Pressure relief valve for natural gas pipeline

Abstract

The utility model discloses a natural gas pipeline pressure relief valve which comprises a valve body and a valve cover fixed at the upper end of the valve body through a bolt, a valve cavity is arranged in the valve body, a valve seat is fixedly arranged in the valve cavity, and the left side and the right side of the lower end of the valve cavity are respectively provided with an inflow channel and an outflow channel in a communicated mode. A pressure relief channel is arranged on one side of the upper end of the valve cavity in a communicating mode, a valve element is arranged in the valve cavity, an adjusting sleeve is arranged at the upper end in the valve cover, an adjusting column is fixedly arranged at the upper end of the valve element and inserted into the adjusting sleeve, and a high-elasticity spring is arranged outside the adjusting column in a sleeving mode. The upper end and the lower end of the high-elastic spring abut against the lower end face of the adjusting sleeve and the upper end face of the valve element respectively, a connecting column is fixedly arranged at the upper end of the adjusting sleeve, and the connecting column penetrates through the upper end of the valve deck and is fixedly connected with an adjusting structure. The safety value of the valve is not easy to change, the air pressure in the safety valve can quickly return to normal, and the valve core is not easy to impact the valve seat when returning.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, and more specifically to a pressure reducing safety valve for a natural gas pipeline. Background Art

[0002] Safety valves are special valves whose opening and closing parts are in a normally closed state under the action of external forces. When the medium pressure in the equipment or pipeline exceeds the preset value, the medium is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. Safety valves are automatic valves that control the pressure not to exceed the specified value, playing an important protective role in personal safety and equipment operation.

[0003] In the prior art, a corrosion-resistant lined safety valve with a publication number of CN220668488U is disclosed. The threaded rod is arranged to drive the connecting seat to move downward by rotation, thereby squeezing the spring to contract. The elastic potential energy of the spring after squeezing increases, so that the sealing valve core needs to be subjected to a greater pressure to connect the pressure-dividing chamber with the medium inlet, and vice versa. The process can easily adjust the pressure relief threshold of the safety valve according to the pressure relief requirements; however, the utility model still has the following problems: 1. The handle is directly exposed to the outside, and the staff may easily turn the handle by mistake to change the pressure of the spring, so that the safety value of the valve changes, and the safety of medium transportation is reduced. 2. When the pressure in the safety valve exceeds the safety value, when the pressure relief port is not exposed, the excessive medium in the safety valve will remain in the valve cavity, and it is difficult to discharge through the pressure relief port, and the air pressure is difficult to return to normal. When the pressure is too high, the excessive medium will be quickly discharged from the pressure relief port. When the air pressure is discharged to a certain value, the valve core moves downward to block the pressure relief port. At this time, the remaining excessive medium will be difficult to discharge, and the air pressure is difficult to return to normal. Therefore, the utility model proposes a natural gas pipeline pressure relief safety valve. Utility Model Content

[0004] The utility model aims to provide a natural gas pipeline pressure reducing safety valve, the safety value of the valve is not easy to change, the air pressure in the safety valve can quickly return to normal, and the valve core is not easy to hit the valve seat when returning to its original position.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A natural gas pipeline pressure reducing safety valve comprises a valve body and a valve cover fixed to the upper end of the valve body by bolts, wherein a valve cavity is arranged in the valve body, a valve seat is fixed in the valve cavity, an inflow channel and an outflow channel are respectively communicated with each other on the left and right sides of the lower end of the valve cavity, a pressure relief channel is communicated on one side of the upper end of the valve cavity, a valve core is arranged in the valve cavity, the lower end surface of the valve core abuts against the valve seat, an adjusting sleeve is arranged in the upper end of the valve cover, an adjusting column is fixedly arranged on the upper end of the valve core, the adjusting column is inserted into the adjusting sleeve, a high-elastic spring is arranged outside the adjusting column, the upper ends of the high-elastic spring abut against the lower end surface of the adjusting sleeve and the upper end surface of the valve core respectively, a connecting column is fixedly arranged on the upper end of the adjusting sleeve, the connecting column passes through the upper end of the valve cover and is fixedly connected to the adjusting structure, a fixing hole is arranged on the upper end of the adjusting structure, a column portion is inserted into the fixing hole, a handle is fixedly arranged on the upper end of the column portion, a flow port is arranged on one side of the lower end of the valve core, the lower end of the flow port abuts against the valve seat, and the upper end of the flow port communicates with the pressure relief channel.

[0007] By adopting the above technical solution, the utility model has the following advantages:

[0008] The arrangement of the fixing hole and the column of the utility model enables the handle to be installed when it is necessary to adjust the high-elastic spring pressure, and to be removed when it is not needed, which can effectively prevent the staff from accidentally touching the handle, resulting in an unexpected change in the safety value of the safety valve; the arrangement of the flow port of the utility model enables the valve core to move upward when the air pressure in the safety valve exceeds the safety value, regardless of the size of the excess, when the excess is too small, the flow port can be exposed, at this time, excessive gas will flow through the flow port to the pressure relief channel for discharge, during the discharge process, the air pressure can quickly and gradually return to normal, at this time the valve core can slowly return to its position, when the excess is too large, the pressure relief channel can be exposed, at this time excessive gas will be discharged through the pressure relief channel, when the air pressure gradually becomes smaller, it is discharged through the flow port again until the air pressure returns to normal, at this time the valve core can slowly return to its position, which can effectively prevent the valve core from colliding with the valve seat.

[0009] Furthermore, an annular slider is arranged around the upper end of the adjusting column, an annular slide groove is arranged on the inner side of the adjusting sleeve corresponding to the position of the annular slider, and the annular slider is clamped in the annular slide groove.

[0010] By adopting the above technical solution, the utility model has the following advantages:

[0011] The annular sliding block and the annular sliding groove of the utility model ensure that the regulating column will not be separated from the regulating sleeve, and the regulating column can move up and down in the regulating sleeve along with the up and down movement of the valve core.

[0012] Furthermore, the adjustment sleeve includes a top sleeve and a bottom cover, and the bottom cover is fixed to the lower end of the top sleeve by bolts.

[0013] By adopting the above technical solution, the utility model has the following advantages:

[0014] The arrangement of the top cover and the bottom cover of the utility model enables the adjusting column to be separated from the adjusting cover during maintenance and disassembly.

[0015] Furthermore, the adjustment structure includes a movable plate, semi-ring plates are fixedly provided on both sides of the movable plate, the inner sides of the semi-ring plates are provided with internal threaded surfaces, the outer upper ends of the valve covers are provided with external threaded surfaces, the internal threaded surfaces are threadedly connected to the external threaded surfaces, and the fixing holes are located at the upper ends of the movable plates.

[0016] By adopting the above technical solution, the utility model has the following advantages:

[0017] The arrangement of the semi-ring plate of the utility model enables the semi-ring plate to move up and down on the outer side of the valve cover when the movable plate rotates, thereby driving the connecting column to move downward, so that the adjusting sleeve moves downward to squeeze the high-elastic spring, thereby playing a role in adjusting the pressure of the high-elastic spring and realizing the change of the safety value of the safety valve.

[0018] Furthermore, the fixing hole comprises a main hole, and both sides of the main hole are connected with clamping holes, and the lower end of the column part matches the fixing hole.

[0019] By adopting the above technical solution, the utility model has the following advantages:

[0020] The arrangement of the main hole and the clamping hole of the utility model enables the rotation of the column part to drive the movable plate to rotate.

[0021] Furthermore, a bottom sleeve is fixedly provided at the lower end of the movable plate, and the upper end of the connecting column is inserted into the bottom sleeve and fixedly connected to the bottom sleeve by bolts.

[0022] By adopting the above technical solution, the utility model has the following advantages:

[0023] The provision of the bottom sleeve of the utility model plays the role of fixing and connecting the movable plate and the connecting column, and is also convenient for subsequent maintenance and disassembly.

[0024] Furthermore, a sealing ring 1 is embedded between the valve cover and the valve body, a sealing ring 2 is embedded on one side of the upper end of the valve core, and the outer side of the sealing ring 2 abuts against the valve body.

[0025] By adopting the above technical solution, the utility model has the following advantages:

[0026] The arrangement of the sealing ring 1 and the sealing ring 2 of the utility model strengthens the sealing performance between the valve body and the valve cover, and between the valve core and the valve body, and can effectively prevent leakage of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0029] Figure 2 For this utility model Figure 1 The enlarged structural diagram at A in the middle;

[0030] Figure 3 For this utility model Figure 1 Enlarged structural diagram at B in the middle.

[0031] Figure numerals: 1. valve body; 101. valve cavity; 102. inflow channel; 103. outflow channel; 104. pressure relief channel; 2. valve core; 201. flow port; 202. sealing ring 2; 3. top sleeve; 301. bottom cover; 302. annular slide groove; 4. adjusting column; 401. annular slider; 5. movable plate; 501. main hole; 502. clamping hole; 6. handle; 601. column; 7. valve seat; 8. high elastic spring; 9. sealing ring 1; 10. valve cover; 11. connecting column; 12. semi-ring plate; 13. bottom sleeve. DETAILED DESCRIPTION

[0032] like Figure 1 As shown, in the specific embodiment, the natural gas pipeline pressure reducing safety valve includes a valve body 1 and a valve cover 10 fixed to the upper end of the valve body 1 by bolts, a valve cavity 101 is provided in the valve body 1, a valve seat 7 is fixed in the valve cavity 101, an inflow channel 102 and an outflow channel 103 are respectively communicated on the left and right sides of the lower end of the valve cavity 101, a pressure relief channel 104 is communicated on one side of the upper end of the valve cavity 101, a valve core 2 is provided in the valve cavity 101, the lower end surface of the valve core 2 is against the valve seat 7, an adjusting sleeve is provided at the upper end of the valve cover 10, and an adjusting column 4 is fixed on the upper end of the valve core 2. The adjusting column 4 is inserted into the adjusting sleeve, and a high-elastic spring 8 is arranged on the outer sleeve of the adjusting column 4. The upper and lower ends of the high-elastic spring 8 are respectively abutted against the lower end surface of the adjusting sleeve and the upper end surface of the valve core 2. A connecting column 11 is fixedly arranged on the upper end of the adjusting sleeve. The connecting column 11 passes through the upper end of the valve cover 10 and is fixedly connected to the adjusting structure. A fixing hole is arranged on the upper end of the adjusting structure, and a column part 601 is inserted into the fixing hole. A handle 6 is fixedly arranged on the upper end of the column part 601. A flow port 201 is arranged on one side of the lower end of the valve core 2. The lower end of the flow port 201 is abutted against the valve seat 7, and the upper end of the flow port 201 is communicated with the pressure relief channel 104.

[0033] Through the above settings, the settings of the fixing hole and the column 601 of the utility model enable the handle 6 to be installed when the pressure of the high-elastic spring 8 needs to be adjusted, and to be removed when it is not needed, which can effectively prevent the staff from accidentally touching the handle 6, resulting in an unexpected change in the safety value of the safety valve; the setting of the flow port 201 of the utility model enables the valve core 2 to move upward when the air pressure in the safety valve exceeds the safety value, regardless of the size of the excess, when the excess is too small, the flow port 201 can be exposed, at this time, excessive gas will flow through the flow port 201 to the pressure relief channel 104 for discharge, during the discharge process, the air pressure can quickly and gradually return to normal, at this time the valve core 2 can slowly return to its position, when the excess is too large, the pressure relief channel 104 can be exposed, at this time excessive gas will be discharged through the pressure relief channel 104, when the air pressure gradually becomes smaller, it is discharged through the flow port 201 again until the air pressure returns to normal, at this time the valve core 2 can slowly return to its position, which can effectively prevent the valve core 2 from colliding with the valve seat 7.

[0034] like Figure 1 to Figure 2 As shown, an annular slider 401 is arranged around the upper end of the adjusting column 4, an annular slide groove 302 is arranged on the inner side of the adjusting sleeve corresponding to the position of the annular slider 401, and the annular slider 401 is clamped in the annular slide groove 302; the adjusting sleeve includes a top sleeve 3 and a bottom cover 301, and the bottom cover 301 is fixed to the lower end of the top sleeve 3 by bolts.

[0035] Through the above settings, the settings of the annular slider 401 and the annular groove 302 of the utility model ensure that the adjusting column 4 will not separate from the adjusting sleeve, and the adjusting column 4 can move up and down in the adjusting sleeve as the valve core 2 moves up and down; the settings of the top sleeve 3 and the bottom cover 301 of the utility model ensure that the adjusting column 4 can be separated from the adjusting sleeve during maintenance and disassembly.

[0036] like Figure 1 and Figure 3 As shown, the regulating structure includes a movable plate 5, semi-ring plates 12 are fixedly provided on both sides of the movable plate 5, and internal threaded surfaces are provided on the inner sides of the semi-ring plates 12. External threaded surfaces are provided on the upper outer ends of the valve cover 10, and the internal threaded surfaces are threadedly connected with the external threaded surfaces, and the fixing holes are located at the upper end of the movable plate 5; the fixing holes include a main hole 501, and clamping holes 502 are provided on both sides of the main hole 501, and the lower end of the column 601 matches the fixing holes; a bottom sleeve 13 is fixedly provided at the lower end of the movable plate 5, and the upper end of the connecting column 11 is inserted into the bottom sleeve 13 and fixedly connected with the bottom sleeve 13 by bolts; a sealing ring 9 is embedded between the valve cover 10 and the valve body 1, and a sealing ring 202 is embedded on one side of the upper end of the valve core 2, and the outer side of the sealing ring 202 is against the valve body 1.

[0037] Through the above settings, the setting of the semi-ring plate 12 of the utility model enables the semi-ring plate 12 to move up and down on the outside of the valve cover 10 when the movable plate 5 rotates, thereby driving the connecting column 11 to move downward, so that the adjusting sleeve moves downward to squeeze the high-elastic spring 8, thereby playing a role in adjusting the pressure of the high-elastic spring 8 and realizing the change of the safety value of the safety valve; the setting of the main hole 501 and the clamping hole 502 of the utility model enables the rotation of the column part 601 to drive the movable plate 5 to rotate; the setting of the bottom sleeve 13 of the utility model plays a role in fixing and connecting the movable plate 5 and the connecting column 11, and is also convenient for subsequent maintenance and disassembly; the setting of the sealing ring 1 9 and the sealing ring 2 202 of the utility model strengthens the sealing between the valve body 1 and the valve cover 10, and the valve core 2 and the valve body 1, which can effectively prevent medium leakage.

[0038] Working principle: When in use, the gas flows from the inflow channel 102 to the outflow channel 103. When the air pressure exceeds the safety value within a certain range, the valve core 2 can be pushed to move upward. When the valve core 2 moves upward, one end of the flow port 201 is exposed. At this time, the excess gas is discharged from the flow port 201 to the pressure relief channel 104 until the air pressure returns to normal. The high-elastic spring 8 will push the valve core 2 back to its original position. When the air pressure exceeds the safety value too much, the flow port 201 cannot discharge the gas. The valve core 2 will move further upward until the pressure relief channel 104 is exposed. At this time, the excess gas will be directly discharged from the pressure relief channel 104. When the air pressure gradually increases, the valve core 2 will move upward to the pressure relief channel 104. When it gradually returns to normal, the valve core 2 can slowly move downward until the air pressure returns to normal through the flow port 201, and the valve core 2 can return to its original position. When the pressure of the high-elastic spring 8 is adjusted, the lower end of the column 601 can be inserted into the main hole 501 and the clamping hole 502, and the movable plate 5 can be rotated by rotating the handle 6 to make the semi-ring plate 12 move downward, drive the connecting column 11 to move downward, and squeeze the top sleeve 3 to move downward, so as to change the pressure of the high-elastic spring 8, thereby changing the safety value of the air pressure; the high-elastic spring 8, sealing ring 1 9 and sealing ring 2 202 of the present application are disclosed in the prior art, so this application will not go into too much detail.

[0039] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A natural gas pipeline pressure relief safety valve, comprising a valve body (1) and a valve cover (10) fixed to the upper end of the valve body (1) by bolts, wherein a valve cavity (101) is provided in the valve body (1), and a valve seat (7) is fixedly provided in the valve cavity (101), characterized in that: The left and right sides of the lower end of the valve cavity (101) are respectively connected to each other and are provided with an inflow channel (102) and an outflow channel (103); the upper end of the valve cavity (101) is connected to one side and is provided with a pressure relief channel (104); a valve core (2) is provided in the valve cavity (101); the lower end surface of the valve core (2) abuts against the valve seat (7); an adjustment sleeve is provided at the upper end of the valve cover (10); an adjustment column (4) is fixedly provided at the upper end of the valve core (2); the adjustment column (4) is inserted into the adjustment sleeve; a high-elasticity spring (8) is provided on the outer sleeve of the adjustment column (4); the upper and lower ends of the high-elasticity spring (8) are respectively connected to the valve seat (7); The lower end surface of the adjustment sleeve abuts against the upper end surface of the valve core (2); a connecting column (11) is fixedly provided on the upper end of the adjustment sleeve; the connecting column (11) passes through the upper end of the valve cover (10) and is fixedly connected to the adjustment structure; a fixing hole is provided on the upper end of the adjustment structure; a column (601) is inserted into the fixing hole; a handle (6) is fixedly provided on the upper end of the column (601); a flow port (201) is provided on one side of the lower end of the valve core (2); the lower end of the flow port (201) abuts against the valve seat (7); and the upper end of the flow port (201) communicates with the pressure relief channel (104).

2. The natural gas pipeline pressure reducing safety valve according to claim 1, characterized in that: An annular sliding block (401) is arranged around the upper end of the adjusting column (4), an annular sliding groove (302) is arranged on the inner side of the adjusting sleeve at a position corresponding to the annular sliding block (401), and the annular sliding block (401) is clamped in the annular sliding groove (302).

3. The natural gas pipeline pressure reducing safety valve according to claim 2, characterized in that: The adjustment sleeve comprises a top sleeve (3) and a bottom cover (301), and the bottom cover (301) is fixed to the lower end of the top sleeve (3) by means of bolts.

4. The natural gas pipeline pressure reducing safety valve according to claim 1, characterized in that: The regulating structure comprises a movable plate (5), half-ring plates (12) are fixedly provided on both sides of the movable plate (5), the inner sides of the half-ring plates (12) are provided with internal threaded surfaces, the upper ends of the outer sides of the valve covers (10) are provided with external threaded surfaces, the internal threaded surfaces are threadedly connected to the external threaded surfaces, and the fixing holes are located at the upper ends of the movable plates (5).

5. The natural gas pipeline pressure reducing safety valve according to claim 4, characterized in that: The fixing hole comprises a main hole (501), both sides of the main hole (501) are connected with clamping holes (502), and the lower end of the column part (601) matches the fixing hole.

6. The natural gas pipeline pressure reducing safety valve according to claim 5, characterized in that: A bottom sleeve (13) is fixedly provided at the lower end of the movable plate (5), and the upper end of the connecting column (11) is inserted into the bottom sleeve (13) and fixedly connected to the bottom sleeve (13) by bolts.

7. The natural gas pipeline pressure reducing safety valve according to claim 1, characterized in that: A sealing ring 1 (9) is embedded between the valve cover (10) and the valve body (1), and a sealing ring 2 (202) is embedded on one side of the upper end of the valve core (2), and the outer side of the sealing ring 2 (202) abuts against the valve body (1).

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