Flat gate valve with guiding function

Abstract

The utility model relates to the technical field of flat gate valves, in particular to a flat gate valve with a guiding function. Comprising a valve body, a gate plate arranged in the valve body, a valve rod arranged on the gate plate and valve seats arranged on the two sides of the gate plate and fixedly connected with the valve body, a guide plate is arranged below a flow guide hole in the gate plate, and the guide plate is fixedly connected with the gate plate; the boundary dimension of the guide plate is matched with the boundary dimension of the gate plate; one end of the guide plate is fixedly connected with the gate plate, and an opening of the other end of the guide plate faces downwards; the opening is in an arc shape and is larger than a semicircle in range. The flat gate valve with the guiding function has the advantages of being good in sealing performance, long in service life, good in stability and reliability, low in cost, convenient to maintain and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to flat gate valve technical field especially relates to a flat gate valve with guide. BACKGROUND

[0002] Z43 series parallel single gate plate gate valve (also known as flat gate valve) is one of important varieties of control valves in production process, and the flat gate valve has good opening and closing characteristics, and also has full bore, small flow resistance, good sealing, convenient opening and closing and other characteristics, and can be applied to product oil conveying pipeline and storage equipment, oil and gas exploitation inlet device and pipeline with suspended particles and fibers.

[0003] Chinese patent CN204239783U discloses a flat gate valve with guide plate, including valve body, valve stem, the valve body is equipped with inflow channel, outflow channel, the valve body is equipped with valve cavity, the inflow channel, outflow channel and valve cavity are communicated, the valve cavity is equipped with gate plate, the valve stem one end extends into the valve cavity and is linked with gate plate, the gate plate is equipped with valve seat between inflow channel and outflow channel, its characterized in that: the valve seat upper end on both sides of gate plate is equipped with guide plate for preventing gate plate from tilting when lifting, the utility model discloses a flat gate valve with guide plate, which can prevent the gate plate from tilting when lifting and avoid valve stem distortion, prolong the service life of valve.

[0004] But the technical scheme connects the guide plate with the valve seat together, which will cause the sealing surface between the valve seat and the gate plate to be unevenly stressed, thus leading to poor sealing effect, and the frequent friction between the gate valve and the guide plate will cause the wear of the gate plate and the guide plate, thus affecting the service life of the gate valve. Utility model content

[0005] The utility model discloses a flat gate valve with guide, which can provide accurate guidance for the lifting movement of the gate plate by directly installing the guide plate on the gate plate, ensure the stability of the gate plate during movement, and reduce the wear of the gate plate and the valve seat.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A flat gate valve with guide, comprising a valve body, a gate plate arranged inside the valve body, a valve stem arranged on the gate plate, and a valve seat arranged on both sides of the gate plate and fixedly connected with the valve body, a guide plate is arranged below the flow guide hole of the gate plate, and the guide plate is fixedly connected with the gate plate.

[0008] Preferably, the outer dimensions of the guide plate are adapted to the outer dimensions of the gate plate.

[0009] Preferably, one end of the guide plate is fixedly connected with the gate plate, and the opening at the other end is arranged downward.

[0010] Preferably, the opening is arc-shaped, and the range is greater than half a circle.

[0011] Preferably, an elastic member is arranged between one side of the valve seat and the valve body.

[0012] Preferably, a sealing member is arranged between the other side of the valve seat and the valve body.

[0013] Preferably, the valve rod is fixedly connected with the gate plate through a limiting block, and the limiting block is arranged above the valve seat.

[0014] Preferably, a stop block is arranged above the limiting block.

[0015] Preferably, a sealing assembly is arranged between the valve body and the valve rod.

[0016] Preferably, the sealing assembly comprises a gasket arranged on the outer periphery of the valve rod, a packing arranged on the adjacent side of the gasket, a packing spacer ring arranged in the middle of the packing, a packing pressing sleeve arranged on the adjacent side of the packing, a packing pressing plate arranged on the adjacent side of the packing pressing sleeve, a plurality of fasteners arranged on the packing pressing plate for fixing, and an automatic compensation member arranged between the fasteners and the packing pressing plate.

[0017] The utility model discloses the beneficial effect lies in:

[0018] (1) the utility model discloses a guide plate is installed below the flow guide hole, can provide accurate guide for the lifting movement of the gate plate, ensures that the gate plate keeps stable in the movement process, avoids the deviation, inclination or shaking of the gate plate in the lifting process and other problems, thereby improves the sealing performance and operation reliability of the gate valve, and in the lifting process of the gate plate, the guide plate can play a certain protection effect to the sealing surface of the valve seat, prevents the sealing surface from colliding or scraping, prolongs the service life of the whole gate valve.

[0019] (2) the utility model discloses that the guide plate is installed with the gate plate, can make the gate plate and the valve seat sealing surface more closely adhere, improves the sealing performance of the gate valve, ensures that the gate valve can effectively cut off fluid in the closed state, can also guarantee that the gate plate is more stable in the lifting process, reduces the shaking or jamming phenomenon caused by the size mismatch, improves the overall stability and reliability of the gate valve.

[0020] (3) This utility model uses a floating pressure self-pre-tightening structure to install the valve seat. Under the action of the spring, the valve seat is pushed to press against the gate to achieve sealing. When the valve cavity is abnormally pressurized, the valve seat moves to automatically release pressure. The gate is provided with a guide tail wing. When the valve is fully opened, the gate guide tail wing can support the left and right valve seats to prevent tilting, ensuring that the gate can open and close freely without jamming. At the same time, the valve body is provided with guide ribs, and the gate swings small, so that the gate always moves along the guide ribs during operation, minimizing the influence of the medium pressure on the gate and preventing the valve stem from separating from the gate.

[0021] (4) By setting the opening of the guide plate to be arc-shaped and its range is greater than a semicircle, this utility model is conducive to the fluid being discharged from below the gate when the valve is closed, reducing the accumulation of fluid between the gate and the valve seat, thereby reducing the risk of damage to the sealing surface caused by fluid accumulation. It can also increase the contact area between the guide plate and the gate, further improving the stability and reliability of the guide. It can also better adapt to the fluid flow under different working conditions, reduce the impact of fluid on the gate and guide plate, and improve the service life of the gate valve.

[0022] (5) By installing the flat gate valve with flow guide hole on the pipeline, the present invention allows the use of a pipeline cleaning tool to perform pipeline cleaning operations, which facilitates pipeline maintenance and cleaning and has low operating costs.

[0023] In summary, this utility model has the advantages of good sealing performance, long service life, good stability and reliability, low cost and convenient maintenance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the gate of this utility model;

[0025] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 3 for Figure 2 Enlarged view of point A;

[0027] Figure 4 for Figure 2 Enlarged view of point B;

[0028] Figure 5 for Figure 2 Enlarged view of point C. Detailed Implementation

[0029] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0030] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0031] Embodiment

[0032] As Figures 1-5 shown, the embodiment provides a flat plate gate valve with guide, specifically adopts parallel single gate plate structure, which comprises a valve body 1, a gate plate 2 arranged in the valve body 1, a valve rod 3 arranged on the gate plate 2 and two valve seats 4 arranged on both sides of the gate plate 2 and fixedly connected with the valve body 1, a guide plate 22 is arranged below the flow guide hole 21 on the gate plate 2, the guide plate 22 is fixedly connected with the gate plate 2, both of which can be integrally formed or combined structure, the flow guide hole 21 enables the fluid to pass more smoothly when the gate valve is opened, reduces the resistance of the fluid at the gate plate 2, and improves the flow efficiency of the fluid, the two valve seats 4 are floating type, have the characteristics of soft and hard sealing, and have long service life.

[0033] The guide plate 22 can provide accurate guidance for the lifting movement of the gate plate 2, ensure that the gate plate 2 remains stable during movement, avoid the problems of deviation, inclination or shaking of the gate plate 2 during lifting, thereby improve the sealing performance and operation reliability of the gate valve, and the guide plate 22 can protect the sealing surface of the valve seat 4 during the lifting of the gate plate 2, prevent the sealing surface from being collided or scraped, and prolong the service life of the entire gate valve.

[0034] Meanwhile, the flat gate valve with the flow guide hole 21 can be directly used for pigging operation when installed on the pipeline, and can also be blown with a wool ball, which facilitates the maintenance and cleaning of the pipeline, has low use cost, and can be installed on horizontal or vertical pipelines. Before use, the pipeline and compressed air pipeline should be blown to thoroughly clean the pipeline and valve of impurities such as welding slag, lubricating grease and other impurities. For valves with a nominal diameter DN≥250, it is recommended to add elastic support or suspension device to prevent the actuator from being too heavy and affecting the normal operation of the gate valve.

[0035] In the embodiment, the outer size of the guide plate 22 is matched with the outer size of the gate plate 2, which can make the gate plate 2 and the sealing surface of the valve seat 4 more closely fit, improve the sealing performance of the gate valve, ensure that the gate valve can effectively cut off the fluid in the closed state, and also ensure that the gate plate 2 is more stable during lifting, reduces the shaking or jamming phenomenon caused by size mismatch, and improves the overall stability and reliability of the gate valve.

[0036] In the embodiment, one end of the guide plate 22 is fixedly connected with the gate plate 2, so that the guide plate 22 can effectively guide the movement of the gate plate 2 and ensure the movement accuracy of the gate plate 2. The opening 23 at the other end of the guide plate 22 is arranged downward, which is beneficial to the discharge of fluid from below the gate plate 2 when the valve is closed, reduces the accumulation of fluid between the gate plate 2 and the valve seat 4, and thus reduces the risk of damage to the sealing surface caused by fluid accumulation.

[0037] In the embodiment, the opening 23 is arc-shaped and has a range greater than a semicircle, which can increase the contact area between the guide plate 22 and the gate plate 2, further improve the stability and reliability of the guide, and also better adapt to the fluid flow under different working conditions, reduce the impact of fluid on the gate plate 2 and the guide plate 22, and improve the service life of the gate valve.

[0038] In the embodiment, the elastic member 41, which can be preferably a cylindrical spring, is arranged between one side of the valve seat 4 and the valve body 1, and can compensate for the difference in thermal expansion between the valve body 1 and the valve seat 4 due to temperature changes, prevent damage to the sealing surface or jamming of the valve due to thermal expansion, and keep the valve seat 4 and the sealing surface of the gate plate 2 in close contact, i.e., the valve seat 4 is a floating pressure self-preloading structure, which pushes the valve seat 4 to tightly adhere to the gate plate 2 to achieve sealing under the action of the spring force; when the pressure in the valve cavity abnormally rises, the valve seat 4 moves to automatically release pressure; the gate plate 2 is provided with a guide tail wing, which can support the left and right valve seats 4 from tilting when the valve is fully opened, ensuring that the gate plate 2 can be opened and closed freely without jamming; at the same time, the valve body 1 is provided with a guide rib, and the gate plate 2 swings slightly, so that the gate plate 2 always moves along the guide rib during operation, maximally reduces the influence of medium pressure on the gate plate 2, and prevents the valve stem 3 and the gate plate 2 from being separated, thereby enhancing the sealing performance of the entire gate valve.

[0039] In the embodiment, the sealing member 42, which can be preferably an O-ring, is arranged between the other side of the valve seat 4 and the valve body 1, and can effectively prevent fluid from leaking from the gap between the valve seat 4 and the valve body 1, ensure the sealing performance of the valve, and improve the reliability and safety of the valve.

[0040] In the embodiment, the valve stem 3 and the gate plate 2 are fixedly connected through the limiting block 31, which is arranged above the valve seat 4, to avoid the guide plate 22 from colliding with the valve body 1 due to excessive lowering of the valve stem 3, and to protect the normal operation of the gate valve.

[0041] In the embodiment, the limiting block 31 is provided with the stop block 32 above, which can prevent the limiting block 31 from shifting or loosening during operation, ensure the fixing effect of the limiting block 31, and thus ensure the accuracy of the position of the gate plate 2 and the sealing performance of the gate valve, and also avoid the valve stem 3 from being separated from the valve body 1 due to excessive rising of the valve stem 3.

[0042] In the embodiment, the sealing assembly 5 is arranged between the valve body 1 and the valve stem 3, and comprises a gasket 51 arranged on the outer periphery of the valve stem 3, a packing 52 arranged on the adjacent side of the gasket 51, a packing spacer ring 53 arranged in the middle of the packing 52, a packing pressing sleeve 54 arranged on the adjacent side of the packing 52, a packing pressing plate 55 arranged on the adjacent side of the packing pressing sleeve 54, a plurality of fasteners 56 arranged on the packing pressing plate 55 for fixing, and an automatic compensation member 57 arranged between the fasteners 56 and the packing pressing plate 55, so as to form multiple seals, effectively prevent fluid from leaking from the gap between the valve stem 3 and the valve body 1, and the automatic compensation member 57 can automatically adjust the sealing force of the sealing assembly 5, compensate the sealing gap caused by wear or temperature change, ensure the long-term stability of the sealing performance, and the automatic compensation member 57 can be preferably a disc spring.

[0043] In the embodiment, the packing 52 is preferably two groups of V-shaped self-sealing shaped packings 52, and a soft injection packing 52 is arranged in the middle, if a user needs to use pure metal sealing, STL or nickel-based hard alloy is usually used for surfacing on the sealing surface of the valve seat 4, and the gate plate 2 is entirely sprayed with STL or nickel-based hard alloy, the two are ground against each other to achieve the sealing effect, the valve seat 4 can be formed by split type combination, is suitable for high temperature and contains particle, fiber, corrosive medium working condition, and is provided with fireproof and anti-static device, and the service life of the gate valve is ensured.

[0044] Of course, the guide plate 22 is arranged opposite to the blowdown valve 6 at the bottom of the valve body 1, when the blowdown operation of the gate valve is needed, the fluid can directly flow to the blowdown valve 6 through the opening 23 below the guide plate 22, the impurities and dirt in the gate valve can be conveniently discharged, the inside of the gate valve is kept clean, the maintenance efficiency of the gate valve is improved, and the cost is reduced.

[0045] In addition, the grease injection valve 7 is arranged at one end of the valve body 1 close to the valve stem 3, the grease injection valve 7 can inject lubricating grease between the valve stem 3 and the valve body 1, the lubricating grease can reduce the friction between the valve stem 3 and the packing 52, improve the operation flexibility of the gate valve, the lubricating grease can also fill the small gap in the sealing assembly 5, further enhance the sealing performance of the gate valve, prevent fluid leakage, and the lubricating grease can form a protective film on the surface of the valve stem 3 and the packing 52, prevent the corrosion of the fluid to the valve stem 3 and the packing 52, and prolong the service life of the gate valve.

[0046] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A guided flat gate valve, comprising: The valve body, the shutter plate arranged inside the valve body, the valve rod arranged on the shutter plate, and the valve seat arranged on both sides of the shutter plate and fixedly connected with the valve body are characterized in that a guide plate is arranged below the flow guide hole on the shutter plate.

2. A guided flat gate valve according to claim 1, characterized in that The outer size of the guide plate is matched with the outer size of the shutter plate.

3. A guided flat gate valve according to claim 1, characterized in that One end of the guide plate is fixedly connected with the shutter plate, and the opening of the other end is arranged downward.

4. A flat gate valve with a guide according to claim 3, characterized in that, The opening is arc-shaped, and the range thereof is greater than half a circle.

5. A guided flat gate valve according to claim 1, characterized in that An elastic member is arranged between one side of the valve seat and the valve body.

6. A flat gate valve with a guide according to claim 5, characterized in that A sealing member is arranged between the other side of the valve seat and the valve body.

7. A flat gate valve with a guide according to claim 1, characterized in that, The valve rod is fixedly connected with the shutter plate through a limiting block, and the limiting block is arranged above the valve seat.

8. A flat gate valve with a guide according to claim 7, characterized in that A stop block is arranged above the limiting block.

9. A guided flat gate valve according to claim 1, characterized in that A sealing assembly is arranged between the valve body and the valve rod.

10. A flat gate valve with a guide according to claim 9, characterized in that The sealing assembly comprises a gasket arranged on the outer periphery of the valve rod, a packing arranged on the adjacent side of the gasket, a packing spacer ring arranged in the middle of the packing, a packing pressing sleeve arranged on the adjacent side of the packing, a packing pressing plate arranged on the adjacent side of the packing pressing sleeve, a plurality of fasteners arranged on the packing pressing plate for fixing, and an automatic compensation member arranged between the fasteners and the packing pressing plate.

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