A new type of gate valve

Abstract

The utility model discloses a new type of gate valve, including a valve body and a valve cover arranged on the valve body, an inlet and an outlet are arranged on the valve body, a valve plate is arranged in the valve body, a first valve seat is arranged on the side of the valve plate close to the inlet, a second valve seat is arranged on the side of the valve plate close to the outlet, a floating sealing device is arranged at one end of the first valve seat in contact with the valve body, the floating sealing device includes a groove arranged on the contact surface between the first valve seat and the valve body and an elastic component connected in the groove, the floating sealing device is pushed to form a first sealing match with the valve plate, the valve plate is pushed by the medium so that the second valve seat forms a sealing match with the valve body, the gate valve is sealed through the double sealing match, and when the pressure in the middle cavity increases abnormally, the first valve seat is pushed open, thereby releasing the pressure in the middle cavity. The utility model enables the valve seat to achieve a certain floating in the sealing direction, thereby solving the problem that the angle of the valve seat changes after being worn and often causes leakage.

Description

Technical Field

[0001] The utility model relates to the field of gate valves, in particular to a new type of gate valve. Background Art

[0002] Gate valves are widely used in the fields of petroleum, natural gas, and chemical industry, and have become a standardized general product. The valve seats on the market are usually integrated structures. In order to ensure sealing, the angle between the valve seats needs to be completely consistent with the angle between the gate plates. Otherwise, the sealing surface of the valve plate and the valve seat does not fit completely, which will cause leakage. Even if the sealing surface of a new valve fits, after use and wear, the angle changes, which often causes leakage. Therefore, the market urgently needs technology that can improve the valve seat structure to improve this structure. Utility Model Content

[0003] In view of the above-mentioned deficiencies of the current gate valve, the utility model provides a new gate valve, which can enable the valve seat to float to a certain extent in the sealing direction, thereby solving the problem that the valve seat often causes leakage due to the change of the angle after being worn.

[0004] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0005] A new type of gate valve, including a valve body and a valve cover arranged on the valve body, the valve body is provided with an inlet and an outlet, the valve body is provided with a valve plate, the valve plate is provided with a first valve seat on the side close to the inlet, and the valve plate is provided with a second valve seat on the side close to the outlet, and a floating sealing device is provided at the end of the first valve seat in contact with the valve body, the floating sealing device includes a groove arranged on the contact surface between the first valve seat and the valve body and an elastic component connected to the groove, the floating sealing device is pushed to form a first sealing cooperation with the valve plate, and the valve plate is pushed by the medium so that the second valve seat forms a second sealing cooperation with the valve body, the gate valve is sealed through the double sealing cooperation, and when the pressure in the middle cavity increases abnormally, the first valve seat is pushed open, thereby releasing the pressure in the middle cavity.

[0006] According to one aspect of the utility model, the inner sides of the first valve seat and the second valve seat are in contact with the contact surface of the valve plate.

[0007] According to one aspect of the present invention, the outer sides of the first valve seat and the second valve seat fit the contact surface of the valve body, and the elastic component abuts against the contact surface between the first valve seat and the valve body.

[0008] According to one aspect of the utility model, a valve stem is connected to the upper end of the valve plate, and a packing layer is provided between the valve stem and the valve body.

[0009] According to one aspect of the utility model, the packing layer includes a packing pad, a packing, and a packing pressing plate which are arranged in sequence from top to bottom.

[0010] According to one aspect of the utility model, the filler is a flexible graphite filler.

[0011] According to one aspect of the utility model, the contact surface of the valve plate with the valve seat is made of stainless steel and / or hard alloy.

[0012] The advantages of the implementation of the utility model are as follows: the first valve seat is pushed by the medium, so that the floating sealing device fits on the gate plate to form a first seal; the medium pushes the gate plate to form an outlet forced seal to form a second seal; the gate valve seal is made more reliable through the double seal form; the end of the first valve seat in contact with the valve body is provided with a floating sealing device which can also prevent the middle cavity from increasing pressure. When the middle cavity pressure increases abnormally and the middle cavity pressure is greater than the pipeline pressure, the middle cavity pressure can push the inlet floating valve seat back, so that the pressure can be discharged into the channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] 1. Valve body; 2. Valve cover; 3. Valve plate; 4. First valve seat; 5. Floating sealing device; 6. Channel; 7. Handwheel; 8. Valve stem; 9. Packing layer; 91. Packing pad; 92. Packing; 93. Packing pressure plate. DETAILED DESCRIPTION

[0016] 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 in 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.

[0017] Embodiment 1:

[0018] like Figure 1As shown, a new type of gate valve comprises a valve body 1 and a valve cover 2 covered on the valve body 1, the valve body 1 is provided with an inlet and an outlet, the valve body 1 is provided with a valve plate 3, the valve plate 3 is provided with a first valve seat 4 on the side close to the inlet, and the valve plate 3 is provided with a second valve seat on the side close to the outlet, and a floating sealing device 5 is provided at the end of the first valve seat 4 in contact with the valve body 1, the floating sealing device 5 comprises a groove arranged on the contact surface between the first valve seat 4 and the valve body 1 and an elastic component connected to the groove, the floating sealing device 5 is pushed to form a first sealing cooperation with the valve plate 3, the valve plate 3 is pushed by the medium so that the second valve seat forms a second sealing cooperation with the valve body 1, and the gate valve is sealed through the double sealing cooperation, and when the pressure in the middle cavity increases abnormally, the first valve seat 4 is pushed open, thereby releasing the pressure in the middle cavity. The first valve seat 4 is pushed by the medium, so that the floating sealing device fits on the gate plate to form the first seal; the medium pushes the gate plate to form an outlet forced seal to form a second seal; the double seal makes the gate valve seal more reliable; the end of the first valve seat 4 that contacts the valve body 1 is provided with a floating sealing device 5 which can also prevent the middle cavity from pressurizing. When the middle cavity pressure rises abnormally and the middle cavity pressure is greater than the pipeline pressure, the middle cavity pressure can push the inlet floating valve seat back, so that the pressure can be released.

[0019] This embodiment is preferably used for a wedge-type gate valve.

[0020] Among gate valves, wedge-type gate valves have the best sealing performance, because the valve plate 3 and valve seat of the opening and closing parts are both wedge-shaped. Under the thrust of the valve stem 8, the pressing force between the two is proportional to the thrust of the valve stem 8. Therefore, the specific pressure at the sealing surface of the valve plate 3 and the valve seat is very large, which is conducive to sealing. Wedge-type gate valves are commonly used, especially for high-pressure valves. To ensure sealing, the angle between the valve seats must be completely consistent with the angle between the gate plates. Otherwise, the sealing surface of the valve plate 3 and the valve seat is not completely in contact, which will cause leakage. Even if the sealing surface of a new valve is in contact, the angle changes after use and wear, which often causes leakage. Moreover, traditionally, the valve seat is embedded in the valve body 1 or welded to the valve body 1 to form a fixed sealing structure, which makes it difficult to ensure that the angle between the valve seats is completely consistent with the angle between the gate plates. In addition, the existing wedge-type gate valves are The pressure in the valve cavity is high, and maintenance is required frequently to prevent damage to components. Therefore, this embodiment uses the medium pressure to push the first valve seat 4, so that the first valve seat 4 provided with a floating sealing device 5 can maintain a close seal with the gate at any time, and push the second valve seat to seal with the valve body 1 to form multiple seals. Even if there are gaps between the gland and the valve seat, and between the valve body 1 and the valve seat after wear, they can be adjusted, effectively avoiding leakage and preventing the pressure in the cavity from rising. When the pressure in the cavity rises abnormally and is greater than the pipeline pressure, the pressure in the cavity can push the first valve seat at the inlet to the back to release the pressure.

[0021] In practical applications, a hand wheel 7 is provided at the top of the valve stem 8, and the valve plate 3 is raised and lowered by a screw rod. The hand wheel 7 controls the raising and lowering of the valve plate 3.

[0022] In practical applications, flanges are provided on both sides of the valve body 1. The flanges can be installed quickly and accurately.

[0023] In practical applications, the inner sides of the first valve seat 4 and the second valve seat fit with the contact surface of the valve plate 3. This makes the valve seat fit with the valve plate 3, improves the sealing performance, and reduces the leakage rate.

[0024] In practical applications, the outer sides of the first valve seat 4 and the second valve seat fit the contact surface of the valve body 1, and the elastic component abuts against the contact surface of the first valve seat 4 and the valve body 1. This facilitates the second valve seat to form a sealing fit with the valve body 1, improves the sealing performance, and effectively reduces the leakage rate.

[0025] In this embodiment, the elastic component is a spring.

[0026] In practical applications, the upper end of the valve plate 3 is connected with a valve stem 8, and a packing layer 9 is provided between the valve stem 8 and the valve body 1. The packing layer 9 enhances the anti-leakage function.

[0027] In practical applications, the packing layer 9 includes a packing pad 91 , a packing 92 , and a packing pressure plate 93 which are arranged in sequence from top to bottom.

[0028] In practical applications, the packing pressure plate 93 and the valve body 1 are fixed by fasteners for compression and fixation.

[0029] In practical applications, the filler 92 is a flexible graphite filler 92 .

[0030] In practical applications, the contact surface of the valve plate 3 with the valve seat is made of stainless steel and / or hard alloy.

[0031] In practical applications, a hand wheel 7 is provided at the top of the valve stem 8, and the valve plate 3 is raised and lowered by a screw rod. The hand wheel 7 controls the raising and lowering of the valve plate 3.

[0032] In practical applications, flanges are provided on both sides of the valve body 1. The flanges can be installed quickly and accurately.

Claims

1. A novel gate valve, comprising a valve body (1) and a valve cover (2) covered on the valve body (1), wherein the valve body (1) is provided with an inlet and an outlet, and a valve plate (3) is provided inside the valve body (1), characterized in that: A first valve seat (4) is provided on the side of the valve plate (3) close to the inlet, and a second valve seat is provided on the side of the valve plate (3) close to the outlet. A floating sealing device (5) is provided on the end of the first valve seat (4) in contact with the valve body (1). The floating sealing device (5) includes a groove provided on the contact surface between the first valve seat (4) and the valve body (1) and an elastic component connected to the groove. The floating sealing device (5) is pushed to form a first sealing fit with the valve plate (3). The valve plate (3) is pushed by the medium so that the second valve seat forms a second sealing fit with the valve body (1). The gate valve is sealed by the double sealing fit and when the pressure in the middle cavity increases abnormally, the first valve seat (4) is pushed open, thereby releasing the pressure in the middle cavity.

2. A new type of gate valve according to claim 1, characterized in that: The inner sides of the first valve seat (4) and the second valve seat are in contact with the contact surface of the valve plate (3).

3. A new type of gate valve according to claim 2, characterized in that: The outer sides of the first valve seat (4) and the second valve seat are in contact with the contact surface of the valve body (1), and the elastic component abuts against the contact surface of the first valve seat (4) and the valve body (1).

4. A new type of gate valve according to claim 1, characterized in that: The upper end of the valve plate (3) is connected to a valve stem (8), and a packing layer (9) is provided between the valve stem (8) and the valve body (1).

5. A new type of gate valve according to claim 1, characterized in that: It also comprises a packing layer (9), wherein the packing layer (9) comprises a packing pad (91), a packing (92), and a packing pressure plate (93) which are arranged in sequence from top to bottom.

6. A new type of gate valve according to claim 5, characterized in that: The filler (92) is a flexible graphite filler (92).

7. A new type of gate valve according to any one of claims 1 to 6, characterized in that: The contact surface of the valve plate (3) with the first valve seat or the second valve seat is made of stainless steel and / or hard alloy.

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