Rotary inflation device suitable for winding IV-type hydrogen storage bottle inner container and use method of rotary inflation device

Abstract

The invention discloses a rotary inflation device suitable for winding of an IV-type hydrogen storage bottle inner container and a using method thereof.The rotary inflation device comprises a tail winding shaft, the tail winding shaft is arranged at the tail of the IV-type hydrogen storage bottle inner container, and a mouth winding shaft is arranged at the mouth of the IV-type hydrogen storage bottle inner container; the rotating joint assembly is connected and communicated with the mouth winding shaft, one end of the inflation pipeline assembly is connected and communicated with the rotating joint assembly, and the other end of the inflation pipeline assembly is connected with a nitrogen cylinder. The IV-type hydrogen storage cylinder inner container is prevented from buckling collapse under the action of fiber tension, normal operation and safety of winding of the IV-type hydrogen storage cylinder inner container are guaranteed, and pressure monitoring, pressure adjusting and pressure relief operation can be conducted on a high-pressure inflation pipeline when the IV-type hydrogen storage cylinder inner container is wound and solidified. And the use safety during winding and curing of the IV-type hydrogen storage bottle liner is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of composite gas cylinder winding, and specifically relates to a rotary inflator suitable for winding the inner liner of a type IV hydrogen storage bottle and a use method thereof. Background Art

[0002] Hydrogen storage technology is a key technology in the development of hydrogen energy. Type IV hydrogen storage cylinder plastic has the characteristics of light weight and fatigue resistance, making it a research hotspot around the world. During the winding process of Type IV cylinders, the tension of the fibers will cause the plastic liner to buckle and collapse, affecting the winding and performance of the liner. Therefore, it is necessary to pressurize the inside of the plastic liner to eliminate the problem of buckling and collapse of the liner.

[0003] Traditional Type IV bottles require a special Type IV bottle wrapping machine with an axial channel inside the clamping device to inflate the liner in the axial direction. However, ordinary wrapping machine clamping devices do not have an axial channel inside. If Type IV bottles are to be wrapped, the wrapping machine needs to be modified, which is time-consuming and labor-intensive and inconvenient for production and use. For this reason, we propose a rotating inflation device suitable for winding the inner liner of Type IV hydrogen storage bottles and a method for using the same. Summary of the invention

[0004] The purpose of the present invention is to provide a rotating inflation device suitable for winding the inner liner of a Type IV hydrogen storage bottle and a method of using the same, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a rotary inflator suitable for winding the inner liner of a type IV hydrogen storage bottle, comprising: A tail winding shaft, wherein the tail winding shaft is arranged at the tail of the inner liner of the type IV hydrogen storage bottle; A mouth winding shaft, wherein the mouth winding shaft is arranged at the mouth of the inner liner of the type IV hydrogen storage bottle; A rotary joint assembly, the rotary joint assembly is connected and communicated with the mouth winding shaft; An air charging pipeline assembly, one end of which is connected to and communicated with the rotary joint assembly, and the other end of which is connected to a nitrogen bottle.

[0006] Preferably, the tail winding shaft is connected to the tail of the inner liner of the type IV hydrogen storage bottle by means of threads, and the connection between the tail winding shaft and the inner liner of the type IV hydrogen storage bottle is sealed by means of a sealing ring; The tail winding shaft is a solid structure.

[0007] Preferably, the mouth winding shaft is connected to the mouth of the inner liner of the type IV hydrogen storage bottle by means of threads, and the connection between the mouth winding shaft and the inner liner of the type IV hydrogen storage bottle is sealed by means of a sealing ring.

[0008] Preferably, a through hole is provided inside the mouth winding shaft.

[0009] Preferably, the rotary joint assembly comprises a joint body and a joint shell; The joint body and the joint shell are connected at both ends by bearings, and the joint body and the joint shell rotate relative to each other through the bearings, and limit buckles are provided on the outside of both ends of the connection between the joint body and the joint shell; The joint body and the joint housing are sealed and connected via a plurality of sealing rings; An L-shaped hole is provided in the joint body, and the L-shaped hole on the joint body is connected to the through hole on the mouth winding shaft; The joint housing is provided with an air filling hole which is in communication with the L-shaped hole, and the air delivery end of the air filling pipeline assembly is connected with the air filling hole.

[0010] Preferably, flanges are provided at the facing ends of the mouth winding shaft and the joint body, the two flanges are fixedly connected by bolts and nuts, and the connection between the two flanges is sealed by a sealing gasket.

[0011] Preferably, the inflation pipeline assembly includes a stop valve, a pressure gauge, a pressure relief valve, a low-pressure pressure reducing valve, a one-way valve and a high-pressure pressure reducing valve; The stop valve, the pressure gauge, the pressure relief valve, the low-pressure pressure reducing valve, the one-way valve and the high-pressure pressure reducing valve are sequentially connected and communicated through a high-pressure connecting pipe.

[0012] Preferably, the pressure gauge and the pressure relief valve are connected to the high-pressure connecting pipe via a tee; The stop valve, the low-pressure pressure reducing valve, the one-way valve, the high-pressure pressure reducing valve and the tee are all connected to the high-pressure connecting pipe through thread matching.

[0013] Preferably, one end of the stop valve is connected and communicated with the inflation hole on the joint housing through a thread; One end of the high-pressure pressure reducing valve is threadedly connected to the nitrogen bottle.

[0014] A method for using a rotary gas-filling device for winding a type IV hydrogen storage bottle liner comprises the following steps: A: When in use, install the tail winding shaft and the mouth winding shaft at the tail and mouth of the type IV hydrogen storage bottle liner respectively, then install the type IV hydrogen storage bottle liner on the winding machine through the tail winding shaft and the mouth winding shaft, and then connect the mouth winding shaft to the inflation pipeline assembly through the rotary joint assembly; B: Then the winding machine starts to wind the inner liner of the type IV hydrogen storage bottle. At this time, the inner liner of the type IV hydrogen storage bottle rotates, and the joint body and the joint shell on the rotary joint assembly rotate relative to each other through the bearing, so that the inner liner of the type IV hydrogen storage bottle can be wound normally; C: When it is necessary to inflate the inner tank of the Type IV hydrogen storage bottle, close the pressure relief valve, open the stop valve and the high-pressure reducing valve, adjust the pressure to the maximum pressure value required by the inner tank of the Type IV hydrogen storage bottle, then adjust the low-pressure reducing valve, observe the value of the pressure gauge, and further adjust the actual pressure required by the inner tank of the Type IV hydrogen storage bottle; D: When winding is completed, close the high-pressure reducing valve and the stop valve, open the pressure relief valve, and after the pressure gauge shows no pressure, remove the inner liner of the Type IV hydrogen storage bottle and move the inner liner of the Type IV hydrogen storage bottle to the curing furnace for curing; E: After the Type IV hydrogen storage bottle liner is installed in the curing furnace, reconnect the Type IV hydrogen storage bottle liner to the inflation pipeline assembly, close the pressure relief valve, open the stop valve, and monitor the internal pressure value of the Type IV hydrogen storage bottle liner during the winding process through the pressure gauge to ensure the normal operation of the Type IV hydrogen storage bottle liner curing. After the curing is completed, close the stop valve, open the pressure relief valve, and remove the Type IV hydrogen storage bottle liner after the pressure gauge shows no pressure.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is provided with a rotary joint assembly and an air filling pipeline assembly, which can be inflated when the inner liner of the type IV hydrogen storage bottle is wound, so as to prevent the inner liner of the type IV hydrogen storage bottle from buckling and collapsing under the action of fiber tension, thereby ensuring the normal operation and safety of the winding of the inner liner of the type IV hydrogen storage bottle, and can withstand a high temperature of 180°C and a maximum rotation speed of 180rpm; 2. The present invention is provided with a rotating joint assembly. When the inner liner of the type IV hydrogen storage bottle is wound, the joint body and the joint shell rotate relative to each other through the bearing, so as to ensure that when the inner liner of the type IV hydrogen storage bottle is wound normally, the inflation pipeline assembly does not rotate with it, so as to avoid winding and ensure the normal use of the inflation device; 3. The present invention uses a rotary joint assembly to connect and inflate from the side of the inner liner of the type IV hydrogen storage bottle, which can be directly applied to a wrapping machine and a curing furnace that cannot inflate the inner liner of the type IV hydrogen storage bottle. The operation is simple, and there is no need to improve the existing wrapping machine, thereby reducing production costs; 4. The present invention is provided with a stop valve, a pressure gauge, a pressure relief valve, a low-pressure reducing valve, a one-way valve and a high-pressure reducing valve, which can perform pressure monitoring, pressure regulation and pressure relief operations on the high-pressure inflation pipeline when the inner liner of the Type IV hydrogen storage bottle is wound and cured, thereby ensuring the safety of use of the inner liner of the Type IV hydrogen storage bottle during winding and curing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of the main structure of the inner liner of the IV-type hydrogen storage bottle, the tail winding shaft, the mouth winding shaft and the rotating joint assembly of the present invention; Figure 4 It is a schematic cross-sectional structural diagram of the rotary joint assembly of the present invention.

[0017] In the figure: 1. Tail winding shaft; 2. Mouth winding shaft; 3. Rotary joint assembly; 301. Joint body; 302. Joint shell; 303. Bearing; 304. L-shaped hole; 305. Inflating hole; 4. Inflating pipeline assembly; 401. Stop valve; 402. Pressure gauge; 403. Pressure relief valve; 404. Low-pressure reducing valve; 405. Check valve; 406. High-pressure reducing valve; 407. High-pressure connecting pipe; 408. Tee; 5. Type IV hydrogen storage bottle liner; 6. Nitrogen bottle. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 4 The rotary gas filling device provided by the present invention is suitable for winding the inner liner of a type IV hydrogen storage bottle, comprising: The tail winding shaft 1 is arranged at the tail of the type IV hydrogen storage bottle liner 5, and the tail winding shaft 1 is connected to the tail of the type IV hydrogen storage bottle liner 5 by threads, and the connection between the tail winding shaft 1 and the type IV hydrogen storage bottle liner 5 is sealed by a sealing ring; the tail winding shaft 1 is a solid structure, which plays the role of a plug; The mouth winding shaft 2 is arranged at the mouth of the IV-type hydrogen storage bottle liner 5, the mouth winding shaft 2 is connected to the mouth of the IV-type hydrogen storage bottle liner 5 by threads, and the connection between the mouth winding shaft 2 and the IV-type hydrogen storage bottle liner 5 is sealed by a sealing ring, and a through hole is opened inside the mouth winding shaft 2; The rotary joint assembly 3 is connected and communicated with the mouth winding shaft 2. The rotary joint assembly 3 includes a joint body 301 and a joint shell 302. The joint body 301 and the joint shell 302 are connected at both ends by bearings 303. The joint body 301 and the joint shell 302 rotate relative to each other through the bearings 303. The joint body 301 and the joint shell 302 are provided with limit buckles at both ends of the joint, and the limit buckles prevent the joint body 301 and the joint shell 302 from axial movement. 1 and the joint housing 302 are sealed and connected by a plurality of sealing rings; an L-shaped hole 304 is provided in the joint body 301, and the L-shaped hole 304 on the joint body 301 is connected to the through hole on the nozzle winding shaft 2; an inflation hole 305 is provided on the joint housing 302 and is connected to the L-shaped hole 304, and the gas delivery end of the inflation pipeline assembly 4 is connected to the inflation hole 305, and the nozzle winding shaft 2 and the joint body 301 are both provided with flanges at the opposite ends, and the two flanges are fixedly connected by bolts and nuts, and the connection between the two flanges is sealed by a sealing gasket; The present invention is provided with a rotating joint assembly 3. When the inner liner 5 of the type IV hydrogen storage bottle is wound, the joint body 301 and the joint shell 302 rotate relative to each other through the bearing 303, so as to ensure that when the inner liner 5 of the type IV hydrogen storage bottle is wound normally, the inflation pipeline assembly 4 does not rotate with it, so as to avoid winding and ensure the normal use of the inflation device. In the present invention, the swivel joint assembly 3 is used to connect and inflate from the side of the inner liner 5 of the type IV hydrogen storage bottle, and can be directly applied to a wrapping machine and a curing furnace that cannot inflate the inner liner 5 of the type IV hydrogen storage bottle. The operation is simple, and there is no need to improve the existing wrapping machine, thereby reducing the production cost. The gas filling pipeline assembly 4, one end of which is connected to and communicated with the rotary joint assembly 3, and the other end of the gas filling pipeline assembly 4 is connected to a nitrogen bottle 6, and the gas filling pipeline assembly 4 includes a stop valve 401, a pressure gauge 402, a pressure relief valve 403, a low-pressure pressure reducing valve 404, a one-way valve 405 and a high-pressure pressure reducing valve 406; the stop valve 401, the pressure gauge 402, the pressure relief valve 403, the low-pressure pressure reducing valve 404, the one-way valve 405 and the high-pressure pressure reducing valve 406 are connected in sequence. The high-pressure connecting pipe 407 is connected and communicated, and the pressure gauge 402 and the pressure relief valve 403 are connected to the high-pressure connecting pipe 407 through the tee 408; the stop valve 401, the low-pressure pressure reducing valve 404, the one-way valve 405, the high-pressure pressure reducing valve 406 and the tee 408 are all connected to the high-pressure connecting pipe 407 through matching threads, and one end of the stop valve 401 is connected and communicated with the charging hole 305 on the joint housing 302 through matching threads; one end of the high-pressure pressure reducing valve 406 is threadedly connected to the nitrogen bottle 6; The stop valve 401 is used to control the connection between the rotary joint assembly 3 and the inflation pipeline assembly 4; The pressure gauge 402 is used to detect the pressure in the inflation pipeline assembly 4; The pressure relief valve 403 is used to release the gas pressure in the inflation pipeline assembly 4 to ensure the safety of the inflation pipeline assembly 4; The low-pressure pressure reducing valve 404 is used to meet the pressure requirements when the inner liner 5 of the type IV hydrogen storage bottle is wound, and to adjust the gas pressure in the charging pipeline assembly 4; The one-way valve 405 is used to prevent gas backflow; The high-pressure pressure reducing valve 406 is used to adjust and reduce the output gas pressure of the nitrogen bottle 6 to ensure the safe use of the gas filling pipeline assembly 4 and the type IV hydrogen storage bottle liner 5; The present invention is provided with a stop valve 401, a pressure gauge 402, a pressure relief valve 403, a low-pressure reducing valve 404, a one-way valve 405 and a high-pressure reducing valve 406, which can perform pressure monitoring, pressure regulation and pressure relief operations on the high-pressure inflation pipeline when the inner liner 5 of the type IV hydrogen storage bottle is wound and cured, thereby ensuring the safety of use of the inner liner 5 of the type IV hydrogen storage bottle when it is wound and cured.

[0020] The present invention is provided with a rotating joint assembly 3 and an inflation pipeline assembly 4, which can be inflated when the type IV hydrogen storage bottle liner 5 is wound, preventing the type IV hydrogen storage bottle liner 5 from buckling and collapsing under the action of fiber tension, ensuring the normal operation and safety of the winding of the type IV hydrogen storage bottle liner 5, and can withstand a high temperature of 180°C and a maximum rotation speed of 180rpm.

[0021] The method for using the rotary gas-filling device provided by the present invention, which is suitable for winding the inner liner of a type IV hydrogen storage bottle, comprises the following steps: A: When in use, the tail winding shaft 1 and the mouth winding shaft 2 are respectively installed on the tail and mouth of the IV type hydrogen storage bottle liner 5, and then the IV type hydrogen storage bottle liner 5 is installed on the winding machine through the tail winding shaft 1 and the mouth winding shaft 2, and then the mouth winding shaft 2 is connected to the inflation pipeline assembly 4 through the rotary joint assembly 3; B: Then the winding machine starts to wind the inner liner 5 of the type IV hydrogen storage bottle. At this time, the inner liner 5 of the type IV hydrogen storage bottle rotates, and the joint body 301 and the joint shell 302 on the rotary joint assembly 3 rotate relative to each other through the bearing 303, so that the inner liner 5 of the type IV hydrogen storage bottle can be wound normally; C: When it is necessary to inflate the inner liner 5 of the type IV hydrogen storage bottle, close the pressure relief valve 403, open the stop valve 401 and the high-pressure pressure reducing valve 406, adjust the pressure to the maximum pressure value required by the inner liner 5 of the type IV hydrogen storage bottle, then adjust the low-pressure pressure reducing valve 404, observe the value of the pressure gauge 402, and further adjust the actual pressure required by the inner liner 5 of the type IV hydrogen storage bottle; D: After the winding is completed, close the high pressure reducing valve 406 and the stop valve 401, open the pressure relief valve 403, and after the pressure gauge 402 shows no pressure, remove the IV type hydrogen storage bottle liner 5, and carry the IV type hydrogen storage bottle liner 5 to the curing furnace for curing; E: After the type IV hydrogen storage bottle liner 5 is installed in the curing furnace, reconnect the type IV hydrogen storage bottle liner 5 to the inflation pipeline assembly 4, close the pressure relief valve 403, open the stop valve 401, and monitor the internal pressure value of the type IV hydrogen storage bottle liner 5 during the winding process through the pressure gauge 402 to ensure the normal operation of the curing of the type IV hydrogen storage bottle liner 5. After the curing is completed, close the stop valve 401, open the pressure relief valve 403, and after the pressure gauge 402 shows no pressure, remove the type IV hydrogen storage bottle liner 5.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary inflator suitable for winding the inner liner of a Type IV hydrogen storage bottle. It is characterized in that include: A tail winding shaft (1), wherein the tail winding shaft (1) is arranged at the tail of the inner liner (5) of the type IV hydrogen storage bottle; A mouth winding shaft (2), wherein the mouth winding shaft (2) is arranged at the mouth of the inner liner (5) of the type IV hydrogen storage bottle; A rotary joint assembly (3), the rotary joint assembly (3) being connected to and in communication with the mouth winding shaft (2); An air charging pipeline assembly (4), one end of the air charging pipeline assembly (4) being connected to and in communication with the rotary joint assembly (3), and the other end of the air charging pipeline assembly (4) being connected to a nitrogen bottle (6).

2. A rotary gas filling device suitable for winding the inner liner of a type IV hydrogen storage bottle according to claim 1, Features: The tail winding shaft (1) is connected to the tail of the type IV hydrogen storage bottle liner (5) via a thread, and the connection between the tail winding shaft (1) and the type IV hydrogen storage bottle liner (5) is sealed via a sealing ring; The tail winding shaft (1) is a solid structure.

3. A rotary gas filling device suitable for winding the inner liner of a type IV hydrogen storage bottle according to claim 1, Features: The mouth winding shaft (2) is connected to the mouth of the type IV hydrogen storage bottle liner (5) via a thread, and the connection between the mouth winding shaft (2) and the type IV hydrogen storage bottle liner (5) is sealed via a sealing ring.

4. A rotary gas filling device suitable for winding the inner liner of a type IV hydrogen storage bottle according to claim 3, Features: A through hole is provided inside the mouth winding shaft (2).

5. A rotary gas filling device suitable for winding the inner liner of a type IV hydrogen storage bottle according to claim 4, Features: The rotary joint assembly (3) comprises a joint body (301) and a joint shell (302); The joint body (301) and the joint shell (302) are connected at both ends via bearings (303), the joint body (301) and the joint shell (302) are relatively rotatable via the bearings (303), and limit buckle rings are provided on the outside of both ends of the connection between the joint body (301) and the joint shell (302); The joint body (301) and the joint housing (302) are sealed and connected via a plurality of sealing rings; An L-shaped hole (304) is provided in the joint body (301), and the L-shaped hole (304) on the joint body (301) is connected to a through hole on the mouth winding shaft (2); The joint housing (302) is provided with an air filling hole (305) which is in communication with the L-shaped hole (304); the air delivery end of the air filling pipeline assembly (4) is connected to the air filling hole (305).

6. A rotary gas filling device suitable for winding the inner liner of a type IV hydrogen storage bottle according to claim 5, Features: The mouth winding shaft (2) and the joint body (301) are both provided with flanges at the facing ends thereof, the two flanges are fixedly connected by bolts and nuts, and the connection between the two flanges is sealed by a sealing gasket.

7. A rotary gas filling device suitable for winding the inner liner of a type IV hydrogen storage bottle according to claim 6, Features: The inflation pipeline assembly (4) comprises a stop valve (401), a pressure gauge (402), a pressure relief valve (403), a low-pressure pressure reducing valve (404), a one-way valve (405) and a high-pressure pressure reducing valve (406); The stop valve (401), the pressure gauge (402), the pressure relief valve (403), the low-pressure pressure reducing valve (404), the one-way valve (405) and the high-pressure pressure reducing valve (406) are sequentially connected and communicated via a high-pressure connecting pipe (407).

8. A rotary gas filling device suitable for winding the inner liner of a type IV hydrogen storage bottle according to claim 7, Features: The pressure gauge (402) and the pressure relief valve (403) are connected to the high-pressure connecting pipe (407) via a tee (408); The stop valve (401), the low-pressure pressure reducing valve (404), the one-way valve (405), the high-pressure pressure reducing valve (406) and the three-way valve (408) are all connected to the high-pressure connecting pipe (407) via threaded connections.

9. A rotary gas filling device suitable for winding the inner liner of a type IV hydrogen storage bottle according to claim 8, Features: One end of the stop valve (401) is connected and communicated with the inflation hole (305) on the joint housing (302) via a thread; One end of the high-pressure pressure reducing valve (406) is threadedly connected to the nitrogen bottle (6).

10. A method for using a rotary inflator suitable for winding the inner liner of a type IV hydrogen storage bottle according to any one of claims 1 to 9, It is characterized in that The steps include: A: When in use, the tail winding shaft (1) and the mouth winding shaft (2) are respectively installed at the tail and mouth of the type IV hydrogen storage bottle liner (5), and then the type IV hydrogen storage bottle liner (5) is installed on the winding machine through the tail winding shaft (1) and the mouth winding shaft (2), and then the mouth winding shaft (2) is connected to the inflation pipeline assembly (4) through the rotary joint assembly (3); B: Then the winding machine starts winding the inner liner (5) of the type IV hydrogen storage bottle. At this time, the inner liner (5) of the type IV hydrogen storage bottle rotates, and the joint body (301) and the joint shell (302) on the rotary joint assembly (3) rotate relative to each other through the bearing (303), so that the inner liner (5) of the type IV hydrogen storage bottle can be wound normally; C: When it is necessary to inflate the inner liner (5) of the type IV hydrogen storage bottle, close the pressure relief valve (403), open the stop valve (401) and the high-pressure pressure reducing valve (406), adjust the pressure to the maximum pressure value required by the inner liner (5) of the type IV hydrogen storage bottle, then adjust the low-pressure pressure reducing valve (404), observe the value of the pressure gauge (402), and further adjust the actual pressure required by the inner liner (5) of the type IV hydrogen storage bottle; D: After the winding is completed, close the high pressure reducing valve (406) and the stop valve (401), open the pressure relief valve (403), and after the pressure gauge (402) shows no pressure, remove the IV type hydrogen storage bottle liner (5), and move the IV type hydrogen storage bottle liner (5) to the curing furnace for curing; E: After the type IV hydrogen storage bottle liner (5) is installed in the curing furnace, the type IV hydrogen storage bottle liner (5) is reconnected to the gas charging pipeline assembly (4), the pressure relief valve (403) is closed, the stop valve (401) is opened, and the internal pressure value of the type IV hydrogen storage bottle liner (5) during the winding process is monitored by the pressure gauge (402) to ensure the normal operation of the curing of the type IV hydrogen storage bottle liner (5). After the curing is completed, the stop valve (401) is closed, the pressure relief valve (403) is opened, and after the pressure gauge (402) shows no pressure, the type IV hydrogen storage bottle liner (5) can be removed.

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