Natural gas emergency shut-off valve

Abstract

The present invention provides a natural gas emergency shut-off valve, comprising a valve body, a middle barrel and a valve cover. The valve cover is arranged above the middle barrel, the valve body is arranged below the middle barrel, the valve body and the valve cover are both connected to the middle barrel, a valve cavity is formed inside the valve body, a feed port and a discharge port are arranged on both sides of the valve cavity, a valve seat and a valve core are arranged in the valve cavity, a valve stem is arranged on the valve cover, the valve stem penetrates the valve cover and the middle barrel, extends into the valve cavity and is connected to the valve core, a stuffing groove is formed between the valve cover and the valve stem, stuffing is arranged in the stuffing groove, a bellows component is arranged on the valve stem, the bellows component is connected to the valve stem, an installation cavity is formed between the valve core and the valve body, a sleeve is arranged in the installation cavity, one side of the sleeve is connected to the inner wall of the valve body, and the other side is connected to the valve core, the sleeve and the valve core form a sealing cavity, a sealing component is arranged in the sealing cavity, a valve seat is arranged in the valve cavity, and a sealing ring is arranged between the valve seat and the valve body and the valve core.

Description

Technical Field

[0001] The present invention relates to the field of valves, and in particular to a natural gas emergency shut-off valve. Background Art

[0002] Environmental pollution and energy crisis have become two major problems in today's society. In recent years, large-scale haze weather has continued to occur across the country. Coal-fired boilers, transportation, and heavily polluting enterprises have instantly become the targets of public criticism. Highly polluting coal has been labeled black, and people have turned their attention to clean and efficient natural gas. According to the "12th Five-Year Plan for Natural Gas Development", it is clearly proposed to "increase the proportion of natural gas in the primary energy consumption structure". Natural gas produces extremely few substances that can affect the health of the human respiratory system during the combustion process. The carbon dioxide produced is only about 40% of that of coal, and the sulfur dioxide produced is also very little. After natural gas burns, there is no waste residue or wastewater generated. Compared with energy sources such as coal and oil, it has the advantages of safe use, high calorific value, and cleanliness. Therefore, it is an urgent problem to design a natural gas filling pressure type quick shut-off valve to reduce and avoid the emission of natural gas without affecting the filling operation. Summary of the Invention

[0003] In view of this, the present invention provides a natural gas emergency shut-off valve.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A natural gas emergency shut-off valve includes a valve body, a middle barrel, and a valve cover. The valve cover is arranged above the middle barrel, and the valve body is arranged below the middle barrel. Both the valve body and the valve cover are connected to the middle barrel. A valve cavity is formed inside the valve body. An inlet and an outlet are arranged on both sides of the valve cavity. A valve seat and a valve core are arranged inside the valve cavity. A valve rod is arranged on the valve cover. The valve rod penetrates through the valve cover and extends into the middle barrel and then into the valve cavity to be connected with the valve core. A stuffing box is formed between the valve cover and the valve rod. Packing is arranged inside the stuffing box. A bellows component is arranged on the valve rod. The bellows component is connected to the valve rod. An installation cavity is formed between the valve core and the valve body. A sleeve is arranged inside the installation cavity. One side of the sleeve is connected to the inner wall of the valve body, and the other side is connected to the valve core. A sealing cavity is formed between the sleeve and the valve core. A sealing component is arranged inside the sealing cavity. A valve seat is arranged inside the valve cavity. Sealing rings are arranged between the valve seat and the valve body and the valve core.

[0006] Preferably, the sealing component includes a sealing pressing plate. An upper Grilon ring and a lower Grilon ring are arranged on the sealing pressing plate. A sealing groove is formed between the sealing pressing plate and the sleeve. An O-ring is arranged inside the sealing groove. The O-ring connects the sleeve and the sealing pressing plate. The upper Grilon ring, the O-ring, and the lower Grilon ring are arranged on the sealing pressing plate from top to bottom in sequence.

[0007] Preferably, a sealing gland is arranged above the sealing pressing plate and the valve core. An upper ring groove is formed on the sealing gland. A lower ring groove is arranged on the side of the valve core close to the sleeve. High-performance sealing rings are arranged in both the upper ring groove and the lower ring groove. Corresponding screw holes are arranged between the sealing gland and the valve core. The sealing gland and the valve core are fixedly connected by screws.

[0008] Preferably, a notch is formed on the side of the valve body in contact with the sleeve. The sleeve protrudes correspondingly to form an abutting block. A serrated gasket is arranged between the abutting block and the notch.

[0009] Preferably, one end of the bellows component is fixedly connected to the valve stem, and the other end of the bellows component is fixedly connected to the valve cover.

[0010] Preferably, the packing is a V-shaped packing. A U-shaped groove is arranged on the V-shaped packing. A spring is arranged below the packing. One end of the spring abuts against the packing, and the other end of the spring is connected to the bottom wall of the packing groove.

[0011] Preferably, a packing gland is arranged above the packing. A sealing ring groove is formed on the packing gland. An O-ring is arranged in the sealing ring groove. And a dust-proof sealing ring is arranged between the packing gland and the packing.

[0012] Preferably, a lock washer is arranged between the screw and the sealing gland. The lock washer is composed of an upper washer and a lower washer. Corresponding serrated surfaces are arranged on the upper washer and the lower washer. The serrated surface of the upper washer is meshed and connected with the serrated surface of the lower washer.

[0013] Preferably, a valve body sealing groove is formed at the connection between the valve body and the valve seat. A valve body sealing ring is arranged in the valve body sealing groove. A graphite gasket is also arranged above the valve body sealing ring. The graphite gasket is arranged between the valve body and the valve seat.

[0014] The beneficial effects of the present invention are as follows: The high-performance sealing ring, star-shaped ring, and O-ring are arranged to ensure the forward sealing of the valve. The high-performance sealing ring, star-shaped ring, and O-ring are arranged to ensure the reverse sealing of the valve. The Gleason ring is mainly used for guiding the valve core, reducing the wear of the high-performance sealing ring during the movement process, and can also play a certain sealing effect. The bellows sealing structure is adopted, which can completely eliminate the possibility of process medium leaking out from the movement gap of the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Appendix Figure 1 is a schematic structural diagram of the present invention;

[0017] Appendix Figure 2 is an enlarged view of part B in Appendix Figure 1 ;

[0018] Appendix Figure 3 is an enlarged view of part A in Appendix Figure 1 . Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Next, the present invention will be further described in conjunction with the accompanying drawings of the specification.

[0021] The present invention provides the following technical solutions:

[0022] As shown in Appendix Figures 1 to 3 , the present invention discloses a natural gas emergency shut-off valve, which includes a valve body 1, a middle barrel, and a valve cover 11. The valve cover 11 is arranged above the middle barrel, the valve body 1 is arranged below the middle barrel, both the valve body 1 and the valve cover 11 are connected to the middle barrel. A valve cavity 22 is formed inside the valve body 1. An inlet 23 and an outlet 24 are arranged on both sides of the valve cavity 22. A valve seat 3 and a valve core 4 are arranged in the valve cavity 22. A valve rod 15 is arranged on the valve cover 11. The valve rod 15 penetrates through the valve cover 11 and extends into the valve cavity 22 through the middle barrel to be connected to the valve core 4. A stuffing box 25 is formed between the valve cover 11 and the valve rod 15. A packing 12 is arranged in the stuffing box 25. A bellows component 10 is arranged on the valve rod 15. The bellows component 10 is connected to the valve rod 15. An installation cavity 26 is formed between the valve core 4 and the valve body 1. A sleeve 5 is arranged in the installation cavity 26. One side of the sleeve 5 is connected to the inner wall of the valve body 1, and the other side is connected to the valve core 4. A sealing cavity (not shown in the figure) is formed between the sleeve 5 and the valve core 4. A sealing component is arranged in the sealing cavity. A valve seat 3 is arranged in the valve cavity 22. A sealing ring 28 is arranged between the valve seat 3, the valve body 1, and the valve core 4.

[0023] A sealing component is provided to achieve better sealing effect. The sealing component includes a sealing pressing plate 29, on which an upper Gland ring 8 and a lower Gland ring 81 are arranged. A sealing groove 30 is formed between the sealing pressing plate 29 and the sleeve 5. An O-ring 31 is arranged in the sealing groove 30, which connects the sleeve 5 and the sealing pressing plate 29. The upper Gland ring 8, the O-ring 31, and the lower Gland ring 81 are arranged on the sealing pressing plate 29 from top to bottom in sequence. The high-performance sealing ring 6, the O-ring 31, and the O-ring 7 are provided to ensure the forward sealing of the valve, and the high-performance sealing ring 6, the O-ring 31, and the O-ring 7 are provided to ensure the reverse sealing of the valve. The upper Gland ring 8 and the lower Gland ring 81 are mainly used for guiding the valve core 4, reducing the wear of the high-performance sealing ring 6 during its movement, and can also achieve a certain sealing effect.

[0024] By setting the O-ring 31 to replace the traditional O-ring, the sealing effect is better. The outer circumference of the O-ring 31 is in the shape of four sealing lips. When the sealing pressing plate 29 and the sleeve 5 apply pressure to the O-ring 31, the O-ring 31 will transmit the received pressure to all directions including the sleeve 5 direction and the sealing pressing plate 29 direction through the four outer sealing lips. And as the pressure increases, the sealing lips deform so that the sealing lips gradually fit with the sleeve 5 and the sealing pressing plate 29. Thus, the sealing force between the O-ring 31 and the sleeve 5 and the sealing pressing plate 29 will also increase.

[0025] Specifically, an upper limit ring (not shown in the figure) and a lower limit ring (not shown in the figure) can also be arranged in the sealing groove 30. The upper limit ring and the lower limit ring respectively abut against both sides of the O-ring 31. By the upper limit ring and the lower limit ring, the rolling of the O-ring 31 in the sealing groove 30 during the operation of the shut-off valve is restricted, thus avoiding the overall deformation of the O-ring 31, which may cause the sealing lips to not fit tightly with the sleeve 5 and the sealing pressing plate 29, thereby reducing the sealing performance.

[0026] Specifically, a sealing cover 32 is arranged above the sealing pressing plate 29 and the valve core 4. An upper ring groove 33 is formed on the sealing cover 32. A lower ring groove 34 is arranged on the side of the valve core 4 close to the sleeve 5. High-performance sealing rings 6 are arranged in both the upper ring groove 33 and the lower ring groove 34. Corresponding screw holes are provided between the sealing cover 32 and the valve core 4, and the sealing cover 32 and the valve core 4 are fixedly connected by screws.

[0027] Specifically, a notch is formed on the side of the valve body 1 in contact with the sleeve 5. The sleeve 5 protrudes correspondingly to form an abutting block 35 at the notch. A serrated gasket 9 is arranged between the abutting block 35 and the notch. By setting the abutting block 35, a supporting point is formed between the sleeve 5 and the valve body 1 to prevent the sleeve 5 from falling off.

[0028] Preferably, one end of the bellows component 10 is fixedly connected to the valve stem 15, and the other end of the bellows component 10 is fixedly connected to the valve cover 11.

[0029] By providing a V-shaped packing, a U-shaped groove 16 is provided on the V-shaped packing 12, a spring is provided below the packing 12, one end of the spring abuts against the packing 12, and the other end of the spring is connected to the bottom wall of the packing groove 25. The U-shaped groove 16 can increase the deformation of the V-shaped packing 12 to achieve a better sealing effect. The spring at the lower part of the packing 12 ring presses the packing 12 from the inside. This structure makes the radial contact pressure distribution between the packing 12 and the valve stem 15 tend to be uniform along the axial direction, enabling each ring of the packing 12 to play a sealing role and facilitating the realization of sealing. In the middle of the valve stem 15, a relatively thick liquid film is easily formed, which plays a good lubricating role, can reduce the wear of the packing 12 on the valve stem 15, and extend the service life of the valve.

[0030] Specifically, a packing gland 13 is provided above the packing 12. A sealing ring groove 21 is provided on the packing gland 13, and an O-ring 7 is provided in the sealing ring groove 21. A dust-proof sealing ring 14 is provided between the packing gland 13 and the packing 12. The dust-proof sealing ring 14 and the O-ring 7 are placed on the packing gland 13, preventing impurities attached to the exposed surface of the valve stem 15 from entering the interior of the packing 12 cavity along with the valve stem 15 and causing damage to the valve stem 15 and the packing 12, and at the same time playing an auxiliary sealing role.

[0031] Specifically, a lock washer 17 is provided between the screw and the sealing gland 32. The lock washer 17 is composed of an upper washer 18 and a lower washer 19. The upper washer 18 and the lower washer 19 are provided with corresponding serrated surfaces 20. The serrated surface 20 of the upper washer 18 is meshed and connected with the serrated surface 20 of the lower washer 19. The washer locks not by friction but by a mechanical structure. It is composed of a pair of washers with interlocking tooth surfaces, and the interlocking angle is greater than the lead angle of the thread, effectively preventing the loosening of the screw. The same lock washer 17 is provided at all parts that require screw connection in the present invention.

[0032] Specifically, a valve body 1 sealing groove 30 is opened at the connection between the valve body 1 and the valve seat 3. A valve body 1 sealing ring is provided in the valve body 1 sealing groove 30, and a graphite gasket 2 is further provided above the valve body 1 sealing ring. The graphite gasket 2 is provided between the valve body 1 and the valve seat 3.

[0033] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A natural gas emergency shut-off valve, characterized in that: It includes a valve body, a middle barrel and a valve cover, the valve cover is arranged above the middle barrel, the valve body is arranged below the middle barrel, the valve body and the valve cover are both connected to the middle barrel, a valve cavity is formed inside the valve body, a feed port and a discharge port are arranged on both sides of the valve cavity, a valve seat and a valve core are arranged in the valve cavity, a valve stem is arranged on the valve cover, the valve stem penetrates the valve cover and the middle barrel, extends into the valve cavity and is connected to the valve core, a stuffing groove is formed between the valve cover and the valve stem, stuffing is arranged in the stuffing groove, a bellows component is arranged on the valve stem, the bellows component is connected to the valve stem, an installation cavity is formed between the valve core and the valve body, the A sleeve is arranged in the installation cavity, one side of the sleeve is connected to the inner wall of the valve body, and the other side is connected to the valve core, the sleeve and the valve core form a sealing cavity, a sealing assembly is arranged in the sealing cavity, a valve seat is arranged in the valve cavity, a sealing ring is arranged between the valve seat and the valve body and the valve core, the sealing assembly includes a sealing pressure plate, an upper grid ring and a lower grid ring are arranged on the sealing pressure plate, a sealing groove is formed between the sealing pressure plate and the sleeve, a star ring is arranged in the sealing groove, the star ring connects the sleeve and the sealing pressure plate, and the upper grid ring, the star ring and the lower grid ring are arranged on the sealing pressure plate in sequence from top to bottom.

2. The natural gas emergency shut-off valve according to claim 1, characterized in that: A sealing cover is arranged above the sealing pressure plate and the valve core, an upper ring groove is formed on the sealing cover, a lower ring groove is arranged on the side of the valve core close to the sleeve, high-performance sealing rings are arranged in the upper ring groove and the lower ring groove, screw holes are arranged correspondingly between the sealing cover and the valve core, and the sealing cover and the valve core are connected and fixed by screws.

3. The natural gas emergency shut-off valve according to claim 2 is characterized in that: A notch is formed on one side of the valve body in contact with the sleeve, and the sleeve protrudes corresponding to the notch to form an abutment block, and a serrated pad is arranged between the abutment block and the notch.

4. The natural gas emergency shut-off valve according to claim 1, characterized in that: One end of the bellows component is connected and fixed to the valve stem, and the other end of the bellows component is connected and fixed to the valve cover.

5. The natural gas emergency shut-off valve according to claim 1, characterized in that: The packing is a V-shaped packing, a U-shaped groove is arranged on the V-shaped packing, a spring is arranged below the packing, one end of the spring abuts against the packing, and the other end of the spring is connected to the bottom wall of the packing groove.

6. The natural gas emergency shut-off valve according to claim 1, characterized in that: A packing gland is arranged above the packing, a sealing ring groove is provided on the packing gland, an O-type sealing ring is arranged in the sealing ring groove, and a dustproof sealing ring is arranged between the packing gland and the packing.

7. The natural gas emergency shut-off valve according to claim 2, characterized in that: An anti-loosening gasket is arranged between the screw and the sealing cover, and the anti-loosening gasket consists of an upper gasket and a lower gasket. The upper gasket and the lower gasket are provided with corresponding serrated surfaces, and the serrated surface of the upper gasket is meshed and connected with the serrated surface of the lower gasket.

8. The natural gas emergency shut-off valve according to claim 1, characterized in that: A valve body sealing groove is provided at the connection between the valve body and the valve seat, a valve body sealing ring is arranged in the valve body sealing groove, a graphite gasket is also arranged above the valve body sealing ring, and the graphite gasket is arranged between the valve body and the valve seat.

Images