Leakage-proof gate valve for conveying chlorine

Abstract

The utility model provides a leak-proof gate valve for conveying chlorine, which comprises a valve body, a long-neck valve cover mounted on the valve body, a support mounted on the long-neck valve cover, a valve rod penetrating through the support, a valve rod nut mounted at the top end of the valve rod and extending into the valve body, and a valve rod nut mounted at the bottom end of the valve rod. A valve rod rotating device is arranged on the valve rod nut; a valve seat is installed in the valve body, and the bottom end of the valve rod is connected with a gate plate which is matched with the valve seat in a pressing mode. A sealing device is arranged between the upper end of the bracket and the valve rod; the periphery of the part, located in the valve body and the long-neck valve deck, of the valve rod is sleeved with a corrugated pipe. The limiting device is sleeved at the outer end of the corrugated pipe, one end of the limiting device is fixed on the valve rod, and the other end of the limiting device extends upwards to the inner cavity of the long-neck valve cover along the axial direction of the valve rod. Double sealing is adopted, displacement guiding is conducted on the valve rod through the limiting device, and the sealing reliability of the gate valve is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a leakage-proof gate valve for conveying chlorine. Background Art

[0002] Chlorine gas transportation requires the use of highly sealed valves, and bellows are generally installed inside the valve to improve the sealing performance of the valve.

[0003] However, the existing bellows gate valve has the following defects during its use: 1. There is a lack of protection for the key component bellows. Impurities in the medium and the medium itself will inevitably cause certain corrosion to the bellows, which is easy to cause damage to the bellows and cause unnecessary safety accidents; 2. The existing chlorine gate valve adopts a long-necked valve cover, and there is a gap between the valve stem and the long-necked valve cover and the valve body. Therefore, the axial displacement accuracy of the valve stem is poor and it is easy to shake, causing the bellows to be sprained, and it also causes certain wear on the packing, resulting in a significant reduction in the sealing performance of the valve; technical personnel in this field urgently need to solve the above technical problems. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a leakage-proof gate valve for conveying chlorine gas, which has double sealing and a valve stem displacement guide to improve the sealing reliability of the valve.

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

[0006] A leakage-proof gate valve for conveying chlorine gas, comprising:

[0007] A valve body, a long-necked valve cover is mounted on the valve body, a bracket is mounted on the long-necked valve cover, a valve stem is passed through the bracket, the bottom end of the valve stem extends into the long-necked valve cover and into the valve body, a valve stem nut is mounted on the top end of the valve stem, and a valve stem rotating device is provided on the valve stem nut;

[0008] A valve seat is installed in the valve body, and a gate plate which is tightly fitted with the valve seat is connected to the bottom end of the valve stem;

[0009] A sealing device is provided between the upper end of the bracket and the valve stem;

[0010] The portion of the valve stem located inside the valve body and the long-necked valve cover is sleeved with a bellows on its outer periphery;

[0011] It also includes a limiting device, which is sleeved on the outer end of the bellows, with one end fixed on the valve stem and the other end extending upward along the axial direction of the valve stem to the inner cavity of the long-necked valve cover.

[0012] In a preferred embodiment of the utility model, the top end of the bellows is arranged between the long-necked valve cover and the bracket, and a gasket is arranged to form a static seal, and the bottom end of the bellows is provided with a guide ring, and the guide ring is welded and fixed to the valve stem.

[0013] In a preferred embodiment of the utility model, the limiting device is configured as a sleeve, a limiting groove for installing the sleeve is provided on the guide ring, a guide groove slidingly matched with the outer end surface of the sleeve is provided in the inner cavity of the long-necked valve cover, and the sleeve moves in the guide groove along with the valve stem.

[0014] In a preferred example of the utility model, the sealing device includes: a packing, a packing sleeve and a packing pressure plate. A packing groove is provided on the top of the bracket, the packing is arranged in the packing groove, the packing sleeve is provided at the top end of the packing, a packing pressure plate is provided at the top end of the packing sleeve, and the packing pressure plate is fastened to the bracket by bolts.

[0015] In a preferred embodiment of the present invention, the gate plate has a T-shaped groove on its upper portion for connecting with the valve stem, grooves are symmetrically provided on both sides of the gate plate where the gate plate contacts the valve seat relative to the center axis of the gate plate, and a sealing ring is installed on the contact side of the valve seat and the gate plate.

[0016] In a preferred embodiment of the present invention, the valve stem includes: an upper rod body and a lower rod body, the diameter of the upper rod body is smaller than the diameter of the lower rod body, the upper rod body and the lower rod body are integrally formed, and a T-block matching the T-slot is provided at the bottom end of the lower rod body for clamping with the gate plate.

[0017] Beneficial effects: The utility model is a leak-proof gate valve for conveying chlorine, which adopts a bellows and a sealing device to realize double sealing of the gate valve. One end of the limit device is fixed on the valve stem, and the other end extends to the inner cavity of the long-necked valve cover. The limit device is used to prevent the medium from directly contacting the bellows, and acts as a protective cover for the bellows.

[0018] Under the guidance of the limit device, the valve stem has high axial movement position accuracy, which can not only prevent the twisting of the bellows, but also reduce the wear of the valve stem on the packing.

[0019] The utility model is suitable for chlorine gas transportation, adopts double sealing, and a limit device guides the displacement of the valve stem, thereby further improving the sealing reliability of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A half-section view of a leak-proof gate valve for conveying chlorine provided by the utility model;

[0021] Figure 2 For the utility model Figure 1 A local enlarged view of point A;

[0022] Figure 3 The utility model is a partial half-section view of a leakage-proof gate valve for conveying chlorine provided by the utility model.

[0023] In the figure: 1 valve body;

[0024] 2 long neck valve cover;

[0025] 3 brackets;

[0026] 4 valve stem, 41 upper stem body, 42 lower stem body;

[0027] 5. Valve seat;

[0028] 6 gates;

[0029] 7 sealing device, 71 packing, 72 packing gland, 73 packing pressure plate;

[0030] 8 bellows;

[0031] 9 Limiting device. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1 As shown, the utility model provides a leakage-proof gate valve for conveying chlorine, comprising: a valve body 1, a long-necked valve cover 2 is installed on the valve body 1, a bracket 3 is installed on the long-necked valve cover 2, a valve stem 4 is passed through the bracket 3, the bottom end of the valve stem 4 extends into the long-necked valve cover 2 and extends into the valve body 1, a valve stem nut is installed on the top end of the valve stem 4, and a valve stem rotating device is provided on the valve stem nut;

[0034] A valve seat 5 is installed in the valve body 1, and a gate plate 6 which is tightly fitted with the valve seat 5 is connected to the bottom end of the valve stem 4;

[0035] A sealing device 7 is provided between the upper end of the bracket 3 and the valve stem 4;

[0036] The portion of the valve stem 4 located inside the valve body 1 and the long-necked valve cover 2 is sleeved with a bellows 8 on its outer periphery;

[0037] The working principle and beneficial effects of the above technical solution are:

[0038] The bellows 8 and the sealing device 7 are used to realize the double sealing of the gate valve. When the gate valve is in operation, the valve stem rotating device drives the valve stem 4 to move vertically, thereby driving the gate plate 6 to move up and down to open and close the pipeline. The bellows 8 and the sealing device 7 are used to seal the valve stem 4 to avoid leakage of the medium during the movement of the valve stem 4.

[0039] In one embodiment, a limiting device 9 is also included.

[0040] The limit device 9 is sleeved on the outer end of the bellows 8, one end of which is fixed to the lower end of the valve stem 4, and the other end of which extends upward along the axial direction of the valve stem 4 to the inner cavity of the long-necked valve cover 2 and is slidably connected with the inner cavity of the long-necked valve cover 2;

[0041] The working principle and beneficial effects of the above technical solution are:

[0042] One end of the limit device 9 is fixed on the valve stem 4, and the other end extends to the inner cavity of the long-necked valve cover 2. The limit device 9 is used to prevent the medium from directly contacting the bellows 8. Because the axial dimension of the valve stem 4 is relatively long and there are gaps between the long-necked valve cover 2 and the valve body 1, the valve stem 4 has high axial movement position accuracy under the guidance of the limit device 9, which not only prevents the bellows 8 from being twisted, but also reduces the wear of the valve stem 4 on the packing.

[0043] In one embodiment, Figure 2 As shown, the top end of the bellows 8 is arranged between the long-necked valve cover 2 and the bracket 3, and a gasket is arranged to form a static seal, and the bottom end of the bellows 8 is provided with a guide ring, which is welded and fixed to the valve stem 4;

[0044] The working principle and beneficial effects of the above technical solution are:

[0045] The bellows 8 can telescopically move along the axial direction of the valve stem 4 , and the guide ring can increase the welding strength between the bellows 8 and the valve stem 4 , thereby increasing the service life of the bellows 8 .

[0046] In one embodiment, Figure 3 As shown, the limiting device 9 is set as a sleeve, and a limiting groove for installing the sleeve is opened on the guide ring. The sleeve is clamped in the limiting groove and fixed by bolts; a guide groove that slides with the outer end surface of the sleeve is opened in the inner cavity of the long-necked valve cover 2, and the sleeve moves in the guide groove along with the valve stem 4;

[0047] The working principle and beneficial effects of the above technical solution are:

[0048] The guide ring is provided with a limiting groove for installing the sleeve, which is convenient for the axial installation and limiting of the sleeve and the cooperation with the inner cavity of the long-necked valve cover 2, and has high centering accuracy.

[0049] In one embodiment, the sealing device 7 comprises:

[0050] Packing 71, packing pressing sleeve 72 and packing pressing plate 73. A packing groove is provided at the top of the bracket 3. The packing 71 is provided in the packing groove. A packing pressing sleeve 72 is provided at the top of the packing 71. A packing pressing plate 73 is provided at the top of the packing pressing sleeve 72. The packing pressing plate 73 is fastened to the bracket 3 by bolts.

[0051] The working principle and beneficial effects of the above technical solution are:

[0052] The valve stem 4 passes through the packing groove, packing 71, packing sleeve 72 and packing pressure plate 73 in sequence to connect the valve stem nut, fill the packing 71 into the packing groove, and compact the packing 71 through the packing pressure plate 73 and the packing sleeve 72 to seal the connection between the valve stem 3 and the upper cover body 21, with good sealing performance.

[0053] In one embodiment, the gate 6,

[0054] A T-shaped groove for connecting with the valve stem 4 is provided on its upper part, grooves are symmetrically provided on both sides where the gate plate 6 contacts the valve seat 5 and the central axis of the gate plate 6, and a sealing ring is installed on the contact side of the valve seat 5 and the gate plate 6;

[0055] The working principle and beneficial effects of the above technical solution are:

[0056] The design of the grooves on both sides of the gate plate 6 makes the slight deformation of the gate plate insufficient to lock with the valve seat 5, ensuring smooth opening. With the help of the elastic deformation of the sealing ring, a specific pressure is formed between the gate plate 6 to achieve sealing.

[0057] In one embodiment, the valve stem 4 comprises:

[0058] An upper rod body 41 and a lower rod body 42, wherein the diameter of the upper rod body 41 is smaller than that of the lower rod body 42, the upper rod body 41 and the lower rod body 42 are integrally formed, and a T-shaped block matching the T-shaped slot is provided at the bottom end of the lower rod body 42 for clamping with the gate plate 6;

[0059] The working principle and beneficial effects of the above technical solution are:

[0060] The valve stem 4 is slidably installed in the bracket 3 and penetrates the valve body 1 and the long-necked valve cover 2. The matching accuracy requirement is low, which reduces the overall processing difficulty of the valve stem 4. Therefore, the valve stem 4 is integrally formed, with high overall strength and easy processing. The lower end of the valve stem 4 is a large-diameter rod body to enhance the connection strength with the gate 6.

[0061] In summary:

[0062] The utility model discloses a leakage-proof gate valve for conveying chlorine gas, which adopts a bellows and a sealing device to realize double sealing of the gate valve. One end of the limit device is fixed on the valve stem, and the other end extends to the inner cavity of the long-necked valve cover. The limit device is used to prevent the medium from directly contacting the bellows, and plays the role of a protective cover for the bellows.

[0063] Under the guidance of the limit device, the valve stem has high axial movement position accuracy, which can not only prevent the twisting of the bellows, but also reduce the wear of the valve stem on the packing.

[0064] The utility model is suitable for chlorine gas transportation, and adopts double sealing and limiting devices to guide the valve stem, thereby further improving the sealing reliability of the gate valve.

[0065] The above shows and describes the basic principle, main features and advantages of the utility model. The front, back, left and right used in the text are not specific, mainly for a more intuitive description of the technical solution, and do not have a limiting effect. The technical personnel in this industry should understand that the above implementation is only to illustrate the technical concept and characteristics of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it, and it cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A leak-proof gate valve for conveying chlorine, characterized in that: include A valve body (1), a long-necked valve cover (2) is mounted on the valve body (1), a bracket (3) is mounted on the long-necked valve cover (2), a valve stem (4) is passed through the bracket (3), the bottom end of the valve stem (4) extends into the long-necked valve cover (2) and into the valve body (1), a valve stem nut is mounted on the top end of the valve stem (4), and a valve stem rotating device is provided on the valve stem nut; A valve seat (5) is installed in the valve body (1), and a gate plate (6) which is tightly fitted with the valve seat (5) is connected to the bottom end of the valve stem (4); A sealing device (7) is provided between the upper end of the bracket (3) and the valve stem (4); The portion of the valve stem (4) located inside the valve body (1) and the long-necked valve cover (2) is sleeved with a bellows (8) on its outer circumference; It also includes a limit device (9) which is sleeved on the outer end of the bellows (8), one end of which is fixed on the valve stem (4) and the other end of which extends upward along the axial direction of the valve stem (4) to the inner cavity of the long-necked valve cover (2).

2. The anti-leakage gate valve for conveying chlorine according to claim 1, characterized in that: The top end of the bellows (8) is arranged between the long-necked valve cover (2) and the bracket (3), and a gasket is arranged to form a static seal. The bottom end of the bellows (8) is provided with a guide ring, and the guide ring is welded and fixed to the valve stem (4).

3. The anti-leakage gate valve for conveying chlorine according to claim 2, characterized in that: The limiting device (9) is configured as a sleeve, a limiting groove for installing the sleeve is provided on the guide ring, a guide groove for slidingly cooperating with the outer end surface of the sleeve is provided in the inner cavity of the long-necked valve cover (2), and the sleeve moves in the guide groove along with the valve stem (4).

4. The anti-leakage gate valve for conveying chlorine according to claim 1, characterized in that: The sealing device (7) comprises: a packing (71), a packing pressing sleeve (72) and a packing pressing plate (73); a packing groove is arranged at the top of the bracket (3); the packing (71) is arranged in the packing groove; the packing pressing sleeve (72) is arranged at the top end of the packing (71); a packing pressing plate (73) is arranged at the top end of the packing pressing sleeve (72); and the packing pressing plate (73) is fastened to the bracket (3) by bolts.

5. The anti-leakage gate valve for conveying chlorine according to claim 1, characterized in that: The gate plate (6) has a T-shaped groove on its upper portion for connection with the valve stem (4), grooves are symmetrically provided on both sides of the gate plate (6) in contact with the valve seat (5) relative to the central axis of the gate plate (6), and a sealing ring is installed on the contact side of the valve seat (5) and the gate plate (6).

6. The anti-leakage gate valve for conveying chlorine according to claim 5, characterized in that: The valve stem (4) comprises an upper stem body (41) and a lower stem body (42); the diameter of the upper stem body (41) is smaller than the diameter of the lower stem body (42); the upper stem body (41) and the lower stem body (42) are integrally formed; a T-shaped block matching the T-shaped slot is provided at the bottom end of the lower stem body (42) for clamping with the gate plate (6).

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