CN215721071U - Overpressure protection joint, overpressure protection valve and manifold - Google Patents

Abstract

The utility model discloses an overpressure protection joint, an overpressure protection valve and a manifold, relates to the technical field of pipeline structures, and aims to solve the technical problem that machining precision requirements are high due to the fact that a steel ball and a valve seat are matched and sealed in safety valves in related technologies. The overpressure protection joint comprises a joint body and a blasting body. The joint body is provided with a flow passage penetrating through the joint body, and the joint body is provided with a connecting part. The blasting body sets up in connecting this internally, and blasting body shutoff runner. The connector body is connected with the output end of the fluid through the connecting part, and the blasting body is broken when the fluid in the flow channel is in overpressure. The overpressure protection fitting is used to control the fluid pressure in the pipe not to exceed a prescribed value.

Description

Overpressure protection joint, overpressure protection valve and manifold

Technical Field

The utility model relates to the technical field of pipeline structures, in particular to an overpressure protection joint, an overpressure protection valve and a manifold.

Background

When a pipe transports a liquid or a gas (hereinafter, referred to as a fluid), a mechanical safety valve is widely used for controlling the pressure of the fluid in the pipe not to exceed a predetermined value. In the related art, the mechanical safety valve presses the steel ball against the valve seat through the elastic force of the spring in the valve body, so that the sealing effect of the safety valve is realized. However, the steel ball and the valve seat are sealed by metal, and the requirement on the machining precision of the steel ball and the valve seat is high. If the machining precision of the steel ball and the valve seat does not meet the requirement, the safety valve is easy to leak, so that sealing failure is caused, and the function of overpressure protection is finally lost.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an overpressure protection joint, an overpressure protection valve and a manifold, and aims to solve the technical problem that machining precision requirements are high due to the fact that a steel ball and a valve seat are matched and sealed in a safety valve in the related technology.

In order to achieve the above purpose, the embodiment of the utility model adopts the following technical scheme:

an overpressure protection connector is used for being connected with a fluid output end and comprises a connector body and a blasting body. The joint body is provided with a flow passage penetrating through the joint body, and the joint body is provided with a connecting part. The blasting body sets up in connecting this internally, and blasting body shutoff runner. The connector body is connected with the output end of the fluid through the connecting part, and the blasting body is broken when the fluid in the flow channel is in overpressure.

The overpressure protection fitting provided by the present application may be connected to a fluid output of a pipe or valve. When the pressure of the fluid does not exceed the specified value, the fluid is blocked by the blasting body in the joint body. When the pressure of the fluid exceeds a prescribed value, the burst body is ruptured. The fluid flows out from the joint body, so that the purpose of fluid pressure relief is achieved, and the safety of the pipeline is protected.

Different from the way that a steel ball is matched with a valve seat in a mechanical safety valve, the overpressure protection joint provided by the application can control the fluid pressure in a pipeline not to exceed a specified value through the rupture of the blasting body. But the machining of the overpressure protection joint does not need the matching of parts, and the machining precision requirement is low, so that the machining difficulty is reduced.

In some embodiments, a mounting cavity is arranged in the joint body and is communicated with the flow passage, the aperture of the mounting cavity is larger than that of the flow passage, and the blasting body comprises a blasting head and a blasting disc. The blasting head is installed in the installation cavity, and the blasting head is provided with a first through hole communicated with the flow channel. The blasting disk is arranged in the first through hole and blocks the first through hole.

The explosion body is designed into a detachable structure, so that the explosion body can be replaced after being broken, the joint body can be reused, and the cost input of the overpressure protection joint is saved.

In some embodiments, the overpressure protection joint further comprises a pressing cap installed in the installation cavity, the pressing cap is provided with a second through hole communicated with the first through hole, and the blasting body abuts against the installation cavity through the pressing cap. When the blasting body needs to be replaced, the pressure cap can be detached from the connector body, and the broken blasting body is taken out and replaced by a new blasting body.

In some embodiments, the mounting cavity includes a first cavity section and a second cavity section. The blasting body is inserted in the first cavity section. The outer side wall of the pressing cap is provided with external threads, the side wall of the second cavity section is provided with internal threads, and the pressing cap is connected into the second cavity section through threads. The pressing cap is simple and convenient to install and detach in a threaded screwing mode, and the blasting body is easy to replace.

In some embodiments, the overpressure protection joint further includes a sealing ring, a sealing surface is provided between the mounting cavity and the flow channel, the sealing surface is provided with a sealing groove, the sealing ring is mounted in the sealing groove, and an end face of one end of the bursting head abuts against the sealing ring. The sealing ring can prevent fluid from leaking from a gap between the blasting body and the joint body, so that the sealing performance of the overpressure protection joint is ensured.

In some embodiments, the connecting portion is a connecting ring disposed at one end of the connector body, and the connector body is connected to the output end of the fluid through the cooperation of the connecting piece and the connecting ring. The connecting part is designed into a structural form of a connecting ring, so that the connector body can be connected with the fluid output end of a pipeline or a valve through connecting pieces such as a buckle or a hoop.

In another aspect, an embodiment of the present invention further provides an overpressure protection valve, which includes a valve body and an overpressure protection joint according to any one of the above technical solutions. The inlet end of the valve body is connected with the output end of the fluid. The overpressure protection joint is connected with the outlet end of the valve body through a connecting part. When the overpressure protection joint is used for an overpressure protection valve, the technical effects are the same as those of the overpressure protection joint provided by the previous embodiment, and the description is omitted here. In addition, when the burst body is ruptured, the flow of the fluid can be shut off by closing the valve body, thereby preventing the fluid from continuously leaking.

In some embodiments, the overpressure protection valve further comprises a nut and a plurality of arcuate flaps. A plurality of arc fender lamella laminate respectively in the periphery that connects the body, and with connecting portion butt, every arc fender lamella is provided with the fender head towards the one end of valve body. The nut slides and cup joints in the periphery that connects the body, and the one end that the nut is close to the valve body is provided with the internal thread, and the one end that the valve body was kept away from to the nut is provided with the retaining ring. Wherein, the exit end of valve body is provided with the external screw thread, nut and the exit end threaded connection of valve body, retaining ring and fender head butt, connect the body through a plurality of arc fender lamella butts in the exit end of valve body.

The nut is connected with the valve body through threads, so that the overpressure protection joint can be tightly pressed at the outlet end of the valve body. The method not only ensures the connection reliability of the overpressure protection joint, but also has simple and convenient operation and is beneficial to the quick replacement of the overpressure protection joint.

In some embodiments, the valve body is a pilot operated stopcock. The hydraulic control plug valve can be opened and closed through hydraulic remote control, so that the function of pipeline overpressure protection remote control is realized, and the safety problem caused by field operation of operators is avoided.

In another aspect, an embodiment of the present invention further provides a manifold, which includes a pipeline and the overpressure protection valve according to any one of the above technical solutions, wherein an inlet end of the overpressure protection valve is communicated with the pipeline. When the overpressure protection valve is used in a manifold, the technical effects of the overpressure protection valve provided by the previous embodiment are the same, and the description is omitted here.

Drawings

Fig. 1 is a schematic structural diagram of a manifold provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of an overpressure protection valve provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of an overpressure protection fitting provided in an embodiment of the present application;

FIG. 4 is a cross-sectional structural view of the fitting body of FIG. 3;

fig. 5 is a schematic perspective view of the blasting body in fig. 3;

FIG. 6 is a schematic perspective view of the pressing cap of FIG. 3;

FIG. 7 is a schematic cross-sectional view of the overpressure protection fitting of FIG. 2 coupled to a valve body;

FIG. 8 is an enlarged partial schematic view of the connection of the overpressure protection fitting to the valve body of FIG. 7.

Reference numerals:

100-a pipe;

200-overpressure protection valve;

210-overpressure protection joint; 211-a joint body; 2111-flow channel; 2112-installation cavity; 21121-first lumen section; 21122-a second cavity section; 212-blasting body; 2121-blasting head; 2122-blasting disk; 2123-a first via; 213-pressing the cap; 2131-a second through hole; 214-a sealing ring; 215-sealing face; 216-seal groove; 217-connecting ring; 218-a connecting trough;

220-a valve body;

230-a connection assembly; 231-a nut; 2311-a retainer ring; 232-arc baffle flaps; 2321-stop; 233-sealing ring.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The valve core of the mechanical safety valve generally adopts a sealing structure with a steel ball matched with a valve seat, so that metal sealing is realized. The spring is pressed by adjusting a bolt of the mechanical safety valve, and provides elasticity to press the steel ball, so that sealing between the steel ball and the valve seat is realized.

Because the steel ball and the valve seat are sealed by metal, the requirement on the machining precision of the steel ball and the valve seat is high. If the machining precision of the steel ball and the valve seat does not meet the requirement, the safety valve is easy to leak, so that the sealing is failed, and the overpressure protection function is lost.

In addition, after the safety valve is opened, the steel ball or the valve seat can be seriously eroded due to the erosion action of fluid, the sealing effect is lost, and even the safety valve is scrapped. If the safety valve can not work normally, the normal fluid conveying operation of the whole manifold can be influenced.

The present application provides a manifold, as shown in fig. 1, comprising a conduit 100 and an overpressure protection valve 200. The plurality of pipes 100 may be provided, and the adjacent pipes 100 may be connected by a connection structure such as a tee joint, a four-way joint, or a flange. The over-pressure protection valve 200 may be connected to a pipe formed by the pipe 100 by a tee joint, a four-way joint, or a flange for protecting the pipe from a problem in which the pipe 100 bursts due to the fluid pressure within the pipe exceeding a prescribed value.

The manifold can be a fracturing manifold, a throttling manifold or a pressure test manifold and other manifold structures used for conveying high-pressure fluid. The present application is not intended to be limited to any particular type of manifold.

The overpressure protection valve 200 provided herein differs from a mechanical safety valve in that, as shown in fig. 2, the overpressure protection valve 200 may include an overpressure protection fitting 210, a valve body 220, and a connection assembly 230. Wherein, the valve body 220 can be selected from a plug valve, a ball valve or a block valve. The present application does not specifically limit the type of the valve body 220.

The overpressure protection fitting 210 may be coupled to the outlet end of the valve body 220 by one set of coupling assemblies 230, and the inlet end of the valve body 220 may be coupled to a coupling structure such as a tee, cross, or flange by another set of coupling assemblies 230. The connecting component 230 may be a fastener or a hoop, and the application does not specially limit the specific structure of the connecting component 230.

On this basis, the present application provides an overpressure protection fitting 210, as shown in fig. 3, the overpressure protection fitting 210 may include a fitting body 211, a burst body 212, and a pressure cap 213. As shown in fig. 4, a flow passage 2111 and a mounting cavity 2112 are provided in the joint body 211. Therein, the mounting cavity 2112 may include a first cavity segment 21121 and a second cavity segment 21122.

It will be appreciated that the bore of mounting cavity 2112 is larger than the bore of flow passage 2111. The aperture of the second chamber section 21122 may be equal to the aperture of the first chamber section 21121, or the aperture of the second chamber section 21122 may be larger than the aperture of the first chamber section 21121. The burst body 212 is mounted in the first chamber section 21121 and the pressure cap 213 is mounted in the second chamber section 21122.

In some embodiments, the burst body 212 is slidably inserted into the first chamber section 21121. The outer sidewall of the gland 213 may be externally threaded and the sidewall of the second chamber section 21122 may be internally threaded. Thus, the pressure cap 213 may be threadably connected within the second chamber section 21122, abutting the burst body 212 within the first chamber section 21121.

In some other embodiments, the pressure cap 213 may also be connected within the second chamber section 21122 by a slight interference, as may the explosive body 212 abutting within the first chamber section 21121. Alternatively, the burst body 212 may be directly threaded or slightly interference coupled within the first chamber section 21121. At this time, the design of the press cap 213 can be omitted.

It should be noted that the overpressure protection fitting 210 may also include a sealing ring 214, as shown in FIG. 3. As shown in fig. 4, since the bore diameter of mounting cavity 2112 is larger than the bore diameter of flow passage 2111, there is a sealing surface 215 between mounting cavity 2112 and flow passage 2111. The sealing surface 215 may be provided with a sealing groove 216, and the seal ring 214 may be fitted into the sealing groove 216.

The end face of one end of the burst body 212 may abut the sealing ring 214 in the sealing groove 216, thereby achieving sealing between the burst body 212 and the joint body 211 and preventing fluid from leaking out of the gap between the burst body 212 and the joint body 211.

Of course, the sealing groove 216 may be formed on the outer wall of the burst body 212 or the inner wall of the joint body 211. The packing 214 is installed on the outer sidewall of the burst body 212 or the inner sidewall of the coupling body 211. The function of sealing the overpressure protection fitting 210 can also be achieved.

As shown in fig. 5, the blasting body 212 may include a blasting head 2121 and a blasting disk 2122. The bursting head 2121 can be configured as a cylinder, and the bursting head 2121 has a first through hole 2123 therethrough. The first through hole 2123 communicates with the flow passage 2111, and the aperture of the first through hole 2123 may be equal to the aperture of the flow passage 2111. A burst disk 2122 may be disposed within the first through-hole 2123 to block the first through-hole 2123. Of course, the blasting head 2121 may be provided in a square or polygonal tubular structure.

As shown in fig. 6, the pressure cap 213 may have a cylindrical structure, and the pressure cap 213 may have a second through hole 2131 therethrough. The second through hole 2131 communicates with the first through hole 2123, and the aperture of the second through hole 2131 may be equal to the aperture of the first through hole 2123. Of course, the pressing cap 213 may be provided in a square or polygonal cylindrical structure.

It should be noted that the disk 2122 may be designed to match the mechanical properties of the different materials so that the disk 2122 may rupture at a given fluid pressure. For example, 0.5 mm stainless steel sheet may be used for the rupture disk 2122 when the fluid pressure is 0.1 mpa. The thickness and material of the burst disk 2122 may be varied to match the fluid pressure within the pipe 100 or valve body 220 when the fluid pressure is higher or lower.

The burst disk 2122 can block the flow of fluid as it flows into the fitting body 211. The burst disk 2122 ruptures when the fluid pressure within the pipe 100 or valve body 220 exceeds a prescribed value. The fluid flows out of the connector body 211, so that the fluid in the pipe 100 or the valve body 220 is decompressed, and the overpressure protection is realized.

Wherein, due to the valve body 220 arranged on the pipe 100, when the rupture disk 2122 is ruptured, the valve body 220 can be closed to stop the fluid in the pipe 100 from flowing out of the overpressure protection joint 210, thereby preventing the fluid from continuously leaking.

Of course, the valve body 220 may be a hydraulically controlled stopcock valve. When hydraulic oil flows in from the oil inlet of the hydraulic control plug valve, the direction of a valve core runner hole of the hydraulic control plug valve driven by the hydraulic oil is consistent with that of a valve body runner hole, and the hydraulic control plug valve is in an opening state. When hydraulic oil flows in from the oil outlet of the hydraulic control plug valve, the direction of a valve core flow passage hole of the hydraulic control plug valve driven by the hydraulic oil is vertical to the direction of a valve body flow passage hole, and the hydraulic control plug valve is in a closed state, so that continuous leakage of fluid can be prevented. The pilot operated plug valve enables remote control of the overpressure protection of the pipeline 100, thereby avoiding safety issues for the operator due to field operations.

The present application does not specifically limit the type of the valve body 220, and any valve type capable of controlling the on/off of the fluid in the pipe 100 may be used. Such as a ball valve or a block valve. Of course, the overpressure protection joint 210 may also be directly connected to the pipeline 100 through a connection structure such as a tee joint, a four-way joint, or a flange, and the like, and can also perform an overpressure protection function on the fluid in the pipeline 100. However, the burst disk 2122 is ruptured and cannot effectively control the continuous leakage of fluid. It can be seen that the output end of the fluid can be either the output end of the pipe 100 or the output end of the valve body 220.

The rupture disk 2122 may be directly provided in the flow passage 2111 of the joint body 211. The rupture disk 2122 ruptures when the fluid pressure within the pipe 100 or valve body 220 exceeds a predetermined value, again providing overpressure protection. However, when the rupture disk 2122 is ruptured, the entire overpressure protection fitting 210 needs to be replaced, which increases the cost of use.

Therefore, the design of the blasting body 212 as a combined blasting head 2121 and the blasting disk 2122 allows the blasting body 212 to be replaced independently, thereby saving the use cost of the overpressure protection joint 210.

To achieve the connection between the overpressure protection fitting 210 and the valve body 220, in some embodiments, as shown in fig. 4, an outer sidewall of the fitting body 211 may be provided with a connection portion 21, for example. The coupling portion 21 may include a coupling ring 217 and a coupling groove 218 provided at an outer sidewall of the joint body 211 for coupling with the valve body 220. Of course, the connecting portion 21 may be designed in the form of a screw, a flange, or a fastener. The present application does not specifically limit the structural form of the connection portion 21.

For example, the connection groove 218 may be opened at one end of the joint body 211 along the circumferential direction of the outer sidewall of the joint body 211. The connecting groove 218 is spaced from the end of the joint body 211, so that the end of one end of the joint body 211 forms a connecting ring 217. Thus, the outer diameter of the joint body 211 at the position of the connecting groove 218 is smaller than the outer diameter of the joint body 211 at the rest position.

Based thereon, as shown in fig. 7, the connecting assembly 230 may include a nut 231 and an arc-shaped flapper 232. Wherein, the inner side wall of one end of the nut 231 can be provided with an internal thread, and the outer side wall of the outlet end of the valve body 220 can be provided with an external thread. In this manner, the nut 231 may be threadably connected to the outlet end of the valve body 220.

In addition, as shown in fig. 8, a retaining ring 2311 may be disposed on the inner side wall of the other end of the nut 231, the inner diameter of the retaining ring 2311 is smaller than the inner diameter of the nut 231, and the inner diameter of the retaining ring 2311 is larger than the outer diameter of the joint body 211, so that the nut 231 can be slidably sleeved on the outer side wall of the joint body 211.

The outer sidewall of the arc-shaped baffle 232 may be provided with a baffle 2321. Wherein, the number of arc-shaped retaining flaps 232 can be set to three, and the three arc-shaped retaining flaps 232 are respectively attached in the connecting groove 218 around the periphery of the joint body 211. The stop 2321 faces the retaining ring 2311 on the nut 231, the three-petal arc-shaped stop petals 232 are respectively abutted to the connecting ring 217, and the retaining ring 2311 on the nut 231 is respectively abutted to the stop 2321 on the arc-shaped stop petals 232.

Of course, the number of the arc-shaped baffle flaps 232 can also be set to be two, four or more flaps according to the external dimension of the joint body 211. The specific number of arcuate flaps 232 is not specifically limited in this application.

When the overpressure protection joint 210 is connected, firstly, the nut 231 is sleeved on the joint body 211 in a sliding mode, then the three-piece arc-shaped baffle 232 is attached to the connecting groove 218 around the periphery of the joint body 211 respectively, and the three-piece arc-shaped baffle 232 is abutted to the connecting ring 217.

Then, the nut 231 is slid to the outlet end of the valve body 220, and the nut 231 is screwed to the outlet end of the valve body 220. At this time, the retainer ring 2311 of the nut 231 abuts against the stopper 2321 of the arc-shaped stopper 232, and the stopper 2321 presses the joint body 211 against the outlet end of the valve body 220 via the connecting ring 217.

It is understood that the connection between the overpressure protection fitting 210 and the outlet end of the valve body 220 may also be a screw thread, a hoop, or a snap. The manner of connection between the overpressure protection fitting 210 and the outlet end of the valve body 220 is not particularly limited in this application.

Furthermore, as shown in FIG. 8, a sealing ring 233 may be provided between the overpressure protection fitting 210 and the outlet end of the valve body 220 to prevent fluid from leaking out of the gap between the overpressure protection fitting 210 and the outlet end of the valve body 220.

The overpressure protection valve 200 of the present application controls the pressure of the fluid within the pipe 100 or valve body 220 to not exceed a specified value by the rupture of the rupture disk 2122 within the overpressure protection fitting 210. The problem of sealing fit between the steel ball and the valve seat is solved, and the technical problem of high machining precision requirement caused by the fact that the steel ball and the valve seat are matched and sealed is solved.

Therefore, the overpressure protection valve 200 is less difficult to manufacture than a mechanical safety valve. At the same time, the overpressure protection fitting 210 may also perform the same function as a mechanical safety valve. In addition, after the overpressure protection valve 200 is depressurized, the flow of the fluid can be closed by the valve body 220, so that the continuous leakage of the fluid is avoided. After the rupture disk 2122 ruptures, the overpressure protection function is restored by replacing the burst body 212. After the steel ball and the valve seat of the mechanical safety valve are eroded, the steel ball and the valve seat become permanent damage, and the overpressure protection function cannot be recovered.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. An overpressure protection fitting for connection to a fluid output, comprising:

the connector comprises a connector body, a connecting piece and a connecting piece, wherein the connector body is provided with a flow channel penetrating through the connector body; and the number of the first and second groups,

the blasting body is arranged in the joint body and used for plugging the flow channel;

the connector body is connected with the fluid output end through the connecting part, and the blasting body is broken when the fluid in the flow channel is in overpressure.

2. The overpressure protection fitting of claim 1 wherein said fitting body has a mounting cavity disposed therein in communication with said flow passage, said mounting cavity having a larger bore diameter than said flow passage, said burst body including:

the blasting head is arranged in the mounting cavity and is provided with a first through hole communicated with the flow channel; and the number of the first and second groups,

and the blasting disc is arranged in the first through hole and blocks the first through hole.

3. The overpressure protection fitting of claim 2, further comprising a pressure cap mounted within said mounting cavity, said pressure cap defining a second through-hole in communication with said first through-hole, said rupture body abutting within said mounting cavity through said pressure cap.

4. The over-pressure protection fitting according to claim 3, wherein said mounting cavity comprises a first cavity section and a second cavity section;

the blasting body is inserted into the first cavity section;

the outer side wall of the pressing cap is provided with external threads, the side wall of the second cavity section is provided with internal threads, and the pressing cap is connected into the second cavity section through threads.

5. The overpressure protection fitting of claim 2, further comprising a sealing ring, wherein a sealing surface is disposed between said mounting cavity and said flow passage, said sealing surface defines a sealing groove, said sealing ring is mounted in said sealing groove, and an end surface of one end of said bursting head abuts against said sealing ring.

6. The overpressure protection fitting of any one of claims 1-5, wherein said connection portion is a coupling ring disposed at one end of said fitting body, said fitting body being connected to said fluid output port by engagement of a connector with said coupling ring.

7. An over-pressure protection valve, comprising:

the inlet end of the valve body is connected with the output end of the fluid; and the number of the first and second groups,

an overpressure protection fitting as claimed in any one of claims 1 to 6 connected to the outlet end of the valve body by said connection.

8. The over-pressure protection valve according to claim 7, further comprising:

the arc-shaped retaining flaps are respectively attached to the periphery of the joint body and abutted against the connecting part, and a retaining head is arranged at one end, facing the valve body, of each arc-shaped retaining flap; and the number of the first and second groups,

the nut is sleeved on the periphery of the joint body in a sliding mode, an internal thread is arranged at one end, close to the valve body, of the nut, and a check ring is arranged at one end, far away from the valve body, of the nut;

the outlet end of the valve body is provided with external threads, the nut is in threaded connection with the outlet end of the valve body, the retainer ring is abutted to the blocking head, and the joint body is abutted to the outlet end of the valve body through the arc-shaped blocking flaps.

9. The over-pressure protection valve according to claim 7, wherein said valve body is a pilot operated stopcock.

10. A manifold comprising a conduit and an overpressure protection valve as claimed in any one of claims 7 to 9, an inlet end of the overpressure protection valve being in communication with the conduit.

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