CN218377858U - Pressure relief valve - Google Patents

Abstract

The utility model discloses a relief valve, including the installed part, disk seat and case, the installed part inlays and locates on the runner pipe, the installed part has the chamber of releasing, the shaping has a sealing on the chamber of releasing, the both ends intercommunication external world and the runner pipe in chamber of releasing, the chamber of releasing is suitable for and guides the interior circulation medium of runner pipe and flows to the external world, the disk seat sets up in the installed part, and set up on releasing the intracavity wall, case slidable ground sets up at the intracavity of releasing, the case is including the opening and closing piece and the urgent sealing member that are connected, wherein, the opening and closing piece is suitable for to set up and is keeping away from external one end, urgent sealing member is suitable for to set up and is being close to external one end. The opening and closing piece and the emergency sealing piece are arranged at the two ends of the valve core respectively, and only external force needs to be continuously applied in a release state, so that the valve core moves towards the direction of the circulation pipeline until the emergency sealing piece is abutted against the sealing part, the emergency sealing effect can be achieved, and the emergency sealing device has the advantages of being simple in structure, high in reliability, rapid in emergency sealing, simple in operation and the like.

Description

Pressure relief valve

Technical Field

The utility model relates to the technical field of valves, concretely relates to relief valve.

Background

A relief valve is a valve that regulates the flow of a medium by controlling the opening and closing of a closure member within a mounting member. When the pressure of the pressure container or the inner cavity of the valve exceeds a safe value, the opening and closing piece is opened through a transmission device or manually, and the medium in the valve is discharged through the discharge passage, so that the effect of reducing the medium pressure in the valve is realized.

Because the field that the bleeder valve was used is comparatively extensive, and the medium that the bleeder valve needs to contact in the different fields also is different, and the medium of transporting in chemical enterprises often has certain danger, if the in-process of bleeding causes the medium to stop leaking because of reasons such as equipment failure or manual operation are improper, can cause very serious environmental pollution, harm personal safety even.

In the bleed valve in the prior art, the leak stopping structure provided for preventing the situation that the leak cannot be stopped is often complex, which can increase the manufacturing difficulty of the whole valve and the manufacturing cost.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model discloses the technical problem that will solve lies in the defect that ends among the prior art and let out the structure owing to comparatively complicated, leads to valve manufacturing cost to improve.

Therefore, the utility model provides a relief valve, include:

the installation piece is embedded on the circulation pipeline and provided with a discharge cavity, a sealing part is formed on the discharge cavity, two ends of the discharge cavity are communicated with the outside and the circulation pipeline, and the discharge cavity is suitable for guiding the circulation medium in the circulation pipeline to flow out to the outside;

the valve seat is arranged in the mounting piece and arranged on the inner wall of the discharge cavity;

the valve core is slidably arranged in the drainage cavity and comprises a starting and closing piece and an emergency sealing piece which are connected, wherein the starting and closing piece is suitable for being arranged at one end far away from the outside, and the emergency sealing piece is suitable for being arranged at one end close to the outside;

the opening and closing piece is driven by medium pressure to abut against the valve seat so as to close the working sealing state of the discharge cavity; the valve seat moves towards the direction of the circulation pipeline under the driving of external force so as to communicate a drainage state of the circulation pipeline and the outside, and in the drainage state, the emergency sealing element and the sealing part are arranged at intervals; and the valve core moves towards the direction of a circulation pipeline under the driving of external force so as to enable the emergency sealing element and the sealing part to be mutually abutted and the drainage cavity to be closed.

Optionally, in the above pressure relief valve, the mounting part has a mounting protrusion formed on an inner wall of the relief cavity and protruding inward in a radial direction of the mounting part, the valve seat is mounted on a side wall surface of the mounting protrusion, and the sealing portion is another side wall surface of the mounting protrusion mounted opposite to the valve seat;

the valve core further comprises a connecting piece which is connected between the opening and closing piece and the emergency sealing piece, and the connecting piece is arranged in a channel formed by the mounting protrusion in a penetrating mode.

Optionally, in the above pressure relief valve, the valve seat is of a circular structure, the opening and closing member is arranged by the flow pipe in a tapered manner toward the outside, and the cross section of the opening and closing member is circular; or

The valve seat is of a square ring structure, and the opening and closing piece is of a pyramid structure.

Optionally, in the pressure relief valve, the emergency seal is tapered from the outside toward the flow passage, and the cross section of the emergency seal is circular.

Optionally, the pressure relief valve further includes a thrust member, and the thrust member is screwed to the mounting member and is coaxially disposed with the valve core;

the reset piece is arranged between the thrust piece and the opening and closing piece and has a driving force for driving the valve core to move towards the external direction.

Optionally, in the pressure relief valve, the reset member is a reset spring;

one end of the opening and closing piece, which is close to the reset spring, is provided with a guide part which is arranged in a protruding mode, and the reset spring is sleeved on the guide part.

Optionally, in the pressure relief valve, at least one auxiliary flow channel is formed in the mounting member, the auxiliary flow channel is suitable for being arranged in the same direction as the extending direction of the circulation pipeline, and the auxiliary flow channel is communicated with the relief cavity.

Optionally, in the pressure relief valve, a first thread structure is formed in the relief cavity;

the emergency sealing device is characterized by further comprising a transmission piece, one end of the transmission piece is connected with the emergency sealing piece, the other end of the transmission piece is suitable for being connected with an external execution piece, a second thread structure is formed on the transmission piece, and the first thread structure is screwed with the second thread structure;

the shaping has the bleed hole on the driving medium, the bleed hole is suitable for the intercommunication bleed chamber and external world.

Optionally, the pressure relief valve further includes an isolation component, the isolation component is disposed outside the flow conduit, and the isolation component is fixedly connected to the mounting member;

the isolation component is provided with a mounting hole which is suitable for communicating the discharge cavity with the outside.

Optionally, the above pressure relief valve further includes a sealing plug screw, the sealing plug screw is detachably screwed on the mounting hole, and the sealing plug screw is adapted to plug the mounting hole.

The technical scheme provided by the utility model, following advantage has:

1. the utility model provides a relief valve, including the installed part, valve seat and case, the installed part inlays and locates on the runner pipe, the installed part has the chamber of bleeding, it has a sealing to take shape on the chamber of bleeding, the both ends in chamber of bleeding communicate external world and runner pipe, the chamber of bleeding is suitable for the circulation medium that guides in the runner pipe flows out to the external world, the valve seat sets up in the installed part, and set up on the inner wall of the chamber of bleeding, the case slidable ground sets up in the chamber of bleeding, the case includes the opening and closing piece and the urgent sealing member that are connected, wherein, the opening and closing piece is suitable for setting up the one end of keeping away from the external world, the urgent sealing member is suitable for setting up the one end of being close to the external world, the opening and closing piece has the work encapsulated situation that the chamber of bleeding was mutually supported by opening and closing piece and valve seat under the drive of medium pressure; the valve seat moves towards the direction of the circulation pipeline under the driving of external force so as to communicate the circulation pipeline with the outside in a discharge state, and the emergency sealing piece and the sealing part are arranged at intervals in the discharge state; and the valve core moves towards the direction of the circulation pipeline under the driving of external force so as to enable the emergency sealing element and the sealing part to be mutually abutted and the drainage cavity to be closed.

The opening and closing pieces used for opening and closing the drainage state and the emergency sealing piece used for emergency sealing are arranged at the two ends of the valve core respectively, so that the pressure relief valve with the structure can simply realize the opening and closing of the drainage state, and only external force needs to be continuously applied in the drainage state to enable the valve core to move towards the direction of a circulation pipeline, so that the emergency sealing piece is abutted against the sealing part to achieve the emergency sealing effect, and the emergency sealing valve has the advantages of simple structure, high reliability, rapid emergency sealing, simplicity in operation and the like. In addition, when the valve core and the valve seat are in a sealing state in a butting mode, the high-pressure liquid in the circulating pipeline can also form pressure from the inside of the pipe to the outside of the pipe on the valve core, the butting of the valve core and the valve seat can be tighter by the pressure, and the sealing effect of the pressure release valve with the structure in the working sealing state is improved.

2. The utility model provides a relief valve, installed part have the shaping on the intracavity wall of releasing, and the installation that sets up along the radial direction inside protrusion of installed part is protruding, and the disk seat is installed on the bellied side wall face of installation, and the opposite side wall face of sealed portion for the relative disk seat installation of installation arch, case still include the connecting piece, connect between opening and close piece and urgent sealing member, and the connecting piece is worn to locate in the protruding passageway that forms of installation. When the pressure release valve is in a working sealing state, the valve seat bears the pressure from the valve core, the pressure is large, deformation is easy to generate, the mounting bulge which is arranged on the inner wall of the discharge cavity in a protruding mode can achieve the effect of stabilizing the valve seat, deformation generated by the valve seat is reduced, and therefore the pressure release valve with the structure is more reliable. When the pressure release valve is in a release state, the emergency sealing element is abutted against the sealing part of the side wall surface on the other side, opposite to the installation of the valve seat, of the installation bulge, so that the release cavity is blocked to realize a sealing effect, and the pressure release valve is simple in structure and easy to operate.

3. The utility model provides a relief valve still includes thrust piece and resets, and thrust piece connects soon on the installed part and with the coaxial setting of case, resets and sets up between thrust piece and opening and closing member, and the piece that resets has the drive power of driving valve element towards external direction motion. When operation relief valve carries out the action of releasing or the action of emergency seal, the case all can produce the motion towards circulation passageway relative the disk seat, and circulation medium in the circulation passageway can produce the power along circulation passageway's flow direction to the case, this part power can make the case produce the vibration in the intracavity of releasing, thereby make case and the intracavity wall frictional force of releasing increase, and then the degree of difficulty when increasing the case and reseing, through set up thrust piece and set up the piece that resets between thrust piece and the piece that opens and shuts on the installed part, and the piece that resets has the drive power of driving valve core towards external direction motion, can make the case reduce when carrying out the action of reseing required power, the operation degree of difficulty descends.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a cross-sectional view of a pressure relief valve provided in an embodiment of the present invention;

fig. 2 is a cross-sectional view of a relief valve provided in an embodiment of the present invention in a working sealed state;

fig. 3 is a cross-sectional view of a relief valve provided in an embodiment of the present invention in a relief state;

fig. 4 is a cross-sectional view of a relief valve provided in an embodiment of the present invention in an emergency sealing state;

description of reference numerals:

1-a mounting member; 11-a relief cavity; 12-mounting a projection; 13-an auxiliary flow channel;

2-valve seat;

3-a valve core; 31-an opening and closing member; 32-emergency seals; 33-a connector;

4-a thrust piece;

5-a reset piece;

6-a transmission member; 61-a bleed orifice;

7-an isolation component;

8-sealing screw plug.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The embodiment provides a relief valve, as shown in fig. 1 to 4, which includes a mounting member 1, a valve seat 2 and a valve core 3, the mounting member 1 is embedded in a circulation pipeline, the mounting member 1 has a relief cavity 11, a sealing portion is formed on the relief cavity 11, two ends of the relief cavity 11 are communicated with the outside and the circulation pipeline, the relief cavity 11 is suitable for guiding a circulation medium in the circulation pipeline to flow out to the outside, the valve seat 2 is disposed in the mounting member 1 and disposed on an inner wall of the relief cavity 11, the valve core 3 is slidably disposed in the relief cavity 11, the valve core 3 includes a connected opening and closing member 31 and an emergency sealing member 32, wherein the opening and closing member 31 is suitable for being disposed at one end far from the outside, the emergency sealing member 32 is suitable for being disposed at one end near the outside, the opening and closing member 31 is driven by a medium pressure to abut against the valve seat 2 to seal the working sealing state of the relief cavity 11, the valve seat 2 is driven by an external force to move towards the circulation pipeline to communicate the drainage state of the circulation pipeline with the outside, the emergency sealing member 32 is spaced from the sealing state under the sealing state.

The opening and closing piece 31 for opening and closing the drainage state and the emergency sealing piece 32 for emergency sealing are respectively arranged at the two ends of the valve core 3, so that the pressure relief valve with the structure can simply realize the opening and closing of the drainage state, and only external force needs to be continuously applied in the drainage state to enable the valve core 3 to move towards the direction of a circulation pipeline, and the emergency sealing piece 32 is abutted against the sealing part to achieve the emergency sealing effect. In addition, when the valve core 3 and the valve seat 2 are in a sealing state in a contact manner, the high-pressure liquid in the circulating pipeline can also form pressure from the inside of the pipeline to the outside of the pipeline on the valve core 3, and the valve core 3 and the valve seat 2 can be in closer contact by the pressure, so that the sealing effect of the relief valve with the structure in the working sealing state is improved.

In the pressure relief valve provided in this embodiment, as shown in fig. 1 to 4, the mounting member 1 has a mounting protrusion 12 formed on an inner wall of the relief cavity 11 and protruding inward along a radial direction of the mounting member 1, the valve seat 2 is mounted on a side wall surface of one side of the mounting protrusion 12, the sealing portion is a side wall surface of the other side of the mounting protrusion 12 mounted opposite to the valve seat 2, the valve element 3 further includes a connecting member 33 connected between the opening and closing member 31 and the emergency sealing member 32, and the connecting member 33 is inserted into a passage formed by the mounting protrusion 12. When the pressure release valve is in a working sealing state, the valve seat 2 bears the pressure from the valve core 3, the pressure is large, deformation is easy to generate, the installation bulge 12 which is arranged on the inner wall of the discharge cavity 11 in a protruding mode can achieve the effect of stabilizing the valve seat 2, deformation generated by the valve seat 2 is reduced, and therefore the pressure release valve with the structure is more reliable. When the relief valve is in the emergency sealing state, the emergency sealing element 32 is abutted against the sealing part of the side wall surface on the other side, which is installed relative to the valve seat 2, of the installation bulge 12, so that the relief cavity 11 is sealed, the sealing effect is realized, and the relief valve is simple in structure and easy to operate.

As an implementation manner of this embodiment, the mounting protrusion 12 is a circular protrusion and the valve seat 2 is a circular valve seat 2, the corresponding opening and closing member 31 is a cone, the emergency sealing member 32 is a ball, and the connecting member 33 is connected to the vertex angle of the cone of the opening and closing member 31 and the ball of the emergency sealing member 32. When the relief valve is in a working sealing state, the valve seat 2 is subjected to large pressure from the valve core 3 and is easy to deform, the annular bulge is arranged, the valve seat 2 can be stabilized, the deformation of the valve seat 2 is reduced, and the annular bulge can be matched with the conical opening and closing piece 31, so that even if the valve seat 2 deforms, the opening and closing piece 31 can still be tightly matched with the valve seat 2 by utilizing the inclined plane of the cone under the pressure of a circulating medium, and a good sealing effect is obtained. When the relief valve is in the emergency sealing state, the spherical emergency sealing element 32 is abutted against the side wall surface of the circular mounting protrusion 12 and is tightly matched with the side wall surface of the circular mounting protrusion 12, and a good sealing effect is also achieved.

Of course, the mounting protrusion 12 and the valve seat 2 are both circular rings, and the conical opening/closing member 31 and the spherical emergency sealing member 32 are only an optional embodiment, and a truncated cone-shaped opening/closing member 31, a spherical opening/closing member 31, or a hemispherical opening/closing member 31, and a conical emergency sealing member 32, a truncated cone-shaped emergency sealing member 32, or a hemispherical emergency sealing member 32, etc. may also be used in this embodiment, as long as the conical emergency sealing member can be closely fitted with the circular ring-shaped valve seat 2 and the mounting protrusion 12 when approaching the side wall surface of the valve seat 2 or the mounting protrusion 12.

As another possible implementation manner of this embodiment, the valve seat 2 and the mounting protrusion 12 are both rectangular rings, the corresponding opening and closing member 31 and the emergency sealing member 32 are both rectangular pyramids, and the connecting member 33 connects the top corner of the opening and closing member 31 and the top corner of the emergency sealing member 32, respectively.

The relief valve provided by this embodiment, as shown in fig. 1 to 4, further includes a thrust piece 4 and a resetting piece 5, the thrust piece 4 is screwed on the mounting piece 1 and is coaxially disposed with the valve element 3, the resetting piece 5 is disposed between the thrust piece 4 and the opening and closing piece 31, and the resetting piece 5 has a driving force that drives the valve element 3 to move toward the outside. When the relief valve is operated to perform a relief action or an emergency sealing action, the valve core 3 moves towards the flow channel relative to the valve seat 2, a flow medium in the flow channel generates a force along the flow direction of the flow channel to the valve core 3, and the valve core 3 swings in the relief cavity 11 due to the force, so that the friction force between the valve core 3 and the inner wall of the relief cavity 11 is increased, and the difficulty of the valve core 3 in resetting is increased.

Specifically, in this embodiment, the reset element 5 is a reset spring, one end of the opening and closing element 31 close to the reset spring is provided with a guide portion protruding, and the reset spring is sleeved on the guide portion. The relief valve having the above-described structure has an elastic force by a spring as a driving force for driving the spool 3 to move in the external direction, and can reduce the force required for the spool 3 to perform the reset operation. In addition, the spring sleeved on the guide part is supported by the guide part penetrating through the spring, so that the spring deforms or has reduced displacement when being subjected to pressure from the opening and closing piece 31, and the structural stability of the relief valve with the structure is improved.

The relief valve that this embodiment provided, as shown in fig. 1 to fig. 4, the shaping has two auxiliary flow channels 13 on the installed part 1, and two auxiliary flow channels 13 are coaxial to be set up in opposite directions, can set up the relief valve in other valves of circulation passageway when the relief valve of installation above-mentioned structure to with one of them auxiliary flow channel 13 intercommunication valve feed liquor side, another auxiliary flow channel 13 intercommunication valve play liquid side, auxiliary flow channel 13 is suitable for the syntropy setting with the extending direction of circulation pipeline, and auxiliary flow channel 13 and discharge chamber 11 intercommunication. Through setting up auxiliary flow channel 13 and coming intercommunication relief cavity 11 and circulation passageway for circulation medium among the circulation passageway is concentrated more when flowing to the relief valve, improves pressure release efficiency. Meanwhile, the auxiliary flow channels 13 arranged on the two sides of the valve can also discharge the pressure on the two sides simultaneously, so that the pressure relief efficiency is further improved.

The pressure relief valve that this embodiment provided, as shown in fig. 1 to fig. 4, still include driving medium 6, the shaping has first helicitic texture in the chamber 11 of bleeding, the one end and the urgent sealing member 32 of driving medium 6 are connected, the other end of driving medium 6 is suitable for and is connected with external executive component, the shaping has second helicitic texture on the driving medium 6, first helicitic texture connects with second helicitic texture soon, wherein, the shaping has the bleed hole 61 on the driving medium 6, the bleed hole 61 is suitable for intercommunication chamber 11 of bleeding and external world. The pressure release valve of above-mentioned structure passes through transmission piece 6 and connects urgent sealing member 32 to adopt threaded connection with transmission piece 6 and the chamber 11 of releasing, when the action of need carrying out the pressure release or urgent sealed action, only need screw in transmission piece 6 to drive case 3 and realize the motion towards circulation channel, easily operation. Simultaneously, through shaping bleeder hole 61 on the driving medium 6 come to communicate bleeder chamber 11 and external world to realize the function of bleeding.

The pressure relief valve provided by the embodiment, as shown in fig. 1 to fig. 4, further includes an isolation component 7, the isolation component 7 is disposed outside the flow pipeline, the isolation component 7 is fixedly connected with the mounting member 1, and the isolation component 7 has a mounting hole adapted to communicate the relief cavity 11 with the outside. Come with installed part 1 fixed connection through setting up isolation part 7 to isolation part 7 is last to have the intercommunication and to bleed chamber 11 and external mounting hole, makes the relief valve of above-mentioned structure flow medium can follow the mounting hole and let out when the pressure release, reduces the flow medium and splashes.

The pressure relief valve provided by the present embodiment, as shown in fig. 1 to 4, further includes a sealing screw 8, the sealing screw 8 is detachably screwed to the mounting hole, and the sealing screw 8 is adapted to block the mounting hole. According to the pressure release valve with the structure, the sealing plug screw 8 is additionally arranged on the mounting hole of the isolation part 7, the sealing plug screw 8 is screwed in to seal the mounting hole when the pressure release action is not required to be executed, the sealing performance of the pressure release valve is further improved, and the possibility that the pressure release valve is directly released through the mounting hole when accidental leakage occurs and the pressure release valve is not found in time is reduced.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A pressure relief valve, comprising:

the mounting piece (1) is embedded on a circulation pipeline, the mounting piece (1) is provided with a discharge cavity (11), a sealing part is formed on the discharge cavity (11), two ends of the discharge cavity (11) are communicated with the outside and the circulation pipeline, and the discharge cavity (11) is suitable for guiding a circulation medium in the circulation pipeline to flow out to the outside;

the valve seat (2) is arranged in the mounting piece (1) and arranged on the inner wall of the discharge cavity (11);

the valve core (3) is slidably arranged in the drainage cavity (11), the valve core (3) comprises a connecting opening and closing piece (31) and an emergency sealing piece (32), wherein the opening and closing piece (31) is suitable for being arranged at one end far away from the outside, and the emergency sealing piece (32) is suitable for being arranged at one end close to the outside;

the opening and closing piece (31) is driven by medium pressure to be in a working sealing state that the opening and closing piece (31) is mutually abutted with the valve seat (2) so as to close the discharge cavity (11); and the valve seat (2) moves towards the direction of the circulation pipeline under the driving of external force so as to communicate the drainage state of the circulation pipeline and the outside, and in the drainage state, the emergency sealing element (32) and the sealing part are arranged at intervals; and the valve core (3) moves towards the direction of a circulation pipeline under the driving of external force so as to enable the emergency sealing element (32) and the sealing part to be mutually abutted and the drainage cavity (11) to be closed in an emergency sealing state.

2. A pressure relief valve according to claim 1, characterized in that the mounting member (1) has a mounting protrusion (12) formed on an inner wall of the relief chamber (11) and protruding inward in a radial direction of the mounting member (1), the valve seat (2) is mounted on one side wall surface of the mounting protrusion (12), and the sealing portion is the other side wall surface of the mounting protrusion (12) mounted opposite to the valve seat (2);

the valve core (3) further comprises a connecting piece (33) connected between the opening and closing piece (31) and the emergency sealing piece (32), and the connecting piece (33) is arranged in a channel formed by the mounting protrusion (12) in a penetrating mode.

3. A pressure relief valve according to claim 2, characterized in that the valve seat (2) is of a circular ring-shaped configuration, the shutter (31) being arranged tapering from the flow conduit towards the outside and having a circular cross-section; or

The valve seat (2) is of a square ring structure, and the opening and closing piece (31) is of a pyramid structure.

4. A pressure relief valve according to claim 3, characterized in that the emergency seal (32) is arranged tapering from the outside towards the flow conduit, and that the emergency seal (32) is circular in cross-section.

5. A pressure relief valve according to any one of claims 1-4 further comprising a thrust member (4), said thrust member (4) being screwed onto said mounting member (1) and being arranged coaxially with said spool (3);

the reset piece (5), reset piece (5) set up in thrust piece (4) with open and close piece (31) between, reset piece (5) have the drive force that drives case (3) move towards the external world direction.

6. A pressure relief valve according to claim 5, characterized in that the resetting member (5) is a resetting spring;

one end of the opening and closing piece (31) close to the return spring is provided with a guide part which is arranged in a protruding mode, and the return spring is sleeved on the guide part.

7. A pressure relief valve according to claim 1, characterized in that the mounting member (1) is formed with at least one auxiliary flow channel (13), said auxiliary flow channel (13) being adapted to be arranged in the same direction as the extension of the flow line, and said auxiliary flow channel (13) communicating with the relief chamber (11).

8. A pressure relief valve according to claim 1, characterized in that a first thread structure is formed in the relief chamber (11);

the emergency sealing device is characterized by further comprising a transmission piece (6), one end of the transmission piece (6) is connected with the emergency sealing piece (32), the other end of the transmission piece (6) is suitable for being connected with an external execution piece, a second thread structure is formed on the transmission piece (6), and the first thread structure is screwed with the second thread structure;

a discharge hole (61) is formed in the transmission piece (6), and the discharge hole (61) is suitable for communicating the discharge cavity (11) with the outside.

9. A pressure relief valve according to claim 1, characterized in that it further comprises a spacer member (7), said spacer member (7) being arranged outside said flow conduit, said spacer member (7) being fixedly connected to the mounting member (1);

the isolation component (7) is provided with a mounting hole which is suitable for communicating the discharge cavity (11) with the outside.

10. A pressure relief valve according to claim 9 further comprising a sealing plug screw (8), said sealing plug screw (8) being removably screwed onto said mounting hole, said sealing plug screw (8) being adapted to block said mounting hole.

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