Stop valve

Abstract

The utility model relates to the related technical field of stop valves, in particular to a stop valve which comprises a valve body, and a valve element is installed in the valve body. According to the stop valve, through arrangement of all parts, during operation, the hand wheel is rotated, the valve rod is driven to move in the axial direction, movement of the valve rod directly acts on the valve element, circulation of media is controlled by lifting or closing the valve element, the corrugated pipe is driven by the valve rod and the valve element to correspondingly stretch out and draw back along with opening and closing of the valve element, and therefore sealing is kept; in addition, the packing is arranged on the inner wall of the valve cover and used for further sealing a gap between the valve rod and the valve cover so as to enhance the sealing performance, the gland is used for pressing the packing so that the packing can be kept in a proper compression state, and therefore medium leakage is effectively prevented. The device can be used in strong acid, strong alkali and other corrosive medium environments.

Description

TECHNICAL FIELD

[0001] The utility model relates to the related technical field of stop valve especially, it relates to stop valve. BACKGROUND

[0002] The stop valve is a kind of forced sealing type valve, its structural characteristics make it applicable to the occasion needing frequent opening and closing, by rotating hand wheel and driving the up-and-down movement of valve stem, the opening and closing of valve clapper are controlled, the fluid is cut off or regulated.It is usually used for the flow regulation or cut-off control of medium in pipeline, since valve clapper and valve seat form tight contact when closing, it has good sealing property, can effectively prevent medium leakage, stop valve simple structure, easy operation, reliable sealing, widely used in pipeline control system in petroleum, chemical industry, electric power and other industries, with the continuous development of science and technology, the requirement of stop valve is also higher and higher, therefore, it is particularly needed to stop valve.

[0003] But the existing stop valve, most of the size of component is arbitrary, and usually for cost saving, the use material and sealing property of each component are poor, not only not conducive to mass production, and when using, the use effect is poor, greatly shortens the service life of each component. UTILITY MODEL CONTENT

[0004] The utility model discloses a stop valve to solve the problem that the existing stop valve is arbitrary in the size of component, and usually for cost saving, the use material and sealing property of each component are poor, not only not conducive to mass production, and when using, the use effect is poor, greatly shortens the service life of each component.

[0005] To realize the above-mentioned purpose, the utility model provides the following technical scheme: stop valve, including valve body, valve core, bellows, valve cover, packing, gland, valve rod and hand wheel, the L of valve body is 230 millimeter, the D of valve body is 165 millimeter, the DN of valve body is 50 millimeter, the material of valve body is set as WCB+F46, the inside of valve body is installed with valve core, the inside of valve body is connected with bellows, one side of bellows is connected with valve core, the other side of bellows is connected with valve cover, the material of bellows is set as PTFE, one side of valve body is connected with valve cover with screw thread, the inner wall of valve cover is filled with packing, the material of valve cover is WCB+F46, the material of packing is also PTFE, the other side of valve cover is connected with gland with screw thread, one side of gland is installed with valve rod, the other end of valve rod is fixedly connected with hand wheel, the material of hand wheel is KTH330-08, the medium of valve body is strong acid, strong alkali type medium.

[0006] Preferably, K of the valve body is 125 millimeters, d of the valve body is 97 millimeters, and n-Ød1 of the valve body is 4-Ø18 millimeters.

[0007] Preferably, C of the valve body is 16 millimeters, and f of the valve body is 3 millimeters.

[0008] Preferably, the material of the gland is WCB, and the material of the valve stem is CS.

[0009] Compared with the prior art, the beneficial effects of the utility model are that: the stop valve, through the setting of various parts, the valve core, the valve seat and the corrugated pipe and other components cooperate with each other, ensure the high sealing property of the stop valve in the closed state, effectively prevent the medium leakage, the packing, the gland and other components further strengthen the sealing, guarantee the sealing effect between the valve stem and the valve cover, at the same time, select the material (such as PTFE and F46) with corrosion resistance for the key components in contact with the medium, especially in the strong acid, strong alkali and other corrosive media, improve the durability of the stop valve, prolong the service life of the equipment, through the coordination of various parts, the stop valve can efficiently and stably realize the control and sealing of fluid, meet the use requirement under the harsh working condition. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is the sectional structure schematic diagram of the utility model stop valve;

[0011] Fig. 2 is the part size marking schematic diagram of the utility model stop valve;

[0012] Fig. 3 is the part material marking schematic table of the utility model stop valve;

[0013] Fig. 4 is the connection size marking schematic table of the utility model stop valve;

[0014] Fig. 5 is the performance specification table of the utility model stop valve.

[0015] Fig. 1 is the sectional structure schematic diagram of the utility model stop valve; DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0017] Please refer to Figures 1-5, the utility model provides a technical scheme: stop valve, including valve body 1, valve core 2, bellows 3, valve cover 4, packing 5, gland 6, valve rod 7 and hand wheel 8, the inside installation of valve body 1 has valve core 2, the inside connection of valve body 1 has bellows 3, the side screw connection of valve body 1 has valve cover 4, the inner wall of valve cover 4 is filled with packing 5, the other side screw connection of valve cover 4 has gland 6, the side installation of gland 6 has valve rod 7, the other end fixed connection of valve rod 7 has hand wheel 8, through including valve body 1, valve core 2, bellows 3, valve cover 4, packing 5, gland 6, valve rod 7 and hand wheel 8 The setting, the main components of valve include valve body 1, valve core 2, bellows 3, valve cover 4, packing 5, gland 6, valve rod 7 and hand wheel 8. The inside installation of valve body 1 has valve core 2, for adjusting the flow of fluid, bellows 3 is connected between valve body 1 and valve cover 4, and is connected with valve core 2, and its material is PTFE (polytetrafluoroethylene), has excellent corrosion resistance, is suitable for the application of strong acid and strong alkali medium, valve cover 4 and gland 6 are fixed by screw connection, form sealed structure, when operating, by rotating hand wheel 8, drive valve rod 7 axial movement, the movement of valve rod 7 directly acts on valve core 2, by lifting or closing valve core 2 to control the circulation of medium, bellows 3 is driven under the valve rod 7 and valve core 2, with the opening and closing of valve core 2 and the corresponding expansion and contraction movement of valve core 2, to keep sealed, and avoid the internal leakage of valve, in addition, packing 5 is arranged in the inner wall of valve cover 4, for further sealing the gap between valve rod 7 and valve cover 4, to enhance the sealing performance, gland 6 is used for pressing packing 5, so that it keeps in the appropriate compression state, thereby effectively preventing medium leakage, since the corrosion resistance of the components of the valve is selected, it is used in strong acid, strong alkali and other corrosive medium environment.

[0018] Further, one side of the bellows 3 is connected with the valve core 2, the other side of the bellows 3 is connected with the valve cover 4, the material of the bellows 3 is set to PTFE, through the setting of the bellows 3, the bellows 3 is connected between the valve core 2 and the valve cover 4, forming a sealed barrier to prevent the medium from leaking outward through the valve stem 7, especially in strong acid, strong alkali and other corrosive media, the sealing effect of the bellows 3 can effectively isolate the medium and prevent it from corroding the valve body 1 and the surrounding environment, at the same time, the bellows 3 has good flexibility and elasticity, and can freely stretch and contract with the up and down movement of the valve stem 7, so that there is no rigid contact during the opening or closing of the valve core 2, avoiding the leakage caused by wear or mechanical stress of the sealing parts and contact surfaces inside the valve, at the same time, the bellows 3 is made of PTFE (polytetrafluoroethylene), which has strong corrosion resistance and is suitable for contact with strong acid, strong alkali and other media, compared with the traditional packing 5 sealing structure, the bellows 3 sealing structure is more reliable in blocking medium leakage, ensuring the safe operation of the valve in a high corrosion environment, since the bellows 3 can effectively prevent the medium from directly contacting the valve stem 7, packing 5 and other components, thus reducing the corrosion damage of the medium to these components and prolonging the service life of the valve as a whole.

[0019] Further, the L of the valve body 1 is 230 millimeters, the D of the valve body 1 is 165 millimeters, the DN of the valve body 1 is 50 millimeters, and the material of the valve body 1 is set to WCB+F46, through the setting of the valve body 1, the length of the valve body 1 is 230 millimeters, making the valve compact in structure and convenient to install and maintain, this length ensures that the space inside the valve body 1 is sufficient to accommodate the valve core 2, bellows 3 and other key components, and will not affect the operation convenience and structural stability due to being too long or too short, DN=50 millimeters represents the nominal diameter of the valve body 1, this size determines the flow capacity of the valve, DN=50 millimeters of diameter is suitable for specific flow requirements, so that the valve can maintain good flowability and will not occupy too much pipeline space, at the same time, D=165 millimeters, the outer diameter of the flange is 165 millimeters, ensuring that the valve can be accurately matched with the pipeline flange during installation, thereby enhancing the stability and sealing performance of the connection, carbon steel has high strength and toughness, can withstand high pressure, and ensures the mechanical strength and durability of the valve body 1, F46 (fluoroplastic lining), lining F46 in the valve body 1 enhances the corrosion resistance of the valve, which is suitable for strong acid, strong alkali and other corrosive media, the fluoroplastic lining can effectively resist chemical corrosion, ensuring the safe application of the valve body 1 in high corrosive media.

[0020] Further, the K of the valve body 1 is 125 mm, the d of the valve body 1 is 97 mm, and the n-Ød1 of the valve body 1 is 4-Ø18 mm. Through the setting of the valve body 1, K=125 mm and d=97 mm: this is the bolt center distance and the inner diameter of the flange, which conforms to the standard flange connection size, ensuring that the valve can be conveniently installed and replaced in different pipeline systems, improving the compatibility of the system, and n-Ød1=4-818 mm: this is the number and hole diameter specification of the flange connection hole, designed as 4 bolt holes with a diameter of 18 mm, making the valve body more firmly connected with the pipeline, and an appropriate number of bolt hole diameters helps to evenly distribute pressure and improve impact and vibration resistance.

[0021] Further, the C of the valve body 1 is 16 mm, and the f of the valve body 1 is 3 mm. Through the setting of the valve body 1, C=16 mm and f=3 mm: this is the design of the flange thickness and boss height, which is sufficient to ensure the sealing performance between the valve body and the pipeline, and at the same time, it is not easy to deform under high pressure, thereby improving the overall safety and durability.

[0022] Further, the material of the valve cover 4 is WCB+F46, and the material of the packing 5 is also PTFE. Through the setting of the valve cover 4 and the packing 5, carbon steel provides the necessary strength to ensure that the valve cover 4 can withstand pressure from the outside, F46 (fluoroplastic lining), the valve cover 4 is lined with F46 to improve its corrosion resistance and avoid damage when in contact with strong acid, strong alkali, and other corrosive media, prolonging the service life of the valve cover 4. At the same time, PTFE (polytetrafluoroethylene), the packing 5 uses PTFE material, which not only has excellent corrosion resistance but also has good lubricity, reducing friction when the valve stem 7 moves. The PTFE packing 5 can also maintain stable sealing performance under high and low temperature conditions, ensuring the sealing effect between the valve stem 7 and the valve cover 4 and preventing leakage.

[0023] Further, the material of the gland 6 is WCB, and the material of the valve stem 7 is CS. Through the setting of the gland 6 and the valve stem 7, the carbon steel gland 6 can provide sufficient strength and wear resistance for fixing the packing 5 and maintaining its compressed state. Since the gland 6 does not directly contact the medium, WCB can meet the mechanical strength requirements and is relatively low in cost. CS (carbon steel) The valve stem 7 is made of carbon steel, which has good strength, wear resistance, and toughness, can withstand the force exerted by the hand wheel 8, and can long-term and stably control the opening and closing of the valve core 2. Carbon steel is economical and reliable without directly contacting the medium.

[0024] Furthermore, the handwheel 8 is made of KTH330-08, and the valve body 1 is suitable for strong acid and strong alkali media. Through the setting of the handwheel 8, KTH330-08 material is usually used to manufacture handwheels 8 with high impact resistance and wear resistance, which is suitable for frequent operation. The handwheel 8 is made of KTH330-08 material, which can maintain durability and stable operation feel in harsh environments.

[0025] Working principle: The main components of the valve include valve body 1, valve core 2, bellows 3, valve cover 4, packing 5, gland 6, valve stem 7, and handwheel 8. The valve body 1 houses the valve core 2, used to regulate fluid flow. A bellows 3 connects the valve body 1 and the valve cover 4, and is connected to the valve core 2. Made of PTFE (polytetrafluoroethylene), it has excellent corrosion resistance and is suitable for applications with strong acids and alkalis. The valve cover 4 and the gland 6 are fixed by a threaded connection, forming a sealing structure. During operation, rotating the handwheel 8 drives the valve stem 7 to move axially. The movement of the valve stem 7 directly acts on the valve core 2, controlling the flow of the medium by raising or closing the valve core 2. Driven by the valve stem 7 and the valve core 2, the bellows 3 expands and contracts accordingly with the opening and closing of the valve core 2, maintaining a seal and preventing internal leakage. Furthermore, packing 5 is placed on the inner wall of the valve cover 4 to further seal the gap between the valve stem 7 and the valve cover 4, enhancing sealing performance. The gland 6... Used to compress the packing 5 to keep it in a proper compressed state, thereby effectively preventing media leakage. Since all components of this valve are made of corrosion-resistant materials, it can be used in corrosive media environments such as strong acids and strong alkalis.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gate valve, comprising a valve body (1), a valve core (2), a bellows (3), a valve cover (4), packing (5), a gland (6), a valve stem (7), and a handwheel (8), characterized in that: The valve body (1) has a length L of 230 mm, a diameter D of 165 mm, and a diameter DN of 165 mm. The valve body (1) is 50 mm thick and is made of WCB+F46. A valve core (2) is installed inside the valve body (1). A bellows (3) is connected inside the valve body (1). One side of the bellows (3) is connected to the valve core (2). The other side of the bellows (3) is connected to the valve cover (4). The bellows (3) is made of PTFE. The valve cover (4) is threaded to one side of the valve body (1). The inner wall of the valve cover (4) is filled with packing (5). The valve cover (4) is made of WCB+F46. The packing (5) is also made of PTFE. The other side of the valve cover (4) is threaded to the gland (6). A valve stem (7) is installed on one side of the gland (6). A handwheel (8) is fixedly connected to the other end of the valve stem (7). The handwheel (8) is made of KTH330-08. The valve body (1) is suitable for strong acid and strong alkali media.

2. The shut-off valve according to claim 1, characterized in that: The valve body (1) has a K of 125 mm, a d of 97 mm, and an n-Ød1 of 4-Ø18 mm.

3. The shut-off valve according to claim 1, characterized in that: The valve body (1) has a C of 16 mm and a f of 3 mm.

4. The shut-off valve according to claim 1, characterized in that: The material of the gland (6) is WCB, and the material of the valve stem (7) is CS.

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