A pilot pressure balanced filler valve

Abstract

This utility model belongs to the technical field of fuel filler shut-off valves, and discloses a pilot pressure balanced fuel filler shut-off valve, including a valve body. A ring is screwed into the top of the valve body, and a valve plate is connected to the bottom of the ring. A valve core is inserted through the center of the valve plate. A first fixing nut is provided at one end of the valve core near the ring, and a support plate is fixedly connected to the other end of the valve core via a second fixing nut. The other end of the support plate is fixedly connected to a rotating shaft. A wrench is connected to one end of the rotating shaft through the side wall of the valve body, and a fusion mechanism is also connected to the side of the wrench near the bottom of the valve body. This device can respond quickly in an emergency. Its fire-resistant structural design meets both the sealing requirements under normal temperature conditions and the fire resistance requirements in the event of a fire. The medium is not easily leaked, meeting the sealing characteristics of fire resistance tests. It also prevents valve core jamming and effectively prevents valve opening difficulties caused by medium pressure.

Description

Technical Field

[0001] This utility model relates to the technical field of fuel filler shut-off valves, specifically a pilot pressure balanced fuel filler shut-off valve. Background Technology

[0002] The refueling plug isolation valve is used in airport apron fuel supply systems. It closes after refueling to prevent fuel leakage or siphon backflow from the refueling plug nozzle. Isolation valves are mandatory in airport fuel lines to ensure the safety of fuel depots. The refueling plug isolation valve is installed in the apron well and is used in conjunction with an API 4" well valve. In case of well valve maintenance or malfunction, the valve can be manually closed to prevent fuel leakage, making it a reliable protective device.

[0003] Existing fuel filler valves, due to their special installation environment and application, need to be quickly shut off in emergency situations and accidental fires to prevent oil leakage and thus serve as safety protection devices. However, most traditional valves require ground staff to bend over or squat down and manually operate them using a special handle (usually a T-shaped handle). Furthermore, the valves have poor fire resistance in critical areas, and when closed, the large diameter of the valve exerts significant pressure on the valve plate. Manual operation to open the valve plate can easily cause the valve core to jam, making it time-consuming and laborious to open. Utility Model Content

[0004] The purpose of this invention is to provide a pilot pressure balanced fuel filler shut-off valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pilot pressure balanced filler valve includes a valve body, a threaded ring is screwed into the top of the valve body, a valve plate is connected to the bottom of the threaded ring, a valve core is disposed through the center of the valve plate, a first fixing nut is disposed at one end of the valve core near the threaded ring, a support plate is fixedly connected to the other end of the valve core by a second fixing nut, the other end of the support plate is fixedly connected to a rotating shaft, a wrench is connected to one end of the rotating shaft through the side wall of the valve body, and a fusion mechanism is also connected to the side of the wrench near the bottom of the valve body.

[0007] More preferably, the fusion mechanism includes a fixing hook fixedly disposed on the outside of the bottom connecting flange of the valve body by a second fixing bolt, the other end of the fixing hook being fixedly connected to the fusion plate, and the other end of the fusion plate being connected to a wrench by a connecting hook strip.

[0008] More preferably, the fuse is composed of a first fuse and a second fuse, and the overlapping portion of the first fuse and the second fuse has a welding area.

[0009] More preferably, the ends of the first fuse and the second fuse that are far apart from each other are provided with connecting holes, and the connecting hole on the first fuse is connected to the connecting hook, and the connecting hole on the second fuse is connected to the fixing hook.

[0010] More preferably, the wrench is further provided with a baffle, and a first fixing bolt is provided on the outer side of the baffle, and the first fixing bolt passes through the baffle and the wrench and is connected to the end of the rotating shaft.

[0011] More preferably, a bushing is also fitted on the outside of the rotating shaft, and a torsion spring is also provided on the outside of the bushing. The torsion spring acts to drive the support plate to rotate around the rotating shaft.

[0012] More preferably, a fireproof component is further provided between the bushing and the valve body sidewall. The fireproof component includes a step seal located on the outside of the bushing near the inner cavity of the valve body. A plurality of packing support rings are provided at the end of the step seal away from the inner cavity of the valve body. Sealing packing is filled between two adjacent packing support rings. A bushing plug is provided on the other side of the packing support ring away from the step seal. A sealing ring is also provided between the bushing plug and the rotating shaft, and the sealing ring is located between the bushing and the wrench.

[0013] More preferably, the insert ring has a stepped structure, and a sealing element is provided between the plane where the insert ring connects to the valve body; a vulcanized rubber sealing ring is provided between the insert ring and the valve plate, and the vulcanized rubber sealing ring is embedded in the top surface of the valve plate and connected to the insert ring.

[0014] More preferably, a vulcanized rubber sealing ring is provided at the connection between the valve core and the bottom surface of the valve plate. A plurality of connecting holes are evenly provided circumferentially at one end of the valve core near the bottom surface of the valve plate. A pressure relief hole is provided axially inside the valve core. The outlet end of the pressure relief hole is located at one end of the first fixing nut. The connecting holes and the pressure relief hole are interconnected.

[0015] More preferably, a spring is provided between the valve core and the first fixing nut, and a retaining ring is provided at the end of the valve core near the first fixing nut; the valve core and the second fixing nut are also fixedly connected by a cotter pin.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] A fusible link mechanism is installed between the wrench and the valve body. The fusible link uses a fusible alloy that melts at an appropriate temperature and possesses the required strength. It is designed to immediately close the valve under normal open conditions in case of an emergency, such as a fire or damage. The fusible link features a two-piece design, machined from thin sheet metal, with the overlapping portion welded at low temperature using a fusible alloy. This ensures strength while allowing for rapid response upon melting, enabling the valve to close quickly.

[0018] By installing a fireproof component between the bushing and the valve body sidewall; installing a vulcanized rubber sealing ring at the connection between the valve core and the bottom surface of the valve plate; and installing a vulcanized rubber sealing ring between the insert and the valve plate, the fireproof structure design at these three locations can meet the sealing requirements under normal temperature conditions as well as the fireproof requirements in the event of a fire. The medium is not easy to leak, and it meets the sealing characteristics of the fireproof test.

[0019] By evenly arranging multiple connecting holes around the valve core near the bottom of the valve plate, and axially arranging pressure relief holes inside the valve core, with the connecting holes and pressure relief holes interconnected, the entire valve has a pilot pressure relief and balancing function. This effectively prevents the valve from being difficult to open under medium pressure. In use, a wrench is used to rotate the rotating shaft, which in turn causes the support plate to rotate the valve plate around the rotating shaft. The entire process involves first pulling the valve core, and after the pressure is balanced, the entire valve plate is then pulled to rotate, which effectively prevents the valve core from getting stuck.

[0020] In summary, this device can respond quickly in emergency situations. Its fire-resistant structural design meets both the sealing requirements under normal temperature conditions and the fire protection requirements in the event of a fire. The medium is not prone to leakage, meets the sealing characteristics of fire-resistant tests, and also prevents valve core jamming, effectively preventing valve opening difficulties caused by medium pressure. Attached Figure Description

[0021] Figure 1 This is a vertical sectional view of the overall structure of the isolation valve of this utility model in the closed state;

[0022] Figure 2 This is a horizontal sectional view of the overall structure of the isolation valve of this utility model in the closed state;

[0023] Figure 3 This is a schematic diagram of the fuse mechanism structure of the isolation valve in the normally open state of this utility model;

[0024] Figure 4 This utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0025] Figure 5 This is a schematic diagram of the fuse element structure of this utility model;

[0026] In the diagram: 1. Valve body; 2. Insert ring; 3. Seal; 4. Valve plate; 5. Support plate; 6. Snap ring; 7. Spring; 8. First fixing nut; 9. Valve core; 10. Second fixing nut; 11. Cotter pin; 12. Vulcanized rubber sealing ring; 14. Rotating shaft; 15. Torsion spring; 16. Sealing packing; 17. Packing support ring; 18. Step seal; 19. Bushing plug; 20. Sealing ring; 21. Bushing; 22. Baffle; 23. First fixing bolt; 24. Second fixing bolt; 25. Fixing hook; 26. Fusible link; 27. Connecting hook; 28. Wrench; 29. ​​Connecting hole; 30. Pressure relief hole; 31. First fusible link; 32. Second fusible link; 33. Welding area. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-5 This utility model provides a technical solution:

[0029] A pilot pressure balanced filler valve includes a valve body 1. A ring 2 is screwed into the top of the valve body 1. A valve plate 4 is connected to the bottom of the ring 2. A valve core 9 is disposed through the center of the valve plate 4. A first fixing nut 8 is disposed at one end of the valve core 9 near the ring 2. A support plate 5 is fixedly connected to the other end of the valve core 9 by a second fixing nut 10. The other end of the support plate 5 is fixedly connected to a rotating shaft 14. A wrench 28 is connected to one end of the rotating shaft 14 through the side wall of the valve body 1. A fusion mechanism is also connected to the side of the wrench 28 near the bottom of the valve body 1.

[0030] In this invention, the fusing mechanism includes a fixed hook 25 fixedly mounted on the outside of the bottom connecting flange of the valve body 1 by a second fixing bolt 24. The other end of the fixed hook 25 is fixedly connected to a fusing piece 26, and the other end of the fusing piece 26 is connected to a wrench 28 via a connecting hook 27. The fusing piece 26 is composed of a first fusing piece 31 and a second fusing piece 32, and a welding area 33 is provided in the overlapping portion of the first fusing piece 31 and the second fusing piece 32. Connecting holes are provided at the ends of the first fusing piece 31 and the second fusing piece 32 that are far apart from each other. The connecting hole on the first fusing piece 31 is connected to the connecting hook 27, and the connecting hole on the second fusing piece 32 is connected to the fixed hook 25. The wrench 28 also includes a stop plate 22, on the outside of which a first fixing bolt 23 is provided. The first fixing bolt 23 passes through the stop plate 22 and the wrench 28 and is connected to the shaft end of the rotating shaft 14. The fuse element 26 is a two-piece design consisting of a first fuse element 31 and a second fuse element 32. Both the first fuse element 31 and the second fuse element 32 are machined from thin sheet metal. The overlapping part, i.e., the welding area 33, is fixedly connected by low-temperature welding using a fusible alloy. This design ensures strength while allowing for rapid response upon melting, enabling the valve to close quickly. The base material of the fuse element 26 is H62 copper alloy, and the fusible alloy used for welding is a bismuth-lead-tin alloy with a melting temperature of 95±3℃. The three elements, lead, bismuth, and tin, are mixed in a specific ratio. Based on the design principle of the eutectic temperature point of eutectic alloys, the alloy is required to transform from a solid to a liquid state within the temperature range of 95±3℃, thereby greatly and rapidly reducing its strength to achieve the expected melting temperature requirement.

[0031] In this utility model, a bushing 21 is also sleeved on the outside of the rotating shaft 14, and a torsion spring 15 is also provided on the outside of the bushing 21. The torsion spring 15 acts to drive the support plate 5 to rotate around the rotating shaft 14.

[0032] In this invention, a fireproof component is also provided between the bushing 21 and the side wall of the valve body 1. The fireproof component includes a step seal 18 located on the outside of the bushing 21 near the internal cavity of the valve body 1. Multiple packing support rings 17 are provided at the end of the step seal 18 away from the internal cavity of the valve body 1. Sealing packing 16 is filled between adjacent packing support rings 17. A bushing plug 19 is provided on the other side of the packing support ring 17 away from the step seal 18. A sealing ring 20 is also provided between the bushing plug 19 and the rotating shaft 14, and the sealing ring 20 is located between the bushing 21 and the wrench 28. The sealing packing 16 is composed of graphite and nickel wire, and its cross-section is disc-shaped with a low coefficient of friction, thus not affecting the rotation of the rotating shaft 14. The end near the internal cavity of the valve body 1 is sealed by the step seal 18, and the external sealing ring 20 provides redundant sealing. In a fire-prone environment, sealing ring 20 fails, but the 16 sections of graphite sealant in the sealing packing play a major role at high temperatures and can still achieve effective sealing to prevent media leakage.

[0033] In this invention, the insert ring 2 has a stepped structure, and a sealing element 3 is provided between the insert ring 2 and the plane connecting the valve body 1; a vulcanized rubber sealing ring 12 is provided between the insert ring 2 and the valve plate 4, and the vulcanized rubber sealing ring 12 is embedded in the top surface of the valve plate 4 and connected to the insert ring 2. The seal between the valve plate 4 and the insert ring 2 is achieved by the vulcanized rubber sealing ring 12 on the valve plate 4. In a fire environment, the vulcanized rubber sealing ring 12 fails, and the rubber material loses its elasticity. Under the pressure inside the valve body 1 and the action of the torsion spring 15, the metal surface of the valve plate 4 seals with the metal surface of the insert ring 2, still meeting the sealing requirements of API 6FA.

[0034] In this invention, a vulcanized rubber sealing ring 12 is provided at the connection between the valve core 9 and the bottom surface of the valve plate 4. Multiple connecting holes 29 are evenly arranged circumferentially on the end of the valve core 9 near the bottom surface of the valve plate 4. A pressure relief hole 30 is axially arranged inside the valve core 9, with its outlet end located at one end of the first fixing nut 8. The connecting holes 29 and the pressure relief hole 30 are interconnected. A spring 7 is also provided between the valve core 9 and the first fixing nut 8. A retaining spring 6 is also provided at the end of the valve core 9 near the first fixing nut 8. The retaining spring 6 is used to limit and fix the first fixing nut 8, while the spring 7, under the action of the spring 7, drives the first fixing nut 8 to reset after the valve plate 4 is fully opened, thereby driving the valve core 9 to reset. The valve core 9 and the second fixing nut 10 are also fixedly connected by a cotter pin 11. When the fuel filler shut-off valve is closed, the valve plate 4 experiences significant pressure under the pressure of the pipeline medium (approximately 5000N under a medium force of 0.5MPa), and the wrench 28 cannot directly open the valve plate 4. Structurally, a valve core 9, its connecting hole 29, and a pressure relief hole 30 are incorporated. After the wrench 28 is turned, the valve core 9 is first opened slightly, allowing the medium to be discharged through the valve core 9, its connecting hole 29, and the pressure relief hole 30 into the connection chamber between the fuel filler shut-off valve and the well valve. Once the pressure is balanced, the valve plate 4 can be easily opened.

[0035] Example 1: In use, the device is first installed between the well valve and the pipeline. During use, the device is in the normally open state. At this time, if... Figure 3 As shown, the wrench 28 is fixedly connected to the outside of the connecting flange at the bottom of the valve body 1 via the connecting hook 27, the fusible link 26, and the fixing hook 25. The internal valve plate 4 is in the open state under the action of the rotating shaft 14, the torsion spring 15, the support plate 5, the valve core 9, and the second fixing nut 10. In an emergency, when the external temperature reaches 95±3℃, the fusible alloy in the welding area 33 between the first fusible link 31 and the second fusible link 32 changes from solid to liquid, thus melting. When the first fusible link 31 and the second fusible link 32 are disconnected, the rotating shaft 14 rotates in the opposite direction under the drive of the torsion spring 15, which in turn drives the support plate 5 to rotate. Under the action of the second fixing nut 10, the support plate 5 drives the valve core 9 to rotate around the rotating shaft 14, ultimately driving the valve plate 4 to rotate around the rotating shaft 14 to the position where it seals with the insert ring 2. At the same time, the valve core 9 moves upward under the action of the spring 7 to the position where it seals with the insert ring 2. Figure 1At the indicated location, the circumferential connecting hole 29 and the axial pressure relief hole 30 of the valve core 9 are also sealed inside the valve plate 4, ensuring no leakage. Simultaneously, the insert ring 2 has a stepped structure, and a sealing element 3 is provided between the insert ring 2 and the plane connecting the valve body 1; a vulcanized rubber sealing ring 12 is provided between the insert ring 2 and the valve plate 4, and the vulcanized rubber sealing ring 12 is embedded in the top surface of the valve plate 4 and connected to the insert ring 2. The seal between the valve plate 4 and the insert ring 2 is achieved by the vulcanized rubber sealing ring 12 on the valve plate 4. In a fire environment, the vulcanized rubber sealing ring 12 fails, and the rubber material loses its elasticity. Under the pressure inside the valve body 1 and the action of the torsion spring 15, the metal surface of the valve plate 4 seals with the metal surface of the insert ring 2, still meeting the API 6FA sealing requirements. A fireproof component is also provided between the bushing 21 and the side wall of the valve body 1. The fireproof component includes a step seal 18 located on the outside of the bushing 21 near the internal cavity of the valve body 1. Multiple packing support rings 17 are provided at the end of the step seal 18 away from the internal cavity of the valve body 1. Sealing packing 16 is filled between adjacent packing support rings 17. A bushing plug 19 is provided on the other side of the packing support rings 17 away from the step seal 18. A sealing ring 20 is also provided between the bushing plug 19 and the rotating shaft 14, and the sealing ring 20 is located between the bushing 21 and the wrench 28. The sealing packing 16 is composed of graphite and nickel wire, and its cross-section is disc-shaped with a low coefficient of friction, so it does not affect the rotation of the rotating shaft 14. The end near the internal cavity of the valve body 1 is sealed by the step seal 18, and the external sealing ring 20 provides redundant sealing. In a fire-prone environment, sealing ring 20 fails, but the 16 sections of graphite sealant in the sealing packing play a major role at high temperatures and can still achieve effective sealing to prevent media leakage.

[0036] Example 2: When the device needs to be opened from its closed state, the wrench 28 first rotates the rotating shaft 14, thereby rotating the support plate 5 on the outside of the rotating shaft 14. Under the action of the support plate 5, the valve core 9 is initially opened to a small degree. The medium is discharged through the valve core 9, its connecting hole 29, and the pressure relief hole 30 into the connection chamber between the oil filler valve and the well valve. After the pressure is balanced, the wrench 28 is rotated again, and the support plate 5 and the valve core 9 further rotate the valve plate 4, thereby fully opening the valve plate 4. After the valve plate 4 is fully opened, the wrench 28 is fixedly connected to the outside of the connecting flange at the bottom of the valve body 1 using a new fusible link 26, a connecting hook 27, and a fixing hook 25, so that it is in the normally open state.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pilot pressure balanced filler valve, comprising a valve body (1), characterized in that: The valve body (1) has a screw-in ring (2) embedded in the top. The bottom of the ring (2) is connected to a valve plate (4). A valve core (9) is installed through the center of the valve plate (4). A first fixing nut (8) is provided at one end of the valve core (9) near the ring (2). A support plate (5) is fixedly connected to the other end of the valve core (9) through a second fixing nut (10). The other end of the support plate (5) is fixedly connected to a rotating shaft (14). A wrench (28) is connected through the side wall of the valve body (1). A fusion mechanism is also connected to the side of the wrench (28) near the bottom of the valve body (1).

2. The pilot pressure balanced type filler valve according to claim 1, characterized in that: The fusion mechanism includes a fixed hook (25) fixedly installed on the outside of the bottom connecting flange of the valve body (1) by a second fixing bolt (24). The other end of the fixed hook (25) is fixedly connected to the fusion piece (26), and the other end of the fusion piece (26) is connected to the wrench (28) by a connecting hook strip (27).

3. The pilot pressure balanced type filler valve according to claim 2, characterized in that: The fuse (26) is composed of a first fuse (31) and a second fuse (32), and the overlapping part of the first fuse (31) and the second fuse (32) is provided with a welding area (33).

4. A pilot pressure balanced filler valve according to claim 3, characterized in that: Both the first fuse (31) and the second fuse (32) have connecting holes at their ends that are far apart from each other. The connecting hole on the first fuse (31) is connected to the connecting hook (27), and the connecting hole on the second fuse (32) is connected to the fixing hook (25).

5. A pilot pressure balanced filler valve according to claim 1, characterized in that: The wrench (28) is also provided with a baffle (22), and a first fixing bolt (23) is provided on the outside of the baffle (22), and the first fixing bolt (23) passes through the baffle (22) and the wrench (28) and is connected to the shaft end of the rotating shaft (14).

6. A pilot pressure balanced filler valve according to claim 1, characterized in that: A bushing (21) is also fitted on the outside of the rotating shaft (14), and a torsion spring (15) is also provided on the outside of the bushing (21). The torsion spring (15) acts to drive the support plate (5) to rotate around the rotating shaft (14).

7. A pilot pressure balanced filler valve according to claim 6, characterized in that: A fireproof component is also provided between the bushing (21) and the side wall of the valve body (1). The fireproof component includes a step seal (18) located on the outside of the bushing (21) near the inner cavity of the valve body (1). A plurality of packing support rings (17) are provided on the end of the step seal (18) away from the inner cavity of the valve body (1). Sealing packing (16) is filled between two adjacent packing support rings (17). A bushing plug (19) is provided on the other side of the packing support ring (17) away from the step seal (18). A sealing ring (20) is also provided between the bushing plug (19) and the rotating shaft (14). The sealing ring (20) is located between the bushing (21) and the wrench (28).

8. A pilot pressure balanced filler valve according to claim 1, characterized in that: The insert (2) has a stepped structure, and a sealing element (3) is provided between the insert (2) and the plane connecting the valve body (1); a vulcanized rubber sealing ring (12) is provided between the insert (2) and the valve plate (4), and the vulcanized rubber sealing ring (12) is embedded in the top surface of the valve plate (4) and connected to the insert (2).

9. A pilot pressure balanced filler valve according to claim 1, characterized in that: A vulcanized rubber sealing ring (12) is also provided at the connection between the valve core (9) and the bottom surface of the valve plate (4). A plurality of connecting holes (29) are evenly provided circumferentially at one end of the valve core (9) near the bottom surface of the valve plate (4). A pressure relief hole (30) is provided axially inside the valve core (9). The outlet end of the pressure relief hole (30) is located at one end of the first fixing nut (8). The connecting hole (29) and the pressure relief hole (30) are interconnected.

10. A pilot pressure balanced filler valve according to claim 9, characterized in that: A spring (7) is also provided between the valve core (9) and the first fixing nut (8), and a retaining ring (6) is also provided at the end of the valve core (9) near the first fixing nut (8); the valve core (9) and the second fixing nut (10) are also fixedly connected by a cotter pin (11).

Images