Gas pipeline check valve

Abstract

The utility model relates to the technical field of check valves, in particular to a gas pipeline check valve which comprises a valve body and a valve cover detachably connected to the valve body, a sleeve part is fixedly installed at the bottom of the valve cover, and a valve rod is connected to the inner side of the sleeve part in a sliding mode. Wherein the lower end of the valve rod is detachably connected with a valve clack abutting against the sealing position of the valve body, and an adjusting assembly for adjusting the elastic force of the elastic piece is arranged on the outer side of the valve rod. In this way, the variability of opening pressure can be achieved after the elastic force is changed according to the pressure requirement in a gas pipeline, so that better adaptability is achieved, and the opening requirements of different pressure in different gas pipelines are met; and when the valve clack is damaged after being used for a long time, the valve clack can be conveniently replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a check valve for gas pipelines. Background Art

[0002] In a pipeline system for transporting fluids or gases, a check valve can prevent the reverse flow of fluids or gases during pipeline failures or repairs.

[0003] The core part of a check valve is a movable valve flap. The valve flap opens under the pressure of the pipeline medium flow. When the medium flow stops or reverses, the valve flap closes under the action of gravity or spring force, thereby preventing the reverse flow of the medium. For details, reference can be made to a check valve for gas pipelines disclosed in Chinese Patent Publication No. "CN103388692B" and a flange lift check valve disclosed in Chinese Patent Publication No. "CN102606773A".

[0004] In the current structure of a lift check valve, a spring is used to support the valve flap. When the gas pressure is greater than the elastic force of the spring, the valve flap moves upward and the passage opens. However, in actual use, since the opening air pressures of different pipeline gas paths are different, it is difficult to meet the requirements of different opening air pressures with a spring structure of a rated opening value. Based on this, in order to solve the above problems, we propose a check valve for gas pipelines. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a check valve for gas pipelines to solve the disadvantages in the prior art, such as the difficulty in meeting the requirements of different opening air pressures with a spring structure of a rated opening value.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] Design a check valve for gas pipelines, including a valve body and a valve cover detachably connected to the valve body. A sleeve part is fixedly installed at the bottom of the valve cover, and a valve rod is slidably connected to the inside of the sleeve part;

[0008] The lower end of the valve rod is detachably connected to a valve flap that abuts against the sealing part of the valve body. An elastic member is arranged between the valve rod and the sleeve part, and an adjusting assembly for adjusting the elastic force of the elastic member is arranged on the outer side of the valve rod.

[0009] Furthermore, the elastic member is a spring, and the two ends of the spring respectively abut between the sleeve part and the adjusting assembly.

[0010] Furthermore, the adjusting assembly includes a gasket sleeved on the outer side of the valve rod, and the gasket is arranged at the lower end of the elastic member;

[0011] Wherein, a threaded section is provided at the bottom of the valve stem, and an adjusting nut is threadedly connected to the outside of the threaded section, and the adjusting nut abuts against the lower side of the gasket.

[0012] Furthermore, a limiting structure is also provided between the valve stem and the sleeve part.

[0013] Furthermore, the limiting structure includes a slotted crosshead opened on the outside of the sleeve part, and a guiding bolt is threadedly connected to the outside of the valve stem, and the guiding bolt slides in the slotted crosshead.

[0014] Furthermore, a positioning glass bead is embedded on the outside of the bottom of the valve stem, a connecting pipe is fixed to the top of the valve flap, the connecting pipe sleeves the valve stem, and a positioning hole adapted to the telescopic end of the positioning glass bead is opened on the outside.

[0015] A gas pipeline check valve proposed by the present utility model has the beneficial effects that: in the present utility model, through the design of the adjusting assembly, the elastic force of the elastic member can be adjusted, so that according to the pressure requirement in the gas pipeline, after changing the elastic force, the variability of the opening pressure can be realized, so as to achieve better adaptability and meet the opening requirements of different pressures in different gas pipelines. Secondly, in the present utility model, the valve stem and the valve flap adopt a detachable connection design, which can make the valve flap be conveniently replaced when it is damaged after long-term use, further improving its durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of the present utility model;

[0017] Figure 2 is a cross-sectional view of the present utility model;

[0018] Figure 3 is a schematic structural diagram of the adjusting assembly of the present utility model.

[0019] In the figure: 1, valve body; 2, valve cover; 21, sleeve part; 3, valve stem; 31, threaded section; 32, positioning glass bead; 33, positioning hole; 4, valve flap; 41, connecting pipe; 5, elastic member; 6, adjusting assembly; 61, gasket; 62, adjusting nut; 7, limiting structure; 71, slotted crosshead; 72, guiding bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0021] Refer to Figures 1-3This is an embodiment of the present utility model, which discloses a check valve for a gas pipeline. The check valve includes a valve body 1 and a valve cover 2 detachably connected to the valve body 1. A sleeve portion 21 is fixedly installed at the bottom of the valve cover 2, and a valve stem 3 is slidably connected inside the sleeve portion 21;

[0022] Wherein, the lower end of the valve stem 3 is detachably connected to a valve flap 4 that abuts against the sealing portion of the valve body 1. An elastic member 5 is provided between the valve stem 3 and the sleeve portion 21, and an adjusting assembly 6 for adjusting the elastic force of the elastic member 5 is provided outside the valve stem 3.

[0023] Specifically, in the present utility model, by adopting the design of the adjusting assembly 6, the elastic force of the elastic member 5 can be adjusted. Thus, according to the pressure requirements in the gas pipeline, after changing the elastic force, the variability of the opening pressure can be achieved, so as to achieve better adaptability.

[0024] In some embodiments, the elastic member 5 in the present utility model is a spring, and both ends of the spring respectively abut between the sleeve portion 21 and the adjusting assembly 6.

[0025] On the basis of the above embodiments, in this embodiment, the adjusting assembly 6 includes a gasket 61 sleeved outside the valve stem 3, and the gasket 61 is arranged at the lower end of the elastic member 5;

[0026] Wherein, a threaded section 31 is provided at the bottom of the valve stem 3, and an adjusting nut 62 is threadedly connected to the outside of the threaded section 31, and the adjusting nut 62 abuts against the lower side of the gasket 61.

[0027] That is to say, in this embodiment, by adopting the threaded connection method of the adjusting nut 62 and the threaded section 31, when the adjusting nut 62 is rotated, it can move upward or downward. For example, when moving upward, it pushes the gasket 61 to compress the spring. Since the upper end of the spring is blocked by the sleeve portion 21, the effective length of the spring is compressed at this time, so the reaction force increases. At this time, a larger opening pressure can be adapted, and vice versa, the opening pressure becomes smaller.

[0028] It should be noted that in this embodiment, the adjustment method requires opening the valve cover 2. In this embodiment, the valve cover 2 and the valve body 1 are connected by bolts to achieve a convenient disassembly effect. In addition, a sealing gasket is also provided between the valve cover 2 and the valve body 1 to improve the sealing performance of their connection.

[0029] Furthermore, in this embodiment, a limiting structure 7 is also provided between the valve stem 3 and the sleeve portion 21. By setting the limiting structure 7, it is used to prevent the valve stem 3 from slipping out of the inside of the sleeve portion 21, so as to play a limiting role and improve the convenience of assembly.

[0030] Based on the above embodiments, in this embodiment, the limiting structure 7 includes a slotted groove 71 formed on the outer side of the sleeve portion 21. A guiding bolt 72 is threadedly connected to the outer side of the valve stem 3, and the guiding bolt 72 slides in the slotted groove 71.

[0031] That is to say, in this embodiment, when the valve cover 2 is opened, due to the restriction of the guiding bolt 72 at this time, the entire valve stem 3 can be taken out together, so as to avoid the maintenance and replacement of the valve stem 3 and the valve flap 4, thereby improving the operation convenience. During disassembly, only the guiding bolt 72 needs to be disassembled, and the entire valve stem 3 can be taken out from the inside of the sleeve portion 21, and the operation is simple and convenient.

[0032] Of course, considering the situation that the valve flap 4 is damaged after long-term use, in order to facilitate its replacement, in this embodiment, a positioning bead 32 is embedded on the outer side of the bottom of the valve stem 3. A connecting pipe 41 is fixed to the top of the valve flap 4. The connecting pipe 41 sleeves the valve stem 3 and is provided with a positioning hole 33 on the outer side that is adapted to the telescopic end of the positioning bead 32. The structure of the positioning bead 32 is a prior art and will not be elaborated here. In this embodiment, when the valve flap 4 needs to be replaced, only the telescopic section of the positioning bead 32 needs to be pressed inward to make it retract, and at this time, the valve stem 3 and the valve flap 4 can be separated. Of course, in other embodiments, the above positioning bead 32 can also be replaced by a bolt, and the bolt penetrates the positioning hole 33 and is threadedly connected to the valve stem 3, so as to obtain a higher fastening force. This means is a conventional means for those skilled in the art and will not be elaborated here.

[0033] In summary, in the present utility model, by adopting the design of the adjusting assembly 6, the elastic force of the elastic member 5 can be adjusted. In this way, according to the pressure requirements in the gas pipeline, after changing the elastic force, the variability of the opening pressure can be realized, so as to achieve better adaptability and meet the opening requirements of different pressures in different gas pipelines. Secondly, in the present utility model, the valve stem 3 and the valve flap 4 adopt a detachable connection design, which enables the valve flap 4 to be conveniently replaced when it is damaged after long-term use, further improving its durability.

[0034] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A gas pipeline check valve, comprising a valve body (1) and a valve cover (2) detachably connected to the valve body (1), characterized in that: A sleeve part (21) is fixedly installed at the bottom of the valve cover (2), and a valve rod (3) is slidably connected inside the sleeve part (21); The lower end of the valve rod (3) is detachably connected with a valve flap (4) that abuts against the sealing part of the valve body (1). An elastic member (5) is arranged between the valve rod (3) and the sleeve part (21), and an adjusting assembly (6) for adjusting the elastic force of the elastic member (5) is arranged on the outer side of the valve rod (3).

2. The gas pipeline check valve according to claim 1, characterized in that: The elastic member (5) is a spring, and the two ends of the spring respectively abut between the sleeve part (21) and the adjusting assembly (6).

3. A gas pipeline check valve according to claim 1 or 2, characterized in that: The adjusting assembly (6) includes a gasket (61) sleeved on the outer side of the valve rod (3), and the gasket (61) is arranged at the lower end of the elastic member (5); Wherein, a threaded section (31) is arranged at the bottom of the valve rod (3), and an adjusting nut (62) is threadedly connected to the outer side of the threaded section (31), and the adjusting nut (62) abuts against the lower side of the gasket (61).

4. A gas pipeline check valve according to claim 1, characterized in that: A limiting structure (7) is further arranged between the valve rod (3) and the sleeve part (21).

5. The gas pipeline check valve according to claim 4, wherein: The limiting structure (7) includes a straight slot (71) opened on the outer side of the sleeve part (21), and a guiding bolt (72) is threadedly connected to the outer side of the valve rod (3), and the guiding bolt (72) slides in the straight slot (71).

6. The gas pipeline check valve according to claim 1, characterized in that: A positioning bead (32) is embedded on the outer side of the bottom of the valve rod (3), a connecting pipe (41) is fixed at the top of the valve flap (4), the connecting pipe (41) sleeves the valve rod (3), and a positioning hole (33) adapted to the telescopic end of the positioning bead (32) is opened on the outer side.

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