

CN218085493U - Emergency valve

Info

Publication number: CN218085493U
Application number: CN202221147430.2U
Authority: CN
Inventors: 徐毅; 刘严超; 牛国新
Original assignee: CRRC Qiqihar Rolling Stock Co Ltd
Current assignee: CRRC Qiqihar Rolling Stock Co Ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-12-20
Anticipated expiration: 2032-05-13

Abstract

The utility model provides an emergency valve, emergency valve includes: the main valve is provided with a pilot valve air inlet channel, the pilot valve air inlet channel comprises an air inlet channel, a flow guide channel and an air outlet channel which are sequentially communicated, the air inlet channel and the air outlet channel both extend along the transverse direction, and the flow guide channel extends along the vertical direction; the pilot valve is connected with the main valve and is provided with a pilot valve cavity, and the air outlet of the air outlet channel is communicated with the air inlet of the pilot valve cavity; the dust filtering plug is arranged in the air outlet channel, or the air inlet of the dust filtering plug is communicated with the air outlet of the air outlet channel. Through the technical scheme that this application provided, can solve dust or impurity among the correlation technique and get into the emergency valve after, strain the problem that the dirt shrinked and blocks up easily.

Description

Emergency valve

Technical Field

The utility model relates to a railway freight car technical field particularly, relates to an emergency valve.

Background

And the air control valve, the auxiliary air cylinder, the accelerated release air cylinder, the brake cylinder and the like form a pipeline of a single-vehicle and freight-car braking system, wherein the air control valve is a core control component of the vehicle braking system and is used for controlling the vehicle braking system to generate braking, releasing and the like. The train pipe is filled with pressure air, the air control valve generates a relieving effect, the train pipe exhausts the pressure air, and the air control valve generates a braking effect. The air control valve consists of a main valve, a semi-automatic release valve, an emergency valve and an intermediate body. The emergency valve works under the working condition of emergency braking and has the function of quickly exhausting pressure air in a train pipe during emergency braking, so that the emergency braking reaction speed is increased, and a train can quickly obtain larger braking force to stop under the working condition of emergency braking.

In the related art, the emergency valve includes an emergency piston, a blow-off valve and a pilot valve, gas entering the emergency valve inflates a valve cavity of the pilot valve through a pilot valve channel, and a dust filtering plug is arranged on the pilot valve channel.

However, in the related art, after dust or impurities enter the emergency valve, the dust or impurities are easily deposited on the dust filter plug, and further the vent hole of the dust filter plug is blocked, so that the pilot valve cannot be charged.

SUMMERY OF THE UTILITY MODEL

The utility model provides an emergency valve to after dust or impurity among the solution correlation technique got into emergency valve, strain the problem that the dirt shrank up the easy jam.

The utility model provides an emergency valve, emergency valve includes: the main valve is provided with a pilot valve air inlet passage, the pilot valve air inlet passage comprises an air inlet passage, a flow guide passage and an air outlet passage which are communicated in sequence, the air inlet passage and the air outlet passage both extend along the transverse direction, and the flow guide passage extends along the vertical direction; the pilot valve is connected with the main valve and is provided with a pilot valve cavity, and the air outlet of the air outlet channel is communicated with the air inlet of the pilot valve cavity; the dust filtering plug is arranged in the air outlet channel, or the air inlet of the dust filtering plug is communicated with the air outlet of the air outlet channel.

Furthermore, the interface of the air inlet channel and the flow guide channel is a first interface, the interface of the flow guide channel and the air outlet channel is a second interface, the first interface is positioned above the second interface, and the second interface is positioned in the middle of the flow guide channel.

Furthermore, the dust filter plug is arranged in the air outlet channel and connected with the channel wall of the air outlet channel, and the dust filter plug is provided with a dust filter channel extending along the transverse direction.

Furtherly, the main valve is connected with the diapire of valve body including the valve body and the valve gap that are connected, the pilot valve, and inlet channel's air inlet is located the first side of valve body, and the valve gap setting is in the second side relative with the first side of valve body, and diversion channel is including setting up in the intercommunicating pore of valve gap, and the intercommunicating pore all has enclosed construction along the both ends of vertical extension and intercommunicating pore, and inlet channel and outlet channel all are linked together with the lateral wall of intercommunicating pore.

Further, the air inlet channel comprises a first channel and a second channel, the first channel is transversely arranged on the valve body, the second channel is transversely arranged on the valve cover, an air inlet of the second channel is arranged on the side wall of the valve cover and communicated with an air outlet of the first channel, and an air outlet of the second channel is communicated with the side wall of the communication hole.

Furthermore, the air outlet channel comprises a third channel and a fourth channel, the third channel is transversely arranged on the valve cover, the fourth channel is transversely arranged on the valve body, an air inlet of the third channel is communicated with the side wall of the communicating hole, an air outlet of the third channel is arranged on the side wall of the valve cover and communicated with an air inlet of the fourth channel, and an air outlet of the fourth channel is communicated with the pilot valve cavity.

Further, the closing structure includes a blocking piece inserted at a lower end of the communication hole and connected with the communication hole.

Further, emergency valve still includes first sealing washer and the second sealing washer of pressing from both sides and establishing between valve body and valve gap, and first sealing washer encloses the periphery of establishing at inlet channel, and the second sealing washer encloses the periphery of establishing at outlet channel.

Furthermore, the pilot valve inlet channel also comprises a transition channel, one end of the transition channel is communicated with the air outlet of the air outlet channel, and the other end of the transition channel is communicated with the air inlet of the pilot valve cavity.

Furthermore, the main valve further comprises an emergency piston and a blow-off valve, the valve body is provided with a main valve cavity, a partition plate is arranged in the valve body and divides the main valve cavity into an upper cavity and a lower cavity, the first channel is arranged in the upper cavity, the emergency piston is arranged in the upper cavity, and the blow-off valve is arranged in the lower cavity.

Use the technical scheme of the utility model, the emergency valve includes the main valve, the pilot valve and strain the dirt and contract stifled, after air admission emergency valve, the air gets into the main valve earlier, and loop through the inlet channel of horizontal extension, vertical extension's diversion channel and horizontal extension's outlet channel, and get into the air inlet of guide's valve pocket from outlet channel's gas outlet, and then get into in the pilot valve, because it contracts stifled setting or will strain the dirt and contract stifled air inlet and outlet channel's gas outlet and be linked together in outlet channel to strain the dirt, the air is through inlet channel, behind diversion channel and outlet channel's tortuous passageway, it contracts dust or the impurity reduction in the stifled air of dirt of entering, or, because it contracts stifled setting in the inlet channel of horizontal extension to strain the dirt, make dust or impurity can not contract stifled because of gravity factor siltation at the dirt of straining, thereby can not block up the stifled air vent of dirt contraction, and then can aerify for guide's valve pocket.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a cross-sectional view of an emergency valve provided by an embodiment of the present invention;

fig. 2 shows a cross-sectional view of a valve body of an emergency valve provided by an embodiment of the present invention;

fig. 3 shows a cross-sectional view of a valve cover of an emergency valve provided by an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a main valve; 11. a pilot valve inlet passage; 111. an air intake passage; 1111. a first channel; 1112. a second channel; 112. a flow guide channel; 113. an air outlet channel; 1131. a third channel; 1132. a fourth channel; 114. a first interface; 115. a second interface; 116. a transition passage; 12. a valve body; 121. a main valve chamber; 1211. an upper cavity; 1212. a lower cavity; 122. a partition plate; 13. a valve cover; 131. a communicating hole; 132. a closed structure; 1321. a blocking member; 14. an emergency piston; 15. a blow-off valve;

20. a pilot valve; 21. a pilot valve cavity;

30. filtering dust and blocking;

41. a first seal ring; 42. and a second seal ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 3, the embodiment of the utility model provides an emergency valve, emergency valve includes main valve 10, pilot valve 20 and the dirt that strains contracts stifled 30, main valve 10 has pilot valve inlet channel 11, pilot valve inlet channel 11 is including the inlet channel 111 that communicates in proper order, water conservancy diversion passageway 112 and outlet channel 113, inlet channel 111 and outlet channel 113 all follow horizontal extension, water conservancy diversion passageway 112 is along vertical extension, pilot valve 20 is connected with main valve 10, pilot valve 20 has pilot valve chamber 21, outlet channel 113's the gas outlet is linked together with the air inlet of pilot valve chamber 21, the dirt that strains contracts stifled 30 and sets up in outlet channel 113, or the dirt that strains contracts the air inlet of stifled 30 and is linked together with outlet channel 113's gas outlet.

Use the technical scheme of the utility model, the emergency valve includes main valve 10, pilot valve 20 and the dirt of straining contracts stifled 30, after the air gets into emergency valve, the air gets into main valve 10 earlier, and loop through the inlet channel 111 of horizontal extension, vertical extension's water conservancy diversion passageway 112 and horizontal extension's outlet channel 113, and get into the air inlet of pilot valve chamber 21 from outlet channel 113's gas outlet, and then get into in the pilot valve 20, because it contracts stifled 30 to strain the dirt and sets up in outlet channel 113 or will strain the dirt and contract the air inlet of stifled 30 and be linked together with outlet channel 113's gas outlet, the air is through inlet channel 111, behind the tortuous passageway of water conservancy diversion passageway 112 and outlet channel 113, get into and strain the dirt and contract dust or the impurity reduction in the air of stifled 30, or, because the dirt contracts stifled 30 setting in the inlet channel 111 of horizontal extension, make dust or impurity can not because of gravity factor siltation on straining dirt and contract stifled 30, thereby can not block up the air vent that strains dirt and contract stifled 30, and then can inflate for pilot valve chamber 21.

It should be noted that, the air inlet channel 111 and the air outlet channel 113 both extend along the transverse direction, and the flow guide channel 112 extends along the vertical direction, which means that the air inlet channel 111 and the air outlet channel 113 may extend along the horizontal direction, or may extend at a certain angle with the horizontal direction, for example, 0 to 5 °, and the flow guide channel may extend along the vertical direction, or may extend at a certain angle with the vertical direction, for example, 0 to 5 °.

In the present embodiment, the components in the main valve 10 may be supported by the air pressure in the pilot valve 20.

As shown in fig. 1 to fig. 3, an interface between the air inlet channel 111 and the flow guide channel 112 is a first interface 114, an interface between the flow guide channel 112 and the air outlet channel 113 is a second interface 115, the first interface 114 is located above the second interface 115, and the second interface 115 is located in the middle of the flow guide channel 112. By adopting the structure, the dust or impurities can be deposited at the bottom of the flow guide channel 112 by utilizing the vertical arrangement mode of the flow guide channel 112, so that the dust or impurities can not enter the air outlet channel 113, and the possibility of blocking the dust filtering shrinkage plug 30 is further reduced.

It should be noted that the first interface 114 is located above the second interface 115, and the second interface 115 is located in the middle of the flow guide channel 112, which means that the air inlet channel 111 and the air outlet channel 113 are both communicated with the side wall of the flow guide channel 112, the first interface 114 is spaced from the top end of the flow guide channel, and the second interface 115 is spaced from the bottom end of the flow guide channel.

As shown in fig. 1, dust collecting plug 30 is disposed in outlet passage 113 and connected to the wall of outlet passage 113, and dust collecting plug 30 has a dust collecting passage extending in the transverse direction. By adopting the structure, the transverse arrangement of the air outlet channel 113 is utilized, so that the dust filtering channel of the dust filtering shrinkage plug also extends transversely, dust or impurities can not be deposited on the dust filtering shrinkage plug 30 due to gravity factors, and the inflation of the pilot valve cavity 21 can not be influenced.

In this embodiment, the dust plug 30 has external threads, the wall of the outlet channel 113 has internal threads, and the dust plug 30 is connected to the outlet channel 113 by threads, which is advantageous for easy installation.

As shown in fig. 1, the main valve 10 includes a valve body 12 and a valve cover 13 connected to each other, the pilot valve 20 is connected to a bottom wall of the valve body 12, an air inlet of the air inlet passage 111 is located on a first side of the valve body 12, the valve cover 13 is disposed on a second side opposite to the first side of the valve body 12, the guide passage 112 includes a communication hole 131 disposed on the valve cover 13, the communication hole 131 extends vertically, both ends of the communication hole 131 have a closed structure 132, and the air inlet passage 111 and the air outlet passage 113 are both communicated with a side wall of the communication hole 131. The main valve 10, which is formed by connecting the valve body 12 and the valve cover 13, has the advantage of easy manufacture and installation.

In the present embodiment, the valve body 12 has the top wall, the side wall, and the bottom wall, and the first side and the second side of the valve body 12 are provided on the corresponding side walls, with the above-described structure, it is possible to make the intake passage 111 utilize the lateral direction of the valve body 12 as large as possible, so that dust or impurities as little as possible enter the downstream of the intake passage 111.

As shown in fig. 1 to 3, the air intake passage 111 includes a first passage 1111 and a second passage 1112, the first passage 1111 is disposed in the valve body 12 in the transverse direction, the second passage 1112 is disposed in the valve cover 13 in the transverse direction, an air intake port of the second passage 1112 is disposed in a side wall of the valve cover 13 and communicates with an air outlet port of the first passage 1111, and an air outlet port of the second passage 1112 communicates with a side wall of the communication hole 131. By providing the air intake passage 111 as the first passage 1111 and the second passage 1112 that communicate with each other, it is possible to prevent air from directly entering the communication hole 131 from the air outlet of the first passage 1111, and thus to prevent air leakage of the emergency valve due to the adaptability of the mouthpiece.

In the present embodiment, the intake port of the intake passage 111 is the intake port of the valve body 12.

As shown in fig. 1 to 3, the air outlet channel 113 includes a third channel 1131 and a fourth channel 1132, the third channel 1131 is transversely disposed on the valve cover 13, the fourth channel 1132 is transversely disposed on the valve body 12, an air inlet of the third channel 1131 is communicated with a side wall of the communication hole 131, an air outlet of the third channel 1131 is disposed on a side wall of the valve cover 13 and is communicated with an air inlet of the fourth channel 1132, and an air outlet of the fourth channel 1132 is communicated with the pilot valve chamber 21. By providing the air outlet channel 113 as the third channel 1131 and the fourth channel 1132 which are communicated with each other, air can be prevented from directly entering the communication hole 131 from the air outlet of the third channel 1131, and thus air leakage of the emergency valve due to the adaptability of the interface can be avoided.

In this embodiment, the pilot valve inlet channel 11 further includes a transition channel 116, one end of the transition channel 116 is communicated with the outlet of the outlet channel 113, and the other end of the transition channel 116 is communicated with the inlet of the pilot valve cavity 21.

As shown in fig. 1 and 3, the closing structure 132 includes a blocking piece 1321, and the blocking piece 1321 is inserted into a lower end of the communication hole 131 and connected to the communication hole 131. The communication hole can be closed by using the blocking member 1321, and the flow guide passage 112 can be cleaned by removing the blocking member 1321.

In the present embodiment, the blocking member 1321 includes a plug, and the lower end of the communication hole 131 is provided with an internal thread. The plug is connected with the communicating hole 131 through screw thread.

As shown in fig. 1, the emergency valve further includes a first sealing ring 41 and a second sealing ring 42 interposed between the valve body 12 and the valve cover 13, the first sealing ring 41 being disposed around the outer periphery of the inlet passage 111, and the second sealing ring 42 being disposed around the outer periphery of the outlet passage 113. The first sealing ring 41 can seal the air inlet passage 111, so as to eliminate air leakage of the air inlet passage 111 between the valve body 12 and the valve cover 13, and the second sealing ring 42 can seal the air outlet passage 113, so as to eliminate air leakage of the air outlet passage 113 between the valve body 12 and the valve cover 13.

As shown in fig. 1, the main valve 10 further includes an emergency piston 14 and a bleeding valve 15, the valve body 12 has a main valve chamber 121, a partition plate 122 is disposed in the valve body 12, the partition plate 122 divides the main valve chamber 121 into an upper chamber 1211 and a lower chamber 1212, the first channel 1111 is disposed in the upper chamber 1211, the emergency piston 14 is disposed in the upper chamber 1211, and the bleeding valve 15 is disposed in the lower chamber 1212. The emergency piston 14 can be used to drive the valve core of the air release valve 15 to move, and the air release valve 15 can be used to close the upper cavity 1211 or release air in the upper cavity 1211.

In this embodiment, the emergency piston includes a valve seat and a valve core, the valve seat is disposed through the partition plate, the valve seat has a valve port communicating the upper cavity and the lower cavity, the valve core is disposed through the valve port in a vertically floating manner and extends into the upper cavity, the air pressure in the pilot valve 20 is utilized to support the air release valve 15, and the air release valve 15 closes the valve seat.

Use the utility model provides an emergency valve has following beneficial effect:

(1) After the air enters the emergency valve, the air firstly enters the main valve 10, and sequentially passes through the transversely extending air inlet passage 111, the vertically extending flow guide passage 112 and the transversely extending air outlet passage 113, and enters the air inlet of the pilot valve cavity 21 from the air outlet of the air outlet passage 113, the air inlet of the air inlet passage 111 is positioned on the first side of the valve body 12, the valve cover 13 is arranged on the second side opposite to the first side of the valve body 12, the dust filter plug 30 is arranged in the air outlet passage 113 and connected with the passage wall of the air outlet passage 113, the dust filter plug 30 is provided with a dust filter passage extending transversely, and as the dust filter plug 30 is arranged in the transversely extending air inlet passage 111, dust or impurities cannot be deposited on the dust filter plug 30 due to gravity factors, so that the air vent of the dust filter plug 30 cannot be blocked, and the pilot valve cavity 21 can be inflated;

(2) The air inlet channel 111 comprises a first channel 1111 and a second channel 1112, the air outlet channel 113 comprises a third channel 1131 and a fourth channel 1132, a first sealing ring 41 and a second sealing ring 42 are clamped between the valve body 12 and the valve cover 13, the first sealing ring 41 is arranged around the periphery of the air inlet channel 111, the second sealing ring 42 is arranged around the periphery of the air outlet channel 113, the air inlet channel 111 can be sealed by the first sealing ring 41, further, the air leakage of the air inlet channel 111 between the valve body 12 and the valve cover 13 is eliminated, the air outlet channel 113 can be sealed by the second sealing ring 42, further, the air leakage of the air outlet channel 113 between the valve body 12 and the valve cover 13 is eliminated.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms do not have special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

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. An emergency valve, comprising:

the main valve (10), the main valve (10) is provided with a pilot valve inlet channel (11), the pilot valve inlet channel (11) comprises an inlet channel (111), a flow guide channel (112) and an outlet channel (113) which are communicated in sequence, the inlet channel (111) and the outlet channel (113) both extend along the transverse direction, and the flow guide channel (112) extends along the vertical direction;

the pilot valve (20), the pilot valve (20) is connected with the main valve (10), the pilot valve (20) is provided with a pilot valve cavity (21), and the air outlet of the air outlet channel (113) is communicated with the air inlet of the pilot valve cavity (21);

and the dust filtering shrinkage plug (30), the dust filtering shrinkage plug (30) is arranged in the air outlet channel (113), or the air inlet of the dust filtering shrinkage plug (30) is communicated with the air outlet of the air outlet channel (113).

2. The emergency valve according to claim 1, wherein the inlet channel (111) and the outlet channel (112) are connected by a first connection (114), the outlet channel (113) and the inlet channel (112) are connected by a second connection (115), the first connection (114) is located above the second connection (115), and the second connection (115) is located in the middle of the outlet channel (112).

3. The emergency valve according to claim 1, wherein the dust filter plug (30) is arranged in the outlet channel (113) and connected to a channel wall of the outlet channel (113), the dust filter plug (30) having a laterally extending dust filter channel.

4. The emergency valve according to claim 1, wherein the main valve (10) comprises a valve body (12) and a valve cover (13) connected to each other, the pilot valve (20) is connected to a bottom wall of the valve body (12), an air inlet of the air inlet channel (111) is located on a first side of the valve body (12), the valve cover (13) is disposed on a second side opposite to the first side of the valve body (12), the flow guide channel (112) comprises a communication hole (131) disposed on the valve cover (13), the communication hole (131) extends vertically and both ends of the communication hole (131) have a closed structure (132), and the air inlet channel (111) and the air outlet channel (113) are both communicated with a side wall of the communication hole (131).

5. The emergency valve according to claim 4, wherein the air inlet passage (111) comprises a first passage (1111) and a second passage (1112), the first passage (1111) is provided to the valve body (12) in a transverse direction, the second passage (1112) is provided to the valve cover (13) in a transverse direction, an air inlet of the second passage (1112) is provided to a sidewall of the valve cover (13) and communicates with an air outlet of the first passage (1111), and an air outlet of the second passage (1112) communicates with a sidewall of the communication hole (131).

6. The emergency valve according to claim 4, wherein the gas outlet channel (113) comprises a third channel (1131) and a fourth channel (1132), the third channel (1131) is transversely disposed on the valve cover (13), the fourth channel (1132) is transversely disposed on the valve body (12), a gas inlet of the third channel (1131) is communicated with a side wall of the communication hole (131), a gas outlet of the third channel (1131) is disposed on a side wall of the valve cover (13) and is communicated with a gas inlet of the fourth channel (1132), and a gas outlet of the fourth channel (1132) is communicated with the pilot valve chamber (21).

7. The emergency valve according to claim 4, wherein the closing structure (132) comprises a blocking piece (1321), the blocking piece (1321) being inserted at a lower end of the communication hole (131) and connected with the communication hole (131).

8. The emergency valve according to claim 4, further comprising a first sealing ring (41) and a second sealing ring (42) interposed between the valve body (12) and the valve cover (13), wherein the first sealing ring (41) is disposed around an outer periphery of the inlet passage (111), and the second sealing ring (42) is disposed around an outer periphery of the outlet passage (113).

9. The emergency valve according to claim 1, wherein the pilot valve inlet channel (11) further comprises a transition channel (116), one end of the transition channel (116) is communicated with the outlet of the outlet channel (113), and the other end of the transition channel (116) is communicated with the inlet of the pilot valve chamber (21).

10. The emergency valve according to claim 5, wherein the main valve (10) further comprises an emergency piston (14) and a blow-off valve (15), the valve body (12) has a main valve chamber (121), a partition plate (122) is arranged in the valve body (12), the partition plate (122) divides the main valve chamber (121) into an upper chamber (1211) and a lower chamber (1212), the first channel (1111) is arranged in the upper chamber (1211), the emergency piston (14) is arranged in the upper chamber (1211), and the blow-off valve (15) is arranged in the lower chamber (1212).