A high-pressure steam safety valve

Abstract

The present invention belongs to the technical field of safety valves, and specifically relates to a high-pressure steam safety valve, comprising a valve body and a valve cover fixedly mounted on the valve body. The valve body has a valve port defined at its bottom, a ball valve mounted within the valve port, a second through hole vertically defined in the ball valve, and third and fourth through holes transversely defined in the ball valve, the centerline of the third through hole being perpendicular to the centerline of the fourth through hole. The valve body has a fifth through hole positioned on one side of the fourth through hole, a test tube mounted within the fifth through hole, and a sealing unit disposed between the test tube and the fourth through hole. The purpose of the present invention is to facilitate inspection of the safety valve by enabling the ball valve, the sealing unit, and the test tube to be coordinated with each other, so that when the safety valve is inspected, the ball valve can be rotated 90° counterclockwise, the third through hole communicating with the valve seat, the second through hole being sealed, the sealing unit opened, water injected through the test tube, and the exhaust port observed for liquid overflow, thereby determining whether the sealing surface is worn. This eliminates the need for disassembly of the valve body, making inspection more convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of safety valves, and in particular relates to a high-pressure steam safety valve. Background Art

[0002] A safety valve is a special valve whose opening and closing components remain normally closed under external forces. When the pressure of the medium in the equipment or pipeline rises above a specified value, it discharges the medium to the outside of the system to prevent the pressure inside the pipeline or equipment from exceeding the specified value. Safety valves are automatic valves primarily used in boilers, pressure vessels, and pipelines to control pressure to within a specified value, playing a vital role in protecting personnel and equipment operation.

[0003] During long-term use, the sealing surface between the valve core and the valve seat of the safety valve will wear, causing the trigger pressure value of the pressure relief to increase and causing the medium in the pressure vessel to leak continuously. Therefore, regular inspection and maintenance of the valve is required.

[0004] For safety valves used in steam pipelines, steam will continue to leak after the sealing surface is worn, but the leakage amount is small and difficult to observe. The valve body and valve core need to be disassembled for inspection, which makes the inspection work cumbersome, time-consuming and labor-intensive. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-pressure steam safety valve to solve the technical problem that after the sealing surface of the safety valve on the steam pipeline is worn, steam will continue to leak, but the leakage amount is small and difficult to observe. The valve body and valve core need to be disassembled for inspection, which makes the inspection work cumbersome, time-consuming and labor-intensive.

[0006] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0007] A high-pressure steam safety valve comprises a valve body and a valve cover fixedly mounted on the valve body, a steam exhaust port is formed at the lower end of the side wall of the valve body, a valve port is formed at the bottom of the valve body, a first through hole is formed at the top of the valve body, a valve cylinder is mounted in the first through hole, a valve stem is passed through the valve cylinder, a valve port is formed at the bottom of the valve body, a valve seat is mounted at the top of the valve port, a valve core is mounted in the valve cylinder, a first spring seat is mounted above the valve cylinder on the valve cover, a second spring seat is provided above the first spring seat on the valve cover, a spring is mounted between the first spring seat and the second spring seat, and the first spring seat and the second spring seat are both sleeved on the valve stem. The valve stem is provided with a limit block at the bottom of the first spring seat, and the valve stem is sleeved with an adjusting cover above the second spring seat. The adjusting cover is threadedly connected to the valve body. A ball valve is installed in the valve port of the valve body, and a second through hole is vertically provided on the ball valve. A third through hole and a fourth through hole are horizontally provided on the ball valve. The center line of the third through hole is perpendicular to the center line of the fourth through hole. The valve body is provided with a fifth through hole on one side of the fourth through hole. A test tube is installed in the fifth through hole. A closing unit is provided between the test tube and the fourth through hole. The closing unit is used to control the opening and closing of the test tube. After the ball valve is rotated 90° counterclockwise, the third through hole is connected to the valve seat.

[0008] It is further defined that the sealing unit includes a sealing cover and a sealing cylinder, the sealing cylinder is fixedly connected in the fourth through hole, the sealing cover is fixedly connected to one end of the test tube close to the sealing cylinder, the sealing cover is against the sealing cylinder, the sealing cover is provided with a sixth through hole, the sealing cylinder is provided with a seventh through hole, and after the ball valve is rotated 90° counterclockwise, the sixth through hole is connected to the seventh through hole. With this structural design, when no maintenance is performed, the sixth through hole and the seventh through hole are misaligned and the sixth through hole is closed, and when maintenance is performed, the ball valve is rotated 90° counterclockwise and the sixth through hole is connected. Water can be injected into the valve seat through the test tube. When there is a gap between the valve seat and the valve core, liquid will seep out, making detection more convenient without disassembling the valve body.

[0009] It is further defined that the valve body is provided with a water storage tank, which is connected to the test tube. Such a structural design facilitates water filling during testing and observation of the drop in the water level by providing the water storage tank.

[0010] The valve body is further defined as having an eighth through-hole formed on one side of the water reservoir, the eighth through-hole being located above the valve seat, the water reservoir being connected to the valve body via the eighth through-hole, and a plastic film being fixedly attached to the top of the water reservoir. With this structural design, steam generated by valve body pressure relief enters the water reservoir through the eighth through-hole, where it condenses on the plastic film as condensed water and flows into the water reservoir. During maintenance, a test tube is connected to observe the drop in the liquid level, thereby determining whether the sealing surface is intact and facilitating inspection of the sealing surface.

[0011] It is further defined that the side wall of the water storage tank is provided with a water injection hole, and the water storage tank is installed with a sealing plug at the water injection hole. With such a structural design, when the liquid in the water storage tank is insufficient, the sealing plug can be removed and water can be injected through the water injection hole.

[0012] Furthermore, the inner sidewall of the valve cover is provided with a guide groove, and the first spring seat is fixedly connected to a guide plate within the guide groove. This structural design, by providing the guide groove, prevents the first spring seat from rotating, which could cause the spring to twist, thereby changing the pressure of the spring on the valve core and causing changes in the opening and closing pressure values of the safety valve.

[0013] Furthermore, a limit slot is defined in the first spring seat. With this structural design, the valve stem can be rotated so that the limit block aligns with the limit slot, freeing the valve stem from the first spring seat. The valve stem can then be pulled upward to detect whether the valve core is blocked, saving effort.

[0014] It is further defined that a connecting cylinder is rotatably mounted on the top end of the valve cover, and a top cover is screwed onto the top end of the connecting cylinder. Such a structural design facilitates the installation of the safety valve by providing the connecting cylinder and the top cover.

[0015] The invention adopting the above technical solution has the following advantages:

[0016] 1. Through the cooperation of the ball valve, the sealing unit and the test tube, when the safety valve is inspected, the ball valve is rotated 90° counterclockwise, the third through hole is connected to the valve seat, the second through hole is closed, the sealing unit is opened, water is injected through the test tube, and whether there is liquid overflow from the exhaust port is observed, thereby judging whether the sealing surface is worn. There is no need to disassemble the valve body, and the inspection is more convenient.

[0017] 2. Through the cooperation between the sealing cover and the sealing cylinder, when no maintenance is performed, the sixth through hole and the seventh through hole are misaligned and the sixth through hole is closed. When maintenance is performed, the ball valve is rotated 90° counterclockwise to connect the sixth through hole. When the ball valve is rotated, the test tube is automatically connected, which is more convenient to use.

[0018] 3. The steam generated by the pressure relief of the valve body enters the water storage tank through the eighth through hole. The steam condenses into condensed water on the plastic film and flows into the water storage tank. During maintenance, the test pipe is connected to observe the drop of the liquid level, so as to judge whether the sealing surface is intact and facilitate the inspection of the sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0020] Figure 1 This is a schematic structural diagram of an embodiment of a high-pressure steam safety valve of the present invention;

[0021] Figure 2 A cross-sectional view of an embodiment of a high-pressure steam safety valve of the present invention;

[0022] Figure 3 It is a cross-sectional view of the other side of an embodiment of a high-pressure steam safety valve of the present invention;

[0023] Figure 4 for Figure 3 Enlarged structural diagram at point A.

[0024] The main component symbols are described as follows:

[0025] Valve body 1, exhaust port 11, valve port 12, valve cylinder 13, valve seat 14, eighth through hole 15,

[0026] Valve cover 2, first spring seat 21, limiting groove 211, guide plate 212, second spring seat 22, spring 23, guide groove 24,

[0027] Valve stem 3, valve core 31, limit block 32, adjustment cover 33, connecting tube 34, top cover 35,

[0028] Ball valve 4, second through hole 41, third through hole 42, fourth through hole 43, test tube 44, sealing cover 45, sixth through hole 451, sealing cylinder 46, seventh through hole 461,

[0029] Water storage tank 5, sealing plug 51. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions, similar or identical parts are numbered the same. Implementations not shown or described in the drawings are forms known to those of ordinary skill in the art. In addition, directional terms mentioned in the embodiments, such as "upper," "lower," "top," "bottom," "left," "right," "front," and "back," are merely references to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0031] like Figures 1 to 4As shown, a high-pressure steam safety valve of the present invention is characterized in that it includes a valve body 1 and a valve cover 2 fixedly installed on the valve body 1, a steam exhaust port 11 is opened at the lower end of the side wall of the valve body 1, a valve port 12 is opened at the bottom of the valve body 1, a first through hole is opened at the top of the valve body 1, a valve cylinder 13 is installed in the valve body 1 in the first through hole, a valve stem 3 is passed through the valve cylinder 13, a valve port 12 is provided at the bottom of the valve body 1, a valve seat 14 is installed at the top of the valve port 12, a valve core 31 is installed in the valve cylinder 13 of the valve stem 3, a first spring seat 21 is installed above the valve cylinder 13 of the valve cover 2, a second spring seat 22 is provided above the first spring seat 21 of the valve cover 2, a spring 23 is installed between the first spring seat 21 and the second spring seat 22, and a spring 23 is installed between the first spring seat 21 and the second spring seat 22. 2 are both sleeved on the valve stem 3. The valve stem 3 is provided with a limit block 32 at the bottom of the first spring seat 21. The valve stem 3 is sleeved with an adjusting cover 33 above the second spring seat 22. The adjusting cover 33 is threadedly connected to the valve body 1. The valve body 1 is provided with a ball valve 4 in the valve port 12. The ball valve 4 is vertically provided with a second through hole 41. The ball valve 4 is horizontally provided with a third through hole 42 and a fourth through hole 43. The center line of the third through hole 42 is perpendicular to the center line of the fourth through hole 43. The valve body 1 is provided with a fifth through hole on one side of the fourth through hole 43. A test tube 44 is installed in the fifth through hole. A closing unit is provided between the test tube 44 and the fourth through hole 43. The closing unit is used to control the opening and closing of the test tube 44. After the ball valve 4 is rotated 90° counterclockwise, the third through hole 42 is connected to the valve seat 14.

[0032] In this embodiment, the valve cover 2 is mounted on the valve body 1 by bolts, and the first spring seat 21 and the second spring seat 22 both slide along the inner wall of the valve cover 2. The length of the spring 23 can be adjusted by rotating the adjusting cover 33, thereby adjusting the opening and closing pressure value of the safety valve; the test tube 44 can be a transparent pipe, and a scale line is set on the outer wall of the pipe to facilitate observation of the liquid level drop.

[0033] like Figure 4 As shown, the sealing unit includes a sealing cover 45 and a sealing cylinder 46. The sealing cylinder 46 is fixedly connected to the fourth through hole 43. The sealing cover 45 is fixedly connected to the end of the test tube 44 near the sealing cylinder 46. The sealing cover 45 rests on the sealing cylinder 46. The sealing cover 45 has a sixth through hole 451, and the sealing cylinder 46 has a seventh through hole 461. After the ball valve 4 is rotated 90 degrees counterclockwise, the sixth through hole 451 is connected to the seventh through hole 461. Due to the mutual cooperation between the sealing cover 45 and the sealing cylinder 46, when not undergoing maintenance, the sixth through hole 451 and the seventh through hole 461 are misaligned, and the sixth through hole 451 is blocked. When undergoing maintenance, the ball valve 4 is rotated 90 degrees counterclockwise, and the sixth through hole 451 is connected. Water can be injected into the valve seat 14 through the test tube 44. When a gap exists between the valve seat 14 and the valve core 31, liquid will seep out, making inspection more convenient without disassembling the valve body 1.

[0034] like Figure 3 As shown, a water storage tank 5 is provided on the valve body 1, and the water storage tank 5 is communicated with the test pipe 44. By providing the water storage tank 5, it is convenient to fill water during testing and observe the drop of the water level.

[0035] like Figure 3 As shown, the valve body 1 has an eighth through hole 15 on one side of the water reservoir 5. The eighth through hole 15 is located above the valve seat 14. The water reservoir 5 is connected to the valve body 1 through the eighth through hole 15. A plastic film is fixedly connected to the top of the water reservoir 5. Steam generated by the pressure relief of the valve body 1 enters the water reservoir 5 through the eighth through hole 15. The steam condenses on the plastic film and becomes condensed water, which flows into the water reservoir 5. During maintenance, the test tube 44 is connected to observe the drop in the liquid level, thereby determining whether the sealing surface is intact, which facilitates the inspection of the sealing surface.

[0036] like Figure 3 As shown, the sidewall of the water storage tank 5 is provided with a water injection hole, and the water storage tank 5 is installed with a sealing plug 51 at the water injection hole. When the liquid in the water storage tank 5 is not enough, the sealing plug 51 can be removed and water can be injected through the water injection hole.

[0037] like Figure 2 As shown, the inner wall of the valve cover 2 is provided with a guide groove 24, and the first spring seat 21 is fixedly connected to a guide plate 212 within the guide groove 24. The provision of the guide groove 24 prevents the first spring seat 21 from rotating, which would cause the spring 23 to twist, thereby causing the pressure of the spring 23 on the valve core 31 to change, resulting in changes in the opening and closing pressure values of the safety valve.

[0038] like Figure 2 As shown, a limit slot 211 is provided in the first spring seat 21. The valve stem 3 can be rotated so that the limit block 32 is aligned with the limit slot 211, so that the valve stem 3 is no longer blocked by the first spring seat 21. The valve stem 3 can be pulled upward to detect whether the valve core 31 is blocked, which is more labor-saving.

[0039] like Figure 2 As shown, the top end of the valve cover 2 is rotatably mounted with a connecting cylinder 34, and the top end of the connecting cylinder 34 is screwed with a top cover 35. By providing the connecting cylinder 34 and the top cover 35, it is convenient to install the safety valve.

[0040] In this embodiment, an indicator mark can be set on the adjusting rod to facilitate the rotation of the valve stem 3 so that the limit block 32 is aligned with the limit groove 211. After the inspection is completed, the valve stem 3 is rotated again so that the limit block 32 is blocked by the limit plate again.

[0041] The usage and principle of this embodiment are as follows:

[0042] When the steam system is working, steam enters through the bottom of the valve port 12, passes through the second through hole 41 and enters the valve seat 14. When the steam pressure exceeds a preset value, the valve core 31 is lifted, and the valve core 31 moves upward along the inner wall of the valve cylinder 13, driving the valve stem 3 to move upward. The valve stem 3 lifts the first spring seat 21 through the limit block 32 and compresses the spring 23. After the valve core 31 is separated from the valve seat 14, the pressure is released, and the steam enters the valve body 1 and is discharged from the exhaust port 11. Part of the steam enters the water storage tank 5 through the eighth through hole 15 and forms condensed water on the plastic film. After the pressure is released, the valve core 31 is closed again due to the elastic force of the spring 23.

[0043] When testing the sealing surface, the steam system stops working, the ball valve 4 rotates 90° counterclockwise, the two ends of the second through hole 41 are closed by the valve body 1, the third through hole 42 faces upward, the bottom of the valve port 12 is closed, and the sealing cylinder 46 rotates with the ball valve 4. The sixth through hole 451 is connected, and the water in the water storage tank 5 enters the ball valve 4 through the test tube 44 and fills the valve seat 14. The liquid level in the water storage tank 5 drops rapidly. After the valve seat 14 is filled, the liquid level in the water storage tank 5 remains unchanged. When the sealing surface is worn, the liquid level in the water storage tank 5 will continue to drop slowly, thereby judging whether the sealing surface is damaged. When the liquid in the water storage tank 5 is less, the sealing plug 51 can be removed and water can be injected through the water injection hole;

[0044] When testing the valve core 31, rotate the valve stem 3 until the limit block 32 is aligned with the limit groove 211, so that the valve stem 3 loses the obstruction of the first spring seat 21. The valve stem 3 can be pulled upward to test whether the valve core 31 is blocked, which is more labor-saving.

[0045] The above describes in detail the high-pressure steam safety valve provided by the present invention. The description of the specific embodiments is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art will be able to make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the claims.

Claims

1. A high-pressure steam safety valve, characterized in that: The invention comprises a valve body (1) and a valve cover (2) fixedly mounted on the valve body (1), wherein a steam exhaust port (11) is provided at the lower end of the side wall of the valve body (1), a valve port (12) is provided at the bottom of the valve body (1), a first through hole is provided at the top of the valve body (1), a valve cylinder (13) is installed in the first through hole of the valve body (1), a valve stem (3) is passed through the valve cylinder (13), a valve seat (14) is installed at the top of the valve port (12), a valve stem (3) is installed in the valve cylinder (13), and a valve core (31) is installed in the valve cylinder (13), and a first spring seat (21) is installed above the valve cylinder (13). ), the valve cover (2) is provided with a second spring seat (22) above the first spring seat (21), a spring (23) is installed between the first spring seat (21) and the second spring seat (22), the first spring seat (21) and the second spring seat (22) are both sleeved on the valve stem (3), the valve stem (3) is provided with a limit block (32) at the bottom of the first spring seat (21), the valve stem (3) is sleeved with an adjusting cover (33) above the second spring seat (22), the adjusting cover (33) is threadedly connected to the valve body (1); the valve body (1) is provided with a ball valve ( 4), a second through hole (41) is vertically provided on the ball valve (4), a third through hole (42) and a fourth through hole (43) are horizontally provided on the ball valve (4), the center line of the third through hole (42) is perpendicular to the center line of the fourth through hole (43), the valve body (1) is provided with a fifth through hole on one side of the fourth through hole (43), a test tube (44) is installed in the fifth through hole, a closing unit is provided between the test tube (44) and the fourth through hole (43), the closing unit is used to control the opening and closing of the test tube (44), after the ball valve (4) is rotated 90° counterclockwise, the third through hole (4 2) communicated with the valve seat (14); the sealing unit includes a sealing cover (45) and a sealing cylinder (46), the sealing cylinder (46) is fixedly connected in the fourth through hole (43), the sealing cover (45) is fixedly connected to one end of the test tube (44) close to the sealing cylinder (46), the sealing cover (45) is pressed against the sealing cylinder (46), a sixth through hole (451) is provided on the sealing cover (45), and a seventh through hole (461) is provided on the sealing cylinder (46), and after the ball valve (4) is rotated 90° counterclockwise, the sixth through hole (451) is communicated with the seventh through hole (461).

2. A high-pressure steam safety valve according to claim 1, characterized in that: A water storage tank (5) is provided on the valve body (1), and the water storage tank (5) is connected to the test tube (44).

3. A high-pressure steam safety valve according to claim 2, characterized in that: The valve body (1) is provided with an eighth through hole (15) on one side of the water storage tank (5). The eighth through hole (15) is located above the valve seat (14). The water storage tank (5) is communicated with the valve body (1) through the eighth through hole (15). A plastic film is fixedly connected to the top of the water storage tank (5).

4. A high-pressure steam safety valve according to claim 3, characterized in that: A water injection hole is provided on the side wall of the water storage tank (5), and a sealing plug (51) is installed in the water injection hole of the water storage tank (5).

5. A high-pressure steam safety valve according to claim 1, characterized in that: The inner side wall of the valve cover (2) is provided with a guide groove (24), and the first spring seat (21) is fixedly connected to a guide plate (212) in the guide groove (24).

6. A high-pressure steam safety valve according to claim 1, characterized in that: A limiting through slot (211) is provided in the first spring seat (21).

7. A high-pressure steam safety valve according to claim 1, characterized in that: A connecting cylinder (34) is rotatably mounted on the top end of the valve cover (2), and a top cover (35) is screwed onto the top end of the connecting cylinder (34).

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