A safety valve

Abstract

This utility model discloses a safety valve, the key technical point of which is that it includes a valve body, a sealing cavity, an inlet end and an outlet end provided on the valve body, a valve seat provided in the sealing cavity, the valve seat dividing the sealing cavity into an installation cavity and a connecting cavity, a sealing plug provided in the connecting cavity, an installation part protruding from the lower end of the valve seat, the sealing plug being sleeved on the installation part, a pressure spring provided in the installation cavity, one end of the pressure spring abutting against the valve seat and the other end abutting against the valve body. This safety valve can maintain the flexibility of the valve stem while ensuring the easy removal of the sealing element.

Description

Technical Field

[0001] This utility model relates to a valve, and more specifically, to a safety valve. Background Technology

[0002] Spring-loaded safety valves achieve automatic opening and closing through the dynamic balance between spring preload and medium pressure. When the system pressure is normal, the spring presses the valve disc tightly against the valve seat through its preload, forming a seal. When the system pressure abnormally rises to the set value (i.e., the set pressure), the force of the medium overcomes the spring force, pushing the valve disc upward. At this time, the medium is discharged through the gap between the valve disc and the valve seat (the venting channel), and the system pressure begins to drop.

[0003] In long-term practical application, spring-loaded safety valves have gradually revealed some problems that urgently need to be solved. Among them, the assembly structure of the seal and valve stem and its impact on the linkage transmission performance are particularly prominent. Specifically, based on the dual considerations of ease of seal maintenance and transmission reliability, existing technologies usually adopt a design scheme in which the seal is directly fitted onto the valve stem—for example, the patent technology scheme of our company with the earlier application publication number CN216344204U. However, in actual engineering applications, this structure has given rise to new technical contradictions: in order to ensure a reliable connection between the seal piston and the linkage, the tightness between the piston and the linkage is relatively large, but this fixing method inevitably leads to a significant increase in the linkage rotation resistance and movement assistance. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a safety valve that can maintain the flexibility of the valve stem while ensuring the easy disassembly of the sealing element.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a safety valve, comprising a valve body, wherein a sealing cavity, an inlet end, and an outlet end are provided on the valve body, a valve seat is provided in the sealing cavity, the valve seat divides the sealing cavity into an installation cavity and a connecting cavity, a sealing plug is provided in the connecting cavity, an installation part protrudes from the lower end of the valve seat, the sealing plug is sleeved on the installation part, a pressure spring is provided in the installation cavity, one end of the pressure spring abuts against the valve seat, and the other end abuts against the valve body.

[0006] The present invention is further configured such that the valve body is T-shaped.

[0007] The present invention is further configured such that: a valve stem is slidably connected in the mounting cavity; an operating hole is provided through the valve seat and the mounting part; and the first end of the valve stem passes through the operating hole and is linked with the sealing plug.

[0008] The upper end of the valve body is provided with a mounting hole, and the second end of the valve stem extends outward through the mounting hole.

[0009] The present invention is further provided with a connecting structure at the second end of the valve stem.

[0010] The present invention is further configured such that: the central part of the sealing plug is hollow and has a linkage groove for the valve stem to be inserted.

[0011] The present invention is further configured such that: the sealing plug includes, from top to bottom, an abutting part, a sealing part and a columnar part, the sealing part is provided with a prismatic structure, a sealing step is provided in the communicating cavity, and the sealing part and the sealing step are abutting each other.

[0012] The present invention is further configured such that: a sealing head is provided at the lower end of the columnar part, the sealing head is configured in a semi-circular structure, and a sealing arc surface is provided at the inlet end.

[0013] The present invention is further configured such that the diameter of the valve stem is smaller than the diameter of the linkage groove.

[0014] The present invention is further configured such that: a limiting ring is provided at the upper end of the valve seat, a limiting step is provided in the valve body, and the limiting ring abuts against the limiting step.

[0015] In summary, this utility model has the following beneficial effects: by setting an installation part on the valve seat, the installation object of the sealing plug is changed from being connected to the valve stem to being connected to the valve seat. Therefore, the rotation and movement of the valve stem are not restricted during use, ensuring the stability of the valve stem during use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a safety valve;

[0017] Figure 2 This is a cross-sectional view of a safety valve;

[0018] Figure 3 This is a schematic diagram of the partial separation structure of a safety valve.

[0019] Reference numerals: 1. Valve body; 11. Sealing step; 12. Limiting step; 2. Sealing cavity; 21. Mounting cavity; 22. Communicating cavity; 3. Inlet end; 31. Sealing arc surface; 4. Output end; 5. Valve seat; 51. Mounting part; 52. Operating hole; 53. Limiting ring; 6. Sealing plug; 61. Linkage groove; 62. Abutment part; 63. Sealing part; 64. Columnar part; 65. Sealing head; 7. Pressure spring; 8. Valve stem; 81. Connecting structure. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] Reference Figures 1 to 3 As shown, to achieve the above objectives, this utility model provides the following technical solution: a safety valve, including a valve body 1, a sealing cavity 2, an inlet end 3 and an outlet end 4 provided on the valve body 1, a valve seat 5 provided in the sealing cavity 2, the valve seat 5 dividing the sealing cavity 2 into an installation cavity 21 and a connecting cavity 22, a sealing plug 6 provided in the connecting cavity 22, an installation part 51 protruding from the lower end of the valve seat 5, the sealing plug 6 being sleeved on the installation part 51, a pressure spring 7 provided in the installation cavity 21, one end of the pressure spring 7 abutting against the valve seat 5, and the other end abutting against the valve body 1.

[0022] The present invention is further configured such that: a valve stem 8 is slidably connected in the mounting cavity 21, and an operation hole 52 is provided through the valve seat 5 and the mounting part 51, and the first end of the valve stem 8 passes through the operation hole 52 and is linked with the sealing plug 6.

[0023] The upper end of the valve body 1 is provided with a mounting hole, and the second end of the valve stem 8 extends outward through the mounting hole.

[0024] The design of this utility model changes the installation object of the sealing plug 6 by setting an installation part 51 on the valve seat 5, changing it from being connected to the valve stem 8 to being connected to the valve seat 5. Therefore, the rotation and movement of the valve stem 8 are not restricted during use, ensuring the stability of the valve stem 8 in use.

[0025] The present invention is further configured such that the valve body 1 is T-shaped.

[0026] The present invention is further configured such that a connecting structure 81 is provided at the second end of the valve stem 8. The design of the connecting structure 81 enables this end of the valve stem 8 to be connected to an external device for monitoring the opening and closing status of the safety valve.

[0027] like Figure 1 As shown, the connection structure 81 can be a through hole for external connection via bolts.

[0028] This invention is further configured such that a linkage groove 61 for inserting the valve stem 8 is provided in the hollow center of the sealing plug 6. The diameter of the valve stem 8 is smaller than the diameter of the linkage groove 61. Compared with the previously designed safety valve, this structural design effectively reduces the diameter of the valve stem 8, increases the sealing extension space, and prevents the valve stem 8 from being squeezed too close to the sealing plug 6 when the valve stem 8 is large, resulting in a deviation in the extension effect.

[0029] For example, in the original design, the valve stem 8 and the sealing plug 6 were connected. When the sealing plug 6 needed to be replaced, it could be removed through the valve stem 8. If the valve stem 8 were simply reduced in size, it would not form an effective fit with the sealing plug 6, resulting in the sealing plug 6 becoming stuck. Therefore, when the connection of the sealing plug 6 is changed from the valve stem 8 to the valve seat 5, the easy removal of the sealing plug is ensured, the independence of the valve stem 8 is increased, and its size can be designed to be smaller.

[0030] This invention is further configured such that the sealing plug 6 comprises, from top to bottom, an abutment portion 62, a sealing portion 63, and a columnar portion 64. The sealing portion 63 has a prismatic structure, and a sealing step 11 is provided within the communicating cavity 22. The sealing portion 63 abuts against the sealing step 11. This structural design maintains the sealing between the sealing plug 6 and the valve body 1 in the blocked state, preventing backflow of liquid from flowing upwards.

[0031] The present invention is further configured such that: a sealing head 65 is provided at the lower end of the columnar part 64, the sealing head 65 is configured in a semi-circular structure, and a sealing arc surface 31 is provided at the inlet end 3.

[0032] This structural design increases the contact area.

[0033] The present invention is further configured such that: a limiting ring 53 is provided at the upper end of the valve seat 5, and a limiting step 12 is provided inside the valve body 1, with the limiting ring 53 abutting against the limiting step 12.

[0034] The design of this structure ensures multiple points of sealing between the valve seat 5, the sealing plug 6, and the valve body 1, guaranteeing a sealing effect.

[0035] In summary, according to the design of this utility model, when fluid flows into the communicating cavity 22 from the inlet end 3, when the thrust of the fluid is greater than the preload of the pressure spring 7, the sealing plug 6 is lifted upward. At this time, the outlet end 4 is connected to the inlet end 3, allowing the fluid to flow out to the outlet end 4.

[0036] When the sealing plug 6 is lifted upward, it pushes the valve stem 8 upward, and at this time, the fluid movement is recorded by an external device (including a sensor).

[0037] When the fluid thrust decreases and is less than the preload of the pressure spring 7, the sealing plug 6 moves downward under the action of the pressure spring 7 until it blocks the inlet end 3.

[0038] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A safety valve, comprising a valve body (1), wherein the valve body (1) is provided with a sealing cavity (2), an inlet end (3) and an outlet end (4), characterized in that: A valve seat (5) is provided in the sealing cavity (2). The valve seat (5) divides the sealing cavity (2) into an installation cavity (21) and a connecting cavity (22). A sealing plug (6) is provided in the connecting cavity (22). An installation part (51) protrudes from the lower end of the valve seat (5). The sealing plug (6) is sleeved on the installation part (51). A pressure spring (7) is provided in the installation cavity (21). One end of the pressure spring (7) abuts against the valve seat (5), and the other end abuts against the valve body (1).

2. A safety valve according to claim 1, characterized in that: The valve body (1) is T-shaped.

3. A safety valve according to claim 1, characterized in that: A valve stem (8) is slidably connected in the mounting cavity (21). An operating hole (52) is provided through the valve seat (5) and the mounting part (51). The first end of the valve stem (8) passes through the operating hole (52) and is linked with the sealing plug (6). The valve body (1) has an installation hole at its upper end, and the second end of the valve stem (8) extends outward through the installation hole.

4. A safety valve according to claim 3, characterized in that: A connecting structure (81) is provided at the second end of the valve stem (8).

5. A safety valve according to claim 3, characterized in that: The sealing plug (6) is hollow in the middle and has a linkage groove (61) for the valve stem (8) to be inserted.

6. A safety valve according to any one of claims 1-5, characterized in that: The sealing plug (6) includes, from top to bottom, an abutting part (62), a sealing part (63), and a columnar part (64). The sealing part (63) is arranged in a prismatic structure. A sealing step (11) is provided in the communicating cavity (22). The sealing part (63) and the sealing step (11) are abutting each other.

7. A safety valve according to claim 6, characterized in that: The lower end of the columnar part (64) is provided with a sealing head (65), the sealing head (65) is provided with a semi-circular structure, and the inlet end (3) is provided with a sealing arc surface (31).

8. A safety valve according to claim 5, characterized in that: The diameter of the valve stem (8) is smaller than that of the linkage groove (61).

9. A safety valve according to claim 1, characterized in that: The upper end of the valve seat (5) is provided with a limiting ring (53), and the valve body (1) is provided with a limiting step (12), and the limiting ring (53) abuts against the limiting step (12).

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