Sealing structure of bottled liquefied petroleum gas stop valve
By adopting a double-layer O-ring rubber sealing ring design in the bottled liquefied petroleum gas shut-off valve, the problem of reduced sealing performance under wear and external impact of the single sealing ring structure is solved, achieving higher sealing reliability and safety, and preventing gas leakage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-26
- Publication Date
- 2026-04-07
AI Technical Summary
The existing single-seal ring structure of bottled liquefied petroleum gas shut-off valves is prone to wear and aging after long-term use, resulting in a decline in sealing performance and an inability to effectively prevent gas leakage. In particular, it cannot maintain a stable sealing state under external impact or pressure changes, posing a safety hazard.
The valve employs a double-layer O-ring rubber seal design, including a first O-ring rubber seal and a second O-ring rubber seal on the outer arc surface of the piston rod, as well as the cooperation between the rubber sealing plug and the stainless steel cap. Through multiple sealing structures, pressure-reducing sealing and sliding sealing are provided during the piston rod sliding process, ensuring that the valve can effectively prevent gas leakage in both open and closed states.
It significantly improves the sealing reliability of valves, reduces the risk of liquefied petroleum gas leakage, avoids safety accidents such as fires and explosions, and ensures the safety and stability of the system.
Smart Images
Figure CN224093842U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of liquefied petroleum gas shut-off valves, specifically a sealing structure for a bottled liquefied petroleum gas shut-off valve. Background Technology
[0002] Liquefied petroleum gas (LPG) plays a vital role in industrial production and residential life as a widely used energy source. Bottled LPG is a common fuel supply method in many places due to its convenience. However, LPG is a flammable and explosive gas, and safety during its transportation and use is of paramount importance. As a key component controlling the flow of LPG, the shut-off valve's sealing performance directly affects the safety and stability of the entire system. Once the shut-off valve seal fails, LPG leakage will not only waste energy but may also cause serious safety accidents such as fires and explosions, posing a huge threat to the safety of people and property. Therefore, continuously optimizing the sealing structure of bottled LPG shut-off valves and improving their sealing performance has become a key task for the gas industry to ensure safety.
[0003] In the current field of bottled liquefied petroleum gas shut-off valve technology, the common shut-off valve sealing structure mainly adopts a simple single sealing ring design. Its working process is roughly as follows: the movement of the valve core is controlled by manual or mechanical device to realize the connection or blockage of the inlet and outlet channels. When the valve needs to be opened, the operating device drives the valve core away from the sealing position, allowing gas to flow from the inlet channel into the outlet channel; when the valve is closed, the operation is reversed to allow the valve core to return to the sealing position and prevent gas flow. This single sealing ring structure can achieve the sealing function to a certain extent.
[0004] Existing simple single-seal-ring shut-off valve sealing structures cannot effectively guarantee sealing performance. On the one hand, single seal rings are prone to wear and aging after long-term use, leading to a decline in sealing performance and an increased risk of gas leakage. On the other hand, during valve opening and closing, due to the lack of sufficient sealing redundancy, once the seal ring is subjected to a slight external impact or displacement, it cannot guarantee a good sealing effect and cannot effectively prevent liquefied petroleum gas leakage. In addition, under different pressure environments, single seal rings have difficulty adapting to pressure changes and maintaining a stable sealing state, making it difficult to meet the stringent requirements for the sealing safety of liquefied petroleum gas. Therefore, we propose a sealing structure for bottled liquefied petroleum gas shut-off valves. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a sealing structure for a bottled liquefied petroleum gas shut-off valve, which provides effective pressure-reducing sealing and sliding sealing, and can effectively solve the problems in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for a bottled liquefied petroleum gas shut-off valve, comprising a valve body, wherein an installation cavity is provided in the middle of the interior of the valve body, and an outlet channel opened at the left end of the interior of the valve body and an inlet channel opened at the right end of the interior of the valve body are connected through the installation cavity, and further comprising a circular sealing element;
[0007] Circular seal: It is threadedly connected to the upper middle part of the valve body. The circular seal has a step inside, and a through hole is opened in the middle of the step. A piston rod is slidably connected inside the through hole. A first O-ring rubber seal is connected between the lower inner end of the circular seal and the step through a gasket. The outer arc surface of the piston rod contacts the inner arc surface of the first O-ring rubber seal. A second O-ring rubber seal is provided at the upper end of the outer arc surface of the piston rod. The second O-ring rubber seal contacts the inner arc surface of the circular seal. A rubber sealing plug is provided on the lower side of the piston rod. The rubber sealing plug is configured to cooperate with the air inlet channel. By setting multiple O-ring rubber seals at the cooperation point between the piston rod and the circular seal, in conjunction with other structures, effective pressure-reducing sealing and sliding sealing can be provided in the valve opening and closing states, preventing liquefied petroleum gas leakage, greatly improving the valve sealing reliability, and reducing safety risks.
[0008] Furthermore, the upper end of the mounting cavity is threaded with a hexagonal valve port, the lower end of the piston rod is slidably connected to the inner wall of the hexagonal valve port on the outer arc surface, and the rubber sealing plug is fitted with the lower end of the hexagonal valve port for opening and closing the valve body.
[0009] Furthermore, a stainless steel cap is fixedly connected to the lower end of the rubber sealing plug, and a spring is provided between the upper surface of the stainless steel cap and the bottom wall of the mounting cavity for the piston rod to be reset.
[0010] Furthermore, the valve body has an air inlet pipe threaded to its right internal end, which is connected to the air inlet channel for easy connection to a liquefied petroleum gas cylinder.
[0011] Furthermore, a rubber sealing ring is provided on the outer arc surface of the right end of the air intake pipe to ensure sealing.
[0012] Furthermore, a threaded sleeve is rotatably connected to the middle of the outer arc surface of the air intake pipe, and a handwheel is fixedly connected to the left end of the outer arc surface of the threaded sleeve for easy connection with a liquefied petroleum gas cylinder.
[0013] Furthermore, a threaded connector is provided on the inner wall of the left end of the air outlet channel. The threaded connector can be an internal threaded connector or an external threaded connector. The main function of the threaded connector is to provide a stable connection with external exhaust equipment.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The sealing structure of this bottled liquefied petroleum gas shut-off valve has the following advantages:
[0015] At the mating point between the piston rod and the circular seal, a first O-ring and a second O-ring are installed. The first O-ring fits tightly against the outer arc surface of the piston rod as it slides, effectively preventing gas leakage from the gap between the piston rod and the circular seal, playing a crucial role in pressure reduction and sealing. The second O-ring further enhances the sealing effect, maintaining excellent sealing performance throughout the reciprocating movement of the piston rod. This ensures that the valve body effectively prevents gas leakage in both open and closed states, greatly improving the valve's sealing reliability and preventing safety accidents caused by liquefied petroleum gas leaks. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model;
[0017] Figure 2 This is a schematic planar structural diagram of the front cross-section of the valve body of this utility model;
[0018] Figure 3 This is a schematic diagram of the partial explosion of the piston rod and circular seal of this utility model.
[0019] In the diagram: 1. Handwheel, 2. Valve body, 3. Intake pipe, 4. Rubber sealing ring, 5. Spring, 6. Rubber sealing plug, 7. Stainless steel cap, 8. Piston rod, 9. First O-ring rubber seal, 10. Exhaust channel, 11. Second O-ring rubber seal, 12. Gasket, 13. Hexagonal valve port, 14. Circular seal, 15. Step, 16. Through hole, 17. Threaded sleeve, 18. Threaded connector, 19. Intake channel. Detailed Implementation
[0020] 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.
[0021] Please see Figure 1-3This embodiment provides a technical solution: a sealing structure for a bottled liquefied petroleum gas shut-off valve, including a valve body 2. The valve body 2 has an installation cavity in the middle. An outlet channel 10 opened at the left end of the valve body 2 and an inlet channel 19 opened at the right end of the valve body 2 are connected through the installation cavity. An inlet pipe 3 is threadedly connected to the right end of the valve body 2. The inlet pipe 3 is connected to the inlet channel 19. A rubber sealing ring 4 is provided on the outer arc surface of the right end of the inlet pipe 3. A threaded sleeve 17 is rotatably connected to the middle of the outer arc surface of the inlet pipe 3. A handwheel 1 is fixedly connected to the left end of the outer arc surface of the threaded sleeve 17. A threaded joint 18 is provided on the inner wall of the left end of the outlet channel 10. The threaded joint 18 can be an internal thread joint or an external thread joint. The main function of the threaded joint 18 is to be stably connected to an external exhaust device. Depending on the usage, the threaded joint 18 can be an internal thread provided on the inner wall of the left end of the outlet channel 10 or an external thread on the left end of the outer arc surface of the valve body 2. It also includes a circular seal 14.
[0022] Circular seal 14: It is threaded to the upper middle part of the valve body 2. The interior of the circular seal 14 has a step 15, and a through hole 16 is opened in the middle of the step 15. A piston rod 8 is slidably connected inside the through hole 16. A first O-ring rubber seal 9 is connected between the lower end of the interior of the circular seal 14 and the step 15 through a gasket 12. The first O-ring rubber seal 9 is riveted to the gasket 12 for pressure relief sealing function. The outer arc surface of the piston rod 8 contacts the inner arc surface of the first O-ring rubber seal 9. A second O-ring rubber seal 11 is provided at the upper end of the outer arc surface of the piston rod 8. The second O-ring rubber seal 11 contacts the inner arc surface of the circular seal 14. A rubber sealing plug is provided on the lower side of the piston rod 8. 6. A stainless steel cap 7 is fixedly connected to the lower end of the rubber sealing plug 6. A spring 5 is provided between the upper surface of the stainless steel cap 7 and the bottom wall of the mounting cavity. The rubber sealing plug 6 is fitted with the air inlet channel 19. A hexagonal valve port 13 is threadedly connected to the upper end of the mounting cavity. The lower end of the piston rod 8 is slidably connected to the inner wall of the hexagonal valve port 13. The rubber sealing plug 6 is fitted with the lower end of the hexagonal valve port 13. During operation, the operator first rotates the handwheel 1. The rotation of the handwheel 1 drives the threaded sleeve 17 to rotate. The threaded sleeve 17 is stably connected to the outlet of the liquefied gas cylinder. The rubber sealing ring 4 improves the sealing performance at the connection between the air inlet pipe 3 and the outlet of the liquefied gas cylinder. After the connection is stable, the operator stops rotating the handwheel 1. Wheel 1, and connect the threaded connector 18 at the left end of the outlet channel 10 to the external exhaust equipment to achieve stable installation of the shut-off valve. After installation, manually press down the piston rod 8. The piston rod 8 moves radially downward along the through hole 16, driving the rubber sealing plug 6 and the stainless steel cap 7 to move synchronously downward inside the installation cavity. At this time, the rubber sealing plug 6 moves away from the hexagonal valve port 13 and releases the blockage on the hexagonal valve port 13. During this process, the stainless steel cap 7 moves downward, causing the spring 5 to compress elastically. The gas inside the liquefied gas cylinder enters the installation cavity through the inlet pipe 3 and the inlet channel 19, and then flows through the hexagonal valve port 13 to the outlet channel 10 and then to the next working area. At this time, the valve body 2 In the open state, when the worker stops applying pressure to the piston rod 8, the elastic force of the spring 5 pushes the rubber sealing plug 6 upward through the stainless steel cap 7. The upward movement of the rubber sealing plug 6 pushes the piston rod 8 upward until the rubber sealing plug 6 adheres to and seals the hexagonal valve port 13 again. At this time, the valve body 2 is in the closed state. During the sliding process of the piston rod 8, its outer arc surface is always in close contact with the first O-ring rubber sealing ring 9, which plays the role of pressure reduction and sealing of the piston rod 8. At the same time, the second O-ring rubber sealing ring 11 at the upper end of the outer arc surface of the piston rod 8 moves with the piston rod 8, ensuring the sliding sealing of the piston rod 8 and ensuring the sealing of the valve body 2 when the piston rod 8 controls the opening and closing during operation.
[0023] The working principle of the shut-off valve for liquefied petroleum gas (LPG) cylinders provided by this utility model is as follows: During operation, the operator first rotates the handwheel 1. The rotation of the handwheel 1 drives the threaded sleeve 17 to rotate, stably connecting the threaded sleeve 17 to the outlet of the LPG cylinder. The rubber sealing ring 4 improves the sealing performance at the connection between the inlet pipe 3 and the outlet of the LPG cylinder. After the connection is stable, the operator stops rotating the handwheel 1 and stably connects the threaded connector 18 at the left end of the outlet channel 10 to the external exhaust equipment, thus achieving stable installation of the shut-off valve. After installation, the operator manually presses down the piston rod 8. The piston rod 8 moves radially downward along the through hole 16, causing the rubber sealing plug 6 and the stainless steel cap 7 to move synchronously downward inside the installation cavity. At this time, the rubber sealing plug 6 moves away from the hexagonal valve port 13 and releases the blockage of the hexagonal valve port 13. During this process, the stainless steel... As the steel cap 7 moves downward, the spring 5 is elastically compressed. The gas inside the liquefied gas cylinder enters the installation cavity through the inlet pipe 3 and the inlet channel 19, and then flows through the hexagonal valve port 13 to the outlet channel 10 and to the next working area. At this time, the valve body 2 is in the open state. The worker stops applying pressure to the piston rod 8. The elastic force of the spring 5 pushes the rubber sealing plug 6 upward through the stainless steel cap 7. The upward movement of the rubber sealing plug 6 pushes the piston rod 8 upward until the rubber sealing plug 6 adheres and seals the hexagonal valve port 13 again. At this time, the valve body 2 is in the closed state. During the sliding process of the piston rod 8, its outer arc surface is always in close contact with the first O-ring rubber sealing ring 9, which plays the role of pressure reduction and sealing of the piston rod 8. At the same time, the second O-ring rubber sealing ring 11 at the upper end of the outer arc surface of the piston rod 8 moves with the piston rod 8 to ensure the sliding sealing of the piston rod 8.
[0024] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A sealing structure for a bottled liquefied petroleum gas shut-off valve, comprising a valve body (2), wherein an installation cavity is provided in the middle of the interior of the valve body (2), and an outlet channel (10) opened at the left end of the interior of the valve body (2) and an inlet channel (19) opened at the right end of the interior of the valve body (2) are connected through the installation cavity, characterized in that: It also includes a circular seal (14); Circular seal (14): It is threaded to the upper middle part of the valve body (2). The circular seal (14) has a step (15) inside. A through hole (16) is opened in the middle of the step (15). A piston rod (8) is slidably connected inside the through hole (16). A first O-ring rubber seal (9) is connected between the lower inner end of the circular seal (14) and the step (15) through a gasket (12). The outer arc surface of the piston rod (8) contacts the inner arc surface of the first O-ring rubber seal (9). A second O-ring rubber seal (11) is provided at the upper end of the outer arc surface of the piston rod (8). The second O-ring rubber seal (11) contacts the inner arc surface of the circular seal (14). A rubber sealing plug (6) is provided on the lower side of the piston rod (8). The rubber sealing plug (6) is configured to cooperate with the air intake channel (19).
2. The sealing structure of a bottled liquefied petroleum gas shut-off valve according to claim 1, characterized in that: The upper end of the mounting cavity is threaded with a hexagonal valve port (13), the lower end of the piston rod (8) is slidably connected to the inner wall of the hexagonal valve port (13), and the rubber sealing plug (6) is fitted with the lower end of the hexagonal valve port (13).
3. The sealing structure of a bottled liquefied petroleum gas shut-off valve according to claim 1, characterized in that: A stainless steel cap (7) is fixedly connected to the lower end of the rubber sealing plug (6), and a spring (5) is provided between the upper surface of the stainless steel cap (7) and the bottom wall of the mounting cavity.
4. The sealing structure of a bottled liquefied petroleum gas shut-off valve according to claim 1, characterized in that: The valve body (2) has an air intake pipe (3) threadedly connected to the right end of the interior, and the air intake pipe (3) is connected to the air intake channel (19).
5. The sealing structure of a bottled liquefied petroleum gas shut-off valve according to claim 4, characterized in that: The right end of the air intake pipe (3) is provided with a rubber sealing ring (4).
6. The sealing structure of a bottled liquefied petroleum gas shut-off valve according to claim 4, characterized in that: The outer arc surface of the air intake pipe (3) is rotatably connected to a threaded sleeve (17), and a handwheel (1) is fixedly connected to the left end of the outer arc surface of the threaded sleeve (17).
7. The sealing structure of a bottled liquefied petroleum gas shut-off valve according to claim 1, characterized in that: The left end of the air outlet channel (10) is provided with a threaded connector (18), which can be an internal threaded connector or an external threaded connector.