Low-leakage-rate ultralow-temperature ball valve
By designing a low leakage rate ultra-low temperature ball valve with a removable built-in pressure relief valve and filter device, the problem of pressure relief function failure caused by impurities is solved, and the long-term stability and safety of the device are achieved.
Patent Information
- Application Number
- CN202422261089.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The existing ultra-low temperature pressure relief ball valves are prone to blockage due to impurities during long-term use, resulting in failure of pressure relief function, which poses safety hazards.
Designed as a removable structure, a built-in pressure relief valve is equipped with a filter device to prevent impurities from entering and facilitate easy replacement and maintenance through threaded connections.
It effectively avoids impurities accumulation and spring aging, ensures the long-term stability and safety of the pressure relief device, and prevents the pressure relief pressure from getting out of control.
Smart Images
Figure CN223063204U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of valves, and particularly relates to a cryogenic ball valve with a low leakage rate. Background Technique
[0002] A ball valve is a commonly used valve that controls the flow of fluid through a rotating sphere. When the sphere is aligned with the pipe axis, the fluid can pass through; when the sphere rotates 90 degrees and is perpendicular to the pipe axis, the fluid is blocked. This design makes the ball valve have fast switching and good sealing performance.
[0003] In the petrochemical industry, especially in the transmission and processing of liquefied natural gas (LNG) and other cryogenic media, the requirements for valves are very high. These media not only have extremely low temperatures, but also vaporize when the temperature rises, and the volume expands sharply, which may cause abnormal pressure increase. To ensure the safety and reliability of the system, the design and application of cryogenic pressure relief ball valves have become a key technical point.
[0004] The prior art Chinese patent number 2021105264468 discloses a cryogenic deep - freeze top - mounted ball valve with an internal pressure relief valve. This technical solution can achieve the effect of automatic pressure relief inside the valve. However, in the actual application process, since the transmission medium often contains impurities, the internal pressure relief valve is prone to blockage after long - term use, resulting in the failure of the pressure relief function and posing a safety hazard. Content of the Utility Model
[0005] To solve the above problems, the utility model provides a cryogenic ball valve with a low leakage rate, which can replace the internal pressure relief valve to avoid blockage caused by long - term use.
[0006] The cryogenic ball valve with a low leakage rate includes a valve seat, a sphere, a valve body and a pressure relief device. The valve seat and the sphere are installed in the valve body. The sealing surface of the valve seat abuts against the surface of the sphere. An inner cavity is formed between the sphere and the valve body. An upstream channel is formed between one side of the valve seat and the valve body. A T - shaped pressure relief channel is provided between the inner cavity and the upstream channel. The pressure relief device is arranged in the T - shaped pressure relief channel.
[0007] Further, the pressure relief device includes a housing and a pressure relief piston. The pressure relief piston is arranged in the housing. The T - shaped pressure relief channel includes an air inlet channel and an air outlet channel. The air inlet channel communicates with the inner cavity, and the air outlet channel communicates with the upstream channel.
[0008] Further, a first through - hole is provided at the lower end of the housing, and a second through - hole is provided on the surface of the housing. The second through - hole corresponds to the air inlet channel.
[0009] Further, several second through - holes are provided and arranged along the surface of the housing.
[0010] Further, a pressure relief piston is arranged at the first through hole. The pressure relief piston includes a plug, a baffle plate, and a spring. One end of the spring abuts against the bottom of the housing, and the other end abuts against the bottom of the plug. The baffle plate is fixed in the housing, a third through hole is provided in the middle of the baffle plate, and the upper end of the plug abuts against the third through hole.
[0011] Further, an external thread structure is provided on the upper end surface of the housing, and an internal thread structure is provided at the corresponding position of the air outlet channel. The pressure relief device is connected to the air outlet channel through meshing of the thread structure.
[0012] Further, a first sealing ring is provided between the bottom of the housing and the air outlet channel.
[0013] Further, a second sealing ring and a third sealing ring are provided at the upper end of the air outlet channel.
[0014] Further, a filter device is provided at the end of the air inlet channel.
[0015] The beneficial effects of the present utility model are as follows:
[0016] 1. The built-in pressure relief valve is a detachable structure. After long-term use, it can be disassembled for maintenance or replacement. On the one hand, it can avoid the accumulation of impurities affecting the pressure relief effect, and on the other hand, it can avoid the aging of the spring of the pressure relief valve after long-term use and the out-of-control of the pressure relief value.
[0017] 2. A filter device is provided at the connection between the inner cavity and the built-in pressure relief valve, which can reduce the entry of impurities into the built-in pressure relief valve. Description of the Drawings
[0018] Figure 1 It is a partial structural schematic diagram of the low-leakage-rate cryogenic ball valve (excluding the pressure relief device) of the present utility model.
[0019] Figure 2 It is a partial structural schematic diagram of the low-leakage-rate cryogenic ball valve of the present utility model.
[0020] Figure 3 It is a structural schematic diagram of the pressure relief device in the low-leakage-rate cryogenic ball valve of the present utility model.
[0021] Reference numerals: inner cavity 1, air inlet channel 2, internal thread structure 3, third sealing ring 4, second sealing ring 5, air outlet channel 6, first sealing ring 7, upstream channel 8, filter device 9, pressure relief device 10, valve seat 11, ball 12, spring 13, baffle plate 14, housing 15, second through hole 16, plug 17. Specific Embodiments
[0022] Next, the technical solutions in the embodiments of the present utility model will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0023] Low-leakage ultra-low temperature ball valve, comprising a valve seat, a ball, a valve body and a pressure relief device. The valve seat and the ball are installed in the valve body. The sealing surface of the valve seat abuts against the surface of the ball. An inner cavity is formed between the ball and the valve body. An upstream channel is formed between one side of the valve seat and the valve body. A T-shaped pressure relief channel is provided between the inner cavity and the upstream channel. The pressure relief device is arranged in the T-shaped pressure relief channel. The pressure relief device comprises a housing and a pressure relief piston. The pressure relief piston is arranged in the housing. The T-shaped pressure relief channel comprises an air inlet channel and an air outlet channel. The air inlet channel communicates with the inner cavity, and the air outlet channel communicates with the upstream channel. A first through hole is provided at the lower end of the housing, and a second through hole is provided on the surface of the housing. The second through hole corresponds to the air inlet channel. A plurality of second through holes are provided and arranged along the surface of the housing. The pressure relief piston is arranged at the first through hole. The pressure relief piston comprises a plug, a baffle and a spring. One end of the spring abuts against the bottom of the housing, and the other end abuts against the bottom of the plug. The baffle is fixed in the housing. A third through hole is provided in the middle of the baffle. The upper end of the plug abuts against the third through hole. An external thread structure is provided on the upper end surface of the housing, and an internal thread structure is provided at the corresponding position of the air outlet channel. The pressure relief device is connected to the air outlet channel through thread engagement. A first sealing ring is provided between the bottom of the housing and the air outlet channel. A second sealing ring and a third sealing ring are provided at the upper end of the air outlet channel. A filter device is provided at the end of the air inlet channel.
[0024] The actual application method is as follows:
[0025] One end of the T-shaped pressure relief channel is connected to the inner cavity, and the other end is connected to the upstream channel. When the medium remaining in the inner cavity vaporizes as the temperature rises, a large pressure is generated in the inner cavity. When the pressure reaches the threshold value, the plug can be pushed down and opened, and then pressure relief starts. The pressure relief medium directly flows back into the upstream channel.
[0026] The pressure relief device is in an overall assembled state, and a thread structure is provided at the upper end, which can be engaged and connected with the T-shaped pressure relief channel. And a plurality of second through holes corresponding to the air inlet channel are provided on the housing, which can ensure that no matter what the position of the pressure relief device is after assembly, the pressure relief gas can smoothly enter the air outlet channel.
[0027] During replacement, loosen the connection between the pressure relief device and the T-shaped pressure relief channel, and the replacement and maintenance can be completed.
[0028] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model.
Claims
1. Ultra-low leakage rate cryogenic ball valve, characterized in that, It includes a valve seat, a sphere, a valve body and a pressure relief device. The valve seat and the sphere are installed in the valve body. The sealing surface of the valve seat abuts against the surface of the sphere. An inner cavity is formed between the sphere and the valve body. An upstream channel is formed between one side of the valve seat and the valve body. A T-shaped pressure relief channel is provided between the inner cavity and the upstream channel. The pressure relief device is arranged in the T-shaped pressure relief channel.
2. The cryogenic ball valve with low leakage rate according to claim 1, wherein The pressure relief device includes a housing and a pressure relief piston. The pressure relief piston is arranged in the housing. The T-shaped pressure relief channel includes an air inlet channel and an air outlet channel. The air inlet channel communicates with the inner cavity, and the air outlet channel communicates with the upstream channel.
3. The cryogenic ball valve with low leakage rate according to claim 2, characterized in that, A first through hole is provided at the lower end of the housing, and a second through hole is provided on the surface of the housing. The second through hole corresponds to the air inlet channel.
4. The cryogenic ball valve with low leakage rate according to claim 3, characterized in that, There are several second through holes, which are arranged along the surface of the housing.
5. The cryogenic ball valve with low leakage rate according to claim 4, characterized in that, The pressure relief piston is arranged at the first through hole. The pressure relief piston includes a plug, a baffle and a spring. One end of the spring abuts against the bottom of the housing, and the other end abuts against the bottom of the plug. The baffle is fixed in the housing. A third through hole is provided in the middle of the baffle, and the upper end of the plug abuts against the third through hole.
6. The cryogenic ball valve with low leakage rate according to claim 5, characterized in that An external thread structure is provided on the upper end surface of the housing, and an internal thread structure is provided at the corresponding position of the air outlet channel. The pressure relief device is connected to the air outlet channel through the engagement of the thread structure.
7. The cryogenic ball valve with low leakage rate according to claim 6, characterized in that, A first sealing ring is provided between the bottom of the housing and the air outlet channel.
8. The cryogenic ball valve with low leakage rate according to claim 7, characterized in that, A second sealing ring and a third sealing ring are provided at the upper end of the air outlet channel.
9. The cryogenic ball valve with low leakage rate according to claim 8, wherein, A filter device is provided at the end of the air inlet channel.