Low-temperature stop valve

Abstract

The utility model relates to a low-temperature stop valve. A valve rod is arranged in a valve body; one end of the valve rod is connected with a low-temperature sealing structure through a thread structure; the low-temperature sealing structure is sealed with a valve seat fixed on the valve body; the low-temperature sealing structure adjusts the stroke of hard sealing contact with the valve seat through the thread structure. According to the low-temperature stop valve, the positions of the sealing structure and the valve rod of the low-temperature stop valve can be adjusted, and the problem that in an existing low-temperature stop valve, due to the fact that the sealing structure of the low-temperature stop valve cannot be adjusted generally, the valve rod and the low-temperature sealing structure of the low-temperature stop valve expand due to heat and contract due to cold in the rapid temperature change process is solved. And as the sealing structure of the low-temperature stop valve cannot be adjusted, the low-temperature stop valve leaks, and the valve is scrapped.

Description

Technical Field

[0001] The embodiment of the utility model relates to a stop valve, in particular to a low-temperature stop valve. Background Art

[0002] In the existing low-temperature stop valve, since the sealing structure of the low-temperature stop valve is generally not adjustable, the valve stem and the low-temperature sealing structure of the low-temperature stop valve expand and contract during the rapid temperature change, causing the low-temperature sealing structure to change. Since the sealing structure of the low-temperature stop valve cannot be adjusted, the low-temperature stop valve leaks, causing the valve to be scrapped. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide a low-temperature stop valve capable of adjusting the sealing structure of the low-temperature stop valve and the valve stem position of the low-temperature stop valve.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the utility model designs a low-temperature stop valve, comprising:

[0005] Valve body;

[0006] A valve stem, the valve stem being arranged in the valve body;

[0007] A low temperature sealing structure is connected to one end of the valve stem via a threaded structure;

[0008] The valve seat, the low-temperature sealing structure is sealed with the valve seat fixed on the valve body; the low-temperature sealing structure adjusts the stroke of hard sealing contact with the valve seat through a threaded structure.

[0009] Furthermore, in the low-temperature stop valve of the utility model, the low-temperature sealing structure further includes:

[0010] A valve flap cover is inserted into one end of the valve stem and movably connected to the valve flap cover;

[0011] The valve flap is connected to the valve flap through a thread at the lower end of the valve flap cover, so that the valve stem rotates in the cavity between the valve flap cover and the valve flap.

[0012] Furthermore, in the low-temperature stop valve of the utility model, a valve cover is fixed to the valve body by bolts and nuts, a guide block is arranged between the valve cover and the valve stem, and a cavity is arranged above the guide block.

[0013] Furthermore, in the low-temperature stop valve of the utility model, an oil nozzle is fixed on the valve cover above the cavity.

[0014] Furthermore, in the low-temperature stop valve of the utility model, a valve stem sleeve is inserted into the valve stem on one side of the oil nozzle, and a valve cover fixing sleeve is threadedly connected to the valve cover above the valve stem sleeve.

[0015] Furthermore, in the low-temperature stop valve of the utility model, a hand wheel is sleeved on the valve stem above the valve cover fixing sleeve, and a valve stem nut is fixed on the valve stem.

[0016] Furthermore, in the low-temperature stop valve of the utility model, a packing sealing structure is provided on the valve cover below the wire block.

[0017] Further, in the low-temperature stop valve of the utility model, the packing sealing structure comprises:

[0018] A packing pad is inserted below the packing sealing structure, on the valve stem, and inside the valve cover;

[0019] A packing, above the packing pad and around the valve stem;

[0020] A packing gland is placed above the packing and on the valve stem;

[0021] A packing pressure plate is above the packing pressure sleeve, and one end of the packing pressure plate is sleeved on the valve stem; the other end of the packing pressure plate is fixedly connected to a packing pressing mechanism arranged on the valve cover.

[0022] Furthermore, in the low-temperature stop valve of the utility model, the packing pressing mechanism further includes:

[0023] A swing bolt, one end of which is movably connected to the valve cover through a pin shaft;

[0024] A clamping nut is fixed to the clamping nut after the movable bolt passes through the packing pressure plate.

[0025] Furthermore, in the low-temperature stop valve of the utility model, a sealing seat bushing is threadedly connected below the valve cover; the valve stem is inserted into the middle of the sealing seat bushing; and a bushing is inserted onto the valve stem above the sealing seat bushing.

[0026] Compared with the prior art, the implementation method of the utility model adopts a method of setting a valve stem in the valve body; connecting a low-temperature sealing structure through a threaded structure at one end of the valve stem; the low-temperature sealing structure is sealed with a valve seat fixed on the valve body; and the low-temperature sealing structure adjusts the stroke of the hard seal contact with the valve seat through the threaded structure. The sealing structure of the low-temperature stop valve and the valve stem position of the low-temperature stop valve can be adjusted, which solves the technical problem that in the existing low-temperature stop valve, since the sealing structure of the low-temperature stop valve is generally not adjustable, the valve stem and the low-temperature sealing structure of the low-temperature stop valve expand and contract during the rapid temperature change, causing the low-temperature sealing structure to change. Since the sealing structure of the low-temperature stop valve cannot be adjusted, the temperature stop valve leaks, causing the valve to be scrapped. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the internal structure of the utility model; DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0029] The embodiment of the utility model relates to a low temperature stop valve, such as Figure 1 As shown, including:

[0030] The valve body 1 in this embodiment serves as the base of the low-temperature stop valve in this embodiment;

[0031] A valve stem 5 is arranged in the valve body 1; the valve stem 5 is used to drive the low temperature sealing structure 100;

[0032] A low-temperature sealing structure 100 is connected to one end of the valve stem 5 through a threaded structure; the low-temperature sealing structure 100 is mainly used for sealing in a low-temperature environment. The low-temperature environment in this embodiment is generally between -170 degrees Celsius and -180 degrees Celsius, because the low temperature has a particularly large impact on the low-temperature sealing structure 100.

[0033] The low temperature sealing structure 100 is sealed with the valve seat 2 fixed on the valve body 1; the low temperature sealing structure 100 adjusts the stroke of the hard seal contact with the valve seat 2 through the threaded structure. The hard seal contact between the valve seat 2 and the low temperature sealing structure 100 enables the low temperature stop valve to play a cut-off role. In this embodiment, the stroke of the hard seal contact with the valve seat 2 is adjusted by the threaded structure or the low temperature sealing structure 100 is directly replaced, so that the sealing structure of the low temperature stop valve and the valve stem position of the low temperature stop valve can be adjusted, and the technical problem that the sealing structure of the low temperature stop valve is generally not adjustable in the existing low temperature stop valve, resulting in the thermal expansion and contraction of the valve stem 5 and the low temperature sealing structure 100 of the low temperature stop valve during the rapid temperature change, causing the low temperature sealing structure to change, and the low temperature stop valve leaks because the sealing structure of the low temperature stop valve cannot be adjusted, which causes the valve to be scrapped.

[0034] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1 As shown, the low temperature sealing structure 100 further includes:

[0035] A valve flap cover 4 is inserted into one end of the valve stem 5, and the valve flap cover 4 is movably connected;

[0036] The valve disc 3 is connected to the lower end of the valve disc cover 4 by threads, so that the valve stem rotates in the cavity between the valve disc cover 4 and the valve disc 3. The valve disc cover 4 and the valve disc 3 are connected by threads to form the structure of the low-temperature sealing structure 100 in this embodiment, which well realizes the function of adjusting the sealing structure of the low-temperature stop valve and the valve stem position of the low-temperature stop valve. It solves the technical problem that in the existing low-temperature stop valve, since the sealing structure of the low-temperature stop valve is generally not adjustable, the valve stem 5 and the low-temperature sealing structure 100 of the low-temperature stop valve expand and contract during the rapid temperature change, causing the low-temperature sealing structure to change. Since the sealing structure of the low-temperature stop valve cannot be adjusted, the low-temperature stop valve leaks, causing the valve to be scrapped.

[0037] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1 As shown, a valve cover 11 is fixed to the valve body 1 by bolts and nuts, a guide block 17 is arranged between the valve cover 11 and the valve stem 5, and a cavity is arranged above the guide block 17. The cavity is used to inject lubricating oil to lubricate the rotation of the valve stem 5.

[0038] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1 As shown, an oil nozzle 22 is fixed above the cavity on the valve cover 11. The oil nozzle 22 is used to inject lubricating oil.

[0039] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1As shown, on one side of the oil nozzle 22, a valve stem sleeve 18 is inserted into the valve stem 5, and a valve cover fixing sleeve 19 is threadedly connected to the valve cover 11 above the valve stem sleeve 18. The valve stem sleeve 18 and the valve cover fixing sleeve 19 are used to fix the valve stem 5.

[0040] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1 As shown, above the valve cover fixing sleeve 19, a hand wheel 20 is inserted into the valve stem 5, and a valve stem nut 21 is fixed on the valve stem 5. The hand wheel 20 is used to rotate the valve stem 5 to lift the valve stem 5.

[0041] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1 As shown, a packing seal structure 200 is provided on the valve cover 11 below the wire block 17. The packing seal structure 200 is used to seal the gap between the valve cover 11 and the valve stem 5.

[0042] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1 As shown, the packing seal structure 200 comprises:

[0043] A packing pad 12 is inserted below the packing seal structure 200 , on the valve stem 5 , and inside the valve cover 11 ; the packing pad 12 is used to pad the packing 13 ;

[0044] Above the packing pad 12, a packing 13 is placed around the valve stem 5; the packing 13 is used to seal around the valve stem 5;

[0045] Above the packing 13, a packing gland 14 is inserted on the valve stem 5;

[0046] Above the packing gland 14, one end of the packing plate 15 is inserted on the valve stem 5; the other end of the packing plate 15 is fixedly connected to the packing pressing mechanism 300 provided on the valve cover 11. The packing gland 14 and the packing plate 15 are used to press the packing 13. They play the role of pressing the packing 13.

[0047] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1 As shown, the packing pressing mechanism 300 further includes:

[0048] One end of the swing bolt 23 is movably connected to one side of the valve cover 11 through a pin shaft 25;

[0049] After the swing bolt 23 passes through the packing pressing plate 15, it is fixed with the clamping nut 24. The swing bolt 23 and the clamping nut 24 compress the packing 13 through the packing pressing plate 15. Play the role of compressing the packing 13.

[0050] In order to achieve the above technical effects, the low temperature stop valve in this embodiment, such as Figure 1As shown, the sealing seat bushing 9 is threadedly connected below the valve cover 11; the valve stem 5 is inserted into the middle of the sealing seat bushing 9; and the bushing 10 is inserted on the valve stem 5 above the sealing seat bushing 9. The sealing seat bushing 9 and the bushing 10 are mainly used to limit the position of the valve stem 5.

[0051] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A cryogenic stop valve, characterized in that: include: Valve body; A valve stem, the valve stem being arranged in the valve body; A low temperature sealing structure is connected to one end of the valve stem via a threaded structure; The valve seat, the low-temperature sealing structure is sealed with the valve seat fixed on the valve body; the low-temperature sealing structure adjusts the stroke of hard sealing contact with the valve seat through a threaded structure.

2. The cryogenic shut-off valve according to claim 1, characterized in that: The low temperature sealing structure further comprises: A valve flap cover is inserted into one end of the valve stem and movably connected to the valve flap cover; The valve flap is connected to the valve flap through a thread at the lower end of the valve flap cover, so that the valve stem rotates in the cavity between the valve flap cover and the valve flap.

3. The cryogenic shut-off valve according to claim 1, characterized in that: A valve cover is fixed on the valve body by bolts and nuts, a guide block is arranged between the valve cover and the valve stem, and a cavity is arranged above the guide block.

4. The cryogenic shut-off valve according to claim 3, characterized in that: An oil nozzle is fixed on the valve cover above the cavity.

5. The cryogenic shut-off valve according to claim 4, characterized in that: On one side of the oil nozzle, a valve stem sleeve is inserted into the valve stem, and a valve cover fixing sleeve is threadedly connected with the valve cover above the valve stem sleeve.

6. The cryogenic shut-off valve according to claim 5, characterized in that: A hand wheel is sleeved on the valve stem above the valve cover fixing sleeve, and a valve stem nut is fixed on the valve stem.

7. The cryogenic shut-off valve according to claim 4, characterized in that: A packing sealing structure is arranged on the valve cover below the wire block.

8. The cryogenic shut-off valve according to claim 7, characterized in that: The packing sealing structure comprises: A packing pad is inserted below the packing sealing structure, on the valve stem, and inside the valve cover; A packing, above the packing pad and around the valve stem; A packing gland is placed above the packing and on the valve stem; A packing pressure plate is above the packing pressure sleeve, and one end of the packing pressure plate is sleeved on the valve stem; the other end of the packing pressure plate is fixedly connected to a packing pressing mechanism arranged on the valve cover.

9. The cryogenic shut-off valve according to claim 8, characterized in that: The packing pressing mechanism further comprises: A swing bolt, one end of which is movably connected to the valve cover through a pin shaft; A clamping nut is fixed to the clamping nut after the movable bolt passes through the packing pressure plate.

10. The cryogenic shut-off valve according to claim 7, characterized in that: A sealing seat bushing is threadedly connected below the valve cover; the valve stem is sleeved in the middle of the sealing seat bushing; and a bushing is sleeved on the valve stem above the sealing seat bushing.

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