Emergency breakaway valve
By introducing a double safety structure into the breakaway valve, including a breakaway bolt and a safety pin, the problem of existing breakaway valves failing to disconnect effectively under overload is solved, achieving reliable sealing of the medium and stable operation of the equipment.
Patent Information
- Application Number
- CN202520670449.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-10
AI Technical Summary
When faced with overload forces, existing breakaway valves are prone to failure to disconnect effectively due to deviation or bending of the breakaway bolts. This results in a gap between the valve disc and the valve body, which cannot effectively seal the medium and poses a risk of medium leakage.
The design incorporates a dual-safety structure, including a break-through bolt and a safety pin. The break-through bolt breaks first under overload conditions, providing initial cushioning. The safety pin shears and breaks when abnormal tension reaches its limit, ensuring valve body separation. The valve disc is then sealed by the spring, achieving a dual-safety function.
It effectively prevents media leakage, avoids unforeseen serious accidents, improves the reliability and stability of the equipment, ensures orderly separation under abnormal tension of different intensities and durations, and reduces equipment damage.
Smart Images
Figure CN223953380U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to valve technical field, especially an emergency pull-off valve. BACKGROUND
[0002] The pull-off valve is a safety protection device designed for transmitting all kinds of fluid medium pipeline system, prevents the serious safety hidden danger caused by the over expected load force acting in the pipeline, is widely used in petroleum, chemical industry, natural gas, liquefied petroleum gas and other fields, especially plays a vital role in the high-risk fluid conveying system. Because in these industries, the transportation and storage of fluid (such as gasoline) usually involve extreme conditions, any leakage can lead to disastrous consequences, so the emergency pull-off valve is an important part of the industrial safety system, and has irreplaceable strategic significance for preventing major industrial accidents.
[0003] The existing pull-off valve generally includes left and right valve bodies, valve clappers and reset springs, pull-off bolts and the like, and when working, the medium input connector and the output connector at the two sides of the valve body are connected between the medium output equipment (such as the oil tank for storing gasoline) pipeline and the medium input equipment (such as the vehicle for transporting gasoline, and the pipeline connected with the medium input equipment is generally a high-strength flexible pipeline) through the pipeline. During the medium input and output process, if the over expected load force is affected by external vibration, impact or error operation and other external factors, the multiple pull-off bolts connecting the left and right valve bodies are broken, the two valve bodies are separated, and the two valve clappers are sealed to the valve body sealing seat connected with the output medium output equipment and the medium input equipment under the action of the reset spring force, thereby preventing the leakage of the medium. Although the existing pull-off valve meets the needs of safe medium input and output to some extent, its shortcomings are also obvious due to its own structure. Specifically, the multiple pull-off bolts of the current pull-off valve can only break in the radial force, and due to the influence of different angles of overloading force and its own mass factors, it is equivalent to only having one insurance function. When, for example, one of the pull-off bolts deviates due to the overloading force (for example, its strength is relatively large due to the influence of manufacturing process), it does not break effectively, or it only bends, the limiting mechanism between the two valve bodies cannot be separated, and the valve clapper cannot move to the position under the action of the spring force. As a result, there is a gap between the valve clapper and the valve body combination part, which cannot effectively block the medium, and the leakage of the medium will cause unpredictable serious accidents. UTILITY MODEL CONTENTS
[0004] In order to overcome the drawbacks of the existing pull-off valve due to the limitation of structure, the utility model provides with double insurance function, in the actual application, when the overload caused by external various forces, the safety pin can be effectively broken under the action of shearing force when the pull-off bolt is not disconnected, and then the two valve bodies are separated, the valve clappers inside the two valve bodies are moved to the position under the action of spring force, the sealing, effective plugging medium is realized between the combination part of the valve clapper and the valve body, which prevents the medium leakage from causing unpredictable serious accident.
[0005] The utility model solves the technical scheme that the technical problem adopts:
[0006] An emergency pull-off valve, including left valve body assembly, reset spring, left valve clapper, sealing gasket, energy storage sealing ring, sealing valve seat assembly, right valve clapper, right valve body assembly, still have safety assembly, the inside outer end of left valve body assembly, right valve body assembly is fixedly installed with a plurality of fixed seat respectively, at least two reset springs are respectively movably sleeved in the guide groove of the inside outer end of left valve body assembly, right valve body assembly, the guide rod of left valve clapper, right valve clapper outside is movably sleeved in two reset springs, at least two sets of sealing valve seat assemblies are fixedly installed in the inside end of left valve body assembly, right valve body assembly respectively, energy storage sealing ring is fixedly installed in the inside outer end of left valve body assembly, and left valve body assembly and right valve body assembly are fixedly installed together, the safety assembly has a plurality of sets, and the number of fixed seat is consistent, and each set of safety assembly includes safety pin and pull-off bolt, and one end of pull-off bolt has mounting hole, and safety pin is fixedly installed in mounting hole, and the other end of pull-off bolt has outer thread, and the outer diameter of the middle part of pull-off bolt is less than the outer diameter of both sides, and a plurality of sets of safety assembly are fixedly installed together with left valve body assembly, right valve body assembly, and safety pin is located at the outside of a plurality of fixed seats.
[0007] Further, the sealing gasket is installed between the sealing valve seat assembly and the left valve body assembly and the right valve body assembly.
[0008] Further, the inside sealing ring of the right valve body assembly is in sealing contact with the side end of the energy storage sealing ring.
[0009] Further, the energy storage sealing ring is composed of an outer ring and an inner ring, the outer ring is polytetrafluoroethylene, and the inner ring spring is stainless steel.
[0010] Further, the guide groove in the left valve body assembly and the right valve body assembly and the inside end of the left valve body assembly and the right valve body assembly have a flow-through channel.
[0011] Further, the length of the guide rod outside the left valve clapper and the right valve clapper is less than the length of the guide groove, and the outer diameter of the guide rod is less than the inner diameter of the guide groove.
[0012] Further, the positioning rod inside the left valve clapper is slidably located in the positioning groove inside the right valve clapper.
[0013] The utility model has the beneficial effects that compared with the prior art: the utility model has safety pin and breakaway bolt as the overload force safety assembly of valve body, has double insurance function, in practical application, when various external forces (such as the displacement of vehicle that transports gasoline pulls the hose and equipment) lead to overload, the breakaway bolt does not break off and bend (the radial force and shear force generated are not enough), the safety pin can be effectively broken when being affected by radial force and shear force, and then two valve bodies are separated, the valve clappers in the inside of two valve bodies move to the position under the action of spring force, sealing is realized between the valve clapper and the combination part of valve body, medium is effectively blocked, and the occurrence of unpredictable serious accidents caused by medium leakage is prevented, and the utility model has good application prospect. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the schematic diagram of the utility model's tight overall sectional structure.
[0015] Figure 2 It is the schematic diagram of the utility model's structure under bolt small shaft breakaway state.
[0016] Figure 3 It is the schematic diagram of the utility model's structure under safety pin shearing state.
[0017] Figure 4 It is the schematic diagram of the utility model's left valve body structure under breakaway state.
[0018] Figure 5 It is the schematic diagram of the utility model's right valve body structure under breakaway state.
[0019] Figure 6 It is the schematic diagram of the utility model's tight safety assembly structure. DETAILED DESCRIPTION
[0020] Figure 1 、 2As shown in Figures 3, 4, 5, and 6, an emergency disconnect valve includes a left valve body assembly 1, a return spring 2, a left valve disc 3, a sealing gasket 4, an energy storage sealing ring 5 (for sealing), a sealing valve seat assembly 6, a right valve disc 7, and a right valve body assembly 8, and also has a safety component 9. The left valve body assembly 1 and the right valve body assembly 8 each have three annularly distributed fixing seats 10 with openings at their inner and outer ends. Two return springs 2 are respectively laterally movably fitted into guide grooves 11 (with shaft holes at the outer ends to facilitate left or right movement of the guide rods) at the outer ends of the middle inner parts of the left valve body assembly 1 and the right valve body assembly 8. The guide rods 12 at the middle outer parts of the left valve disc 3 and the right valve disc 7 are respectively movably fitted into the two return springs 2. Two sets of sealing valve seat assemblies 6 are respectively fixedly installed at the inner ends of the left valve body assembly 1 and the right valve body assembly 8 (the sealing valve seat assembly 6 is installed between the left valve body assembly 1 and the right valve body assembly 8). A sealing gasket 4 and an annular energy storage sealing ring 5 are fixedly installed on the left side of the inner outer end of the left valve body assembly 1. The left valve body assembly 1 and the right valve body assembly 8 are fixed together by bolts and nuts. There are three sets of safety components 9, which are the same number as the number of fixed seats 10. Each set of safety components includes a safety pin 91 and a pull-off bolt 92. The left end of the pull-off bolt 92 has a mounting hole distributed from top to bottom. The safety pin 91 is vertically fixed (interference fit) in the mounting hole. The right end of the pull-off bolt 92 has an external thread. The outer diameter of the middle part 921 of the pull-off bolt 92 is smaller than the outer diameter of the two sides. The three sets of safety components are respectively horizontally fitted into the three fixed seats 10 openings of the left valve body assembly 1 and the right valve body assembly 8. The right side of the pull-off bolt 92 of the three sets of safety components is fixed by nuts to seal and fix the left valve body assembly 1 and the right valve body assembly 8 together. The safety pin 91 is located on the outside of the left fixed seat 10.
[0021] Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, the right end of the energy storage sealing ring 5 and the inner annular sealing ring 81 of the right valve body assembly 8 are in sealed contact. The energy storage sealing ring 5 consists of an outer ring and an inner ring; the outer ring is made of polytetrafluoroethylene (PTFE), and the inner ring spring is made of stainless steel. The guide groove 11 at the outer end of the middle inner side of the left valve body assembly 1 and the right valve body assembly 8, and the inner end of the left valve body assembly 1 and the right valve body assembly 8, form a hollow structure serving as a medium flow channel 13. The guide rod 12 at the middle outer side of the left valve disc 3 and the right valve disc 7 is shorter than the length of the guide groove 11, and the outer diameter of the guide rod 12 is smaller than the inner diameter of the guide groove 11. The positioning rod 31 on the inner side of the left valve disc slides within the positioning groove 71 on the inner side of the right valve disc. When the left valve body assembly 1 and the right valve body assembly 8 are combined, the inner sides of the left valve disc 3 and the right valve disc 7 are spaced apart from the sealing valve seat assembly 6 inside the left valve body assembly 1 and the right valve body assembly 8, respectively, allowing the medium to flow in and out of the left valve body assembly 1 and the right valve body assembly 8; when the left valve body assembly 1 and the right valve body assembly 8 are separated, the inner sides of the left valve disc 3 and the right valve disc 7 are in sealing contact with the sealing valve seat assembly 6 inside the left valve body assembly 1 and the right valve body assembly 8, respectively.
[0022] Figure 1 、 2, 3, 4, 5, 6, other use methods of the new type and the existing pull-off valve are consistent, the left valve body assembly 1, the right valve body assembly 8 are respectively connected between the medium output equipment (such as the oil tank for storing gasoline) pipeline and the medium input equipment (such as the vehicle for transporting gasoline, the pipeline connected with the medium input equipment is generally a high-strength flexible pipeline) pipeline. Specifically, the medium with pressure enters from the flow-through channel 13 of the left valve body assembly 1, and then flows out from the flow-through channel 13 of the right valve body assembly 8 into the related equipment (at this moment, the positioning rod 31 inside the left valve disc slides into the positioning groove 71 inside the right valve disc, the left valve body assembly 1 and the right valve body assembly 8 are combined together, the inside of the left valve disc 3 and the right valve disc 7 is respectively spaced from the sealing valve seat assembly 6 inside the left valve body assembly 3 and the right valve body assembly 8, and the medium can flow into and flow out from the left valve body assembly 1 and the right valve body assembly 7). During the medium input and output process, if the three safety assemblies connected with the left valve body assembly 1 and the right valve body assembly 8 are broken due to external vibration, impact or external force factors such as incorrect operation, the left valve body assembly 1 and the right valve body assembly 8 are separated, the positioning rod 31 inside the left valve disc no longer slides into the positioning groove 71 inside the right valve disc, and the left valve disc 3 and the right valve disc 7 are in sealing contact with the sealing valve seat assembly 6 inside the left valve body assembly 1 and the right valve body assembly 8 under the action of the return spring 2, thereby preventing the leakage of the medium output by the medium output equipment and the medium input by the medium input equipment. In the new type, one end of the pull-off bolt 92 is provided with a safety pin 91, the pull-off bolt 92 has a special structure and contains a small shaft (the outer diameter of which is smaller than the outer diameters of other positions), the small shaft is a key component of the pull-off bolt 92 and constitutes a structural basis of a double insurance mechanism together with the safety pin 91. Specifically, when the new type reaches a preset valve value (such as a radial tensile force) due to external force, the pull-off force of the small shaft of the pull-off bolt 92 causes it to break first, thereby releasing part of the pull-off force in time and providing preliminary buffer protection for the equipment. If the abnormal pull-off force continues to increase and reaches the bearing limit of the safety pin 91, the safety pin 91 will be sheared (radial force and shear force), which facilitates the smooth separation of the left valve body assembly 1 and the right valve body assembly 8. This design makes the small shaft of the pull-off bolt as the first breaking point and the first safety measure against abnormal pull-off force, and makes the safety pin as the second shear point and the second safety measure, thereby achieving double safety protection measures (under normal working conditions, the pull-off bolt and the safety pin work together, the safety pin can assist the pull-off bolt to disperse part of the stress and play a role in enhancing the stability of the connection; the pull-off bolt provides basic connection strength, while the safety pin serves as an additional strong defense line to effectively prevent connection failure caused by accidental factors. At the same time, the pull-off bolt and the safety pin are independent components, which are easy to check and replace after breaking or shearing), which facilitates the smooth separation of the left and right valve bodies.Specifically, by means of the one-time fracture and shearing process of the two stages of the bolt small shaft and the safety pin, the new type can be gradually separated in an orderly and controllable manner when facing abnormal tension of different intensity and duration, serious damage to the equipment caused by excessive tension can be avoided, and the reliability and stability of the new type during the working process are greatly improved.
[0023] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, for those skilled in the art, obviously, the utility model is limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model.
[0024] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, the description manner of the specification is only for the sake of clarity, those skilled in the art should regard the specification as a whole, the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.
Claims
1. An emergency pull apart valve comprising a left valve body assembly, a return spring, a left valve disc, a gasket, an energy storage seal, a seal seat assembly, a right valve disc, a right valve body assembly, characterized in that, It also has a safety component; the inner side of the left valve body component and the right valve body component is fixedly installed with a plurality of fixed seats, and at least two return springs are movably sleeved in the guide grooves on the inner side of the left valve body component and the right valve body component; the guide rods on the outer side of the left valve disc and the right valve disc are movably sleeved in the two return springs, and at least two sets of sealing valve seat assemblies are fixedly installed on the inner side of the left valve body component and the right valve body component, an energy storage sealing ring is fixedly installed on the inner side of the left valve body component, and the left valve body component and the right valve body component are fixedly installed together; the safety component has multiple sets, and the number of the safety component is consistent with the number of the fixed seat, each set of the safety component includes a safety pin and a broken bolt, one end of the broken bolt has a mounting hole, the safety pin is fixedly installed in the mounting hole, the other end of the broken bolt has external threads, the outer diameter of the middle part of the broken bolt is smaller than the outer diameters of the two sides, multiple sets of the safety component are used to fixedly install the left valve body component and the right valve body component together, and the safety pin is located outside the plurality of fixed seats.
2. An emergency breakaway valve according to claim 1, wherein The sealing valve seat assembly is installed between the left valve body component and the right valve body component.
3. An emergency breakaway valve according to claim 1, wherein The side end of the energy storage sealing ring is in sealing contact with the inner sealing ring of the right valve body component.
4. An emergency breakaway valve according to claim 1, wherein The energy storage sealing ring is composed of an outer ring and an inner ring, the outer ring is polytetrafluoroethylene, and the inner ring spring is stainless steel.
5. An emergency breakaway valve according to claim 1, wherein The guide grooves in the left valve body component and the right valve body component have flow channels between the inner side of the left valve body component and the right valve body component.
6. An emergency breakaway valve according to claim 1, wherein The length of the guide rod on the outer side of the left valve disc and the right valve disc is less than the length of the guide groove, and the outer diameter of the guide rod is less than the inner diameter of the guide groove.
7. An emergency breakaway valve according to claim 1 wherein, The positioning rod on the inner side of the left valve disc is slidably located in the positioning groove on the inner side of the right valve disc.