Emergency release structure for fluid loading device
Patent Information
- Application Number
- PCT/JP2025/041462
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-25
- Filing Date
- 2025-11-27
- Publication Date
- 2026-09-03
Smart Images
Figure JP2025041462_03092026_PF_FP_ABST
Abstract
Description
Emergency Release Structure for Fluid Loading / Unloading Apparatus
[0001] The present specification discloses an emergency release structure for a fluid loading / unloading apparatus.
[0002] Japanese Unexamined Patent Application Publication No. 2023-5594 discloses an emergency release structure for a fluid loading / unloading apparatus. This fluid loading / unloading apparatus is an apparatus that transports a fluid such as liquefied gas from an onshore facility to a tank of a ship. The emergency release structure for a fluid loading / unloading apparatus includes a pair of pipe sections, a valve body that seats on a valve seat formed in a flow passage of the pipe sections to close the flow passage, and a linear drive device that moves the valve body to seat it on the valve seat. In this emergency release structure, with the open ends of the pair of pipe sections abutting each other, the flow passage is closed by the valve body via the linear drive device. This emergency release structure allows the pair of pipe sections to be separated with the flow passage closed.
[0003] Japanese Unexamined Patent Application Publication No. 2023-5594
[0004] In the emergency release structure disclosed in Japanese Unexamined Patent Application Publication No. 2023-5594, the flow passage is closed in a state where the open ends of the pair of pipe sections abut each other. In this emergency release structure, in the state where the open ends abut each other, the valve bodies that seat on the valve seats are configured so as not to interfere with each other. For this reason, when the open ends are in an abutting state, a space is formed between the valve bodies that have closed the flow passage. The pressure in this space is likely to rise when the pair of valve bodies close the flow passage.
[0005] It is an object of the present application to provide an emergency release structure that suppresses a pressure rise in the space formed between the valve bodies that have closed the flow passage.
[0006] The emergency release structure disclosed herein is an emergency release structure for a fluid handling device that transports fluids, comprising: a first housing having a flow path, an open end face having an opening for the flow path, and a valve seat located within the flow path; a first valve body located within the flow path of the first housing and in contact with the valve seat of the first housing to close the opening for the flow path of the first housing; a second housing having a flow path, an open end face having an opening for the flow path, and a valve seat located within the flow path; a second valve body located within the flow path of the second housing and in contact with the valve seat of the second housing to close the opening for the flow path of the second housing; a clamp connecting the first housing and the second housing so that they can be separated when the open end face of the first housing and the open end face of the second housing are abutted together and the flow path of the first housing and the flow path of the second housing are connected; The device includes a safety valve that, with the flow path of the first housing and the flow path of the second housing connected, causes the first valve body to contact the valve seat of the first housing and the second valve body to contact the valve seat of the second housing, thereby reducing the pressure in the space to a predetermined pressure or less.
[0007] This emergency release structure can suppress the pressure increase in the space between valve bodies that have closed the flow path.
[0008] Figure 1 is an explanatory diagram showing a fluid handling device equipped with an emergency release structure according to one embodiment. Figure 2 is an explanatory diagram showing the emergency release structure of Figure 1 in use with the flow path open. Figure 3 is a partially enlarged explanatory diagram showing the emergency release structure of Figure 1 in use with the flow path closed. Figure 4A is a partially enlarged view of the safety valve in use in Figure 3, and Figure 4B is a partially enlarged view of the safety valve in use in Figure 3, with the safety valve open. Figure 5 is an explanatory diagram showing the emergency release structure of Figure 1 in use when it has been detached. Figure 6 is a partially enlarged cross-sectional view showing a part of an emergency release structure according to another embodiment.
[0009] Preferred embodiments will be described in detail below, with reference to drawings as appropriate.
[0010] Figure 1 shows a fluid handling device 1. The fluid handling device 1 is a device for transporting fluids, for example, between a tanker and a land-based facility. The fluid to be transported is, for example, liquefied hydrogen. The fluid to be transported is not particularly limited and may be LNG, liquefied ethylene, or a gas such as hydrogen gas.
[0011] The fluid handling device 1 comprises an emergency release structure 2, a joint 3 connected to one side of the emergency release structure 2, a movable pipe 4 connected to the other side of the emergency release structure 2, an arm 5 supporting the movable pipe 4, and a support column 6 supporting the arm 5. The joint 3 is connected to a ship such as a tanker. The movable pipe 4 extends along the arm 5 and the support column 6 and is connected to a land-based facility. The arm 5 is rotatable horizontally relative to the support column 6 and tiltable vertically relative to the support column 6. The emergency release structure 2 is attached to the arm 5, is rotatable relative to the arm 5, and can be moved to various positions by the arm 5.
[0012] Figure 2 shows a cross-section of the emergency release structure 2. The emergency release structure 2 comprises a first housing 7 connected to a joint 3 and a first valve body 8 located inside the first housing 7. The emergency release structure 2 also comprises a second housing 9 connected to a movable pipe 4 and a second valve body 10 located inside the second housing 9. Furthermore, the emergency release structure 2 comprises a first driver 11 for moving the first valve body 8 and a second driver 12 for moving the second valve body 10. The emergency release structure 2 includes a clamp 13 connecting the first housing 7 and the second housing 9. The emergency release structure 2 includes a safety valve 14 attached to the second valve body 10. In this emergency release structure 2, the first housing 7 is located below the second housing 9 in the vertical direction. The second housing 9 is rotatably mounted on the arm 5 of the fluid handling device 1.
[0013] The first drive unit 11 and the second drive unit 12 illustrated in Figure 2 are hydraulic drive units. This emergency release structure 2 includes a hydraulic circuit that operates the first drive unit 11 and the second drive unit 12. This hydraulic circuit has hydraulic equipment. The emergency release structure 2 includes a controller that controls the hydraulic equipment. The controller operates the hydraulic equipment of the hydraulic circuit, making the first drive unit 11 and the second drive unit 12 operable. The first drive unit 11 may be any drive unit that moves the first valve body 8, and may be an electric motor and a linear motion structure. Similarly, the second drive unit 12 may be an electric motor and a linear motion structure.
[0014] The first housing 7 has a flow path 7A through which liquid hydrogen flows, an opening 7B of the flow path 7A, an open end face 7C where the opening 7B is formed, and a valve seat 7D located within the flow path 7A. The valve seat 7D is formed within the flow path 7A from the opening 7B. Alternatively, the valve seat 7D may be formed within the flow path 7A away from the opening 7B. The valve seat 7D has a tapered inner surface that narrows from within the flow path 7A towards the opening 7B.
[0015] The first valve body 8 is located within the flow path 7A of the first housing 7. The first valve body 8 has a seat surface 8A, an end surface 8B facing the second valve body 10, and an end surface 8C opposite to the end surface 8B that faces into the flow path 7A. The seat surface 8A is a tapered outer surface that narrows towards the tip end surface 8B.
[0016] The second housing 9 has a flow path 9A through which liquid hydrogen flows, an opening 9B of the flow path 9A, an open end face 9C where the opening 9B is formed, and a valve seat 9D located inside the flow path 9A. The valve seat 9D is formed inside the flow path 9A from the opening 9B. Alternatively, the valve seat 9D may be formed inside the flow path 9A away from the opening 9B. The valve seat 9D has a tapered inner surface that narrows from inside the flow path 9A towards the opening 9B.
[0017] The second valve body 10 is located within the flow path 9A of the second housing 9. The second valve body 10 has a seat surface 10A, an end surface 10B facing the first valve body 8, and an end surface 10C opposite the end surface 10B that faces into the flow path 9A. The seat surface 10A is a tapered outer surface that narrows towards the tip end surface 10B.
[0018] The first drive unit 11 is mounted on the first housing 7. The first drive unit 11 is connected to the first valve body 8. The first drive unit 11 is a drive that moves the first valve body 8 along the flow path 7A. The first drive unit 11 positions the first valve body 8 in an open position away from the valve seat 7D. The second drive unit 12 is mounted on the second housing 9. The second drive unit 12 is connected to the second valve body 10. The second drive unit 12 is a drive that moves the second valve body 10 along the flow path 9A. The second drive unit 12 positions the second valve body 10 in an open position away from the valve seat 9D. In the operating state shown in Figure 2, liquid hydrogen can flow through the flow paths 7A and 9A. The emergency release structure 2 in Figure 2 is in the operating state with the flow paths 7A and 9A open.
[0019] The clamp 13 is attached to the first housing 7 and the second housing 9, connecting the first housing 7 and the second housing 9. The clamp 13 clamps the first housing 7 and the second housing 9 with its open end faces 7C and 9C abutting against each other. The clamp 13 is removable from the first housing 7 and the second housing 9. By removing the clamp 13, the first housing 7 and the second housing 9 can be separated. The clamp 13 is not limited to the clamp 13 shown in Figure 2, as long as it connects the first housing 7 and the second housing 9 in a way that allows them to be separated.
[0020] Figure 3 shows an enlarged cross-sectional view of a part of the emergency release structure 2. Although omitted in Figure 2, as shown in Figure 3, the first housing 7 has a double-tube structure with a vacuum space 7G inside. This first housing 7 has an insulating structure. The second housing 9 also has a double-tube structure with a vacuum space 9G inside. This second housing 9 also has an insulating structure.
[0021] In the operating state shown in Figure 3, the seat surface 8A of the first valve body 8 is in contact with the valve seat 7D. The first valve body 8 is in the closed position due to the first drive unit 11. The seat surface 10A of the second valve body 10 is in contact with the valve seat 9D. The second valve body 10 is in the closed position due to the second drive unit 12. The emergency release structure 2 in Figure 3 is in the operating state with the flow paths 7A and 9A closed.
[0022] In Figure 3, the emergency release structure 2 has the open end face 7C of the first housing 7 and the open end face 9C of the second housing 9 abutting against each other. The first valve body 8 is recessed inward from the open end face 7C of the first housing 7. The second valve body 10 is recessed inward from the open end face 9C of the second housing 9. The first valve body 8 abuts against the valve seat 7D and the second valve body 10 abuts against the valve seat 9D, creating a space 20 between the end face 8B of the first valve body 8 and the end face 10B of the second valve body 10. This space 20 is partitioned and sealed by the first valve body 8 and the second valve body 10. In this emergency release structure 2, the other operating conditions are the same as those in Figure 2.
[0023] As shown in Figure 3, the safety valve 14 comprises a housing 15, a cover 16 attached to the housing 15, a valve body 17 located inside the housing 15, and a spring 18 that biases the valve body 17. The safety valve 14 is attached to the second valve body 10. The second valve body 10 has a through hole 10D that penetrates from end face 10B to end face 10C. In this safety valve 14, the housing 15 is embedded in the through hole 10D. Note that the mounting structure of the safety valve 14 is illustrative and not limited to the mounting structure shown in Figure 3. For example, the housing 15 of the safety valve 14 may be formed in the second valve body 10 as part of the through hole 10D of the second valve body 10.
[0024] Figure 4A shows an enlarged view of the safety valve 14 in Figure 3. The housing 15 of the safety valve 14 has a flow path 15A located between the end faces 10B and 10C of the second valve body 10, an inlet opening 15B of the flow path 15A, an outlet opening 15C of the flow path 15A, and a valve seat 15D located inside the flow path 15A. The valve seat 15D has a tapered inner surface that narrows from inside the flow path 15A towards the inlet opening 15B.
[0025] The cover 16 of the safety valve 14 faces the valve seat 15D. The valve body 17 of the safety valve 14 is located within the passage 15A of the safety valve 14. The valve body 17 is spherical in shape and has a seat surface 17A that contacts the valve seat 15D of the housing 15. The spring 18 is located between the cover 16 and the valve body 17. The spring 18 is supported by the cover 16 and biases the valve body 17 toward the valve seat 15D of the housing 15. The spring 18 causes the valve body 17 to contact the valve seat 15D. In the operating state shown in Figure 4A, the passage 15A of the housing 15 is closed. Note that the spring 18 may be any biasing device that biases the valve body 17 toward the valve seat 15D, and may be other elastic bodies or biasing devices such as air cylinders.
[0026] Figure 4B shows the safety valve 14 in operation with the passage 15A of the housing 15 open. In Figure 4B, the valve body 17 is separated from the valve seat 15D against the biasing force of the spring 18. The passage 15A of the housing 15 connects the end face 10B and the end face 10C.
[0027] Figure 5 further shows other usage states of the emergency release structure 2. In Figure 5, the clamp 13 is removed. The first housing 7 and the second housing 9 are separated. The first housing 7 is located below the second housing 9, and the second housing 9 is separated above the first housing 7.
[0028] In Figure 5, the first drive unit 11 is positioned in a closed position with the first valve body 8 in contact with the valve seat 7D. The seat surface 8A of the first valve body 8 is in contact with the valve seat 7D of the first housing 7. The first valve body 8 is blocking the opening 7B of the flow path 7A. The second drive unit 12 is positioned in a closed position with the second valve body 10 in contact with the valve seat 9D. The seat surface 10A of the second valve body 10 is in contact with the valve seat 9D of the second housing 9. The second valve body 10 is blocking the opening 9B of the flow path 9A. In Figure 5, the flow paths 7A and 9A are both blocked.
[0029] In the use of the fluid handling device 1 shown in Figure 1, for example, the movable piping 4 is connected to the land facility. The fluid handling device 1 moves the joint 3 to a position where it is connected to the joint connection of the tanker. The joint 3 is connected to the joint connection of the tanker. The emergency release structure 2 is in the operating state shown in Figure 2. Under normal circumstances, liquefied hydrogen is transported between the land facility and the tanker. In this emergency release structure 2, with the flow path 7A of the first housing 7 and the flow path 9A of the second housing 9 connected, the first valve body 8 is movable between a position away from the valve seat 7D and a position in contact with the valve seat 7D. Similarly, the second valve body 10 is movable between a position away from the valve seat 9D and a position in contact with the valve seat 9D.
[0030] On the other hand, strong winds or high waves may cause the land-based facility and the tanker to move beyond a predetermined distance. In such emergencies, the first drive unit 11 moves the first valve body 8 toward the valve seat 7D from the operating state shown in Figure 2. The second drive unit 12 moves the second valve body 10 toward the valve seat 9D from the operating state shown in Figure 2. The first valve body 8 comes into contact with the valve seat 7D, and the second valve body 10 comes into contact with the valve seat 9D. In this way, the emergency release structure 2 is returned to the operating state shown in Figure 3.
[0031] As shown in Figure 3, in the emergency release structure 2, with the open end face 7C of the first housing 7 and the open end face 9C of the second housing 9 abutting together, the first valve body 8 contacts the valve seat 7D, and the second valve body 10 contacts the valve seat 9D. From the operating state shown in Figure 3, the clamp 13 is removed. The second housing 9, which is attached to the arm 5, moves to a position away from the first housing 7 due to the tilting of the arm 5. In this way, the emergency release structure 2 is brought to the operating state shown in Figure 5.
[0032] As shown in Figure 3, in the emergency release structure 2, with the first housing 7 and the second housing 9 connected, the first valve body 8 contacts the valve seat 7D of the first housing 7, and the second valve body 10 contacts the valve seat 9D of the second housing 9. The emergency release structure 2 can close the flow paths 7A and 9A before separating the first housing 7 and the second housing 9. This emergency release structure 2 can reduce the amount of liquefied hydrogen leaked when separating the first housing 7 and the second housing 9.
[0033] Furthermore, the emergency release structure 2 includes a first housing 7 and a second housing 9 with a double-pipe structure. The first housing 7 and the second housing 9 have an insulating structure. The first housing 7 and the second housing 9 are suitable for transporting liquefied hydrogen at low temperatures.
[0034] The emergency release structure 2 includes a safety valve 14. In the safety valve 14, the valve body 17 contacts and seals against the valve seat 15D of the housing 15, closing the passage 15A. The safety valve 14 prevents liquid hydrogen from leaking from the passage 9A through the passage 15A. The safety valve 14 maintains the pressure of the liquid hydrogen in the passage 9A. On the other hand, with the passage 7A of the first housing 7 and the passage 9A of the second housing 9 connected, the safety valve 14 can release liquid hydrogen from the space 20 to the passage 9A when the pressure in the space 20 exceeds a predetermined pressure. The safety valve 14 can keep the pressure of the liquefied hydrogen in the space 20 below a predetermined pressure. The emergency release structure 2 can suppress the pressure rise of liquefied hydrogen in the space 20 that occurs between the first valve body 8 which closes the passage 7A and the second valve body 10 which closes the passage 9A.
[0035] The safety valve 14 releases liquefied hydrogen from the space 20 to the flow path 9A via the second valve body 10 when the pressure of liquefied hydrogen in the space 20 rises. This emergency release structure 2 can suppress the pressure rise in the space 20 with a simple structure by attaching the safety valve 14 to the second valve body 10. Therefore, it is preferable that the emergency release structure 2 has a through hole 10D in the second valve body 10 that connects the space 20 and the inlet opening 15B of the safety valve 14.
[0036] Furthermore, the safety valve 14 releases liquefied hydrogen into the flow path 9A through its outlet opening 15C. The emergency release structure 2 has a simple structure that can suppress pressure rise while preventing liquefied hydrogen from leaking into the outside air. Therefore, it is preferable that the outlet opening 15C of the safety valve 14 is located within the flow path 9A of the second housing 9.
[0037] The emergency release structure 2 may also include a safety valve 14 attached to the first valve body 8. The first valve body 8 may have a through hole connecting the space 20 and the inlet opening 15B of the safety valve 14. The outlet opening 15C of the safety valve 14 may be located within the flow path 7A of the first housing 7.
[0038] In this emergency release structure 2, the first valve body 8 and the first housing 7 seal the passage 7A by bringing the seat surface 8A on the tapered outer surface into contact with the valve seat 7D on the tapered inner surface. The first valve body 8 and the first housing 7 are illustrative examples, and the shape of the seat surface 8A and the shape of the valve seat 7D are not particularly limited, as long as they can seal the passage 7A. Similarly, the shape of the seat surface 10A of the second valve body 10 and the shape of the valve seat 9D of the second housing 9 are not particularly limited, as long as they can seal the passage 9A.
[0039] Furthermore, the safety valve 14 may release hydrogen gas that has vaporized from the liquefied hydrogen, or it may release hydrogen gas together with the liquefied hydrogen. Also, the safety valve 14 only needs to be able to keep the pressure of the liquid hydrogen in the space 20 below a predetermined pressure. The safety valve 14 is not limited to being attached to the first valve body 8 or the second valve body 10. For example, the safety valve 14 may be attached to the first housing 7 or the second housing 9.
[0040] Figure 6 shows a part of the emergency escape structure 22 according to another embodiment. Here, the configuration of the emergency escape structure 22 that differs from that of the emergency escape structure 2 will be described. The same configuration as that of the emergency escape structure 2 will not be described and will be described using the same reference numerals.
[0041] The emergency release structure 22 comprises a second housing 23 connected to the movable piping 4 and a second valve body 24 located inside the second housing 23. Furthermore, the emergency release structure 22 includes a safety valve 25 attached to the second housing 23. In the vertical direction, the first housing 7 is located below the second housing 23. The second housing 23 is rotatably attached to the arm 5 of the fluid handling device 1.
[0042] In the emergency release structure 22, the open end face 7C of the first housing 7 and the open end face 23C of the second housing 23 are abutted together. The flow path 7A of the first housing 7 and the flow path 23A of the second housing 23 are connected. The first valve body 8 abuts against the valve seat 7D and the second valve body 24 abuts against the valve seat 23D. As a result, a space 26 is created between the end face 8B of the first valve body 8 and the end face 24B of the second valve body 24. This space 26 is partitioned and sealed by the first valve body 8 and the second valve body 24.
[0043] The emergency release structure 22 further comprises a vent pipe 28 connected to the safety valve 25 for discharging liquid hydrogen, and a processor 29 connected to the vent pipe 28. The vent pipe 28 connects the outlet opening 30C of the housing 30 and the processor 29. Note that the processor 29 is not limited to a device that processes discharged liquid hydrogen. The processor 29 may be a tank that temporarily stores liquid hydrogen.
[0044] The safety valve 25 comprises a housing 30, a cover 31 attached to the housing 30, a valve body 17 positioned within the housing 30, and a spring 18 that biases the valve body 17. The housing 30 of the safety valve 25 has a flow passage 30A, an inlet opening 30B of the flow passage 30A, an outlet opening 30C of the flow passage 30A, and a valve seat 30D positioned within the flow passage 30A. The valve seat 30D is a tapered inner circumferential surface that tapers from the inside of the flow passage 30A toward the inlet opening 30B.
[0045] The cover 31 of the safety valve 25 faces the valve seat 30D. The valve body 17 of the safety valve 25 is positioned within the flow passage 30A of the housing 30. The valve body 17 has a seat surface 17A that abuts against the valve seat 30D of the housing 30. The spring 18 is positioned between the cover 31 and the valve body 17. The spring 18 is supported by the cover 31 and biases the valve body 17 toward the valve seat 30D of the housing 30. The valve body 17 is held in abutment against the valve seat 30D by the spring 18. In the use state shown in Fig. 6, the flow passage 30A of the housing 30 is closed.
[0046] The second housing 23 has a pipe 27 connecting the space 26 and the safety valve 25. Note that the pipe 27 is an example of a ventilation structure that connects the space 26 and the inlet opening 30B of the housing 30. The ventilation structure only needs to connect the space 26 and the inlet opening 30B of the housing 30, and may be a hole formed in the second housing 23 and a pipe connected to the hole.
[0047] When the pressure of liquid hydrogen in the space 26 rises, the safety valve 25 releases liquid hydrogen from the space 26 to the vent pipe 28 via the pipe 27. This emergency release structure 22 can suppress pressure increase in the space 26. Note that the safety valve 25 may be attached to the first housing 7.
[0048] The emergency release structure 22 is connected to a vent pipe 28, thereby enabling suppression of a pressure increase in the space 26 while suppressing release of liquid hydrogen to the atmosphere. Note that the safety valve 14 attached to the second valve body 10 of the aforementioned emergency release structure 2 may be connected to the vent pipe 28.
[0049] Furthermore, the safety valve 25 is not limited to one that releases the liquid hydrogen in the space 26 to the vent pipe 28. The safety valve 25 may discharge the fluid in the space 26 to the atmosphere.
[0050] [Disclosure Items] Each of the following items discloses preferred embodiments.
[0051] [Item 1] An emergency release structure for a fluid cargo handling apparatus that transports fluid, comprising: a first housing having a flow path, an opening end face formed with an opening of the flow path, and a valve seat located within the flow path; a first valve body located in the flow path of the first housing, the first valve body abutting against the valve seat of the first housing to close the opening of the flow path of the first housing; a second housing having a flow path, an opening end face formed with an opening of the flow path, and a valve seat located within the flow path; a second valve body located in the flow path of the second housing, the second valve body abutting against the valve seat of the second housing to close the opening of the flow path of the second housing; a clamp that detachably connects the first housing and the second housing in a state where the opening end face of the first housing and the opening end face of the second housing are butted against each other and the flow path of the first housing and the flow path of the second housing are connected to each other; and a safety valve that reduces the pressure of a space generated when the first valve body abuts against the valve seat of the first housing and the second valve body abuts against the valve seat of the second housing in a state where the flow path of the first housing and the flow path of the second housing are connected to a predetermined pressure or lower, wherein the emergency release structure is for a fluid cargo handling apparatus.
[0052] According to the configuration of Item 1, a pressure increase in the space generated between the first valve body and the second valve body can be suppressed.
[0053] [Item 2] The emergency release structure for a fluid cargo handling apparatus according to Item 1, wherein the first valve body or the second valve body has a through hole that connects the space and an inlet opening of the safety valve.
[0054] According to the configuration of item 2, the emergency release structure can suppress the pressure rise in the space between the first valve body and the second valve body.
[0055] [Item 3] An emergency release structure for a fluid handling device according to Item 2, wherein the outlet opening of the safety valve is located within the flow path of the first housing or the flow path of the second housing.
[0056] According to the configuration of item 3, the emergency release structure can suppress the pressure rise in space with a simple structure.
[0057] [Item 4] An emergency release structure for a fluid handling device according to Item 1, wherein the first housing or the second housing has a ventilation structure that connects the space and the inlet opening of the safety valve.
[0058] According to the configuration of item 4, the emergency release structure can suppress the pressure rise in the space between the first valve body and the second valve body.
[0059] [Item 5] An emergency release structure for a fluid handling device according to any one of Items 1 to 4, wherein the outlet opening of the safety valve is connected to a vent pipe.
[0060] According to the configuration of item 5, it is possible to suppress the release of fluid into the atmosphere while suppressing the rise in pressure in the space.
[0061] 1... Fluid handling device 2, 22... Emergency release structure 7... First housing 7A, 9A... Flow path 7B, 9B... Opening 7C, 9C, 23C... Opening end face 7D, 9D, 23D... Valve seat 8... First valve body 9, 23... Second housing 10, 24... Second valve body 10D... Through hole 11... First drive 12... Second drive 13... Clamp 14, 25... Safety valve 20, 26... Space 27... Piping 28... Vent piping 15B, 30B... Inlet opening 15C, 30C... Outlet opening
Claims
1. An emergency release structure for a fluid handling device that transports fluids, comprising: a first housing having a flow path, an open end face with an opening for the flow path formed therein, and a valve seat located within the flow path; a first valve body located within the flow path of the first housing and in contact with the valve seat of the first housing to close the opening for the flow path of the first housing; a second housing having a flow path, an open end face with an opening for the flow path formed therein, and a valve seat located within the flow path; a second valve body located within the flow path of the second housing and in contact with the valve seat of the second housing to close the opening for the flow path of the second housing; and a clamp connecting the first housing and the second housing so that they can be separated when the open end face of the first housing and the open end face of the second housing are abutted together and the flow path of the first housing and the flow path of the second housing are connected, and An emergency release structure for a fluid handling device, comprising a safety valve that reduces the pressure in the space created when the first valve body contacts the valve seat of the first housing and the second valve body contacts the valve seat of the second housing while the flow path of the first housing and the flow path of the second housing are connected, to a predetermined pressure or less.
2. The emergency release structure for a fluid handling device according to claim 1, wherein the first valve body or the second valve body has a through hole connecting the space and the inlet opening of the safety valve.
3. The emergency release structure for a fluid handling device according to claim 2, wherein the outlet opening of the safety valve is located within the flow path of the first housing or the flow path of the second housing.
4. The emergency release structure for a fluid handling device according to claim 1, wherein the first housing or the second housing has a ventilation structure that connects the space and the inlet opening of the safety valve.
5. An emergency release structure for a fluid handling device according to any one of claims 1 to 4, wherein the outlet opening of the safety valve is connected to a vent pipe.